Selectivity and Stoichiometry Boosting of beta-Cyclodextrin in   Cationic/Anionic Surfactant Systems: When Host-Guest Equilibrium Meets   Biased Aggregation Equilibrium

doi:10.1021/jp911092y

CORC > 北京大学 > 化学与分子工程学院

	Selectivity and Stoichiometry Boosting of beta-Cyclodextrin in Cationic/Anionic Surfactant Systems: When Host-Guest Equilibrium Meets Biased Aggregation Equilibrium
	Jiang, Lingxiang ; Yan, Yun ; Huang, Jianbin ; Yu, Caifang ; Jin, Changwen ; Deng, Manli ; Wang, Yilin
刊名	journal of physical chemistry b
	2010
关键词	SODIUM DODECYL-SULFATE ALPHA-CYCLODEXTRIN DODECYLTRIMETHYLAMMONIUM BROMIDE INCLUSION COMPLEXES ANIONIC SURFACTANTS AQUEOUS MIXTURES PHASE-BEHAVIOR MIXED SYSTEMS VESICLES MICELLES
DOI	10.1021/jp911092y
英文摘要	Cationic surfactant/anionic surfactant/beta-CD ternary aqueous systems provide a platform for the coexistence of the host-guest (beta-CD/surfactant) equilibrium and the biased aggregation (monomeric/aggregated surfactants) equilibrium. We report here that the interplay between the two equilibria dominates the systems as follows. (1) The biased aggregation equilibrium imposes an apparent selectivity on the host-guest equilibrium, namely, beta-CD has to always selectively bind the major surfactant (molar fraction > 0.5) even if binding constants of beta-CD to the pair of surfactants are quite similar. (2) In return, the host-guest equilibrium amplifies the bias of the aggregation equilibrium, that is, the selective binding partly removes the major surfactant from the aggregates and leaves the aggregate composition approaching the electroneutral mixing stoichiometry. (3) This composition variation enhances electrostatic attractions between oppositely charged surfactant head groups, thus resulting in less-curved aggregates. In particular, the present apparent host-guest selectivity is of remarkably high values, and the selectivity stems from the bias of the aggregation equilibrium rather than the difference in binding constants. Moreover, beta-CD is defined as a "stoichiometry booster" for the whole class of cationic/anionic surfactant systems, which provides an additional degree of freedom to directly adjust aggregate compositions of the systems. The stoichiometry boosting of the compositions can in turn affect or even determine microstructures and macroproperties of the systems.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000274355400010&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Chemistry, Physical; SCI(E); EI; PubMed; 21; ARTICLE; 6; 2165-2174; 114
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/150114]
专题	化学与分子工程学院生命科学学院
推荐引用方式 GB/T 7714	Jiang, Lingxiang,Yan, Yun,Huang, Jianbin,et al. Selectivity and Stoichiometry Boosting of beta-Cyclodextrin in Cationic/Anionic Surfactant Systems: When Host-Guest Equilibrium Meets Biased Aggregation Equilibrium[J]. journal of physical chemistry b,2010.
APA	Jiang, Lingxiang.,Yan, Yun.,Huang, Jianbin.,Yu, Caifang.,Jin, Changwen.,...&Wang, Yilin.(2010).Selectivity and Stoichiometry Boosting of beta-Cyclodextrin in Cationic/Anionic Surfactant Systems: When Host-Guest Equilibrium Meets Biased Aggregation Equilibrium.journal of physical chemistry b.
MLA	Jiang, Lingxiang,et al."Selectivity and Stoichiometry Boosting of beta-Cyclodextrin in Cationic/Anionic Surfactant Systems: When Host-Guest Equilibrium Meets Biased Aggregation Equilibrium".journal of physical chemistry b (2010).