Water-adsorption capabilities

The choice of immobilization matrix material must be made carefully because its polarity, or aquaphilicity (water-adsorption capability), and the chemistry of its charged surface groups can affect the observed enantioselectivity and the occurrence of side reactions, particularly hydrolysis and isomerization (e.g., of mono-and diglycerides during lipase-catalyzed synthesis of structured triglycerides). In the situations alluded to above, it may be worthwhile to screen the various immobilization matrices. 

Although the exact proton conduction mechanism on the ionomer-free Pt surface of NSTF remains unclear, it is apparent that the conductivity is strongly dependent on water content [82, 121] It is conceivable that one could achieve higher proton conductivity under a dry operating condition if one improved the water-holding and/ or water-adsorption capabilities at the Pt surface. In one attempt, highly hydrophilic... 

Rennukka and AmiruP reported fabrication of P(3HB-co-4HB)/chitosan blends by adding chitosan powder (5, 10,15 and 20 wt%) to P(3HB-co-4HB) with various 4HB molar fractions (10,18 and 28 mol%). Since P(3HB-co-4HB) copolymer is hydrophobic in nature, it did not show any hydrophilicity regardless of various compositions of 4HB monomer. However, there was a significant improvement of the water adsorption capability when the chitosan content in the blends was increased from 5 to 20 wt%. Water uptake was influenced by the presence of the free hydrophilic groups in the blend films. The presence of chitosan induced the intra or/and inter-molecular network between the components in the blend films. Therefore, the hydrophilicity of the blend films increased. 

Hydrogen gas is slightly soluble in water, alcohol, and ether. Although it is noncorrosive, it can permeate solids better than air. Hydrogen has excellent adsorption capabilities in the way it attaches and holds to the surface of some substances. (Adsorption is not the same as absorption with a b, in which one substance intersperses another.)... 

Zeolite is a crystalline aluminosilicate, chemical constituent of which is Si02, A1203, H20, Na20, K20, CaO. Micro pore which involves crystal water adsorbs various gaseous molecule. Zeolite well adsorbs polar molecule but even if non-polar molecule, it can also performs adsorption capability depending upon shape or size of molecule. 

Zeolite dehydration, its reversibility, water substitution for other molecules, having dimensions not larger than the characteristic pore openings of the material, interactions between host structure and guest molecule, surface properties (acidity and adsorption capability), the occurrence of solid-solid phase transitions, thermal stability, and so on, are all research subjects in which thermal analysis can make an invaluable contribution. Thermal analysis has been used extensively since its appearance to determine some of the peculiar properties of the zeolites, so that several hundred papers on this subject are present in the technical literature. 

Aluminas have been in use for many years as adsorbents. First introduced commercially in 1932 by Alcoa for water adsorption [1], activated aluminas have traditionally been known as desiccants for the chemical process industries. As early as 1901, references can be found for the use of synthetic aluminas in the chromatographic purification of biological compounds [2], In recent years aluminas have found widespread usage in applications as diverse as municipal wastes, polymers, and pharmaceuticals. Novel design of these materials is extending their separations capability into even more nontraditional areas of adsorption technology. 

Base metal adsorption capability of Fe- and Mn-hydroxides is high. Fe- and Mn-hydroxides contain sometimes appreciable amounts of other base metals as solid solution (e.g., Cr in Fe (OHls). Therefore, concentration of base metals in ground water are strongly affected by the presence of Fe- and... 

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