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Selectivity and Stoichiometry Boosting of beta-Cyclodextrin in Cationic/Anionic Surfactant Systems: When Host-Guest Equilibrium Meets Biased Aggregation Equilibrium
Jiang, Lingxiang1; Yan, Yun1; Huang, Jianbin1; Yu, Caifang2; Jin, Changwen2; Deng, Manli3; Wang, Yilin3
2010-02-18
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
ISSN1520-6106
Volume114Issue:6Pages:2165-2174
AbstractCationic 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.
DOI10.1021/jp911092y
Indexed BySCI
Language英语
WOS IDWOS:000274355400010
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:33[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/71080
Collection中国科学院化学研究所
Corresponding AuthorHuang, Jianbin
Affiliation1.Peking Univ, BNLMS, State Key Lab Struct Chem Unstable & Stable Speci, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
2.Peking Univ, Beijing NMR Ctr, Coll Life Sci, Beijing 100871, Peoples R China
3.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
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,2010,114(6):2165-2174.
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,114(6),2165-2174.
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 114.6(2010):2165-2174.
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