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MoleculesIsothermsDesorptionSurfacesUpon adsorptionCompetitive adsorptionElectrostaticSurfactantBehaviorLangmuirAdsorbentIsothermAtomicPolyelectrolyteDispersion forcesAbsorptionSimulationParticlesProteinCarbonsSimulationsExperimentalOxygenTransitionsMolecularPolymersYoung'sEquilibriumAdhesionAdsorbateMechanismMeasurementsSilaneSpeciesChemistrySolidResearchWaterRepulsiveTemperatureCurvesPhysical
Molecules12
  • Finally, surfaces functionalised with supramolecular structures were used to enhance the adsorption of guest molecules from solution. (edu.au)
  • This interaction resulted in the adsorption of up to 10,000 guest molecules per 1 host molecule, instead of the expected 1:1 ratio. (edu.au)
  • The adsorption geometry of single molecules with intramolecular resolution were measured. (aps.org)
  • Adsorption is the adhesion [1] of atoms , ions or molecules from a gas, liquid or dissolved solid to a surface . (wikipedia.org)
  • Brunauer, Emmett and Teller's model of multilayer adsorption is a random distribution of molecules on the material surface. (wikipedia.org)
  • Adsorption (not to be confused with absorption) is the accumulation of atoms or molecules on the surface of an adsorbent solid, such as zeolite. (positivehealth.com)
  • The protonated part of hydroxyl and carboxyl group of CLPP combine with negative part of Congo red dye for adsorption of dye molecules. (iwaponline.com)
  • Adsorption kinetics of nanometer scale molecules, such as proteins at interfaces, is usually determined through measurements of surface coverage. (nist.gov)
  • In physisorption absorbed molecules are held by the weaker van der Waals' forces. (silver-colloids.com)
  • Adsorption isotherms measured using small molecules such as argon, nitrogen or carbon dioxide, are usually exploited to determine the pore size distributions of the porous materials. (cecam.org)
  • On the bare Al surface, chloride ions may inhibit the re-passivation through competitive adsorption with oxygen molecules, as suggested by density of state calculations. (kth.se)
  • Quantitation of adsorbed lipids by LC-MS along with the structural assessments of phospholipid binding by atomic force microscopy and molecular modeling indicated that the phospholipids (approximately 108 molecules per SWCNT) formed an uninterrupted "coating" whereby the hydrophobic alkyl chains of the phospholipids were adsorbed onto the SWCNT with the polar head groups pointed away from the SWCNT into the aqueous phase. (cdc.gov)
Isotherms5
  • T c {\displaystyle T_{c}} +10 Isotherms in the first region will show the feature of subcritical adsorption. (wikipedia.org)
  • Isotherms in the third region will show the feature of supercritical adsorption. (wikipedia.org)
  • The transition will take a continuous way if the isotherms in both sides of the critical temperature belong to the same type, such as adsorption on microporous activated carbon. (wikipedia.org)
  • However, discontinuous transition could be observed on isotherms in the second region if there is a transformation of isotherm types, such as adsorption on mesoporous silica gel. (wikipedia.org)
  • 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. (wikipedia.org)
Desorption5
  • [4] The term sorption encompasses both adsorption and absorption, and desorption is the reverse of sorption. (wikipedia.org)
  • The observed adsorption and desorption rates are compared to theoretical predictions based on the measured interaction potential and near wall particle diffusivity. (nist.gov)
  • Control valves allow to switch the gas flow, so each of the adsorbers alternates between adsorption and desorption modes. (dieselnet.com)
  • In all these applications knowing the structure of the carbon, both in the pristine state and under operation, usually involving adsorption/desorption of species, is key to understanding and predicting the performance of the process. (cecam.org)
  • The accurate characterisation of microporous carbons and their evolution upon adsorption/desorption presents a number of challenges associated with the disordered nature of these materials and the multiphysics, and often multi-scale, character of the processes at play. (cecam.org)
Surfaces11
  • In this Thesis, liquid spreading and adsorption onto surfaces were studied as a function of surface properties, such as chemical composition, roughness and functionality. (edu.au)
  • Poly(4-vinylpyridene) (P4VP) surfaces with wrinkled nano and micro-topography were developed to trap a water layer within the surface texture by capillary forces. (edu.au)
  • The influence of adsorbed layers on the interactions between silica surfaces was also investigated using the bimorph surface force apparatus. (diva-portal.org)
  • For the highly charged polyelectrolyte used, a change from a very strong attraction (involving a jump of the surfaces out of contact) to a very long-range elastic attractive force was observed on adding nanoparticles. (diva-portal.org)
  • The long-range elastic force indicates that polymer chains and nanoparticles form a transient network in the gap between the surfaces. (diva-portal.org)
  • Hydrophobic interactions can cause biomolecules to aggregate, and also play a major role in biomolecular adsorption from water onto hydrophobic surfaces [ 11 , 12 ]. (omicsonline.org)
  • Among biomolecules , protein adsorption to surfaces poses a unique challenge, apparent through the plethora of attention in the literature [ 13 - 18 ]. (omicsonline.org)
  • Experimental and theoretical study of forces between surfaces and colloidal particles. (edu.au)
  • Gradient mapping, a variant of force mapping, was also implemented on the three surfaces and resulted in a new technique for visualizing adsorbed surfactant in situ. (monash.edu)
  • 1 ] By way of example, Polanyi published two essays dealing with chemistry and drawing from his own researches in x-ray crystallography, solid-state science, and adsorption of gases on surfaces. (hyle.org)
  • One focus was the adsorption of gases on solid surfaces, which was the subject of his Ph.D. thesis. (hyle.org)
Upon adsorption1
  • Moreover, both DFT and scanning Kelvin probe force microscopy show evidence of electrochemical nobility inversion of Mg2Si versus Al upon adsorption of pure water ad-layers. (kth.se)
Competitive adsorption1
  • Specifically, the effects of shale organic type and maturity, temperature, pressure, and moisture content on pure CH 4 and the competitive adsorption performance of a CO 2 /CH 4 mixture were investigated. (mdpi.com)
Electrostatic5
  • The force profiles were similar to those measured with negatively charged PEG conjugates of 1,2-distearoyl-sn-glycero-3-phosphatidyl ethanolamine (DSPE), except that they lacked the longer ranged electrostatic repulsion observed with the charged compound. (illinois.edu)
  • The lack of electrostatic forces reduced the adsorption of positively charged proteins and enhanced the adsorption of negatively charged ones. (illinois.edu)
  • Under these conditions, electrostatic repulsion forces prevent proteins from adsorbing to the wall. (omicsonline.org)
  • Using functionalized tips, the atomic resolution of a single organic molecule can be achieved by atomic force microscopy (AFM) operating in the regime of short-ranged repulsive Pauli forces while the van-der-Waals and electrostatic interactions only add a diffuse attractive background. (aps.org)
  • The colloid-interface interaction potential is tuned using a combination of depletion, electrostatic, and gravitational forces. (nist.gov)
Surfactant2
  • These results are, to our knowledge, the first time force mapping has been used to spatially track patches of adsorbed surfactant. (monash.edu)
  • Taken together, this is the first demonstration of the in vivo adsorption of the surfactant lipids and proteins on SWCNTs in a physiologically relevant animal model. (cdc.gov)
Behavior1
  • The adsorption behavior and the mechanism of a CO 2 /CH 4 mixture in shale organic matter play significant roles to predict the carbon dioxide sequestration with enhanced gas recovery (CS-EGR) in shale reservoirs. (mdpi.com)
Langmuir4
  • Volumetric method was used in the early days of adsorption studies by Langmuir, Dubinin and others. (wikipedia.org)
  • Irving Langmuir was the first to derive a scientifically based adsorption isotherm in 1918. (wikipedia.org)
  • He assumed the operation of van der Waals-like forces within the framework of classical thermodynamics, but suffered criticism in the early 1920s for not using the new theory of the electron valence bond (and what came to be called chemisorption ) as was done by Irving Langmuir. (hyle.org)
  • Ion Adsorption and Lamellar-Lamellar Transitions in Charged Bilayer Systems , J. Forsman, Langmuir 22 , 2975 (2006). (lu.se)
Adsorbent6
  • It basically comprises a gas expansion process from a storage vessel (reference cell) to an adsorption chamber including adsorbent (adsorption cell) through a controlling valve C, as schematically shown in Figure 1. (wikipedia.org)
  • A dry and degassed adsorbent sample of known weight was enclosed in the adsorption cell. (wikipedia.org)
  • The disadvantage of volumetric measurements is the considerable amount of adsorbent sample needed to overcome adsorption effects on the walls of the vessels. (wikipedia.org)
  • The paper presents an original study on adsorption and aggregation phenomena in a mixed system consisting of a macromolecular compound, heavy metal ions and an innovative adsorbent. (mdpi.com)
  • [3] While adsorption does often precede absorption, which involves the transfer of the absorbate into the volume of the absorbent material, alternatively, adsorption is distinctly a surface phenomenon, wherein the adsorbate does not penetrate through the material surface and into the bulk of the adsorbent. (wikipedia.org)
  • Citrus limetta peel powder is cheap, effective and potential adsorbent for Congo red adsorption from wastewater. (iwaponline.com)
Isotherm2
Atomic5
  • The protein-monolayer surface interaction was determined based on atomic force microscopy (AFM). (elsevierpure.com)
  • The lateral adsorption position was determined with atomic resolution, adsorption height differences, and tilts of the molecular plane with very high precision. (aps.org)
  • Atomic force microscopes, radiation scattering methods. (ausnano.net)
  • Force curves collected using an atomic force microscope (AFM) in the presence of adsorbed surfactants are often used to draw conclusions about adsorbed film packing, rigidity, and thickness. (monash.edu)
  • Using a new mode of atomic force microscopy called AM-FM mode, we estimated the radial modulus of PrP fibrils at ∼0.6 GPa, consistent with the axial moduli derived by using an ensemble method. (pdf-archive.com)
Polyelectrolyte1
  • For the low charged polyelectrolyte used in the study, the force turned repulsive on addition of nanoparticles. (diva-portal.org)
Dispersion forces1
  • In 1930, in collaboration with Fritz London, Polanyi offered a new and generalized explanation for adsorption forces (as dispersion forces) using the new quantum mechanics. (hyle.org)
Absorption1
  • The concentrations of various chemical are estimated with the help of absorption and adsorption of the air pump by personal sampler and high volume air samples. (who.int)
Simulation3
  • Considerable progress has been made in both adsorption measurement techniques and molecular simulation of adsorption on computers, rendering new insights into the nature of supercritical adsorption. (wikipedia.org)
  • Mueller, Sydney, "Molecular Simulation of the Adsorption of Carbon Dioxide in ZIF-93 using the Universal Force Field" (2023). (ewu.edu)
  • Once suitable atomistic models have been generated, additional challenges come with the simulation of adsorption processes. (cecam.org)
Particles4
  • 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. (wikipedia.org)
  • Individual atoms in close proximity to other like atoms will be pulled together by van der Waals' force and form particles. (silver-colloids.com)
  • At the level of individual atoms there is no counter force to prevent the formation of particles. (silver-colloids.com)
  • Findings: According to our Zeta potential measurements, the particles indeed carry a weak negative charge, presumably due to ion specific adsorption. (lu.se)
Protein3
  • The force measurements were complemented by surface plasmon resonance studies of protein adsorption onto these layers. (illinois.edu)
  • The absence of charge also allowed us to determine how membrane charge and the polymer grafting density independently affect protein adsorption on the coated membranes. (illinois.edu)
  • A straightforward way to control protein surface adsorption is to use buffers at pH extremes, to either operate above the isoelectric point of proteins, or suppress ionization of silanol groups at the channel walls [ 10 , 21 ]. (omicsonline.org)
Carbons3
  • Adsorption is present in many natural, physical, biological and chemical systems and is widely used in industrial applications such as heterogeneous catalysts , [8] [9] 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 . (wikipedia.org)
  • Common ways to characterise porous carbons include gas adsorption and X-ray diffraction. (cecam.org)
  • Advances in interaction potentials [17], including machine learning based force fields [18], are crucial in making a range of atomistic structures available, corresponding to carbons synthesised using various conditions, and opening new avenues of research. (cecam.org)
Simulations3
  • In the present work, the adsorption performance and the mechanism of a CO 2 /CH 4 binary mixture in realistic shale kerogen were explored by employing grand canonical Monte Carlo (GCMC) and molecular dynamics (MD) simulations. (mdpi.com)
  • By applying a novel molecular modeling approach based on a combination of quantum mechanical density functional theory and classical grand canonical Monte Carlo simulations, we are able to achieve excellent predictions of olefin adsorption, in much better agreement with experiment than traditional, mostly empirical, molecular models. (ua.pt)
  • A simplistic particle-particle potential of mean force is adopted for the simulations, but we also invoke a more elaborate theoretical model, to demonstrate that similar interactions can be obtained when the grafted chains are treated explicitly. (lu.se)
Experimental1
  • In this paper, we present results of a combined experimental and theoretical study on adsorption of propane, propylene, ethane, and ethylene in CuBTC, a MOF with open metal sites. (ua.pt)
Oxygen2
  • In the case of oxygen generation a zeolite-based sieve forces preferential adsorption for nitrogen. (wikipedia.org)
  • The rich oxygen dopants and van der walls heterojunction between O-CB and ZnIn2S4 promoted charge transfer, oxygen adsorption and reduction for peroxide generation. (bvsalud.org)
Transitions1
  • We study simultaneous adsorption and force induced melting transitions and explore different phases of DNA. (lu.se)
Molecular1
Polymers1
  • Theories for simple polymers describe the forces between end-grafted polymer chains on neutral bilayers. (illinois.edu)
Young's1
  • Capillary forces between rigid spheres and elastic supports: the role of Young's modulus and equilibrium vapor adsorption. (mpg.de)
Equilibrium4
  • For the subcritical region, the highest equilibrium pressure of adsorption is the saturation pressure P s {\displaystyle P_{s}} of adsorbate. (wikipedia.org)
  • It is a dataset of specified adsorption equilibrium. (wikipedia.org)
  • Such equilibrium data are required for optimal design of process relying on adsorption and are considered fundamental information for theoretical studies. (wikipedia.org)
  • Finally, we review recent work on a new non-equilibrium adsorption phenomenon for which we have coined the term mechanisorption. (nature.com)
Adhesion1
  • The actuation force applied on the droplets at the tip of the wedge overcomes the adhesion forces due to the friction forces and contact-line pinning. (edu.au)
Adsorbate1
  • Adsorbate in the adsorbed phase is largely in liquid state, based on which different adsorption and thermodynamic theories as well as their applications were developed. (wikipedia.org)
Mechanism1
  • This fundamental law determines the different adsorption mechanism for the subcritical and supercritical regions. (wikipedia.org)
Measurements1
  • The measurements were performed with the surface force apparatus. (illinois.edu)
Silane1
  • In this work, we collected force curves from tetradecyltrimethylammonium bromide films adsorbed on highly oriented pyrolytic graphite (HOPG), silica, and silica that had been hydrophobized by functionalization with dichlorodimethyl silane. (monash.edu)
Species2
  • 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). (wikipedia.org)
  • [5] [6] The nature of the adsorption can affect the structure of the adsorbed species. (wikipedia.org)
Chemistry2
  • The University of Antwerp, represented by the Laboratory of Adsorption and Catalysis within the Department of Chemistry, is one of the founding members. (uantwerpen.be)
  • The CO2PERATE project (2.6 million euro) is funded by the Agentschap Innoveren en Ondernemen (VLAIO), and supported by Catalisti, the spearhead cluster for chemistry and plastics. (uantwerpen.be)
Solid2
  • adsorption - 1) The formation of a layer of gas, liquid, or solid on the surface of a solid or, less frequently, of a liquid. (silver-colloids.com)
  • Adsorption on a solid from a gaseous phase also occurs. (silver-colloids.com)
Research3
  • During the last 20 years, a growing interest in supercritical adsorption research under the impetus of the quest for clean alternative fuels has been observed. (wikipedia.org)
  • As more research focuses on medical and diagnostic applications involving micro- and nanofluidic devices, the issue of non-specific adsorption of biomolecules at the channel surface is gaining increasing attention [ 5 - 7 ]. (omicsonline.org)
  • I took up my current position as Research Professor at the University of New South Wales, Australian Defence Force Academy, in Canberra, in September 2010. (edu.au)
Water2
  • This unique characteristic distinguishes zeolites enabling an extremely high adsorption capacity for water and other polar components even at very low concentrations. (positivehealth.com)
  • This implies that an originally- 2 -cathodic Mg2Si phase becomes anodic compared to Al upon water adsorption, and is attributed to surface relaxation according to DFT calculations. (kth.se)
Repulsive1
  • The force measured on approach was long-range and quite strongly repulsive. (diva-portal.org)
Temperature4
Curves1
  • The observed difference in the outward force curves may explain why the addition of nanoparticles appears to improve e.g., shear-resistance and re-flocculation characteristics of polymeric flocculants. (diva-portal.org)
Physical1