The membrane potential across poly(vinyl chloride)/spirobenzopyran (1) membrane changed reversibly by UV and visible light irradiation even when no concentration gradient of electrolyte existed between two external solutions separated by the membrane. The photoresponse of the membrane potential strongly depended on the 1 content of the membranes. The results are explained in terms of formation of asymmetric membrane, namely the opened-1: closed-1 ratios of the two surfaces of the membrane were different from each other under UV light.
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Anzaki et al. (1985) studied this question.
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