Abstract
An electroconvective liquid crystal membrane was previously investigated. The gas permeation rate through a N-(4-methoxybenzylidine)-4-butylaniline (MBBA) membrane was increased by a factor of 7 when an a.c. electric field of 100 volts/mm was applied. Recently, polar solvents such as 2-ethylhexanol (2EH) and diethyl phthalate (DEP) were studied as new electroconvective liquid membrane candidates. They are much cheaper than MBBA, in air chemically more stable, and may be used to replace the liquid crystal. A de-ionization procedure was used to decrease the conductivity of the polar solvents below 10 −10 ohm −1-cm −1 so they would exhibit convectivity.
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