Abstract
We demonstrate a sandwich-like membrane configuration, termed an electroconvective liquid crystal membrane (ECLCM), in which the electric field induced convection of a liquid crystal layer facilitates the transport of gases through the membrane. The permeation rate of CH 4 and N 2 through a N-(4-methoxybenzylidene)-4-butylaniline (MBBA) liquid crystal membrane was increased by a factor of 7 when an alternating electric field of 100 V/mm was applied to the liquid crystal. The permeability of the liquid crystal layer increased by a factor of 50 under the same conditions. The gas permeation rate increase was limited by the porous electrodes confining the liquid crystal. The CH 4/N 2 selectivity of the membrane, about 3, was determined by the solubility of these gases in the liquid crystal and by the electrode permeability.
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