The selectivity of
these membranes is slightly higher than that of pristine PEC membranes due to the fine dispersion of SiO2. Moreover, the incorporation of SiO2 also improves the processability and mechanical
properties of PEC. For the pervaporation of ethanol–water mixtures
using organophilic nano-silica filled polydimethylsiloxane (PDMS)
composite membranes, the solubility selectivity and the diffusion
selectivity increased with increasing organophilic nano-silica concentration