Balance of Coordination and Hydrophobic Interaction in the Formation of Bilayers in Metal-Coordinated Surfactant Mixtures

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• 作者：Hongshan Tian ; Dong Wang ; Wenlong Xu ; Aixin Song ; Jingcheng Hao
• 刊名：Langmuir
• 出版年：2013
• 出版时间：March 19, 2013
• 年：2013
• 卷：29
• 期：11
• 页码：3538-3545
• 全文大小：410K
• 年卷期：v.29,no.11(March 19, 2013)
• ISSN：1520-5827

文摘

Metal鈥搇igand coordination and hydrophobic interaction are two significant driving forces in the aggregation of mixtures of Mⁿ⁺ surfactants and alkyldimethylamine oxide (C_nDMAO) in aqueous solutions. The coordinated systems exhibit rich aggregation behavior. This study investigated the effect of Mⁿ⁺ ions (Zn²⁺, Ca²⁺, Ba²⁺, Al³⁺, Fe³⁺, La³⁺, Eu³⁺, and Tb³⁺) and hydrophobic chains (hydrocarbon and fluorocarbon) on the formation of metal-coordinated bilayers. We found that fluorocarbon chains and branched hydrocarbon chains are preferable to the corresponding linear hydrocarbon chains for the formation of an L_伪 phase. Moreover, L_伪 phases formed by fluorocarbon chains exhibited higher viscoelasticity than ones formed by the hydrocarbons, and the bilayers formed by branched chains were rather flexible, revealing obvious undulation. The construction of bilayers was also strongly affected by metal ions due to their variable coordination ability with C_nDMAO. Our results contribute to the understanding of the formation of metal-coordinated bilayers, which is driven by the interplay of noncovalent forces.