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| - Sorption in Zeolites Modified for Use in Organic−InorganicHybrid Membranes
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| Abstract
| - Adding zeolites to polymer matrixes can provide improved materials for membrane-based separation of gases.To create such materials, the sorption in and diffusion through the zeolites must be relatively unhindered bythe process of modification and bonding to the polymer. An attractive approach to achieve the stabilizationand bonding of the zeolite phase involves silane treatment of external zeolite surfaces prior to dispersion.This study shows that standard treatments to achieve the silylation in an aqueous alcohol mixture with theassistance of ultrasonic energy can cause surprising and undesirable alterations in the sieve properties. Usingzeolite 4A as a model and γ-aminopropyldimethylethoxysilane in both ethanol−water and isopropanol−water mixtures, the extent of sieve sorption property changes during reaction in the presence of ultrasoundexposure is illustrated. Control studies with these alcohol−water systems further identify the impact of thealcohol type on the zeolite. Oxygen sorption kinetics and equilibria are reported for the modified and unmodifiedzeolite after activation and drying under typical conditions used for forming such hybrid materials. It isconcluded that sonication appears to drive both isopropanol and ethanol into the sieves; however, drying at250 °C appears to enable recovering most of the intrinsic sieve sorption and transport properties.
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