Surface Activity and Aggregation Behavior of Siloxane-Based Ionic Liquids in Aqueous Solution

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• 作者：Guoyong Wang ; Ping Li ; Zhiping Du ; Wanxu Wang ; Guojin Li
• 刊名：Langmuir
• 出版年：2015
• 出版时间：August 4, 2015
• 年：2015
• 卷：31
• 期：30
• 页码：8235-8242
• 全文大小：511K
• ISSN：1520-5827

文摘

Six novel siloxane-based surface-active ionic liquids (SAILs)鈥攕iloxane ammonium carboxylate [Si(n)N(2)-CA(1), (n = 3, 4)]鈥攚ere designed and synthesized. Their melting points, surface activities, and self-aggregation behavior in aqueous solution were studied. The results showed that because of the bulky hydrophobic siloxane chains at the end of the tail, all six siloxane-based SAILs are room-temperature ionic liquids (RT-SAILs). The introduction of the siloxane group can reduce the melting point of ionic liquids to below room temperature and can promote the micellization and aggregation behavior more efficiently. These siloxane-based SAILs can greatly reduce the surface tension of water, as shown by the critical aggregation concentration (纬_CAC) values of 20 mN路m^鈥?; all six siloxane RT-SAILs can form a vesicle spontaneously in aqueous solution, indicating potential uses as model systems for biomembranes and vehicles for drug delivery.