Abstract
Dielectric properties of nonionic lamellar liquid crystals with and without electrolytes and pharmaceutical drugs are reported in the frequency range 40 MHz to 2 GHz. In the aqueous C 12EO 3 lamellae sodium chloride and pilocarpine chloride both give rise to a dielectric dispersion. The nonionic chloramphenicol is completely incorporated into the interfacial region or imbedded into the hydrocarbon part of the model membrane, without giving rise to any dispersion. With added ionic surfactants the membrane surface becomes charged and all systems show a dielectric dispersion. Qualitatively, the findings can be explained by means of counterion behavior at the membrane surface (surface diffusion) or freely diffusing counterions in the aqueous layer. When the lamellar liquid crystalline phase is melted the dielectric dispersions vanish.
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