Last week, I put up a post about good moisturizers for low porosity hair. This time, I want to talk about high porosity hair (you didnt think I would leave this out did you?). If you dont know how to test the difference, read this post. Unlike low porosity hair, high porosity hair absorbs moisture really well. However, it also loses moisture easily. Because the hair cuticles are often open, its hard for high porous hair to retain moisture. High porous hair can be attributed to heat damage, poor hair maintenance, harsh hair dyes or just good ole genes. Its usually thin and can break easily if not properly maintained. High porosity hair needs heavier products and sealants to aid in retaining moisture. Products that contain butters and thicker oils like shea butter, mango butter, babassu oil, olive oil and avocado oil can help to retain moisture high porosity hair. Also, protein-rich products aid in strengthen the hair. Proteins temporarily fill the porous gaps leaving the hair stronger and ...
A catalyst and a method of preparation of said catalyst is described herein. The catalyst includes one or more metals from Columns 6-10 of the Periodic Table and/or one or more compounds of one or more metals from Columns 6-10 of the Periodic Table, a pore size distribution with a median pore diameter ranging from 105 Å to 150 Å, with 60% of the total number of pores in the pore size distribution having a pore diameter within 60 Å of the median pore diameter, with at least 50% of its pore volume in pores having a pore diameter of at most 600 Å, and between 5% and 25% of its pore volume in pores having a pore diameter between 1000 Å and 5000 Å. Methods of producing said catalyst are described herein. Crude products and products made from said crude products are described herein.
Swelling of Cellulosic Porous Materials - Mathematical Description and Verification. Anton Geffert,a,* Ondrej Vacek,b Andrej Jankech,b Jarmila Geffertová,a and Miloslav Milichovský c. The swelling of natural porous materials, including bleached pulp, as represented by mathematical descriptions, is influenced by a variety of different operating factors. The formerly used Generalised Hygroscopicity Model leads to either a disproportion between a model and a limit value of the sorption capacity or to noticeable deviation in the early swelling phase. Alternatively, the so-called Simple Bounded Growth model solely depends on the maximum sorption capacity, ignoring the physical properties that affect the fibre swelling rate. This research shows that the combination of the two models best describes the swelling process of bleached pulp - a rapid swelling phase and a slower swelling phase. The combined model was found to be useful in characterizing the well-known hornification process.. Contact ...
Porous materials have application in adsorption based processes due to their high internal surface area and tailorable pore size. They find uses in fields such as catalysis, separation, biotechnology, and microelectronics. Fluids confined in such materials exhibit interesting behavior in regards to the condensation and evaporation mechanisms. Understanding study the behavior of fluids confined in these porous materials is necessary for the efficient design of these materials. The adsorption/desorption isotherm provides valuable information about the effect of network features like pore connectivity and pore size distribution on fluid behavior during pore condensation and evaporation. Such insight can be useful in the characterization of these porous materials. Three dimensionally ordered mesoporous (3DOm) carbon is a porous material that has recently emerged and is of interest. These porous structures are obtained from templating colloidal crystals formed from lysine-silica nanoparticles. The resulting
The Test: Many, many people on the internet have tried simple tests for porosity. Of all the methods I have seen, I think the following method gives you most accurate results. To determine your hair porosity level using water, spritz a small section of curls with water and watch how your hair reacts - does your hair absorb the water quickly (indicating high porosity) or does it remain on top (indicating a low porosity level).. Normal Porosity: These are the lucky curls. It accepts and retains moisture inside the cuticle. The curls are full of bounce and elasticity and hold styles well. This hair can be dyed easily, and usually requires very little maintenance. Avoid using heat styling tools. When you do use hot tools, use a thermal protectant. Natural or Sulfate-free shampoos and conditioners are good to use. Leave in conditioners can be used to cure fly-aways.. High porosity: I used to have highly porose hair. High porosity hair can be a real pain. Symptoms of high porosity hair could be that ...
In a disposable absorbent garment, an absorbent structure includes liquid absorbing material comprising an upper layer comprising preferably softwood fibers and having a density from about 0.03 to about 0.14 g/cc, a lower layer comprising preferably hardwood fibers, formed substantially separately from and underlying at least a portion of the upper layer, the second layer having top and bottom surfaces, a density from about 0.14 to about 0.3 g/cc, a total void volume greater than about 80%, an average pore size distribution generally less than the average pore size distribution of the upper layer. There is an overlap in the pore size distributions of the upper and lower layers such that the smallest pores in the upper layer are smaller than the largest pores in the lower layer and front and rear fluid storage pouches, preferably spaced from one another at the front one-third and rear one-third of the absorbent structure, respectively, each pouch comprise superabsorbent material disposed in a hydrophilic
In this communication, we present a novel approach for control of drug release from porous materials. The method is based on deposition of a plasma polymer layer with controlled thickness which reduces a pore diameter and, hence, defines the rate of drug release.
Porous Materials Incorporated has six product lines and manufactures over thirty different instruments. In addition, we hold several US and International patents on novel technology for characterization of pore structure. ...
Summary: The aim of this paper was to investigate and analyze microwave and convection drying kinetics of porous materials on laboratory scale. A wet clay plate was chosen as a representative of porous materials. General statements as regards a drying process, whether on a theoretical or analytical level, phenomenological or empirical, still presents on open issue. This is specially true for microwave drying. Modelling was based on elementary layer theory adapted to practical cases of wet plates drying of porous materials both in a laboratory convection dryer and laboratory test apparatus for microvave drying. During the drying process of shaped porous materials, it is inevitable to have knowledge of maximum allowed drying rate curve which can be only obtained by experimentation. Taking this into account special attention was payed to finding out the maximum allowed drying rate curve both for convection and microwave drying. It is, thereby, necessary to have a model that can sufficiently ...
This innovative reference collects state-of-the-art procedures for the construction and design of nanoparticles and porous material while suggesting appropriate
Mercury intrusion porosimetry is a valuable method for characterizing relative pore space dimensions. This dynamic technique is based on the intrusion of mercury into a porous structure under stringently controlled pressures. Mercury intrusion porosimetry permits the calculation of numerous sample properties such as pore size distributions, total pore volume, total pore surface area, median pore throat diameter, and sample densities (bulk and skeletal).. Capillary behavior and permeability are critical to reservoir behavior. Porosimetry is among the few techniques capable of probing the fine connected pore space of shales. This method is particularly useful in evaluation reservoir quality variations within a shale play and in petrotyping shale (Kale et al., 2010, Society of Petroleum Engineer).Various empirical transforms can be applied to estimate permeability from mercury intrusion data. While not quantitative, these estimates can provide a relative assessment of the variation in permeability. ...
Finden Sie alle Bücher von Fleys Matthieu - Water Behavior in Hydrophobic Porous Materials. Bei der Büchersuchmaschine eurobuch.de können Sie antiquarische und Neubücher VERGLEICHEN UND SOFORT zum Bestpreis bestellen. 9783639091427
Disclosed herein are textured nonwoven wiper materials. The textured nonwoven wiper material includes a meltblown nonwoven web material that has a first exterior surface and a second exterior surface, and at least the first exterior surface of the meltblown nonwoven web is a three-dimensional textured surface. The textured meltblown nonwoven web has a multi-modal pore size distribution that includes at least two major pore size peaks.
Shape-Anchored Porous Polymer Monoliths for Integrated Online Solid-Phase Extraction-Microchip Electrophoresis-Electrospray Ionization Mass Spectrometry ...
S. Inagaki, Y. Fukushima, Hikaru Doi, O. Kamigaito; Pore size distribution and adsorption selectivity of sepiolite. Clay Minerals ; 25 (1): 99-105. doi: https://doi.org/. Download citation file:. ...
The present invention provides a porous thermal regenerator apparatus and method of making a porous thermal regenerator comprised of metallic or intermetallic particles that are held together in a porous three dimensional network by a binding agent (such as epoxy). One aspect of the apparatus is that the porosity of the porous thermal regenerator is greater than the tapped porosity of the particles comprising the porous thermal regenerator; moreover, the high-porosity apparatus is durable, that is, it remains intact when exposed to strong time-varying magnetic forces while immersed in aqueous fluid. This high porosity, when combined with high strength and aqueous heat transfer fluid stability, leads to improved porous thermal regenerators and concomitantly to magnetic refrigerators with improved performance.
... , is the process of filling a porous substrate to make it airtight . Porosity is sealed through the process of vacuum impregnation . Vacuum impregnation is the preferred method for sealing parts to prevent fluids or gases from leaking under pressure. Vacuum impregnation seals porosity and leak paths that form during the casting or molding process. It does so without changing the castings' dimensional or functional characteristics and allows manufacturers to use parts that would otherwise be scrapped. There are three types of porosity; Flow Porosity, Gas Porosity and Shrink Porosity. Porosity is found in many cast metal components, but it commonly found in aluminium and magnesium die castings. Process Porosity sealing is a four-step process: In the impregnation chamber (also known as an autoclave, pressure vessel or vacuum vessel) air is evacuated from the leak path in the part by using a deep vacuum. The evacuated leak path is filled with sealant by covering the part with the
The influence of porosity on the superconducting properties have been investigated on YBa/sub 2/Cu/sub 3/O/sub 7/ thin films deposited on LaAlO/sub 3/ [100] substrates by the so-called Trifluoroacetate (TFA) route. Micro-Raman spectroscopy have been used to determine the concentration of c-axis grains /spl delta/ in different samples and their influence on the final film porosity as observed from SEM imaging. This has been compared with measurements of resistivity and critical currents in the same samples. We prove that this /spl delta/ fraction is the main parameter controlling the porosity and hence the normal-state resistivity of the thin films. The optimization of the microstructure of these YBa/sub 2/Cu/sub 3/O/sub 7/ TFA films allow to have high critical currents : J/sub c/ = 3 /spl times/ 10/sup 6/ A/cm/sup 2/ at 77 K ...
American Society for Testing and Materials (1999) Standard Test Method for Determination of Pore Volume and Pore Volume Distribution of Soil and Rock by Mercury Intrusion Porosimetry, Designation D 4404-84 (Reapproved 1992). Annual Book of ASTM Standards, 04.08, 588-592.
A porous object includes a porous material having internal pore surfaces and external pore surfaces. Releasing material encapsulated biomolecules are immobilized on at least one of the internal pore surfaces, at least one of the external pore surfaces, or combinations thereof.
The present invention provides biosensor test devices for measuring the presence or amount of an analyte in a biological fluid. The devices have a base plate that has an electrode system embedded therein, and a hydrophilic porous material situated on the base plate. A hydrophobic protective layer is situated on the hydrophilic porous material, and a cover is placed on the hydrophobic protective layer to complete the device. Some embodiments also use an insulating layer, which can be situated between the base layer and the hydrophilic porous material. The cover of the device has an opening present therein, situated over the electrodes, so that the electrodes communicate with the exterior of the device through the groove. The insulating layer can also have a groove situated therein, which in one embodiment is placed to align with the groove in the cover. The invention also provides methods of manufacturing the devices, and methods of using them.
Summary: The development of new porous materials is critical to improving important gas storage and separations applications, and will have a positive impact on reducing greenhouse gases. This includes the deployment of methane and/or hydrogen gases as alternative fuels, development of new filters for removing trace gaseous contaminants from air, and separation of carbon dioxide from flue gas to mitigate greenhouse emissions from the burning of fossil fuels. Dr. Wilmers grant will enable his lab to utilize computational methods to probe the limits of material performance for physical adsorption to porous materials. Although past computational screening has suggested physical limits of adsorption capacity for metal-organic frameworks (MOFs), this project will explore the novel use of so-called "pseudomaterials," which represent all potential atomistic arrangements of matter in a porous material ...
The consolidation and permeability characteristics of high porosity surficial sediments from the Coastal Benthic Boundary Layer (Naval Research Laboratory) Special Research Program test site in the EckemfOrde Bay Baltic Sea were studied using a backpressured, constant rate of deformation (CRD) consolidation and permeability testing system driven by flow pumps The silty clay sediments from the Baltic test site are characterized by high void ratios (above 6), large organic content and dissolved or free methane gas bubbles. The high organic content (up to 17%) influences several of the unique features of these sediments including high water contents (up to 500%; porosities up to 93%), high consistency limits and high compressibility. The sediments are dominated by clay and silt size fractions (42% and 55% respectively) with a small percentage (3%) of sands. Organic content determinations performed on selected samples indicated a variation from 9% to 17% in the organic fraction (dry weight basis). Atterberg
A matrix including: a) a polymeric base matrix including macropores (pore system 1) and b) an interior material, possibly porous (pore system 2), retained within the macropores. The matrix is characterized in that there is a continuous free volume between the interior material and the pore walls of the macropores. A method for manufacturing a matrix including a base matrix having macropores in which an interior material is located. The method is characterized in including the steps: (I) providing a base matrix having macropores; (ii) filling the macropores with a soluble form of the interior material; (iii) transforming the insoluble from to an insoluble form; (iv) shrinking the insoluble form; and (v) irreversibly stabilizing the material in its shrunken form. The matrix can be used in separation methods, cell culturing, solid phase synthesis of organic molecules, and in catalytic reactions (such as enzyme reactions) and other uses in which porous support matrices are used.
where np and ns refer to the refractive index of the porous material and solid material, respectively, and p is the porosity of a porous material. However, it is difficult to measure the pore size, grain size, and porosity of the film as the thickness is only tens to a hundred of nanometers. Most of the reported porosity measurement methods are calculated or analogical. For example, Orignac et al. [22] reported the porosity volume fraction Vp is estimated as the ratio between the sum of the areas of the pores measured in the SEM image and the total imaging area of the sample. Xiao et al. [23] measured the reflective index based on the relationship between the reflective index and acid- or base-catalyzed sol ratio. They found the refractive index of the mixed AR films is proportional to the acid- to base-catalyzed sol ratio. With an acidic catalyst, the growth of silica sol tends to form linear chains, giving the acid-catalyzed AR film a refractive index of 1.44. By mixing the base-catalyzed and ...
All about Effect of shrinkage porosity on mechanical properties of steel casting sections by G. K. Turnbull. LibraryThing is a cataloging and social networking site for booklovers
Current understanding of porosity preservation in deeply buried sandstone reservoirs tends to be focused on how diagenetic grain coatings of clay minerals and microquartz can inhibit macroquartz cementation. However, the importance of overpressure developed during initial (shallow) burial in maintaining high primary porosity during subsequent burial has generally not been appreciated. Where pore fluid pressures are high, and the vertical effective stress is low, the shallow arrest of compaction can allow preservation of high porosity and permeability at depths normally considered uneconomic. The deeply buried fluvial sandstone reservoirs of the Triassic Skagerrak Formation in the Central Graben, North Sea, show anomalously high porosities at depths greater than 3500 metres below sea floor (mbsf). Pore pressures can exceed 80 MPa in the upper part of the Skagerrak Formation at depths of 4000-5000 mbsf, where temperatures are above 140°C. The Skagerrak reservoirs commonly have high primary ...
The presented report focuses on an in-depth detailed characterization of immobilized methyltrioxorhenium (MTO), giving catalysts with a wide spectra of utilization. The range of mesoporous materials with different SiO2/Al2O3 ratios, namely mesoporous alumina (MA), aluminosilicates type Siral (with Al content 60%-90%) and MCM-41, were used as supports for immobilization of MTO. The tested support materials (aluminous/siliceous) exhibited high surface area, well-defined regular structure and narrow pore size distribution of mesopores, and therefore represent excellent supports for the active components. Some of the supports were modified by zinc chloride in order to obtain catalysts with higher activities for instance in metathesis reactions. The immobilization of MTO was optimized using these supports and it was successful using all supports. The success of the immobilization of MTO and the properties of the prepared heterogeneous catalysts were characterized using X-ray Fluorescence (XRF), atomic
A ceramic honeycomb substrate for use in an automotive catalytic converter system which exhibits improved light-off performance by virtue of a high porosity of 45 to 75% while still maintaining a wall thickness of greater than 2.0 mil (0.0020 inch, 0.0508 mm), preferably 2.5 mil (0.0025 in., 0.0635 mm) to 7 mil (0.0070 in., 0.1778 mm), and more preferably 2.5 mil (0.0025 in., 0.0635 mm) to 3 mil (0.0030 in., 0.0762 mm). The median pore size is in the range of 2-10 micrometers, and a coefficient of thermal expansion (CTE) (25-800 C.) of less than 15 10−7/ C.
Diesel engines are more fuel efficient due to their high thermal efficiency, compared to gasoline engines and therefore, have a higher potential to reduce CO2 emissions. Since diesel engines emit higher amounts of Particulate Matter (PM), DPF systems have been introduced. Today, DPF systems have become a standard technology. Nevertheless, with more stringent NOx emission limits and CO2 targets, additional NOx emission control is needed. For high NOx conversion efficiency, SCR catalysts technology shows high potential. Due to higher temperature at the close coupled position and space restrictions, an integrated SCR concept on the DPFs is preferred. A high SCR catalyst loading will be required to have high conversion efficiency over a wide range of engine operations which causes high pressure for conventional DPF materials. Therefore, a high porosity DPF design has been developed to overcome the trade off between high pressure drop, high wash coat loadings, and sufficient filtration efficiency. ...
Lambert LM-6 Organic Professional High Porosity Mix is a combination of premium long-fibered Canadian sphagnum peat moss, chunks and coarse perlite with an organic wetting agent and an extended-release organic fertilizer. Ideal for plants that require higher aeration and drainage.. ...
Microporous and mesoporous materials have been extensively used in heterogeneous catalysis and adsorbent materials. The session provides expert perspectives and covers new developments in the synthesis of zeolite catalysts, mesoporous metal and metal oxide catalysts with tuned porous structures, active sites and morphologies.. ...
A dual porosity PTFE tube including an inner surface of expanded PTFE material having a first porosity and an outer surface of expanded PTFE material having a porosity different from that of the inner surface. The preferred method includes the step of forming inner and outer preformed tubular billets of PTFE resin particles mixed with a lubricant; the outer billet is adapted to closely fit around and concentric to the inner billet. Porosity of the inner and outer surfaces is varied by changing, in the respective billets, the lubrication level and/or the PTFE resin characteristic average particle size. The inner billet is placed inside the outer billet, and the two are extruded together, thereby melding the two billets. The extrudate is then longitudinally expanded and sintered. The inner surface of the resulting PTFE tube exhibits a different porosity than the outer surface of the tube; the porosities of the inner and outer surfaces are both within a range of about 0.10-200 μ.
Porous Materials, Inc. is the leading designer and manufacturer of custom scientific instruments for characterization of porosity, pore diameter, pore volume, pore surface area, liquid permeability, gas permeability, density, and integrity testing. For water filtration field (MF, UF and NF), Li-ion battery and fuel cell efficiency, pore property of separator is one of key issue. PMI offer various instruments for characterizing pore property, such as Capillary Flow Porometry, Bubble Point Tester, Liquid-Liquid Porometer, Li-ion separator porometry, Fuel Cell Porometry, Gas Diffusion Layer Porometry, BET Sorptometer (high pressure, physisorption, chemisorbtion), Nano-porometry(0.5nm), Mercury Intrusion Porosimetry, Non-mercury Intrusion Porosimetry, Hydrophobic/hydrophilic porosimetry. In addition, we offer Gas permeametry, Liquid permeametry and Gas/Vaper Diffusion Analyzer for testing fluid transmission efficiency.. Production equipment such as Hollow Fiber Fabrication Apparatus and Flat-Sheet ...
Porous Materials, Inc. is the leading designer and manufacturer of custom scientific instruments for characterization of porosity, pore diameter, pore volume, pore surface area, liquid permeability, gas permeability, density, and integrity testing. For water filtration field (MF, UF and NF), Li-ion battery and fuel cell efficiency, pore property of separator is one of key issue. PMI offer various instruments for characterizing pore property, such as Capillary Flow Porometry, Bubble Point Tester, Liquid-Liquid Porometer, Li-ion separator porometry, Fuel Cell Porometry, Gas Diffusion Layer Porometry, BET Sorptometer (high pressure, physisorption, chemisorbtion), Nano-porometry(0.5nm), Mercury Intrusion Porosimetry, Non-mercury Intrusion Porosimetry, Hydrophobic/hydrophilic porosimetry. In addition, we offer Gas permeametry, Liquid permeametry and Gas/Vaper Diffusion Analyzer for testing fluid transmission efficiency.. Production equipment such as Hollow Fiber Fabrication Apparatus and Flat-Sheet ...
TY - JOUR. T1 - Mechanism of carbon dioxide adsorption in a highly selective coordination network supported by direct structural evidence. AU - Plonka, Anna M.. AU - Banerjee, Debasis. AU - Woerner, William R.. AU - Zhang, Zhijuan. AU - Nijem, Nour. AU - Chabal, Yves J.. AU - Li, Jing. AU - Parise, John B.. PY - 2013/2/4. Y1 - 2013/2/4. N2 - Trapped in a porous material: The position of adsorbed CO2 in a nanoporous coordination framework was determined using a combination of techniques including single-crystal X-ray diffraction, in situ X-ray powder diffraction coupled with differential scanning calorimetry, and theoretical calculations. The study reveals that the adsorbed CO2 stays in a "pocket" between two phenyl rings, interacting with the aromatic electron density (see picture).. AB - Trapped in a porous material: The position of adsorbed CO2 in a nanoporous coordination framework was determined using a combination of techniques including single-crystal X-ray diffraction, in situ X-ray ...
Today Im discussing the best method for moisturizing low porosity hair. What is Low Porosity Hair? All hair is porous but porosity level is impacted by the amount of damage done to the cuticle layer. High porosity generally has more damage to the cuticles, thus it absorbs water quicker but also loses it equally as fast, making it hard to keep…. Read More ». ...
Water is one of the most important components for our life. Preservation of fresh water is one of the most important issues in sustainable development, which is called water treatment. In water treatment there are two main separated steps, separation and degradation. Many kinds of porous materials including zeolites and porous carbons were used for pollutant separation by adsorption. TiO2 was widely used for photocatalytic degradation of pollutant. Here we report new type of inorganic-organic hybrid porous material, metal-organic framework (MOF), which can adsorb pollutant from water followed by degradation of the pollutant by light irradiation. The MOF comprising porphyrin based ligand has good stability in water unlike most of MOFs. The MOF selectively adsorb a pollutant having smaller size than its pore size, which demonstrates size selective pollutant adsorption property of the MOF. In addition, porphyrin ligands decompose the adsorbed pollutant by visible light irradiation. Therefore, the ...
Filters whose porosity decreases with depth are often more efficient at removing solute from a fluid than filters with a uniform porosity. We investigate this phenomenon via an extension of homogenization theory that accounts for a macroscale variation in microstructure. In the first stage of the paper, we homogenize the problems of flow through a filter with a near-periodic microstructure and of solute transport owing to advection, diffusion and filter adsorption. In the second stage, we use the computationally efficient homogenized equations to investigate and quantify why porosity gradients can improve filter efficiency. We find that a porosity gradient has a much larger effect on the uniformity of adsorption than it does on the total adsorption. This allows us to understand how a decreasing porosity can lead to a greater filter efficiency, by lowering the risk of localized blocking while maintaining the rate of total contaminant removal.. ...
die casting porosity & die casting porosity online Wholesalers - choose die casting porosity from 592 list of China die casting porosity Manufacturers.
TY - JOUR. T1 - Direct synthesis of methanol by partial oxidation of methane with oxygen over cobalt modified mesoporous H-ZSM-5 catalyst. AU - Krisnandi, Yuni Krisyuningsih. AU - Samodro, Bayu Adi. AU - Sihombing, Riwandi. AU - Howe, Russell Francis. N1 - This work was funded by International Collaboration Research Grant UI No.1832/H2.R12/HKP.05.00 Perjanjian/2014.. PY - 2015/11. Y1 - 2015/11. N2 - Partial oxidation of methane over mesoporous catalyst cobalt modified H-ZSM-5 has been carried out. Mesoporous Na-ZSM-5 (Si/Al = 35.4) was successfully synthesized using double template method which has high surface area (450 m2/g) and average pore diameter distribution of 1.9 nm. The as-synthesized Na-ZSM-5 was converted to H-ZSM-5 through multi-exchange treatment with ammonium ion solution, causing decreased crystallinity and surface area, but increased porous diameter, due to dealumination during treatment process. Moreover, H-ZSM-5 was loaded with cobalt (Co = 2.5% w) by the incipient ...
Surface area and porosity are two important physical properties that determine the quality and utility of many materials. Differences in the surface area and porosity of particles within a material can greatly influence its performance characteristics. This instrument enables surface area and pore size analysis.. The Micromeritics ASAP 2020 is used for the determination of surface area and porosity of materials. The instrument utilises gas physisorption to accurately and reliably produce surface area and porosity results. Using a static volumetric technique to adsorb gas onto a sample surface, the instrument is capable of determining surface areas and pore volumes by applying a range of models, such as, B.E.T., Langmuir, t-plot, a-plot, and determine pore size distributions by applying models such as, B.J.H. and DFT models to the sorption isotherms. The instrument is capable to record up to 1000 data points on the sorption isotherm ranging from 10-7 to 0.995 partial pressures.. The instrument ...
Abstract: Theoretical and experimental investigations of water vapor interaction with porous materials are very needful for various fields of science and technology. Not only studies of the interaction of water vapor and porous material as a continuous medium, but also the study of the interaction of water vapor with individual pore is very important in these researches. Mathematical modelling occupies an important place in these investigations. In this work, a study of efficiency of various implementations algorithms for MD simulation of water vapor interaction with individual pore is carried out. A great disadvantage of MD is its requirement of a relatively large computational effort and long time in simulations. These problems can be drastically reduced by parallel calculations. In this work we investigate dependence of time required for simulations on different parameters, like number of particles in the system, shape of pores, and so on. The results of parallel calculations are compared ...
The occurrence of porosity during metal solidification is one of the major issues that impact the quality of castings. Quantitative information on the development of porosity is particularly important for safety critical components, such as automotive chassis parts and airframe primary structures. In this paper, we present two approaches to predict the location and volume fraction of porosity for aluminum alloy A356. In the first approach, the application of Neural Networks to predict porosity is examined. Results are compared with the established criteria functions and reported experimental findings. Neural Networks are shown to predict the occurrence of porosity with higher confidence than the existing thermal parameter based criteria functions. In the second approach, microporosity evolution is modeled mathematically. This model incorporates various solidification phenomena such as dendrite formation and growth, hydrogen evolution at the solid/liquid interface, solidification shrinkage, ...
This thesis describes the production of two types of hierarchical macroporous polymers using the emulsion templating technique. The first are those with a hierarchy of macroporous, defined as the efficient packing of pores with multi-modal pore size distributions. The second are macroporous polymers containing a hierarchical particulate network, defined by an interconnected particle network within the polymer matrix. In the first section of the thesis, macroporous hierarchy was achieved using 3 different methods. In the first method, the properties of surfactant stabilised high internal phase emulsion (HIPE) were optimised by varying selected emulsification parameters such as the surfactant concentration and stirring rate. The Finite Element Method (FEM) was subsequently used to qualitatively compare and validate the effect of pore hierarchy on the Youngs modulus of macroporous polymers. It was believed that the hierarchical arrangement of macropores facilitated the load transfer during ...
Sound propagation in water-saturated granular sediments is known to depend on the sediment porosity, but few data in the literature address both the fre- quency and porosity dependency. To begin to address this deficiency, a flu- idized bed technique was used to control the porosity of an artificial sediment composed of glass spheres of 265 ?m-diameter. Time-of-flight measurements and the Fourier phase technique were utilized to determine the sound speed for frequencies from 300 kHz to 800 kHz, and porosities from 0.37 to 0.43. A Biot-based model qualitatively describes the porosity dependence.. ...
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A high strength porous polymeric material manufactured by a compression process is disclosed. The material results in a network of interconnected collapsed pores, which forces thin overlapping walls and passages to be created. The network provides permeable access for fluid migration throughout the material. The strength and/or permeability are advantageous for medical devices and implants.
A high strength porous polymeric material manufactured by a compression process is disclosed. The material results in a network of interconnected collapsed pores, which forces thin overlapping walls a
Controlled release of bioactive molecules from porous materials regulates cellular functions Living cells are recognized as an ultimate assembly of molecules. As its active matter, a living cell regulates its function by intracellular signalling molecules and communicates to each other by extracellular signalling molecules. We develop porous materials that accommodate important signalling molecules (nitric oxide, carbon…