Counterion binding and regulation of interactions between charged bilayers

被引:18
作者
Patrick, HN [1 ]
Warr, GG [1 ]
机构
[1] UNIV SYDNEY,DEPT CHEM,SYDNEY,NSW 2006,AUSTRALIA
关键词
D O I
10.1021/jp961157+
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Interactions between didodecyldimethylammonium (DDA) bilayers were measured using osmotic stress in the presence of bromide and chloride as mixed electrolyte. DDA bromide exhibits a discontinuity in its force curve, corresponding to a coexistence region in the DDAB/water phase diagram. whereas DDA chloride has a continuously repulsive interaction profile. Mixed electrolyte systems, interacting at constant electrolyte chemical potential, also display demixing. The selective binding of bromide and chloride in lamellar phases has been measured as a function of interlamellar separation and compared with selective binding to the air/solution interface. A site-binding model was used to interpret the selective binding and osmotic stress results and suggests that these bilayers interact at constant potential.
引用
收藏
页码:16268 / 16274
页数:7
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