M. Smaihi et al., ORGANIC-INORGANIC GAS SEPARATION MEMBRANES - PREPARATION AND CHARACTERIZATION, Journal of membrane science, 116(2), 1996, pp. 211-220
Gas separation composite membranes have been prepared using a porous s
ubstrate and a thin organic-inorganic sol-gel layer as a permselective
coating. These permselective layers have been obtained by co-hydrolys
is of an organoalkoxisilane (C6H5)(n)-Si(OCH3)(4-n) [n = 1, 2] and tet
ramethoxysilane Si(OCH3)(4). Various molecular structures are formed d
epending on the functionality of the organoalkoxide and its proportion
in the mixture. These networks have been characterized by solid-state
NMR, small-angle X-ray scattering and differential scanning calorimet
ry. Single gas flux measurements for various gases (CO2, N-2, He) have
been obtained and ideal CO2/N-2, He/N-2 selectivities calculated. Gas
permeation results are discussed in terms of structural characterizat
ion.