Electrochemical studies of interaction between ceyltrimethylammonium bromide and α-, β-cyclodextrins at various temperature

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• 作者：Gharibi ; H. ; Jalili ; S. ; Rajabi ; T.
• 关键词：Surfactant selective electrode ; Surfactant ; Hexadecyltrimethyl ammonium bromide (HTAB) ; Cyclodextine ; Potentiometry ; Inclusion complex
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2000
• 出版时间：December 30, 2000
• 年：2000
• 卷：175
• 期：3
• 页码：361-369
• 全文大小：123 K

文摘

The adsorption of surfactant (S) to cyclodextrin (CD) is studied using ion selective electrodes. The data obtained indicate that inclusion complexes S(CD) and S(CD)₂ had formed between cetyltrimethyl ammonium bromide (CTAB) and cyclodextrin in aqueous environment. In addition to 1:1 complexes, surfactants form 1:2 complexes with α and β-cyclodextrin as well. Investigation showed that the (K₁) for S(CD), that is the equilibrium constant, is greater than (K₂) for S(CD)₂. Finally thermodynamic parameters for the process (ΔS⁰, ΔH⁰, ΔG⁰) have been calculated.