Dynamics of Surface-Differentiated Alkylammonium Ion Vesicles.

摘要

Since their introduction by Kunitake and Fendler, simple, long-chain dialkylammonium ion vesicles have been used as model bilayer membranes. However, little is known about the dynamics of the monomeric surfactant molecules within these bilayers, particularly their trans-membrane diffusion, or 'flip-flop', between endovesicular and exovesicular loci. In this paper, we examine the influence of alkyl chain length on the flip-flop dynamics of p-nitrophenyl benzoate functional surfactants in covesicles with nonfunctional surfactants. Our methodology, relates the molecular structure of the surfactant to its dynamics within the vesicular aggregate. Soap. (js)