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Showing 1 to 20 of 20 for “"Molecular Sieving"”.
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Development of macroscopic nanoporous graphene membranes for gas separation
… can support sub-nanometer pores that enable molecular sieving while presenting low resistance to permeate flow. The feasibility of gas separation by graphene nanopores has been demonstrated experimentally on micron-scale areas of graphene. However, scaling up to macroscopic sizes presents …
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ΑΠΟΜΟΝΩΣΗ ΚΑΙ ΧΑΡΑΚΤΗΡΙΣΜΟΣ ΤΗΣ ΚΙΝΑΣΗΣ ΚΑΖΕΙΝΗΣ ΙΙ ΑΠΟ ΣΠΛΗΝΑ ΠΑΙΔΙΩΝ ΜΕ ΜΕΣΟΓΕΙΑΚΗ ΑΝΑΙΜΙΑ
… AMMONIUM SULFATE FRACTIONATION AND MOLECULAR SIEVING. THE PURIFIED ENZYME PHOSPHORYLATES IN PREFERENCE ACIDIC PROTEINS, CASEIN, USING ATP AND GTP AS PHOSPHATEDONORS, IN THE PRESENCE OF MGCL2. THE ENZYME IS CAMP AND CGMP INDEPENDENT, HAS A MOLECULAR WEIGHT OF 43.000 AND PI 71. IT IS …
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Nanofluidic devices for rapid analysis of DNA and proteins
… with critical dimensions comparable to the molecular scale open up new possibilities for direct observation, manipulation and analysis of biomolecules (single or ensemble), thus providing a novel basis for ultra-sensitive and high-resolution sensors and medical diagnostic systems. Inspired …
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Adsorption Behavior of Volatile Organic Compounds in Metal -Organic Frameworks
… and chemical properties from the other MOFs. A molecular-sieving effect was observed preventing the adsorption of branched-alkanes, aromatics, and heavily halogenated compounds. Hydrogen-bonding interactions were found to be important for the adsorption of alcohols and amines. However, the …
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Layered graphene nanomaterials for gas separation membrane applications
… In addition, the high selectivity is due to the molecular sieving or diffusion effect resulting from their narrow pore size distribution or their unique surface chemistry. Graphene oxide membranes can be prepared in several forms: as supported, self-standing, and nanocomposite materials. …
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Design of chemistry and morphology of polymer filtration membranes
… without fouling. This membrane can also perform molecular sieving, serve as a chromatography instrument, and isolate a product of a designated size distribution on a nanoscale via its tunability of channel sizes, as demonstrated in the uniform size dispersity of gold nanoparticles. Moreover, gold …
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Modeling real world phenomena using molecular dynamics and continuum simulations
… a bacterial infection by weeks. Secondly, molecular dynamics and ab-initio molecular dynamics simulations have been performed to validate molecular-sieving of organic molecules like cyclohexane and n-hexane through carbon nanotubes. This can potentially lead to a process which can separate …
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Polymer molecular sieve membranes
… design and fabrication of membranes from novel molecularly defined polymers and understanding their physical properties, particularly the transport properties of gas molecules in polymer membranes. First, we demonstrate a simple approach of fabricating novel polymer nanocomposite membranes using …
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Electrokinetic separations involving surfactants and proteins
… cellulose to the buffer to work as a dynamic molecular sieving medium was investigated to improve resolution. Analyte/ capillary surface interactions are a major limitation in CE especially for the analyses of proteins. The use of coated capillaries to eliminate these interactions has been …
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Polymer Aluminophosphate Mixed Matrix Membranes for Gas Separations
… ring openings in the size range of 3-4 Ã . The molecular level dispersion of this material into a polymer matrix is theorized to increase selectivity by molecular sieving. A previous study performed in our laboratory showed an increase in He/CH4 selectivity when this aluminophosphate (8MR-AlPO) …
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Physical and geochemical characterisation of canal sediments in the Black Country, West Midlands.
… due to their attractive properties, such as molecular-sieving, high cation exchange capacities and their affinity for PHEs. The pilot study to investigate the efficiency of the clinoptilolite showed that there was a concentration difference between PHEs adsorbed by the clinoptilolite and the …
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Influence of Ag Nanoparticle Loading on Dye and Salt Removal Efficiency of Graphene Oxide Membranes
… tunable surface chemistry, and exceptional molecular sieving properties. However, despite these advantages, the practical deployment of GO membranes in aqueous environments is hindered by critical limitations, most notably, structural swelling and interlayer expansion due to water …
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Transport of molecules through and on carbon nanostructures
… selectivity, inversely proportional to the molecular weight; selectivity exceeding Knudsen is possible with smaller pores that reach a size commensurate with the size of the molecule, enabling separation by molecular sieving. The second pathway involves adsorption and transport on the …
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Innovative hydrocarbons recovery and utilization technology using reactor-separation membranes for off-gases emission during crude oil shuttle tanker transportation and natural gas processing.
… s-1 m-2 respectively proving that zeolite has molecular sieving mechanism for separation of methane and propane. The silica membrane exhibited higher effectiveness for the separation of CO2 than the other membranes. For methane dry reforming using a supported rhodium membrane, an increase of …
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Modification of Polymer Membranes: A Study of Crosslinking and In-Situ Growth of Palladium-Containing Nanoparticles in Polymer Matrices.
… key to the successful, economical production of molecular hydrogen for the eventual consumer market. Size-sieving glassy polymer membranes can separate H2 on the basis of its small size. Alternatively, reverse-selective rubbery polymers can expedite the passage and, hence, removal of CO2 due to …
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Design and fabrication of asymmetric nanopores using pulsed PECVD
… such as DNA sequencing, ionic transistors, and molecular sieving. Precisely controlling the size, geometry and surface characteristics of the nanopores is important for realizing these applications. In this work, we employ relatively large template structures (~ 100 nm) produced by track-etching …
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Continuous production of two archetypal metal-organic frameworks using conventional and microwave heating
… of the useful properties of zeolites such as molecular sieving, with the potential for tuneable pore sizes allowing a more optimal pore size for the selected application. However, MOFs are rarely produced at a large scale and are yet to become a viable alternative to current technologies. Here …
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Transport and selectivity studies of protons across 2D membranes and molecules through angstrom-sized nanopores
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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Characterisation of waxy gas-condensates by high temperature capillary gas chromatography and oxidative degradation
High molecular weight (HMW) hydrocarbons (defined herein as C35+ compounds) are difficult to characterise by conventional analytical methods. Very few studies have reported precise and reproducible quantification of such compounds in fossil fuels. Nonetheless, such components have important effects …
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Adsorption behavior of volatile organic componds in metal-organic frameworks
… the most widely studied MOFs). A wide range of molecular properties was represented in the studied analytes and standard analytical techniques were employed to extract equilibrium and thermodynamic data. Dispersive surface energies were calculated for the MOF samples and adsorption data was …