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Adsorption; Dielektrika; Membranen; Transporterscheinungen; Zwischenmolekulare Wechselwirkungen
Abstract:
A continuum electrostatic calculation explores dielectric heterogeneity in membranes and its influence on ion sorption. The spherical shell model of Ullman is used. A transition in predicted sorption behaviour occurs as b, the mean ionic radius, becomes comparable with L, the size of dielectric domains. Since the finite size of molecules establishes a lower limit of L ˜ b, it is likely that no membrane is a strictly homogeneous dielectric from the standpoint of ion sorption. The calculation predicts that changing the dielectric domain size between 5 · 10−8 and 20 · 10−8 cm has a drastic effect on ion sorption. Objections which can arise from the very special nature of Ullman's model are discussed.
