The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces as well. ABSORPTION into the substance may follow but not necessarily.
Characteristics or attributes of the outer boundaries of objects, including molecules.
A colloidal, hydrated aluminum silicate that swells 12 times its dry size when added to water.
Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid.
The force acting on the surface of a liquid, tending to minimize the area of the surface. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Any of the numerous types of clay which contain varying proportions of Al2O3 and SiO2. They are made synthetically by heating aluminum fluoride at 1000-2000 degrees C with silica and water vapor. (From Hawley's Condensed Chemical Dictionary, 11th ed)
Polymerized forms of styrene used as a biocompatible material, especially in dentistry. They are thermoplastic and are used as insulators, for injection molding and casting, as sheets, plates, rods, rigid forms and beads.
An amorphous form of carbon prepared from the incomplete combustion of animal or vegetable matter, e.g., wood. The activated form of charcoal is used in the treatment of poisoning. (Grant & Hackh's Chemical Dictionary, 5th ed)
Agents that modify interfacial tension of water; usually substances that have one lipophilic and one hydrophilic group in the molecule; includes soaps, detergents, emulsifiers, dispersing and wetting agents, and several groups of antiseptics.
A group of compounds with the general formula M10(PO4)6(OH)2, where M is barium, strontium, or calcium. The compounds are the principal mineral in phosphorite deposits, biological tissue, human bones, and teeth. They are also used as an anticaking agent and polymer catalysts. (Grant & Hackh's Chemical Dictionary, 5th ed)
Hard, amorphous, brittle, inorganic, usually transparent, polymerous silicate of basic oxides, usually potassium or sodium. It is used in the form of hard sheets, vessels, tubing, fibers, ceramics, beads, etc.
Artificially produced membranes, such as semipermeable membranes used in artificial kidney dialysis (RENAL DIALYSIS), monomolecular and bimolecular membranes used as models to simulate biological CELL MEMBRANES. These membranes are also used in the process of GUIDED TISSUE REGENERATION.
Viruses whose hosts are bacterial cells.
Process by which unwanted microbial, plant or animal materials or organisms accumulate on man-made surfaces.
The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The mixture of gases present in the earth's atmosphere consisting of oxygen, nitrogen, carbon dioxide, and small amounts of other gases.
A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The homogeneous mixtures formed by the mixing of a solid, liquid, or gaseous substance (solute) with a liquid (the solvent), from which the dissolved substances can be recovered by physical processes. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Serum albumin from cows, commonly used in in vitro biological studies. (From Stedman, 25th ed)
The thermodynamic interaction between a substance and WATER.
The rate dynamics in chemical or physical systems.
Condition of having pores or open spaces. This often refers to bones, bone implants, or bone cements, but can refer to the porous state of any solid substance.
Two-phase systems in which one is uniformly dispersed in another as particles small enough so they cannot be filtered or will not settle out. The dispersing or continuous phase or medium envelops the particles of the discontinuous phase. All three states of matter can form colloids among each other.
Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS).
Any of several processes in which undesirable impurities in water are removed or neutralized; for example, chlorination, filtration, primary treatment, ion exchange, and distillation. It includes treatment of WASTE WATER to provide potable and hygienic water in a controlled or closed environment as well as provision of public drinking water supplies.
The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.
Zeolites. A group of crystalline, hydrated alkali-aluminum silicates. They occur naturally in sedimentary and volcanic rocks, altered basalts, ores, and clay deposits. Some 40 known zeolite minerals and a great number of synthetic zeolites are available commercially. (From Merck Index, 11th ed)
A yellow metallic element with the atomic symbol Au, atomic number 79, and atomic weight 197. It is used in jewelry, goldplating of other metals, as currency, and in dental restoration. Many of its clinical applications, such as ANTIRHEUMATIC AGENTS, are in the form of its salts.
A rigorously mathematical analysis of energy relationships (heat, work, temperature, and equilibrium). It describes systems whose states are determined by thermal parameters, such as temperature, in addition to mechanical and electromagnetic parameters. (From Hawley's Condensed Chemical Dictionary, 12th ed)
The most common mineral of a group of hydrated aluminum silicates, approximately H2Al2Si2O8-H2O. It is prepared for pharmaceutical and medicinal purposes by levigating with water to remove sand, etc. (From Merck Index, 11th ed) The name is derived from Kao-ling (Chinese: "high ridge"), the original site. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Biocompatible materials usually used in dental and bone implants that enhance biologic fixation, thereby increasing the bond strength between the coated material and bone, and minimize possible biological effects that may result from the implant itself.
A polysaccharide with glucose units linked as in CELLOBIOSE. It is the chief constituent of plant fibers, cotton being the purest natural form of the substance. As a raw material, it forms the basis for many derivatives used in chromatography, ion exchange materials, explosives manufacturing, and pharmaceutical preparations.
Theoretical representations that simulate the behavior or activity of chemical processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.
A type of scanning probe microscopy in which a probe systematically rides across the surface of a sample being scanned in a raster pattern. The vertical position is recorded as a spring attached to the probe rises and falls in response to peaks and valleys on the surface. These deflections produce a topographic map of the sample.
The use of a quartz crystal microbalance for measuring weights and forces in the micro- to nanogram range. It is used to study the chemical and mechanical properties of thin layers, such as polymer coatings and lipid membranes; and interactions between molecues.
A non-crystalline form of silicon oxide that has absorptive properties. It is commonly used as a desiccating agent and as a stationary phase for CHROMATOGRAPHY. The fully hydrated form of silica gel has distinct properties and is referred to as SILICIC ACID.
Deacetylated CHITIN, a linear polysaccharide of deacetylated beta-1,4-D-glucosamine. It is used in HYDROGEL and to treat WOUNDS.
Cetyltrimethylammonium compounds that have cationic detergent, antiseptic, and disinfectant activities. They are used in pharmaceuticals, foods, and cosmetics as preservatives; on skin, mucous membranes, etc., as antiseptics or cleansers, and also as emulsifiers. These compounds are toxic when used orally due to neuromuscular blockade.
The study of the energy of electrons ejected from matter by the photoelectric effect, i.e., as a direct result of absorption of energy from electromagnetic radiation. As the energies of the electrons are characteristic of a specific element, the measurement of the energy of these electrons is a technique used to determine the chemical composition of surfaces.
Enzymes which are immobilized on or in a variety of water-soluble or water-insoluble matrices with little or no loss of their catalytic activity. Since they can be reused continuously, immobilized enzymes have found wide application in the industrial, medical and research fields.
The mineral component of bones and teeth; it has been used therapeutically as a prosthetic aid and in the prevention and treatment of osteoporosis.
Quartz (SiO2). A glassy or crystalline form of silicon dioxide. Many colored varieties are semiprecious stones. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Specific molecular components of the cell capable of recognizing and interacting with a virus, and which, after binding it, are capable of generating some signal that initiates the chain of events leading to the biological response.
A genus of gram-positive, rod-shaped bacteria whose organisms are nonmotile. Filaments that may be present in certain species are either straight or wavy and may have swollen or clubbed heads.
Substances and drugs that lower the SURFACE TENSION of the mucoid layer lining the PULMONARY ALVEOLI.
Polymers of ETHYLENE OXIDE and water, and their ethers. They vary in consistency from liquid to solid depending on the molecular weight indicated by a number following the name. They are used as SURFACTANTS, dispersing agents, solvents, ointment and suppository bases, vehicles, and tablet excipients. Some specific groups are NONOXYNOLS, OCTOXYNOLS, and POLOXAMERS.
A compound with many biomedical applications: as a gastric antacid, an antiperspirant, in dentifrices, as an emulsifier, as an adjuvant in bacterins and vaccines, in water purification, etc.
The study of chemical changes resulting from electrical action and electrical activity resulting from chemical changes.
A membrane or barrier with micrometer sized pores used for separation purification processes.
The accumulation of an electric charge on a object
An anionic compound that is used as a reagent for determination of potassium, ammonium, rubidium, and cesium ions. It also uncouples oxidative phosphorylation and forms complexes with biological materials, and is used in biological assays.
Compounds similar to hydrocarbons in which a tetravalent silicon atom replaces the carbon atom. They are very reactive, ignite in air, and form useful derivatives.
An allotropic form of carbon that is used in pencils, as a lubricant, and in matches and explosives. It is obtained by mining and its dust can cause lung irritation.
Synthetic or natural materials, other than DRUGS, that are used to replace or repair any body TISSUES or bodily function.
Method for measuring viral infectivity and multiplication in CULTURED CELLS. Clear lysed areas or plaques develop as the VIRAL PARTICLES are released from the infected cells during incubation. With some VIRUSES, the cells are killed by a cytopathic effect; with others, the infected cells are not killed but can be detected by their hemadsorptive ability. Sometimes the plaque cells contain VIRAL ANTIGENS which can be measured by IMMUNOFLUORESCENCE.
A basic enzyme that is present in saliva, tears, egg white, and many animal fluids. It functions as an antibacterial agent. The enzyme catalyzes the hydrolysis of 1,4-beta-linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues in peptidoglycan and between N-acetyl-D-glucosamine residues in chitodextrin. EC
A spectroscopic technique in which a range of wavelengths is presented simultaneously with an interferometer and the spectrum is mathematically derived from the pattern thus obtained.
Layers of lipid molecules which are two molecules thick. Bilayer systems are frequently studied as models of biological membranes.
A chemical system that functions to control the levels of specific ions in solution. When the level of hydrogen ion in solution is controlled the system is called a pH buffer.
Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water.
Refuse liquid or waste matter carried off by sewers.
Polymers of high molecular weight which at some stage are capable of being molded and then harden to form useful components.
Extracorporeal ULTRAFILTRATION technique without HEMODIALYSIS for treatment of fluid overload and electrolyte disturbances affecting renal, cardiac, or pulmonary function.
An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.
Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to a choline moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and choline and 2 moles of fatty acids.
A form of SILICON DIOXIDE composed of skeletons of prehistoric aquatic plants which is used for its ABSORPTION quality, taking up 1.5-4 times its weight in water. The microscopic sharp edges are useful for insect control but can also be an inhalation hazard. It has been used in baked goods and animal feed. Kieselguhr is German for flint + earthy sediment.

Characterization of human bactericidal antibodies to Bordetella pertussis. (1/3424)

The Bordetella pertussis BrkA protein protects against the bactericidal activity of complement and antibody; however, some individuals mount an immune response that overcomes this bacterial defense. To further characterize this process, the bactericidal activities of sera from 13 adults with different modes of exposure to B. pertussis (infected as adults, occupational exposure, immunized with an acellular vaccine, or no identified exposure) against a wild-type strain and a BrkA complement-sensitive mutant were evaluated. All of the sera killed the BrkA mutant, suggesting past exposure to B. pertussis or cross-reactive organisms. Several samples had no or minimal activity against the wild type. All of the sera collected from the infected and occupationally exposed individuals but not all of the sera from vaccinated individuals had bactericidal activity against the wild-type strain, suggesting that some types of exposure can induce an immune response that can overcome the BrkA resistance mechanism. Adsorbing serum with the wild-type strain removed the bactericidal antibodies; however, adsorbing the serum with a lipopolysaccharide (LPS) mutant or an avirulent (bvg mutant) strain did not always result in loss of bactericidal activity, suggesting that antibodies to either LPS or bvg-regulated proteins could be bactericidal. All the samples, including those that lacked bactericidal activity, contained antibodies that recognized the LPS of B. pertussis. Bactericidal activity correlated best with the presence of the immunoglobulin G3 (IgG3) antibodies to LPS, the IgG subtype that is most effective at fixing complement.  (+info)

Surface-induced polymerization of actin. (2/3424)

Living cells contain a very large amount of membrane surface area, which potentially influences the direction, the kinetics, and the localization of biochemical reactions. This paper quantitatively evaluates the possibility that a lipid monolayer can adsorb actin from a nonpolymerizing solution, induce its polymerization, and form a 2D network of individual actin filaments, in conditions that forbid bulk polymerization. G- and F-actin solutions were studied beneath saturated Langmuir monolayers containing phosphatidylcholine (PC, neutral) and stearylamine (SA, a positively charged surfactant) at PC:SA = 3:1 molar ratio. Ellipsometry, tensiometry, shear elastic measurements, electron microscopy, and dark-field light microscopy were used to characterize the adsorption kinetics and the interfacial polymerization of actin. In all cases studied, actin follows a monoexponential reaction-limited adsorption with similar time constants (approximately 10(3) s). At a longer time scale the shear elasticity of the monomeric actin adsorbate increases only in the presence of lipids, to a 2D shear elastic modulus of mu approximately 30 mN/m, indicating the formation of a structure coupled to the monolayer. Electron microscopy shows the formation of a 2D network of actin filaments at the PC:SA surface, and several arguments strongly suggest that this network is indeed causing the observed elasticity. Adsorption of F-actin to PC:SA leads more quickly to a slightly more rigid interface with a modulus of mu approximately 50 mN/m.  (+info)

Bacteriophage inactivation at the air-water-solid interface in dynamic batch systems. (3/3424)

Bacteriophages have been widely used as surrogates for human enteric viruses in many studies on virus transport and fate. In this investigation, the fates of three bacteriophages, MS2, R17, and phiX174, were studied in a series of dynamic batch experiments. Both MS2 and R17 readily underwent inactivation in batch experiments where solutions of each phage were percolated through tubes packed with varying ratios of glass and Teflon beads. MS2 and R17 inactivation was the result of exposure to destructive forces at the dynamic air-water-solid interface. phiX174, however, did not undergo inactivation in similar studies, suggesting that this phage does not accumulate at air-water interfaces or is not affected by interfacial forces in the same manner. Other batch experiments showed that MS2 and R17 were increasingly inactivated during mixing in polypropylene tubes as the ionic strength of the solution was raised (phiX174 was not affected). By the addition of Tween 80 to suspensions of MS2 and R17, phage inactivation was prevented. Our data suggest that viral inactivation in simple dynamic batch experiments is dependent upon (i) the presence of a dynamic air-water-solid interface (where the solid is a hydrophobic surface), (ii) the ionic strength of the solution, (iii) the concentration of surface active compounds in the solution, and (iv) the type of virus used.  (+info)

Evidence that the neck appendages are adsorption organelles in Bacillus subtilis bacteriophage phi29. (4/3424)

A mutant of Bacillus subtilis unable to adsorb phage phi29 efficiently has been isolated. This mutant can be infected by host range mutants of the phage. Since the host range mutations map in cistron 12, which codes for neck appendage protein, this would tend to confirm that these organelles are involved in viral adsorption.  (+info)

Modulation of cell proliferation and differentiation through substrate-dependent changes in fibronectin conformation. (5/3424)

Integrin-mediated cell adhesion to extracellular matrices provides signals essential for cell cycle progression and differentiation. We demonstrate that substrate-dependent changes in the conformation of adsorbed fibronectin (Fn) modulated integrin binding and controlled switching between proliferation and differentiation. Adsorption of Fn onto bacterial polystyrene (B), tissue culture polystyrene (T), and collagen (C) resulted in differences in Fn conformation as indicated by antibody binding. Using a biochemical method to quantify bound integrins in cultured cells, we found that differences in Fn conformation altered the quantity of bound alpha5 and beta1 integrin subunits but not alphav or beta3. C2C12 myoblasts grown on these Fn-coated substrates proliferated to different levels (B > T > C). Immunostaining for muscle-specific myosin revealed minimal differentiation on B, significant levels on T, and extensive differentiation on C. Differentiation required binding to the RGD cell binding site in Fn and was blocked by antibodies specific for this site. Switching between proliferation and differentiation was controlled by the levels of alpha5beta1 integrin bound to Fn, and differentiation was inhibited by anti-alpha5, but not anti-alphav, antibodies, suggesting distinct integrin-mediated signaling pathways. Control of cell proliferation and differentiation through conformational changes in extracellular matrix proteins represents a versatile mechanism to elicit specific cellular responses for biological and biotechnological applications.  (+info)

Amino acid substitutions in a conserved region in the stalk of the Newcastle disease virus HN glycoprotein spike impair its neuraminidase activity in the globular domain. (6/3424)

The ectodomain of the paramyxovirus haemagglutinin-neuraminidase (HN) glycoprotein spike can be divided into two regions: a membrane-proximal, stalk-like structure and a terminal globular domain. The latter contains all the antibody recognition sites of the protein, as well as its receptor recognition and neuraminidase (NA) active sites. These two activities of the protein can be separated by monoclonal antibody functional inhibition studies and mutations in the globular domain. Herein, we show that mutation of several conserved residues in the stalk of the Newcastle disease virus HN protein markedly decrease its NA activity without a significant effect on receptor recognition. Thus, mutations in the stalk, distant from the NA active site in the globular domain, can also separate attachment and NA. These results add to an increasing body of evidence that the NA activity of this protein is dependent on an intact stalk structure.  (+info)

Differential mechanisms of retinoid transfer from cellular retinol binding proteins types I and II to phospholipid membranes. (7/3424)

Cellular retinol-binding proteins types I and II (CRBP-I and CRBP-II) are known to differentially facilitate retinoid metabolism by several membrane-associated enzymes. The mechanism of ligand transfer to phospholipid small unilamellar vesicles was compared in order to determine whether differences in ligand trafficking properties could underlie these functional differences. Unidirectional transfer of retinol from the CRBPs to membranes was monitored by following the increase in intrinsic protein fluorescence that occurs upon ligand dissociation. The results showed that ligand transfer of retinol from CRBP-I was >5-fold faster than transfer from CRBP-II. For both proteins, transfer of the other naturally occurring retinoid, retinaldehyde, was 4-5-fold faster than transfer of retinol. Rates of ligand transfer from CRBP-I to small unilamellar vesicles increased with increasing concentration of acceptor membrane and with the incorporation of the anionic lipids cardiolipin or phosphatidylserine into membranes. In contrast, transfer from CRBP-II was unaffected by either membrane concentration or composition. Preincubation of anionic vesicles with CRBP-I was able to prevent cytochrome c, a peripheral membrane protein, from binding, whereas CRBP-II was ineffective. In addition, monolayer exclusion experiments demonstrated differences in the rate and magnitude of the CRBP interactions with phospholipid membranes. These results suggest that the mechanisms of ligand transfer from CRBP-I and CRBP-II to membranes are markedly different as follows: transfer from CRBP-I may involve and require effective collisional interactions with membranes, whereas a diffusional process primarily mediates transfer from CRBP-II. These differences may help account for their distinct functional roles in the modulation of intracellular retinoid metabolism.  (+info)

Lysozyme sorption in hydrogel contact lenses. (8/3424)

PURPOSE: To examine the processes involved in formation of protein deposits on hydrogel contact lenses. METHODS: The adsorption and/or penetration of lysozyme on or into three types of contact lenses, etafilcon A, vifilcon A, and tefilcon, were investigated in vitro using a radiolabel-tracer technique, x-ray photoelectron spectroscopy, and laser scanning confocal microscopy. RESULTS: Binding of lysozyme to high-water-content, ionic contact lenses (etafilcon A and vifilcon A) was dominated by a penetration process. The extent of this penetration was a function of charge density of the lenses, so that there was a higher degree of penetration of lysozyme in etafilcon A than in vifilcon A lenses. In contrast, the binding of lysozyme to tefilcon lenses was a surface adsorption process. The adsorption and desorption kinetics showed similar trends to those found in human serum albumin (HSA) adsorption on lens surfaces. However, the extent of lysozyme adsorption on tefilcon is much higher than HSA adsorption, probably because of the self-association of lysozyme on the tefilcon lens surface. Furthermore, either penetration or adsorption of lysozyme involved reversible and irreversible processes and were both time dependent. CONCLUSIONS: Binding of lysozyme to hydrogel lenses involves surface adsorption or matrix penetration. These processes may be reversible or irreversible. The properties of the lens materials, such as charge density (ionicity) and porosity (water content) of the lenses, determine the type and rates of these processes.  (+info)

Langmuir Adsorption Isotherm calculators give you a List of Langmuir Adsorption Isotherm Calculators. A tool perform calculations on the concepts and applications into Langmuir Adsorption Isotherm.
This paper presents the adsorption properties of the o-Al13Co4(100) surface toward molecules involved in the semihydrogenation of acetylene. The energetically favored adsorption sites of H, C2H2, C2H3, and C2H4 are determined thanks to ab initio density functional calculations. The surface model used for this study has been determined previously [Phys. Rev. B 2011, 84, 085411], using an approach combining both experimental observations and density functional theory calculations. We show that although the surface termination layer of o-Al13Co4(100) is a dense Al-rich layer, its adsorption properties are quite different from pure elemental Al surfaces, especially for atomic hydrogen adsorption (exothermic on o-Al13Co4(100) and endothermic on low index Al surfaces). The role of surface and subsurface cobalt atoms is investigated carefully. The electronic donor/acceptor character of subsurface cobalt atoms is shown to influence the adsorption properties. In particular, the subsurface cobalt atoms have a
TY - JOUR. T1 - Protein Adsorption on Grafted Zwitterionic Polymers Depends on Chain Density and Molecular Weight. AU - Ahmed, Syeda Tajin. AU - Leckband, Deborah E.. PY - 2020/7/1. Y1 - 2020/7/1. N2 - This study demonstrates that protein adsorption on end-grafted, zwitterionic poly(sulfobetaine) (pSBMA) thin films depends on the grafting density, molecular weight, and ionic strength. Zwitterionic polymers exhibit ultralow nonspecific fouling (protein adsorption) and excellent biocompatibility. This picture contrasts with a recent report that soluble pSBMA chains bind proteins and alter the protein folding stability. To address this apparent contradiction, the dependence of protein adsorption on the chain grafting parameters is investigated: namely, the grafting density, molecular weight, and ionic strength. Studies compared the adsorption of phosphoglycerate kinase and positively charged lysozyme versus the scaled grafting parameter s/2RF, where s is the distance between grafting sites and RF ...
TY - JOUR. T1 - Adsorption properties and behavior of the platinum group metals onto a silica-based (Crea + TOA)/SiO2-P adsorbent from simulated high level liquid waste of PUREX reprocessing. AU - Xu, Yuanlai. AU - Kim, Seong Yun. AU - Ito, Tatsuya. AU - Tada, Tsutomu. AU - Hitomi, Keitaro. AU - Ishii, Keizo. PY - 2013/7/1. Y1 - 2013/7/1. N2 - To separate platinum group metals (PGMs) from high level liquid waste (HLLW), a novel silica-based (Crea + TOA)/SiO2-P adsorbent was synthesized by impregnating Crea (N′,N′-di-n-hexyl- thiodiglycolamide) and TOA (trioctylamine) two extractants into the macroporous SiO2-P support with a mean diameter of 60 μm. Adsorption properties and behavior of PGMs from simulated HLLW onto the novel silica-based (Crea + TOA)/SiO2-P adsorbent were investigated by batch method. It was found that (Crea + TOA)/SiO2-P adsorbent exhibited good adsorption selectivity for PGMs over the other tested fission product element in a wide HNO3 concentration. This adsorbent showed ...
Adsorption capacity is defined as the volume of gas that can be adsorbed per unit mass of coal at standard pressure. Learn about adsorption isotherms calculations, its concept, Freundlich isotherm & its properties along with freundlich adsorption isotherm calculation.
TY - JOUR. T1 - Protein adsorption mechanisms determine the efficiency of thermally controlled cell adhesion on poly(N -isopropyl acrylamide) brushes. AU - Choi, Sangwook. AU - Choi, Byung Chan. AU - Xue, Changying. AU - Leckband, Deborah E. PY - 2013/1/14. Y1 - 2013/1/14. N2 - This study investigated the impact of the protein adsorption mechanism(s) on the efficiency of thermally controlled cell adhesion and release from poly(N-isopropyl acrylamide) brushes. Large format polymer gradients were used to screen for grafting densities and substrate chemistries that alter both cell adhesion at 37 °C and rapid cell release at 25 °C. In particular, the grafting conditions investigated allowed protein adsorption to the underlying substrate, penetration of the brush only, or adsorption to the outer edge of the film. At an average molecular weight of 30 kDa (degree of polymerization N ∼ 270), the results show that robust protein adsorption to polymer brushes impairs rapid cell release below the lower ...
Based upon the adsorbate-adsorbent interactions due to pore size distribution and surface heterogeneity, as characterized by the adsorption isotherms, the adsorption phenomenon has many industrial and environmental applications. These adsorption isotherms are very important to define the information related to the equilibrium uptake of adsorbate-adsorbent pair. Due to the presence of different energy distribution of adsorption sites, pore size distribution, surface area availability and surface heterogeneity, of each of the adsorbent-adsorbate pair, these isotherms are categorized into six types by the International Union of Pure and Applied Chemistry and so far, in the literature, there is no generalized adsorption isotherm model available that can define and predict the behavior of all adsorption isotherm types. In this study, a universal adsorption isotherm model is developed based upon the energy distribution function of the available adsorption sites and the pore size. The proposed model is ...
A new kind of Fe-Si adsorbent was synthesized by iron oxide and diatomite after calcining and hydrothermal process. The influences of the initial Cu2+ concentration, pH and adsorption time on the Cu2+ removal efficiency were discussed. Three adsorption empirical kinetics equations and two thermodynamics equations were used to simulate the adsorption process. The microstructures of newly developed copper removal materials and properties of copper removal are characterized in details by SEM and EDS. Adsorption mechanism of the adsorbent was discussed. The suitable pH value for Cu2+ removal is 5.0 to 6.0 and the adsorption capacity increases with increasing the initial Cu2+ concentration. The adsorption kinetics of the adsorbent could be better described by pseudo second order kinetic model, whereas the adsorption isotherms highly conform to the Freundlich equation. The main crystalline phase of the adsorbent is Fe(SiO3) which can build porous structures conducive to the Cu2+ adsorption ...
TY - JOUR. T1 - Chemistry. T2 - Gas adsorption sites in a large-pore metal-organic framework. AU - Rowsell, Jesse L.C.. AU - Spencer, Elinor C.. AU - Eckert, Juergen. AU - Howard, Judith A.K.. AU - Yaghi, Omar M.. PY - 2005/8/26. Y1 - 2005/8/26. N2 - The primary adsorption sites for Ar and N2 within metal-organic framework-5, a cubic structure composed of Zn4O(CO2) 6 units and phenylene links defining large pores 12 and 15 angstroms in diameter, have been identified by single-crystal x-ray diffraction. Refinement of data collected between 293 and 30 kelvin revealed a total of eight symmetry-independent adsorption sites. Five of these are sites on the zinc oxide unit and the organic link; the remaining three sites form a second layer in the pores. The structural integrity and high symmetry of the framework are retained throughout, with negligible changes resulting from gas adsorption.. AB - The primary adsorption sites for Ar and N2 within metal-organic framework-5, a cubic structure composed of ...
Adsorption characteristics of light gases on basalt rock-based zeolite 4A: The adsorption characteristics of light gases on basalt rock-based zeolite 4A (BR zeo
In the mixing process of concrete, the addition of auxiliary cementitious building materials can improve the performance of concrete while saving resources, but due to the compatibility problem of raw materials, there shall occur poor fluidity and abnormal setting etc. for the early-period concrete. For this, based on the adsorption mechanism of water reducer on auxiliary cementitious building materials, this paper carries out the study on the adsorption characteristics of three kinds of polycarboxylate superplasticizer (PCS) on the surface of fly ash, and solves the problem of relationship between the PC dosage/adsorption capacity and particle size of fly ash. The results show that the PC structure has a significant influence on the adsorption capacity, and its adsorption capacity on the surface of fly ash gradually increases and becomes saturated with the increase of its dosage. This study is of great significance for the selection of water reducer and the dosage application ...
Isotherms, Kinetics and Thermodynamic Parameters Studies of New Fuchsin Dye Adsorption on Granular Activated Carbon dye adsorption;adsorption isotherm;adsorption thermodynamics;adsorption kinetics;adsorption equilibrium; Batch adsorption studies including equilibrium, kinetics and thermodynamic parameters for the adsorption of new fuchsin dye using granular activated carbon were investigated with varying the operating variables such as initial concentration, contact time and temperature. Equilibrium adsorption data were fitted into Langmuir, Freundlich, Dubinin-Radushkevich and Temkin isotherms. Adsorption equilibrium was mostly well described by Langmuir Isotherm. From the estimated separation factor of Langmuir ($R_L$ = 0.023), and Freundlich (1/n = 0.198), this process could be employed as an effective treatment for the adsorption of new fuchsin dye. Also based on the adsorption energy (E = 0.002 kJ/mol) from Dubinin-Radushkevich isotherm and the adsorption heat constant (B = 1.920 J/mol) from
TY - JOUR. T1 - Surface characterization of the TiClx/MgCl2 model Ziegler-Natta polymerization catalysts. T2 - Adsorption site studies using mesitylene thermal desorption. AU - Kim, Seong. AU - Tewell, Craig R.. AU - Somorjai, Gabor A.. PY - 2000/11/28. Y1 - 2000/11/28. N2 - Temperature-programmed desorption (TPD) of physisorbed mesitylene molecules has been used as a nondestructive surface probe to distinguish the surface adsorption sites of model Ziegler-Natta polymerization catalysts. A MgCl2-supported titanium chloride film (TiClx/MgCl2) was fabricated on an inert gold substrate by codeposition of Mg metal and TiCl4 from the gas phase. The mesitylene TPD probe revealed two types of surface adsorption sites. The dominant site was attributed to the basal plane of these halide crystallites. The minor site could be tentatively attributed to a defective structure at the basal plane boundaries or other crystal planes. Due to the chlorine termination nature of the catalyst surface, the metal ions ...
The purpose of this study was to elucidate the characteristics and mechanisms of adsorption and desorption for heavy metals by micro and nano-sized biogenic CaCO3 induced by Bacillus subtilis, and the pH effect on adsorption was investigated. The results showed that the adsorption characteristics of Cd2+ and Pb2+ are well described by the Langmuir adsorption isothermal equation, and the maximum adsorption amounts for Cd2+ and Pb2+ were 94.340 and 416.667 mg/g, respectively. The maximum removal efficiencies were 97% for Cd2+, 100% for Pb2+, and the desorption rate was less than 3%. Further experiments indicated that the biogenic CaCO3 could maintain its high adsorption capability for heavy metals within wide pH ranges (3-8). The FTIR and XRD results showed that, after the biogenic CaCO3 adsorbed Cd2+ or Pb2+, it did not produce a new phase, which indicated that biogenic CaCO3 and heavy metal ions are governed by a physical adsorption process, and the high adsorptive capacity of biogenic CaCO3 for Cd2+
This book provides researchers and graduate students with an overview of the latest developments in and applications of adsorption processes for water treatment and purification. In particular, it covers current topics in connection with the modeling and design of adsorption processes, and the synthesis and application of cost-effective adsorbents for the removal of relevant aquatic pollutants. The book describes recent advances and alternatives to improve the performance and efficacy of this water purification technique. In addition, selected chapters are devoted to discussing the reliable modeling and analysis of adsorption data, which are relevant for real-life applications to industrial effluents and groundwater. Overall, the book equips readers with a general perspective of the potential that adsorption processes hold for the removal of emerging water pollutants. It can readily be adopted as part of special courses on environmental engineering, adsorption and water treatment for upper ...
Discharge of untreated industrial wastewater containing heavy metals such as Pb2+ is hazardous to the environment due to their high toxicity. This study reports on the adsorption, desorption, and kinetic study on Pb2+ removal from aqueous solutions using wood/Nano-manganese oxide composite (WB-NMO). The optimum pH, contact time and temperature for adsorption were found to be 5.0, 4 h and 333 K, respectively. Pseudo-second-order kinetics best described the adsorption process with an initial sorption rate of 4.0 mg g min-1, and a half-adsorption time t1/2 of 31.6 min. Best fit for adsorption isotherm was obtained with the Brunauer-Emmett-Teller (BET) model with a maximum adsorption capacity of 213 mg/g for an initial metal concentration of 60 mg/L. Both intra-particle diffusion and film diffusion contribute to the rate-determining step. Desorption experiments with 0.5 mol/L HCl, inferred the reusability of the composite. Adsorption experiment of Pb2+ from industrial wastewater confirmed that the prepared
The competitive adsorption of toluene and n-alkanes at binary solution/silica interfaces was studied at room temperature using IR-visible sum frequency generation vibrational spectroscopy. The Surface coverage of toluene for toluene-pentane, toluene-heptane, and toluene-tetradecane mixtures was measured over the complete mole fraction range from 0 to 1. The competitive adsorption process was reversible, and the toluene coverage only depended oil the bulk mole fraction, not on the history of the system. The estimated molar adsorption free energy of toluene is 3.4 +/- 0.3, 1.8 +/- 0.3, and 0.84 +/- 0.3 kJ/mol higher than pentane, heptane, and tetradecane, respectively. Overall, toluene competes favorably on silica, and the molar adsorption free energy of alkanes increases as the chain length increases. It is consistent with the observed SFG spectra, indicating that the alkanes lie flat on the silica surface.. ...
J Mater Sci. DOI 10.1007/s10853-014-8333-x. Adsorption characteristics of noble metals on the strongly basic anion exchanger Purolite A-400TL. A. Wolowicz • Z. Hubicki. Received: 14 March 2014/Accepted: 16 May 2014. © The Author(s) 2014. This article is published with open access at Abstract Ion exchange is an alternative process for uptake of noble metals from aqueous solutions. In the present study, the sorption ofPd(II), Pt(IV), and Au(III) ions from aqueous solution was investigated by using Purolite A-400TL (strongly basic anion exchanger, gel, type I) in a batch adsorption system as a function of time (1 min-4 h). Initial Pd(II) concentration (100-1000 mg/L), beads size (0.425-0.85 mm), rate of phases mixing (0-180 rpm), and temperatures (ambient, 313 K) were taken into account during the Pd(II) sorption process. Moreover, the column flow adsorption study was carried out, and the breakthrough curves were obtained for Pd(II) ions. The equilibrium, kinetic, desorption, ...
TY - JOUR. T1 - Effect of transport mechanisms on the irreversible adsorption of large molecules. AU - Bafaluy, F. J.. AU - Choi, H. S.. AU - Senger, B.. AU - Talbot, J.. PY - 1995/1/1. Y1 - 1995/1/1. N2 - We consider one-dimensional models for the irreversible adsorption of large molecules on a solid surface. The study is motivated by recent simulations of the diffusion random sequential adsorption process in which hard spheres diffuse above an adsorbing surface. We first consider a generalized parking process in which the rate of deposition of a particle within a gap formed by two preadsorbed spheres depends on the width of the gap, but is uniform within a gap. We demonstrate simply that all generalized parking processes, including simple random sequential adsorption (RSA), have the same jamming limit coverage. As a by-product of this analysis, we obtain a recursion formula for the saturation coverage in gaps of finite length. In the second part of the paper, we consider a parking process in ...
The adsorption of paracetamol and non-steroidal anti-inflammatory drugs (ibuprofen and naproxen) on ordered mesoporous carbons (OMC) and, for comparison, on commercial activated carbon, were investigated in this work. OMC adsorbents were obtained by the soft-templating method and were characterized by low-temperature nitrogen adsorption and scanning electron microscopy (SEM). The effects of contact time and initial concentration of organic adsorbates on the adsorption were studied. The contact time to reach equilibrium for maximum adsorption was 360 min for all the studied adsorbates. The adsorption mechanism was found to fit pseudo-second-order and intra particle-diffusion models. Freundlich, Langmuir and Langmuir-Freundlich isotherm models were used to analyze equilibrium adsorption data. Based on the obtained experimental data, the adsorption isotherm in the applied concentration range for all the studied adsorbates was well represented by the Freundlich-Langmuir model. The adsorption ability of
The ability of commercial activated carbon to adsorb Pb2+ from aqueous solution has been investigated through batch experiments. The adsorption of lead onto commercial activated carbon has been found to depend on adsorbent dose, initial concentration and contact time. The experiments were carried out at natural solution pH. Equilibrium data fitted well with the Langmuir model and Freundlich model with a maximum adsorption capacity of 23.81 mg of Pb/g of commercial activated carbon. The experiments showed that the highest removal rate was 92.42% for Pb2+ under optimal conditions. The sorption of Pb2+ on commercial activated carbon was rapid during the first 30 min and the equilibrium attained within 60 min. The kinetic processes of Pb2+ adsorption on commercial activated carbon were described by applying pseudo-first-order and pseudo-second-order kinetic models. The kinetic data for the adsorption process obeyed a pseudo-second-order kinetic model, suggesting that the adsorption process is ...
During the last years, the authors have synthesized, characterized, and studied the adsorption properties of nitroprussides, Prussian blue analogues, akaganeites, MeAPOs, metal-organic frameworks, and extremely high specific surface amorphous silica, which allowed the storage of about 11 wt.% of hydrogen in the form of ammonia. In this sense, using the solid-state reaction method, sol-gel methodologies, together with aluminosilicate, high silica and non-aluminosilicate zeolite synthesis methods, were described, moreover was explained how to prepare active carbons along with the synthesis of Prussian blue analogues (PBAs) and nitroprussides (NPs). In addition, the characterization of the materials of interest applying X-ray diffraction, thermogravimetric analysis, DRIFTS, and room-temperature Mossbauer spectrometry was discussed. Besides, the concepts that define physical adsorption and examples of adsorption data, which were tested with the help of the Dubinin, osmotic adsorption and Langmuir-type
Our understanding on how ash particles in volcanic plumes react with coexisting gases and aerosols is still rudimentary, despite the importance of these reactions in influencing the chemistry and dynamics of a plume. In this study, six samples of fine ash (,100 mgrm) from different volcanoes were measured for their specific surface area, as, porosity and water adsorption properties with the aim to provide insights into the capacity of silicate ash particles to react with gases, including water vapour. To do so, we performed high-resolution nitrogen and water vapour adsorption/desorption experiments at 77 K and 303 K, respectively. The nitrogen data indicated as values in the range 1.1-2.1 m2/g, except in one case where a as of 10 m2/g was measured. This high value is attributed to incorporation of hydrothermal phases, such as clay minerals, in the ash surface composition. The data also revealed that the ash samples are essentially non-porous, or have a porosity dominated by macropores with ...
Adsorption properties of layered anionic clay-composites for the removal of anionic dyes from water were studied. The dye adsorption capacities of the composites were higher than the pristine clay. The clay-alginate composite with 5.9% alginate showed highest adsorption for both the dyes. The maximum adsorption capacity of the composite was enhanced by 51% for Acid Green 25 and 160% for Acid Green 27, compared to the pristine layered clay sample. The adsorption isotherm data were fitted to the Langmuir, Freundlich and Temkin isotherm models. The isotherm data could be explained well using the Freundlich isotherm model. Adsorption kinetics was analyzed using normal first order and Lagergren first order kinetic models.
The adsorption characteristics of pure water vapor onto two different types of silica gel at temperatures from (298 to 338) K and at different equilibrium pressures between (500 and 7000) Pa were experimentally studied by a volumetric technique. The thermophysical properties such as the skeletal density, Brunauer-Emmett-Teller surface area, pore size, pore volume, and total porosity of silica gel were determined. The Tóth isotherm model is found to fit all of the experimental data within the experimental errors. The experimental isotherms and the computed enthalpies of adsorption are compared with those of various researchers and found to be consistent with a chiller manufacturers data ...
Adsorption behaviour of Ni(II), Cd(II) and Pb(II) from aqueous solutions by shells of hazelnut and almond were investigated. The structural properties and surface chemistry of the shells were characterized using sorption of nitrogen and Boehm titration. The equilibrium time was found to be 120 min. The equilibrium adsorption capacity of shells were obtained by using linear Langmuir and Freundlich adsorption isotherms. The equilibrium adsorption level was determined to be a function of the solution contact time, concentration and temperature. The thermodynamic parameters have been determined. The negative values of free change (Delta G) indicated the spontaneous nature of the adsorption of Ni(II), Cd(II) and Pb(II) onto shells of hazelnut and almond and the positive values of enthalpy change (Delta H) suggested the endothermic nature of the adsorption process, The best correlation coefficients were obtained for the pseudo second-order kinetic model. Ion exchange is probably one of the major ...
TY - CONF AU - Vidović, Milka AU - Marinković, Dalibor AU - Mladenović, Nikola AU - Krstić, Jelena PY - 2007 UR - AB - The adsorption process are more and more frequently applied in water treatments. The choice of the adsorption medium depends on the adsorption capacity. The adsorption capacity in statical conditions should always preceeds the determination of the adsorption capacity in dynamic conditions, because it represents one of the main indicators of the proper determination of technological parameters in the process of water purification. The aim of this paper is to present a method for determination of specific adsorption capacity according to linear form of Freundlich`s equation and adsorption capacity in accordance with Lengmuir`s equation and its linear form. AB - Adsorpcioni procesi se sve češće primenjuju u tretmanima prečišćavanja vode. Izbor adsorpcionog medijuma zavisi od adsorpcionog kapaciteta. Adsorpcioni kapacitet u ...
In this paper, wool carpet dye adsorption properties of nanoporous activated carbon materials (NCMs) prepared from bamboo agro-product is reported. Bamboo cane powder was chemically activated with phosphoric acid at different temperatures (400, 500, and 600 °C) at an impregnation ratio of 1:1. We found that the specific surface area and the total pore volume of NCM increases with temperature giving the highest surface area and pore volume ca. 2130 m2·g−1 and 2.69 cc·g−1 at 600 °C. Owing to superior surface textural properties, bamboo-derived NCM showed excellent adsorption capacity for wool carpet dyes Lanasyn orange (LO) and Lanasyn gray (LG). The adsorption phenomena could be described by Langmuir/Freundlich adsorption isotherm models. The maximum adsorption capacity was ca. 2.60 × 103 and 3.04 × 103 mg·g−1 for LO and LG, respectively. The adsorption followed pseudo second order kinetics with the second order rate constant of 1.24 × 10−3 g·mg−1·min−1 (LO) and 7.69 × 10−4 g·mg
Aikpokpodion, P.E., Osobamiro, T., Atewolara-Odule, O.C., Oduwole, O.O., Ademola, S.M. Studies on adsorption mechanism and kinetics of magnesium in selected cocoa growing soils in Nigeria. Journal of Chemical and Pharmaceutical Research, vol. 5, p. 128-139, 2013 ...
Background: Effective bimolecular adsorption of proteins onto solid matrices is characterized by in-depth understanding of the biophysical features essential to optimize the adsorption performance, Results: The adsorption of bovine serum albumin (BSA) onto anion-exchange Q-sepharose solid particulate support was investigated in batch adsorption experiments, Adsorption kinetics and isotherms were developed as a function of key industrially relevant parameters such as polymer loading, stirring speed, buffer pH, protein concentration and the state of protein dispersion (solid/aqueous) in order to optimize binding performance and adsorption capacity, Experimental results showed that the first order rate constant is higher at higher stirring speed, higher polymer loading, and under alkaline conditions, with a corresponding increase in equilibrium adsorption capacity, Increasing the stirring speed and using aqueous dispersion protein system increased the adsorption rate, but the maximum protein ...
Due to high biocompatibility and tailorable properties, DNA-based nanostructures are widely studied in biosensor and nanomedicine applications. The restriction for using DNA-based nanostructures lie in the purification processes which have low product yield and tedious steps involved. MoS2 nanosheets are chosen to test for its purification efficiency as MoS2 is shown to have discriminating properties between single stranded DNA and double stranded DNA. Adsorption studies of different DNA nanostructures are tested to see the adsorption capacity of MoS2. From the adsorption studies, it has been observed that MoS2 has high affinity to plasmid DNA, so the use of MoS2 as a gene carrier is tested for its delivery performance ...
Batch adsorption experiments were conducted to investigate equilibrium, kinetic and thermodynamics of the sorption of Methylene Blue onto Fly Ash modified with various concentrations of hydrochloric acid (FAHC-4, FAHC-3, FAHC-2 and FAHC-1). Equilibrium data was best described by the Freundlich isotherm model which suggests adsorbents had heterogeneous surfaces therefore multilayer adsorption occurred in all cases. Fly Ash modified with 1M HCl exhibited the highest adsorption capacity (9.8 mg/L) and Fly Ash modified with 4M HCl had the least adsorption capacity (4.4mg/L). Kinetic data was best described by the pseudo-second-order kinetic model which means adsorption processes were controlled by chemisorption. Boyd kinetic model plots revealed that the rate determining step of each sorption process followed the film diffusion mechanism in which adsorbate ions travelled towards the external surfaces of adsorbents due to electrostatic interactions between chemically modified Fly Ash and adsorbate ...
In this study, a new cellulose-based nano-adsorbent was synthesized using a simple method. The synthesized adsorbent was characterized using FT-IR, FESEM and EDX analyses. Adsorption characteristics of epoxy-triazine-modified cellulose nan-adsorbent were compared with cellulose for the removal of malachite green dye from aqueous media. The effects of surface improvement on the adsorption of organic adsorptive were studied by considering various parameters such as contact time, adsorbent dosage, pH, and temperature. The obtained results indicated that the pseudo-second-order model and Freundlich isotherm model well describe the dye adsorption process on the nano-adsorbent. The maximum adsorption capacity of MG on the nano-adsorbent at 45 ˚C was found to be 49.26 mg/g. Furthermore, the calculated thermodynamic parameters showed that the adsorption process of the MG dye was endothermic and associated with an increase in entropy.
Abstract The adsorption of four substances and their binary mixture is investigated via the terahertz time domain spectroscopy (THz-TDS). The selected unary compound (ethanol, acetone, ethyl acetate, and n-propyl acetate) and binary mixture (solution 1 is composed of ethanol and acetone, and solution 2 is composed of ethyl acetate and n-propyl acetate) exhibit different adsorption behaviors with varied polarities. In comparison with single component, solution 1 shows shorter adsorption equilibrium time, faster adsorption rate, and stronger adsorption capacity, which conform to a synergistic adsorption mechanism, while the competitive behavior is attributed to the slower adsorption in solution 2. In addition, the pseudo-second-order equation with terahertz parameter is used to assess the rate of binary component organics. The present results indicate a further understanding of multicomponent adsorption mechanisms ...
For the first time, we have used a metal oxide-coated quartz crystal microbalance (QCM) to measure Cs+ adsorption onto illuminated and un-illuminated mesoporous TiO2 (m-TiO2) films by microgravimetric means in-situ. In the simplest case, such experiments yield two parameters of interest: K, the Langmuir adsorption coefficient and mmax the maximum mass of adsorbate to form a complete monolayer at the m-TiO2-coated quartz crystal piezoelectric surface. Importantly, we have found that illumination of the m-TiO2 film with ultra bandgap light results in an increase in mmax i.e. illumination allows for greater adsorption of substrate to occur than in the dark. Our studies also show that under illumination, K also increases indicating a higher affinity for surface adsorption. The photoinduced change in mmax and K are thought to be due to an increase in surface bound titanol groups, thus increasing the number of available adsorption sites - and so providing evidence to support the notion of photoinduced ...
TY - JOUR. T1 - Sol-gel synthesis and gas adsorption properties of CuCl modified mesoporous alumina. AU - Wang, Y.. AU - Lin, Y. S.. PY - 1998. Y1 - 1998. M3 - Article. VL - 1. SP - 185. EP - 195. JO - J. Sol-Gel Sci. Tech.. JF - J. Sol-Gel Sci. Tech.. ER - ...
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This thesis presents experimental studies of polyelectrolyte adsorption on oppositely charged surfaces, where substrates of both silica and bleached softwood kraft pulp were used. A major aim of this research was to characterise the conformation of adsorbed layers of cationic polyacrylamide (CPAM), in comparison to cationic dextran (Cdextran), and relate this information to the binding capacity of colloidal silica. A second aim in this thesis was to study the kinetics of the sequential adsorption of polyamide epichlorohydrine (PAE) and carboxymethyl cellulose (CMC) on pulp fibres, and to determine the adsorption isotherms for the layer-by-layer deposition of polyelectrolytes on pulp fibres.. The adsorption of CPAM on silica surfaces was studied using stagnation point adsorption reflectometry and quartz crystal microgravimetry to determine its adsorption kinetics as well as the dependencies of polyelectrolyte charge densities, pH, and NaCl concentration on saturation adsorption. The conformation ...
Read Synthesis, Characterization, and Adsorption Properties of a Graphene Composite Sand (GCS) and Its Application in Remediation of Hg(II) Ions, Water, Air, Soil Pollution on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Fingerprint Dive into the research topics of Control of interpenetration: Via in situ lithium incorporation in MOFs and their gas adsorption properties and selectivity. Together they form a unique fingerprint. ...
TY - JOUR. T1 - Nanoscale control of layer thickness for EL devices by mass-controlled layer-by-layer sequential adsorption process. AU - Shiratori, Seimei. AU - Yamada, Masayoshi. AU - Ito, Takahiro. AU - Wang, Tom C.. AU - Rubner, Michael F.. PY - 2000/12/1. Y1 - 2000/12/1. N2 - A mass controlled layer-by-layer sequential adsorption process for polyelectrolytes was newly developed for the fabrication of functional devices using ultra-thin organic film formed by various polymers of different polarity of charge. In this study hydrophobic Ruthenium complex monomer (tris(bipyridyl) ruthenium(II) hexafluorophosphate) was micelle-wrapped with an anionic surfactant, sodium dodecylbenzenesulfonate, and was assembled with PAH (poly (allylamine hydrochloride)), which has the opposite charge, on ITO substrates. With this method, we succeeded in fabricating ultra-thin organic films even when the adsorption material is not polymer but monomer. Moreover it was found that the film thickness of the ...
This thesis presents experimental studies of polyelectrolyte adsorption on oppositely charged surfaces, where substrates of both silica and bleached softwood kraft pulp were used. A major aim of this research was to characterise the conformation of adsorbed layers of cationic polyacrylamide (CPAM), in comparison to cationic dextran (Cdextran), and relate this information to the binding capacity of colloidal silica. A second aim in this thesis was to study the kinetics of the sequential adsorption of polyamide epichlorohydrine (PAE) and carboxymethyl cellulose (CMC) on pulp fibres, and to determine the adsorption isotherms for the layer-by-layer deposition of polyelectrolytes on pulp fibres.. The adsorption of CPAM on silica surfaces was studied using stagnation point adsorption reflectometry and quartz crystal microgravimetry to determine its adsorption kinetics as well as the dependencies of polyelectrolyte charge densities, pH, and NaCl concentration on saturation adsorption. The conformation ...
The Adsorption Characteristics of NI (II) Onto Bubble Surface. The removal of Ni(II) by foam fractionation is brought about by the electrostatic mechanism. From removal and zeta potential measurements, it clearly demonstrates that Ni**2** plus and NiOH** plus ions become associated with the dodecylsulfonate coated (negative charge) N//2 gas bubbles. The optimal Ni(II) to NaDS (molar ratio) is 0. 2. The Ni**2** plus species forms moderately strong complexes with dodecylsulfonate ions.
We use Ca doping during growth of one- and two-monolayer-thick MgO films on Ag(100) to identify the adsorption sites of individual adatoms with scanning tunnelingmicroscopy. For thiswe combine atomic resolution images of the bare MgO layer with images of the adsorbates and the substitutional Ca atoms taken at larger tip-sample distance. For Ho atoms, the adsorption sites depend on MgO thickness. On the monolayer, they are distributed on the O and bridge sites according to the abundance of those sites, 1/3 and 2/3, respectively. On the MgO bilayer, Ho atoms populate almost exclusively the O site. A third species adsorbed on Mg is predicted by density functional theory and can be created by atomic manipulation. Au atoms adsorb on the bridge sites for both MgO thicknesses, while Co and Fe atoms prefer the O sites, again for both thicknesses.. ...
It was found that slow desorption kinetics determine the cyclic working capacity for CO2 and H2O. Furthermore, four different adsorption sites are required to describe the observed complex adsorption behaviour of CO2 and H2O and their cyclic working capacity was determined based on many different carefully designed TGA and PBR breakthrough experiments. The sorption model includes two independent adsorption sites for H2O and CO2 (sites A and B resp.) and another site which can be occupied by both CO2 and H2O, where one component replaces the other (site C). A fourth site (site D) describes the general higher adsorption capacity of the sorbent if H2O and CO2 are fed together to the sorbent ...
Molecularly imprinting (MI) hydrogels for selective adsorption of trypsin are reported. The trypsin imprinted hydrogels were prepared using a polyethylene glycol (PEG)-based dimethacrylate as a crosslinker and anionic functional monomers. The hydrogel prepared without any functional monomers showed significantly low ability to adsorb a variety of proteins. We optimized the concentration and the length of PEG units of the crosslinkers to achieve the complete removal of the template molecule and suitable selective adsorption. Additionally, the functional monomers chosen were anionic since the template, trypsin, is a basic protein. The adsorption tests for proteins, done on the prepared MI gels, indicated that the MI gel prepared with sodium allyl sulfonate (AS) as a functional monomer showed much higher selective adsorption for trypsin, even though a mixture of trypsin and cytochrome c was used as the protein solution. The selective adsorption was more effective in a NaCl solution in which the ...
Atomic oxygen adsorption on a pure aluminum terminated Al 9Co2(001) surface is studied by first-principle calculations coupled with STM measurements. Relative adsorption energies of oxygen atoms have been calculated on different surface sites along with the associated STM images. The local electronic structure of the most favourable adsorption site is described. The preferential adsorption site is identified as a bridge type site between the cluster entities exposed at the (001) surface termination. The Al-O bonding between the adsorbate and the substrate presents a covalent character, with s-p hybridization occurring between the states of the adsorbed oxygen atom and the aluminum atoms of the surface. The simulated STM image of the preferential adsorption site is in agreement with experimental observations. This work shows that oxygen adsorption generates important atomic relaxations of the topmost surface layer and that sub-surface cobalt atoms strongly influence the values of the adsorption ...
TY - JOUR. T1 - Adsorption and desorption kinetics for hydrophilic and hydrophobic vapors on activated carbon. AU - Fletcher, A.J.. AU - Yuzak, Y.. AU - Thomas, K.M.. PY - 2006/4. Y1 - 2006/4. N2 - Adsorption dynamics are of fundamental importance in applications of adsorbents in real situations. The adsorption/desorption characteristics of a series of adsorbates, with varying hydrophilic/hydrophobic and structural characteristics, for activated carbon BAX950, were investigated for temperatures in the range 288-323 K. These data provide a comprehensive kinetic study of adsorption/desorption for an activated carbon. The results are discussed in relation to the adsorbent pore structure and functional group concentration, adsorptive structure and adsorption mechanism. The study provides evidence for a compensation effect where activation energy and ln(pre-exponential factor) parameters obtained from the Arrhenius equation exhibit a linear correlation.. AB - Adsorption dynamics are of fundamental ...
In order to shed some light on DNA preservation over time in skeletal remains from a physicochemicalviewpoint, adsorption and desorption of DNA on a well characterized synthetic apatite mimicking boneand dentin biominerals were studied. Batch adsorption experiments have been carried out to determinethe effect of contact time (kinetics), DNA concentration (isotherms) and environmentally relevant factorssuch as temperature, ionic strength and pH on the adsorption behavior. The analogy of the nanocrystallinecarbonated apatite used in this work with biological apatite was first demonstrated by XRD, FTIR, andchemical analyses. Then, DNA adsorption kinetics was fitted with the pseudo-first order, pseudo-secondorder, Elovich, Ritchie and double exponential models. The best results were achieved with the Elovichkinetic model. The adsorption isotherms of partially sheared calf thymus DNA conformed satisfacto-rily to Temkins equation which is often used to describe heterogeneous adsorption behavior ...
A quartz crystal microbalance with dissipation (QCM-D) and an optical reflectometer (OR) have been used to investigate the adsorption behavior of Laponite and Ludox silica nanoparticles at the solid-liquid interface. The adsorption of both Laponite and Ludox silica onto poly(diallyldimethylammonium chloride) (PDADMAC)-coated surfaces over the first few seconds were studied by OR. Both types of nanoparticles adsorbed rapidly and obtained a stable adsorbed amount after only a few minutes. The rate of adsorption for both nanoparticle types was concentration dependent. The maximum adsorption rate of Ludox nanoparticles was found to be approximately five times faster than that for Laponite nanoparticles. The QCM data for the Laponite remained stable after the initial adsorption period at each concentration tested. The observed plateau values for the frequency shifts increased with increasing Laponite particle concentration. The QCM data for the Ludox nanoparticles had a more complex long-time ...
Adsorption capabilities[edit]. Model. Pore diameter (Ångström). Bulk density (g/ml). Adsorbed water (% w/w). Attrition or ... Adsorption of water in sodium aluminosilicate which is FDA approved (see below) used as molecular sieve in medical containers ... Desiccation of petroleum cracking gas and alkenes, selective adsorption of H2O in insulated glass (IG) and polyurethane ... The characteristics of these molecular sieves include fast adsorption speed, frequent regeneration ability, good crushing ...
Adsorption hysteresis[edit]. Hysteresis can also occur during physical adsorption processes. In this type of hysteresis, the ... of mesoporosity in nitrogen adsorption isotherms as a function of Kelvin radius.[13] An adsorption isotherm showing hysteresis ... Gregg, S. J.; Sing, Kenneth S. W. (1982). Adsorption, Surface Area, and Porosity (Second ed.). London: Academic Press. ISBN 978 ... In physical adsorption, hysteresis is evidence of mesoporosity-indeed, the definition of mesopores (2-50 nm) is associated with ...
Polymer adsorption[edit]. Main article: polymer adsorption. Adsorption of molecules onto polymer surfaces is central to a ... Portal site mediated adsorption[edit]. Portal site mediated adsorption is a model for site-selective activated gas adsorption ... Polymers may also be adsorbed to surfaces through polyelectrolyte adsorption. Adsorption in viruses[edit]. Adsorption is the ... Adsorption enthalpy[edit]. Adsorption constants are equilibrium constants, therefore they obey the van 't Hoff equation: (. ∂. ...
Soil adsorption[edit]. Adsorption is a measure of the distribution between soluble and sediment adsorbed contaminants following ... Adsorption coefficient values have been shown to increase with an increase in the number of amino groups. Thus, adsorption of ... Therefore, when considering the adsorption of TNT, the type of soil or sediment and the ionic composition and strength of the ... Research has shown that in freshwater environments, with a high abundances of Ca2+, the adsorption of TNT and its ...
Adsorption capacity[edit]. Adsorption capacity of coal is defined as the volume of gas adsorbed per unit mass of coal usually ... as the methane is stored within the coal by a process called adsorption. The methane is in a near-liquid state, lining the ... Its use for irrigation is limited by its relatively high sodium adsorption ratio. ...
Expanded bed adsorption chromatographic separation[edit]. Further information: Expanded bed adsorption. An expanded bed ... In expanded bed adsorption, a fluidized bed is used, rather than a solid phase made by a packed bed. This allows omission of ... Expanded-bed adsorption (EBA) chromatography is a convenient and effective technique for the capture of proteins directly from ... When we make one solvent immobile (by adsorption on a solid support matrix) and another mobile it results in most common ...
AdsorptionEdit. The SSA can be measured by adsorption using the BET isotherm. This has the advantage of measuring the surface ... adsorption,[5] electrokinetic analysis of complex-ion adsorption[4] and a Protein Retention (PR) method.[6] ... In adsorption based methods, the size of the adsorbate molecule (the probe molecule), the exposed crystallographic planes at ... adsorption method, several techniques have been developed to measure the specific surface area of particulate materials at ...
Enzyme adsorption onto carriers functions based on chemical and physical phenomena such as van der Waals forces, ionic ... Many immobilization techniques exist, such as adsorption, covalent binding, affinity, and entrapment. Ideal immobilization ... Jesionowski, Teofil; Zdarta, Jakub; Krajewska, Barbara (2014-08-01). "Enzyme immobilization by adsorption: a review". ... and high adsorption capacity. Enzymes typically constitute a significant operational cost for industrial processes, and in many ...
Adsorption. 22 (4): 366-375. doi:10.1007/s10450-015-9740-2.. ...
Adsorption. 16 (4-5): 183-184. doi:10.1007/s10450-010-9222-5.. ...
Limitations on efficient hydrogen adsorption[edit]. The biggest obstacle to efficient hydrogen storage using CNTs is the purity ... The data showed that hydrogen adsorption levels of up to 3.7% are possible with a very pure sample and under the proper ... They also showed similar adsorption capacities as activated carbons in the presence of natural organic matter.[157] As a result ... The purified samples were then exposed to hydrogen gas at various high pressures, and their adsorption by weight percent was ...
Adsorption, 2016. 22 (8): 1147-1155. DOI:10.1007/s10450-016-9838-1. v t e Salts and covalent derivatives of the nitrate ion. ...
Molecularly imprinted materials of insulin and other drugs at the nanoscale were shown to exhibit high adsorption capacity for ... Nishide, H.; Tsuchida, E. (1976). "Selective adsorption of metal ions on poly (4‐vinylpyridine) resins in which the ligand ... Dickey, Frank (1955). "Specific Adsorption". The Journal of Physical Chemistry. 59 (8): 695-707. doi:10.1021/j150530a006. ...
Adsorption (attachment)[edit]. The effectiveness of a medium to adsorb to a particle is influenced by the relationship between ... In froth flotation, adsorption is a strong consequence of surface energy, since the small particles have a high surface area to ... The adsorption of particles to bubbles is essential to separating the minerals from the slurry, but the minerals must be ... It is important to know the collision rates in the system since this step precedes the adsorption where a three phase system is ...
Better surface adsorption. Atomically thin boron nitride has been found to have better surface adsorption capabilities than ... The synergic effect of the atomic thickness, high flexibility, stronger surface adsorption capability, electrical insulation, ... "Molecule-Induced Conformational Change in Boron Nitride Nanosheets with Enhanced Surface Adsorption". Advanced Functional ... atomically thin boron nitride as an adsorbent experiences conformational changes upon surface adsorption of molecules, ...
Jeong J, Jeon H, Ko K, Chung B, Choi G (2012). "Production of anhydrous ethanol using various PSA (Pressure Swing Adsorption) ... Pressure swing adsorption. Pure ethanol and alcoholic beverages are heavily taxed as psychoactive drugs, but ethanol has many ...
Plasma change the adsorption/desorption equilibrium on the catalyst surface leading to higher adsorption capabilities. An ... Higher adsorption probability. Change in the catalyst oxidation state. Some metallic catalyst (e.g. Ni, Fe) are more active in ...
This type of adsorption system is therefore functionally a nitrogen scrubber leaving the other atmospheric gases to pass ... To meet that need, another process, called vacuum swing adsorption (VSA), has been developed by Air Products. This process uses ... Two methods in common use are pressure swing adsorption and membrane gas separation. Home medical oxygen concentrators were ... Ruthven, Douglas M.; Shamsuzzman Farooq, Kent S. Knaebel (1993). Pressure Swing Adsorption. Wiley-VCH. p. 6,304. ISBN 978-0-471 ...
This filter is made up of silicate granules called zeolite which attract (via adsorption) nitrogen molecules onto their ... United States Grant US4477264A, "Pressure swing adsorption process for a medical oxygen generator for home use", published 16 ... Sircar, Shivaji (2002). "Pressure Swing Adsorption". Ind. Eng. Chem. Res. 41 (6): 1389-92. doi:10.1021/ie0109758. ... pressure swing adsorption. The basic set up of a POC is a miniaturized air compressor, a cylinder filled containing the sieve, ...
Fehime Cakicioglu-Ozkan; Semra Ulku (January 2005). "The effect of HCl treatment on water vapor adsorption characteristics of ... Semra Ülkü (1986). "Adsorption heat pumps". Journal of Heat Recovery Systems. 6 (4): 277-284. doi:10.1016/0198-7593(86)90113-X ... Semra Ülkü (1993). Novel Application of Adsorption: Energy Recovery. Studies in Surface Science and Catalysis. 80. pp. 685-693 ... by adsorption on silk fibroin". Separation and Purification Technology. 62 (2): 342-348. doi:10.1016/j.seppur.2008.01.022. hdl: ...
In pressure swing adsorption the raffinate refers to the gas which is not adsorbed during the high pressure stage. The species ... Ruthven, Douglas M.; Shamsuzzman Farooq, Kent S. Knaebel (1993). Pressure Swing Adsorption. Wiley-VCH. p. 1. ISBN 9780471188186 ...
... adsorption and surface chemistry; chemistry of water purification; transport of metals and other substances in water; and water ...
Adsorption 4:3-4. (1998) A. Kundu, K. Barnthouse, and S. M. Cramer. Biotech. and Bioeng., 56:119-129. (1997) KA. Kundu, A. A. ... Displacement development in adsorption analysis. Ark. Kemi. Mineral Geol. 16A: 1-18 (1943). G. T. Seaborg. The Transuranium ... the salt-dependent adsorption behavior of these low MW displacers greatly facilitates column regeneration. These displacers ...
Diffusion and adsorption processes. Characterization of compounds. Study of biological interest substances. Study of optical ...
In this approach, a liquid extractant is contained within the pores of (adsorption) particles. Usually, the extractant is an ... The basic principle combines adsorption, chromatography and liquid-liquid extraction. The principle of Solvent Impregnated ... Adsorption 14: 357-366. Babic, K.; van der Ham, L.; de Haan, A. (2006). "Recovery of benzaldehyde from aqueous streams using ... "Expansion of adsorption isotherms into equilibrium surface Case 1: solvent impregnated resins (SIR)." React. Funct. Polym. 48 ...
"Measurement of Adsorption Isotherms". Physics and Chemistry of Interfaces. Weinheim: Wiley-VCH, 2006. 206-09. Tompkins, Harland ... Ellipsometric porosimetry measures the change of the optical properties and thickness of the materials during adsorption and ...
... adsorption, catalysis and electrochemistry; interfacial processes, capillarity and wetting; biomaterials and nanomedicine; and ...
Defay, R. & Prigogine, I. (1966). Surface tension and adsorption. Longmans, Green & Co. LTD. Glansdorff, Paul; Prigogine, I. ( ...
Distribution of adsorption energies and odd adsorption sites. Bonds formed between the adsorbates. Compared to physisorption ... As an instance of adsorption, chemisorption follows the adsorption process. The first stage is for the adsorbate particle to ... Adsorption Physisorption Oura, K.; Lifshits, V.G.; Saranin, A.A.; Zotov, A.V.; Katayama, M. (2003). Surface Science, An ... Chemisorption is a kind of adsorption which involves a chemical reaction between the surface and the adsorbate. New chemical ...
... adsorption and ion exchange; gas-solid, liquid-solid and solid-solid operations; biochemical engineering; waste management, ...
Polymer adsorption[edit]. Main article: polymer adsorption. Adsorption of molecules onto polymer surfaces is central to a ... Portal site mediated adsorption[edit]. Portal site mediated adsorption is a model for site-selective activated gas adsorption ... Polymers may also be adsorbed to surfaces through polyelectrolyte adsorption. Adsorption in viruses[edit]. Adsorption is the ... Adsorption enthalpy[edit]. Adsorption constants are equilibrium constants, therefore they obey the van t Hoff equation: (. ∂. ...
Common multi-word phrases that nearly rhyme with adsorption: 10 letters:. bad person, fat person Some other possibilities:. ...
... or colours is adsorption by activated carbon. Adsorption is the capacity of a solid particle to attract molecules to its ... Carbon adsorption: An effective method for removing dissolved organic substances that cause tastes, odours, ... Other articles where Carbon adsorption is discussed: water supply system: ... Adsorption is the capacity of a solid particle to attract molecules to its surface. Powdered carbon mixed with water can adsorb ...
The Ea values of these compounds have appeared to be several times lower than the heats of their adsorption on carbon black ... Standard Test Method for Carbon Black-Iodine Adsorption Number. Intr. 1998. PA, USA: ASTM Int., 2013.Google Scholar ... It has been shown that sulfur present in schungite has no effect on the results of determining its adsorption activity and does ... The influence of these compounds on the adsorption activity of schungite with respect to iodine has been investigated. ...
We determine the adsorption energy per adsorbate, , as the difference in total energies of the full system and each fragment ... Included is the adsorption energy , the distance of the methanol O atom from graphene, , the adsorption configuration (C-O axis ... By use of the first-principles vdW-DF method, we calculate adsorption energies and determine adsorption geometries of methanol ... and thus the adsorption properties of methanol affect the adsorption of the other molecule. Gaining access to detailed ...
Adsorption in clusters or at high coverages (less than a monolayer) is found to be preferable, with the methanol C-O axis ... The adsorption energies calculated with vdW-DF are compared with previous DFT-D and MP2-based calculations for single methanol ... Methanol Adsorption on Graphene. Elsebeth Schröder Microtechnology and Nanoscience (MC2), Chalmers University of Technology, ... The adsorption of a single methanol molecule and small methanol clusters on graphene is studied at various coverages. ...
... 2002-01-2345. A dynamic simulation of the ISS CDRA hardware was created using ... Citation: Anderson, M. and Jeng, F., "Adsorption Modeling with ACM: ISS CDRA Simulation," SAE Technical Paper 2002-01-2345, ...
An adsorption apparatus and method of adsorption for treatment of wastewater is disclosed, and comprises an inlet for the ... Adsorption system. 2005-04-28. Parke. 6811703. Methods for adsorption and retention of solvated compounds and ions. 2004-11-02 ... 2. The adsorption apparatus of claim 1 wherein said predetermined size is about 5 microns or greater. 3. The adsorption ... An adsorption apparatus and method of adsorption for treatment of wastewater is disclosed, and comprises an inlet for the ...
506g) Preparation and Its Excellent CO2/CH4/N2 Adsorption Selectivity of Novel Carbon Composites [email protected] ... 506a) CO2 Extraction from Simulated Air Via Temperature Swing Adsorption Using Polymer/Silica Fiber Sorbents ...
... ,ARUP Laboratories is a national reference laboratory and a worldwide leader in innovative laboratory ...
687c) Adsorption of 5-Hydroxymethyl-Furfural (HMF) From Liquid Water/Dimethyl Sulfoxide (DMSO) Solutions Onto Hydrophobic ... This session presents the most recent advances in the molecular simulations of adsorbents, adsorption phenomena, molecular ... 687i) Investigation of the Critical Point of Adsorption of Polymer Chains On Porous Adsorbents ...
Portal site mediated adsorption. Portal site mediated adsorption is a model for site-selective activated gas adsorption in ... Adsorption of viruses. When a virus infects a cell, the first step is adsorption of the viral particle (virion) on the cell ... Langmuir suggested that adsorption takes place through this mechanism: , where A is a gas molecule and S is an adsorption site ... Isotherms: Quantification of adsorption. Adsorption may be described quantitatively by the use of isotherms. An isotherm shows ...
Polymer adsorptionEdit. Main article: polymer adsorption. Adsorption of molecules onto polymer surfaces is central to a number ... Portal site mediated adsorptionEdit. Portal site mediated adsorption is a model for site-selective activated gas adsorption in ... Adsorption enthalpyEdit. Adsorption constants are equilibrium constants, therefore they obey the van t Hoff equation: (. ∂. ln ... as the fraction of the adsorption sites occupied, in the equilibrium we have: K. =. k. k. −. 1. =. θ. (. 1. −. θ. ). P. ,. {\ ...
... combined the adsorption advantages of RGO and 2-Hydroxypropyltrimethyl ammonium chloride chitosan (HACC). The adsorption... ... The adsorption and desorption of HACC-RGO/CS beads for MO were studied. After three adsorption-desorption cycles, the ... The removal ratios of HACC-RGO sheets reached 92.6% for MO after a 24 h adsorption. The adsorption kinetics, isotherms and ... Lu X, Wang F, Li X, et al. Adsorption and Thermal Stabilization of Pb2+ and Cu2+ by Zeolite[J]. Industrial & Engineering ...
Carbon nanomaterials for gas adsorption. [M L Terranova; Silvia Orlanducci; Marco Rossi, Ph. D.;] -- The increasing interest ... 7. Modeling gas adsorption on carbon nanotubes / Amanda S. Barnard --. 8. Atomistic simulation of gas adsorption in carbon ... Modeling gas adsorption on carbon nanotubes / Amanda S. Barnard -- 8. Atomistic simulation of gas adsorption in carbon ... Carbon nanomaterials for gas adsorption. Author:. M L Terranova; Silvia Orlanducci; Marco Rossi, Ph. D.. ...
Method for thermal swing adsorption and thermally-enhanced pressure swing adsorption Patent Wegeng, Robert S. ; Rassat, Scot D. ... Apparatus for thermal swing adsorption and thermally-enhanced pressure swing adsorption Patent Wegeng, Robert S. ; Rassat, Scot ... Novel methods of thermal swing adsorption and thermally-enhanced pressure swing adsorption are also described. In some aspects ... Novel methods of thermal swing adsorption and thermally-enhanced pressure swing adsorption are also described. In some aspects ...
activated carbon adsorbed adsorption isotherm adsorption system adsorptive capacity afterburner application backwash batch bed ... Activated Carbon Adsorption For Wastewater Treatment. Jerry. R. Perrich. Limited preview - 2018. ... system breakthrough bulk density carbon adsorption carbon bed carbon column carbon exhaustion rate carbon system carbon ... gb-gplus-shareActivated carbon adsorption for wastewater treatment. ...
Gas phase contaminant removal processes based on adsorption are used for: indoor air cleaning, cabin air purification, odor ... Most adsorption models can be applied successfully to explain single component adsorption at low concentrations. For ... The influence of the humidity on the binary component adsorption of various components; 3. Adsorption of a trace gas component ... However the adsorption of these compounds on activated carbon does not behave differently than the other tested compounds. 2. ...
The adsorption of n-hexane in a silicalite-1 film developed from seeds and found that the saturation capacity was in superior ... A thorough facts of the adsorption is basic in all these applications. In the present work, two systems that have been widely ... Several groups have studied the n-hexane/MFI system, and an inflection in the adsorption isotherm has been reported at a ... 0.7 mmol/g, corresponding to about half the saturation loading [1,2]. The inflection was credited to adsorption on dissimilar ...
Adsorption of water at TiO2 planes, dissociative vs molecular water adsorption. U.S. Pat. No. 4,269,170, "Adsorption solar ... At the maximum adsorption, only a monolayer is formed. Adsorption only occurs on localized sites on the surface, not with other ... As an adsorption chiller requires no compressor, it is relatively quiet. Portal site mediated adsorption is a model for site- ... The adsorption of ensemble molecules on a surface or interface can be divided into two processes: adsorption and desorption. If ...
Pressure swing adsorption (PSA) separation of a gas mixture is performed in an apparatus with a plurality of adsorbent beds. ... Xebec Adsorption Inc.. Rapid cycle syngas pressure swing adsorption system. US7833311. Mar 6, 2008. Nov 16, 2010. Idatech, Llc ... Gas adsorption and desorption method. US5328503. Mar 25, 1993. Jul 12, 1994. Air Products And Chemicals, Inc.. Adsorption ... A pressure swing adsorption apparatus 1 is operated in a pressure swing adsorption cycle at an cyclic frequency characterized ...
... 5 pages•Published: May 14, 2020. Trong Lam Pham, Van On Vo ... Keyphrases: Adsorption, Cancer Detection, Computational Physics, Silicene, volatile organic compound. In: Tich Thien Truong, ... It is found that the adsorption energies of the VOCs in question vary in the range of 0.6-1.0 eV, which indicates that silicene ... The adsorption energy profiles were calculated by three approximations of van der Waals interaction: revPBE-vdW, optPBE-vdW, ...
The plant is based on a novel design using pressure swing adsorption technology and is sized to fit on a standard shield car or ... Mining Publication: Use of Pressure Swing Adsorption Technology to Inert Sealed Mine Areas with Nitrogen. Keywords: Nitrogen ...
The H2S adsorption characteristic of ZnO nanoparticles has also been assayed. ... Prasad, K. and K. Jha, A. (2009) ZnO Nanoparticles: Synthesis and Adsorption Study. Natural Science, 1, 129-135. doi: 10.4236/ ... Haimour, N., El-Bishtawi, R. and Ail-Wahbi, A. (2005) Equilibrium adsorption of hydrogen sulfide onto CuO and ZnO. Desalination ...
Adsorption 17, 421-429. DOI: 10.1007/s10450-010-9271-9. 2. Choi, K.J., Kim, S.G. & Kim, S.H. (2008). Removal of antibiotics by ... LITERATURE CITED 1. Ania, C.O., Pelay o, J.G. & Bandosz, T. J. (2011). Reactive adsorption of penicillin on activated carbons. ... Adsorption of sulfur dioxide on volcanic ashes Deborah SchmauSS1 anD hanS Keppler1,* 1Bayerisches Geoinstitut, Universität ... Elsevier B.V. 2. Saha, D. & Grappe, H.A. (2017). Adsorption properties of activated carbon fibers. Activated Carbon Fiber and ...
Get the latest activated carbon adsorption news , the worlds largest environmental industry marketplace and information ... activated carbon adsorption News. Related terms for "activated carbon adsorption ": activated carbon news , carbon adsorption ... it has an enormous surface area of miscroscopic pores which boast excellent adsorption capabilities. These adsorption ... Activated Carbon Adsorption System tackles MIB & Geosmin UMI-2000 worked with the Engineering firms from grant application for ...
Selective adsorption is the effect when minima associated with bound-state resonances occur in specular intensity in atom- ... The selective adsorption binding energies can supply information on the gas-surface interaction potentials by yielding the ...
H2O Adsorption on WO3 and WO3-x (001) Surfaces.. Albanese E1, Di Valentin C1, Pacchioni G1. ... In this work, we investigate water adsorption and dissociation on both clean and O-deficient (001) WO3 surfaces by means of an ... Contrary to what is usually expected, the presence of oxygen vacancies does not significantly affect H2O adsorption. Finally, ...
Shortening of Pseudomonas aeruginosa pili after RNA-phage adsorption.. Bradley DE.. PMID:. 4627885. DOI:. 10.1099/00221287-72-2 ...
Activated Carbon Adsorption and the Environment: Removal of Inorganics from Wastewater. Activated Carbon Adsorption and the ... Adsorption Energetics, Models, and Isotherm Equations. Activated Carbon Adsorption from Solutions. Carbon Molecular Sieves. ... Activated Carbon Adsorption introduces the parameters and mechanisms involved in the activated carbon adsorption of organic and ... and the applicability of adsorption isotherm equations and their deviation from adsorption data. It then explores numerous ...
  • This session presents the most recent advances in the molecular simulations of adsorbents, adsorption phenomena, molecular recognition, adsorption properties and parameters, and mass transfer kinetics and properties. (
  • The adsorption kinetics, isotherms and thermodynamics were investigated to indicate that the kinetics and equilibrium adsorptions were well-described by pseudo-second-order kinetic and Freundlich isotherm model, respectively. (
  • The effectiveness of protein adsorptions is influenced by rate of delivery of proteins to sublayer of the glass slide as well as adsorption kinetics. (
  • The Langmuir isotherm is nonetheless the first choice for most models of adsorption, and has many applications in surface kinetics (usually called Langmuir-Hinshelwood kinetics ) and thermodynamics. (
  • The focus of the first part of the thesis was primarily on formation and characterization of PECs in solution, whereas the adsorption properties and adsorption kinetics of bottle-brush polyelectrolytes and their complexes was investigated in the second part of the thesis work. (
  • This book covers topics of equilibria and kinetics of adsorption in porous media. (
  • Kinetics data were found to follow the pseudo-second-order kinetic model while the adsorption data corresponded to L-shape adsorption isotherm which corresponds to the classification of Giles. (
  • Here, we studied the kinetics of CO2 adsorption on regularly sized zeolite NaKA and on nano-sized zeolite NaKA. (
  • The apparently slow adsorption kinetics of CO2 on nano-sized zeolite NaKA was more difficult to explain because it could relate to imperfections within the small crystals, remaining water, or other effects. (
  • Contrary to previous reports, hydrogen adsorption in MOF-5 mixed/modified with Pt catalysts had fast kinetics, correlated well with surface area, and was on the same level as for unmodified MOF-5. (
  • For the high coverage adsorption energies, we also find reasonably good agreement with previous desorption measurements. (
  • The adsorption and desorption of HACC-RGO/CS beads for MO were studied. (
  • Gas adsorption/desorption is an essential process related to gas transport in fractured organic rocks, such as coals and organic-rich shales. (
  • This performance improved substantially when the CO{sub 2}-HTlc adsorption and desorption mass transfer coefficients (uncertain quantities at this time) were increased by factors of five, with a CO{sub 2} purity of 90.3%, a CO{sub 2} recovery of 73.6%, and a throughput of 34.6 L STP/hr/kg. (
  • A novel method for the detection of composition differences on solid surfaces is based on differences in the adsorption and subsequent partial desorption of a radiotracer by heterogeneities of the surface. (
  • We have probed the adsorption property of single-wall carbon nanotube (SWNT) bundles using the temperature-programmed desorption technique. (
  • Adsorption is usually described through isotherms , that is, the amount of adsorbate on the adsorbent as a function of its pressure (if gas) or concentration (if liquid) at constant temperature. (
  • The adsorption of gases and solutes is usually described through isotherms, that is, the amount of adsorbate on the adsorbent as a function of its pressure (if gas) or concentration (for liquid phase solutes) at constant temperature. (
  • Adsorption, not to be confused with absorption, is a process by which a gas , liquid , or solute (substance in solution) binds to the surface of a solid or liquid (called the adsorbent ), forming a film of molecules or atoms (called the adsorbate ). (
  • For example, activated carbon , the most common adsorbent, is used for the adsorption of organic substances and nonpolar adsorbates, and for waste gas and wastewater treatment. (
  • Adsorption is a consequence of attractive interactions between the surface of the adsorbent and the species being adsorbed. (
  • The degree of adsorption is influenced by certain properties of the adsorbent and adsorbate, and conditions such as temperature and pressure. (
  • Despite the development of various new adsorption media used for the removal of some specific gases and vapors, activated carbon remains the choice adsorbent in many applications because of its good adsorption efficiency for a wide range of gases and vapors and because of its reduced cost. (
  • Experimental studies on the adsorption of mixtures on activated carbon are limited because of the difficulties in obtaining data for different concentrations in various mixture/adsorbent systems. (
  • Pressure swing adsorption (PSA) separation of a gas mixture is performed in an apparatus with a plurality of adsorbent beds. (
  • Then the concentration of the adsorbate inside and outside the adsorbent is compared to determine if the the adsorption is negative or positive. (
  • Adsorption is a process that occurs when a gas or liquid solute accumulates on the surface of a solid or a liquid (adsorbent), forming a film of molecules or atoms (the adsorbate ). (
  • The surface of the adsorbent is uniform, that is, all the adsorption sites are equivalent. (
  • At the maximum adsorption, only a monolayer is formed: molecules of adsorbate do not deposit on other, already adsorbed, molecules of adsorbate, only on the free surface of the adsorbent. (
  • The concept of "adsorption" was recommended by Kayser in 1881 to explain the growth in concentration of gas molecules on the adjacent surface of a solid adsorbent, an effect previously noted by Fontana and Scheele in 1777 [ 1 ]. (
  • Meanwhile, the adsorption characteristics of Cr(VI) onto the adsorbent in aqueous solutions was studied as a function of solution pH, ionic strength, contact time, and temperature. (
  • The results showed that Cr(VI) adsorption onto the adsorbent is strongly dependent on pH and, to a lesser extent, ionic strength. (
  • High surface area, a microporous structure, and a high degree of surface reactivity make activated carbons versatile adsorbents, particularly effective in the adsorption of organic and inorganic pollutants from aqueous solutions. (
  • The adsorption of binary mixture (N2-HgCl2) is simulated in both types of micropores adsorbents at different HgCl2 concentrations ranging from 5000 ppbv to 10 ppbv in the temperature range of 100 to 180 C. Finally, the selectivity of HgCl2 with respect to N2 is discussed in zeolite-X and as a function of pore size, acid sites concentrations and their relative positions within pore in the case of activated carbon. (
  • Topics covered by the Workshop include recent theoretical and experi mental developments on environmental adsorption, adsorption processes, as well as synthesis and tailoring of novel adsorbents, including the assessment of materials and processes. (
  • The invited lectures provided a comprehensive report on adsorption and colloids, carbon materials and adsorbents for various industrial applications, and ecological safety and antiterrorism. (
  • The adsorptive media addressed include granular activated carbon and other alternative adsorption carbon media, such as powdered activated carbon (PAC) and non-carbon adsorbents. (
  • Carbon dioxide removal from flue gas via swing adsorption processes requires adsorbents with a high CO2 selectivity and capacity. (
  • It is recognized, however, that industrial adsorption processes require pelletized rather than powdered adsorbents. (
  • Adsorption, ion exchange and chromatography are sorption processes in which certain adsorbates are selectively transferred from the fluid phase to the surface of insoluble, rigid particles suspended in a vessel or packed in a column. (
  • Papers on novel materials and processes for CO2 capture using adsorption. (
  • Gas phase contaminant removal processes based on adsorption are used for: indoor air cleaning, cabin air purification, odor removal, personal protective equipment (respirators impregnated clothing), and various air sampling devices. (
  • This text brings together the most significant research on surface structure and processes, adsorption theories and isotherm equations, and applications from the latest literature on carbon adsorption. (
  • Activated Carbon Adsorption presents a complete survey of the growing number of state-of-the-art applications supported by a compilation of the latest perspectives in research concerning carbon surfaces and their adsorption processes from aqueous solutions. (
  • The lecture covers the whole bandwidth of adsorption processes in gas and liquid phase with a focus on industrial applications. (
  • The NATO Advanced Research Workshop on RecentAdvancesin Adsorption Processes for Environmental Protection and Security was held during, September 9-12, 2006, at Hotel Salyut, Kiev, Ukraine. (
  • The purpose of the Workshop was to bring together researchers and en gineers working in adsorption related fields, to share knowledge on the latest advances on adsorption processes for environmental security and protection, as well as to cross link and disseminate to the scientific community the main results and achievements of recent NATO SfP projects on environmental security and protection. (
  • Overall, the CO2 adsorption rates on zeolite NaKA crystals of different sizes were fast and relevant for the time scales required for adsorption based CCS processes, such as vacuum and temperature swing adsorption (VSA/TSA). (
  • The adsorption of polymers to surfaces is crucial for understanding many fundamental processes in nature. (
  • This paper highlights the potential of pelletized forms of mesoporous silica and branched polyethyelenimine composites (MCF-PEIs), as prepared via a patent pending pelletization process, to provide a viable option to facilitate post combustion CO2 capture via adsorption processes. (
  • Selective adsorption is the effect when minima associated with bound-state resonances occur in specular intensity in atom-surface scattering. (
  • The selective adsorption binding energies can supply information on the gas-surface interaction potentials by yielding the vibrational energy spectrum of the gas atom bound to the surface. (
  • The combination of a simple inexpensive synthesis approach and high selective adsorption make these materials potential candidates for CO 2 storage, selective gas adsorption, and other environmental applications. (
  • Zeolite NaKA was studied for its ability to selectively adsorb CO2 from flue gas, as we previously observed that zeolite NaKA, with a K+/(K+ + Na+) ratio of 17 atomic%, was highly selective towards CO2 over N-2 adsorption by tuning the size of the pore window apertures [1]. (
  • Nitrogen generation by Pressure Swing Adsorption (PSA) process is a technology used to separate nitrogen from a mixture of gases under pressure according to the special selective adsorption characteristics of the Carbon Molecular Sieves (CMS). (
  • Imprinted Nanoporous Organosilicas for Selective Adsorption of Nitroenergetic Targets, Langmuir. (
  • The Li+ selective adsorption behaviors of the MnO2 nanorod ion-sieve are improved remarkably compared to those prepared via the conventional solid-state reaction, which is promising for lithium extraction from aqueous solution including brine, seawater and waste water. (
  • The adsorption process is generally classified as either physisorption (physical adsorption) or chemisorption (chemical adsorption). (
  • At low adsorption coverage, it is shown that the chemical adsorption of hydrogen atoms causes a GNR to bend away from the adsorbed atoms while the physical adsorption of hydrogen molecules causes it to bend toward the adsorbed molecules. (
  • H2O Adsorption on WO3 and WO3-x (001) Surfaces. (
  • H 2 O Adsorption on WO 3 and WO 3-x (001) Surfaces. (
  • In this work, we investigate water adsorption and dissociation on both clean and O-deficient (001) WO 3 surfaces by means of an accurate DFT approach. (
  • Reliable simulation of molecular adsorption onto cellulose surfaces is essential for the design of new cellulose nanocomposite materials. (
  • In this study, we present the adsorption of glucose, cellobiose, and cellotetraose on model surfaces of crystalline cellulose Iα and Iβ. (
  • Using Embedded-atom-method (EAM) potential, we have performed in detail molecular dynamics studies on a Fe adatom adsorption and diffusion dynamics on three low miller index surfaces, Fe (110), Fe (001), and Fe (111). (
  • Our results present that adatom adsorption energies and diffusion barriers on these surfaces have similar monotonic trend: adsorption energies, E a (110) E a (001) E a (111), diffusion barriers, E d (110) E d (001) E d (111). (
  • These surfaces are typically used for the adsorption of hydrophobic molecules such as lipid-rich biomolecules. (
  • The adsorption of insulin on a variety of surfaces has become the focus of numerous studies lately. (
  • Here we spectroscopically investigate the adsorption of insulin at lipid monolayers, to further our understanding of the interaction of insulin with biological surfaces. (
  • Brunauer, Emmett and Teller's model of multilayer adsorption is a random distribution of molecules on the material surface. (
  • Adsorption is the adhesion of atoms , ions or molecules from a gas, liquid or dissolved solid to a surface . (
  • Note 2: Adsorbed molecules are those that are resistant to washing with the same solvent medium in the case of adsorption from solutions. (
  • Adsorption is the capacity of a solid particle to attract molecules to its surface. (
  • In experiments where molecules are adsorbed on graphite, methanol is often used as a solvent for the larger molecules at target, and thus the adsorption properties of methanol affect the adsorption of the other molecule. (
  • Gaining access to detailed adsorption data for methanol on graphite, such as positions and energetics like those provided here, is thus valuable both directly and as input data for larger simulations of molecules on graphite embedded in the (methanol) solvent. (
  • Adsorption and binding of capping molecules for highly luminescent CdSe nanocrystals--DFT simulation studies. (
  • We investigate bending behaviors of graphene nanoribbons (GNRs) induced by surface adsorption of hydrogen atoms or molecules. (
  • The broad spectrum of immune responses elicited coupled with the attendant benefits of safety suggest that spore adsorption could be appropriate for improving the immunogenicity of some vaccines as well as the delivery of biotherapeutic molecules. (
  • Topics receiving special attention in this book include storage of H, purification of H, storage of rare gases, adsorption of organic vapors, gas trapping and separation, and metrology of gas adsorption. (
  • There are virtually no experimental data on adsorption of mixtures of gases and vapors having very different properties such as toluene and sulfur dioxide, despite the fact that some respirator cartridges are explicitly marketed for "organic vapors and acid gases The scope of the research conducted in this study was to investigate multi-component adsorption on activated carbon focusing on: 1. (
  • The models obtained from this study will allow determine the safe sampling period for mixtures of gases and vapors, including water vapors, from the adsorption isotherms of pure compounds. (
  • Adsorption of single component gases and vapors under dry and/or normal conditions: toluene, ethanol, sulfur dioxide, dichlormethane. (
  • Three chapters are dedicated to environmental applications, including the adsorption of halogenated organic compounds and the removal of hazardous gases and vapors, organo-sulphur compounds, and other inorganic compounds from wastewater and groundwater. (
  • Activated Carbon Adsorption and Environment: Removal of Hazardous Gases and Vapors. (
  • The object of the present work has been to study the adsorption of hydrocarbon vapors on various types of clays, and to learn from this adsorption study the relative importance of various factors, both chemical and physical, which determine the adsorptive phenomena. (
  • The adsorption energies and orientation of methanol on graphene are determined from first-principles density functional calculations. (
  • The adsorption energies calculated with vdW-DF are compared with previous DFT-D and MP2-based calculations for single methanol adsorption on flakes of graphene (polycyclic aromatic hydrocarbons). (
  • Previously, the adsorption energies of methanol from graphene or flakes of graphene were calculated [ 7 ] by the semiempirical theory method DFT-D [ 8 ]. (
  • It is found that the adsorption energies of the VOCs in question vary in the range of 0.6-1.0 eV, which indicates that silicene is considerably sensitive with these VOCs. (
  • To validate this approach, quantum theoretical calculations for the adsorption of glucose were performed: Equilibrium geometries were studied with density functional theory (DFT) and dispersion-corrected DFT, whereas the adsorption energies were calculated with two standard density functional approximations and five dispersion-containing DFT approaches. (
  • We find that GLYCAM06 gives a good account of geometries and, in most cases, accurate adsorption energies when compared to dispersion-corrected DFT energies. (
  • Especially for bigger adsorbates, a neglect of these interactions leads to a dramatic underestimation of adsorption energies. (
  • We find that for weak adsorption energies the adsorption timescales ~N(1+2v)/(1+v), where nu is the Flory exponent for the polymer. (
  • Surprisingly, for high adsorption energies the adsorption time becomes longer, as it scales as ~N1+v, which is explained by strong stretching of the unadsorbed part of the polymer close to the adsorbing surface. (
  • The computationally obtained potential behavior based on the adsorption theory was in good agreement with the experimentally observed potential whether the membrane (or separator) was permeable to ions or not. (
  • It was strongly speculated that the membrane potential origin could lie primarily in the ion adsorption on the membrane (or separator) rather than the membrane permeability to ions. (
  • It was shown that in both cases the adsorption process could be interpreted in terms of Kroeker adsorption isotherm regardless to the presence of other ions in the groundwater. (
  • Adsorption of Cu(II) and Zn(II) ions from metallurgical solutions has been studied and the adsorption capacity of zeolite (Nižný Hrabovec, SK) has been determined. (
  • Adsorption methods were found to be more effective and attractive due to its lower costs and the higher efficiency of heavy metal ions removal from wastewater [10]. (
  • However, there is an ongoing effort to improve the understanding of the adsorption mechanism on activated carbon, taking into account the many parameters, which influence this process. (
  • In this work, we investigated the adsorption mechanism of some small-to-medium VOCs on the surface of silicene by the quantum simulation method. (
  • Simple mass transfer models were applied to the experimental data to examine the adsorption mechanism and it was found that both external mass transfer and intraparticle diffusion played important roles in the adsorption mechanisms. (
  • Our results demonstrate that molecular diffusion plays important roles in the early stage of protein adsorption dynamics which shifts to a kinetic controlled mechanism in the later stage. (
  • Exploration on the adsorption mechanism of aminopyrimidines and q. (
  • Combined with computer simulations, π-π stacking was identified as the dominant mechanism for adsorption onto graphene oxide. (
  • All adsorption occurs through the same mechanism. (
  • Langmuir suggested that adsorption takes place through this mechanism: A (g) + S Template:Unicode AS, where A is a gas molecule and S is an adsorption site. (
  • Adsorption on Activated Carbon: One Underlying Mechanism? (
  • Activation thermodynamic parameters, such as activation enthalpy (Δ H *), activation entropy (Δ S *), activation Gibbs free energy (Δ G *) and activation energy (E), have been evaluated and the possible adsorption mechanism also was suggested. (
  • The possible adsorption mechanism of the adsorption process also was suggested. (
  • Anderson, M. and Jeng, F., "Adsorption Modeling with ACM: ISS CDRA Simulation," SAE Technical Paper 2002-01-2345, 2002, . (
  • In the present research study, we make an attempt to understand the physical adsorption of mercuric chloride and mixture of mercuric chloride and nitrogen in zeolite-X and activated carbon through detailed Monte-Carlo simulations and computational quantum chemistry techniques. (
  • 2016). 'Modelling of copper and zinc adsorption onto zeolite', Metalurgija , 55(4), str. (
  • Pavolová H, Khouri S, Cehlár M, Domaracká L, Puzder M. Modelling of copper and zinc adsorption onto zeolite. (
  • According to the results of the experiments the adsorption equilibrium of Cu(II) and Zn(II) on zeolite was best described by Freundlich isotherm. (
  • The experimental results of this study demonstrate that zeolite is suitable for adsorption of copper and zinc from aqueous solutions at low concentrations. (
  • Nano-sized zeolite NaKA were synthesised and studied to improve the rate of CO2 adsorption, as the diffusion rate typically increases quadratically with decreasing particle size. (
  • The influence of these compounds on the adsorption activity of schungite with respect to iodine has been investigated. (
  • The E a values of these compounds have appeared to be several times lower than the heats of their adsorption on carbon black calculated by the molecular-statistical method. (
  • However the adsorption of these compounds on activated carbon does not behave differently than the other tested compounds. (
  • Activated Carbon Adsorption introduces the parameters and mechanisms involved in the activated carbon adsorption of organic and inorganic compounds. (
  • Activated Carbon Adsorption and the Environment: Adsorptive Removal of Organic Compounds. (
  • Several insoluble compounds including imatinib, nilotinib, erlotinib, gefitinib, and afatinib were selected for loading and in vitro graphene oxide release assays to study the non-covalent adsorption mechanisms. (
  • in the present study the adsorption of two organic compounds found in human sebum by illitic, kaolinitic, and chloritic phyllosilicates was investigated. (
  • The influence of the removal of these compounds on the adsorption properties of illitic clays was also investigated. (
  • Some compounds, such as ketones, may cause carbon bed fires because they release heat upon adsorption. (
  • Adsorption studies showed that increasing the soil organic matter content increases the adsorption of TCS and EE2 on these substrates and that both compounds follow the Freundlich adsorption model. (
  • Equilibrium data fitted well to the Langmuir and Redlich-Peterson models in the concentration and temperature ranges investigated, with a maximum adsorption capacity of 14 mg g−1. (
  • Hydrogen adsorption properties of well-known MOF-5 were studied at near ambient temperature and hydrogen pressures up to 120 bar. (
  • The 4 He adsorption vs. pump-out temperature on SWNT samples and on charcoal was obtained. (
  • While the 4He adsorption was not sensitive on the addition temperature on charcoal, it was different on SWNT samples. (
  • Silica gel is used for drying gases and adsorption of heavy (polar) hydrocarbons from natural gas. (
  • In such a context, research in adsorption of gases by carbon nanomaterials has experienced considerable growth in recent years, with increasing interest for practical applications. (
  • Xe in smaller quantity (6% level) than 4 He and H 2 , suppressed the adsorption of other gases to the background level. (
  • Irving Langmuir was the first to derive a scientifically based adsorption isotherm in 1918. (
  • Besides, the concepts that define physical adsorption and examples of adsorption data, which were tested with the help of the Dubinin, osmotic adsorption and Langmuir-type isotherms, were defined. (
  • The exact nature of the bonding depends on the details of the species involved, but the adsorption process is generally classified as physisorption (characteristic of weak van der Waals forces ) or chemisorption (characteristic of covalent bonding). (
  • Hydrogen adsorption for the samples with added catalyst showed correlation with BET surface area, exhibited isotherms typical for physisorption and no features which could be assigned to spillover effect. (
  • Prasad, K. and K. Jha, A. (2009) ZnO Nanoparticles: Synthesis and Adsorption Study. (
  • Here, we present data on the formation of silica-lysozyme composites through two different synthesis approaches (co-precipitation vs. adsorption) and show that the chemical and structural properties of these composites, when analyzed using a combination of synchrotron-based scattering (total scattering and small-angle X-ray scattering), spectroscopic, electron microscopy, and potentiometric methods vary dramatically. (
  • We investigate the adsorption of a single polymer of length N to a planar solid surface in the absence of hydrodynamic interactions. (
  • Note 1: Adsorption of proteins is of great importance when a material is in contact with blood or body fluids. (
  • Light-induced molecular adsorption of proteins (LIMAP) allows for quantitative sub-micrometer-resolution printing of multiple biomolecules. (
  • Adsorption isotherms indicate that amount of proteins secreted from individual cells and subsequently captured on a clean glass slide surface increases monotonically with time. (
  • Adsorption of proteins onto a glass slide is a dynamic process. (
  • Interestingly, these trends are reversed at high adsorption coverage. (
  • We use atomistic grand-canonical Monte Carlo simulations to study how surface modification of ion-exchanged sulfated cellulose nanocrystals (Na-CNCs) impacts water adsorption. (
  • Finally, the different interaction forces that make possible adsorption were discussed. (
  • The maximum hydrogen adsorption measured on doped MOF-5 was 0.43 wt. (
  • Hydrogen adsorption was measured for a set of Zn- and Co-based MOFs at near ambient temperatures. (
  • Hydrogen adsorption values in the studied MOFs correlated well with surface area and pore volume but did not exceed 0,75wt. (
  • In this thesis the effect of Pt catalyst addition on hydrogen adsorption in MOF-5 was not confirmed. (
  • Most adsorption models can be applied successfully to explain single component adsorption at low concentrations. (
  • In addition, the adsorption kinetic, isotherm and activation thermodynamics were investigated. (
  • The magnitude of delay caused by adsorption, diffusion partitioning, preferential partitioning, and permeability variation were compared. (
  • Diffusion partitioning was shown to have a larger effect on tracer delay than adsorption while preferential partition was shown to have no effect. (
  • Tracer delay was shown to be approximated closely by known permeability variations even when adsorption and diffusion effects are ignored. (
  • Various methods to measure diffusivity, such as the Differential Adsorption Bed (DAB), the time lag, the diffusion cell, chromatography, and the batch adsorber methods are also covered by the book. (
  • Recent experimental studies indicate that the adsorption dynamics is dominated by non-equilibrium effects. (
  • These two dynamic regimes are separated by an energy scale that is characterized by non-equilibrium contributions during the adsorption process. (
  • [2] Adsorption is a surface phenomenon , while absorption involves the whole volume of the material. (
  • Similar to surface tension , adsorption is a consequence of surface energy . (
  • For studies of atmospheric (water) ice formation and interstellar (methanol) ice formation the graphite surface is found to be a suitable model for the particles on which the ice forms [ 3 , 4 ], further motivating our study of methanol adsorption on graphite. (
  • In addition, small pore diameters lead to higher exposed surface area and hence higher capacity for adsorption. (
  • Being carbonacous with a highly complex, uneven structure, it has an enormous surface area of miscroscopic pores which boast excellent adsorption capabilities. (
  • The book clearly explains the surface-related interactions of activated carbons, their energetics, and the applicability of adsorption isotherm equations and their deviation from adsorption data. (
  • My book states the following: When the concentration of the adsorbate is less on the surface relative to its concentration in the bulk, it is called negative adsorption. (
  • The reason is presumably that positive adsorption occurs when the solute has a higher affinity for the sorbent than the solvent (thus causing preferential adsorption of the solute onto the sorbent surface and lowering the concentration of the solute in the solution phase) and negative adsorption occurs when the solvent has a higher affinity for the sorbent than the solute. (
  • Adsorption onto the (100) surface of cellulose Iα is, in general, stronger than onto the (100) surface of cellulose Iβ. (
  • The adsorption theory attributes the membrane potential generation to the ion adsorption onto the membrane (or separator) surface not to the ion passage through the membrane (or separator). (
  • Characterizing the effects of surface functionalization and retention of nanoparticles onto clay minerals due to adsorption under subsurface conditions will be necessary for selecting the types of nanoparticles or surface modification to be used as suitable nanosensors or EOR agents. (
  • The chemical reactivity of the resulting surface was checked by CO adsorption. (
  • The adsorption of CO on the surface is drastically affected by the presence of Pt even for minute traces. (
  • In this work we have discovered that the negatively charged and hydrophobic surface layer of spores provides a suitable platform for adsorption of protein antigens. (
  • During the last years, the authors have synthesized, characterized, and studied the adsorption properties of nitroprussides, Prussian blue analogues, akaganeites, MeAPOs, metal-organic frameworks, and extremely high specific surface amorphous silica, which allowed the storage of about 11 wt. (
  • With purified reagents, a process including surface adsorption and activation of FXII occurred within 1 second. (
  • A novel quaternized-chitosan-modified reduced graphene oxide (HACC-RGO) combined the adsorption advantages of RGO and 2-Hydroxypropyltrimethyl ammonium chloride chitosan (HACC). (
  • Separation of Zr and Nb from aqueous solution by adsorption on glass beads is described. (
  • An adsorption apparatus and method of adsorption for treatment of wastewater is disclosed, and comprises an inlet for the wastewater connected to a metals trap which adsorbs metals and a second trap which filters organic materials from the wastewater, positioned between the inlet and the metals trap, wherein the second trap at least partially comprises either a phosphate or an activated carbon. (
  • Activated Carbon Adsorption and the Environment: Removal of Inorganics from Wastewater. (
  • The need to develop technologies capable of achieving high removal efficiencies for mercury chloride emission control led many researchers to focus their attention on the evaluation of the adsorption capacity and selectivity shown by different solids. (
  • UMI-2000 is the only supplier in the USA of this new Honeycomb Activated Carbon product that will revolutionize vapor phase adsorption applications in industry. (
  • It provides practical guidance for the design of liquid- and vapor-phase devices for the adsorption of organic chemicals. (
  • Adsorption is present in many natural, physical, biological and chemical systems and is widely used in industrial applications such as heterogeneous catalysts , [5] [6] activated charcoal , capturing and using waste heat to provide cold water for air conditioning and other process requirements ( adsorption chillers ), synthetic resins , increasing storage capacity of carbide-derived carbons and water purification . (
  • These data are then available as input to and/or for fine-tuning of molecular dynamics simulations of the methanol adsorption process. (
  • The thermodynamic parameters suggested that the adsorption process was spontaneous and endothermic in nature. (
  • The wave front behavior, i.e., its velocity, length, and shape, reflects the influences of all the variables governing the adsorption process in a packed bed reactor. (
  • Likewise, the adsorption of native FXII from plasma was a rapid process. (
  • This paper provides a rational approach to design of packed bed adsorption reactors based upon materials balance principle, combined with kinetic modeling. (
  • if the adsorption capacity for the individual vapor or gas of a mixture at low concentration is known, what would be its adsorption capacity for the same component when present in a binary mixture of various proportion? (
  • 2. if the adsorption capacity of individual components of a mixture are determined, how can the breakthrough cure be predicted without measurements of the multiple-component system? (
  • Oleic acid and squalene were adsorbed on all clay samples, but illitic and chloritic phyllosilicates showed the greatest adsorption capacity. (
  • Elevated temperatures from soil vapor extraction (SVE) pumps (greater than 38 C or 100 F) inhibit adsorption capacity. (
  • Room air contacting significantly decreased the 4 He adsorption capacity. (
  • In this papere, adsorption properties of the nonionic surfactant Tergitol 15 S-7 on clays are presented. (
  • The presence of carbonate, for example, can cause skin irritation because of its alkaline nature, and iron oxides and hydroxides reduce the adsorption properties of clays. (
  • ten Brink, Karl C.. "Adsorption studies on clays. (
  • This book provides a selected overview of some of the most interesting scientific results regarding the outstanding properties of carbon nanomaterials for gas adsorption and of interest both for basic research and technological applications. (
  • Adsorption is present in many natural physical, biological, and chemical systems, and is widely used in industrial applications such as activated charcoal, synthetic resins, and water purification. (
  • to be exact, gas adsorption offers evidence concerning the mesopore area, volume and size of the pores together with the energetics of adsorption [ 2 ]. (
  • We argue that in this regime the single chain adsorption is closely related to a field-driven polymer translocation through narrow pores. (
  • Still, the CO2 adsorption rate on nano-sized zeolites NaA and NaKA did not increase significantly. (
  • Several groups have studied the n-hexane/MFI system, and an inflection in the adsorption isotherm has been reported at a concentration of ca. 0.7 mmol/g, corresponding to about half the saturation loading [1,2]. (
  • In particular, effects of the side-chain density of the bottlebrush polyelectrolyte, concentration, mixing ratio and molecular weigh of the linearpolyelectrolyte on formation, solution properties, stability and adsorption of PECs were addressed. (
  • Induc¬tively coupled plasma atomic emission spectrometry (ICP-AES) was used for determination of arsenic concentration after adsorption. (
  • Addi¬tionally, the influence of phosphate concentration on adsorption of model arsenic samples was examined and it was shown that (at least in examined range of arsenic and phosphate concentration) there is no sig¬nificant influence of phosphate on adsorption of arsenic. (
  • Many research groups are now producing or using such materials for gas adsorption, storage, purification, and sensing. (
  • Adsorption of gas phase contaminant mixtures. (
  • A number of programming codes written in MatLab language are included so that readers can use them directly to better understand the behavior of single and multicomponent adsorption systems. (
  • In the study [ 7 ] the adsorption of methanol on to very small flakes of graphene-benzene and coronene-was also calculated by the higher-accuracy correlation method second-order Møller-Plesset perturbation theory (MP2). (
  • A recent study assesses the adsorption of mercury by four types of activated carbon and demonstrates that they all provide a permanent means of locking away mercury. (
  • In this project we focus on the use of microfluidic tools to study emulsifier adsorption and emulsion stability. (
  • Our next steps are to gain better understanding of emulsifier transport mechanisms in the microfluidic device, and to apply this method to study the adsorption of food-grade emulsifiers. (
  • The general aim of this study was to evaluate the effects of biosolid application on EE2 and TCS adsorption and bioavailability in soils through testing with wheat plants. (
  • Adsorption has been found to occur in many natural physical, biological, and chemical systems. (
  • Effective Adsorption of Cationic Dyes by Lignin Sulfonate Polymer Based on Simple Emulsion Polymerization: Isotherm and Kinetic Studies[J]. (
  • The enthalpy of atrazine adsorption was evaluated to be 67.8 ± 6.3 kJ mol−l with a Gibbs free energy of -5.7 ± 1.2 kJ mol−1. (