Rich aggregate morphologies induced by organic salts in aqueous solutions of a cationic gemini surfactant with a short spacer

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• 作者：Rong Jiang ; Jianxi Zhao ; Xiaoming Hu ; Xiaomei Pei ; Lixiang Zhang
• 关键词：Rich aggregate morphologies ; Gemini surfactant with a short spacer ; Organic sulfonate salt
• 刊名：Journal of Colloid and Interface Science
• 出版年：2009
• 出版时间：1 December 2009
• 年：2009
• 卷：340
• 期：1
• 页码：98-103
• 全文大小：436 K

文摘

Various aggregates, such as spherical and elongated micelles, tubular and rodlike aggregates, as well as vesicles, are induced by adding sodium 2-naphthalenesulfonate (SNphs) or sodium benzenesulfonate (SBzs) into the aqueous solution of a gemini surfactant C₁₂C₂C₁₂(Me) (1,2-ethanediyl-bis-(dodecyldimethylammonium bromide)). The aggregate morphology strongly depends on the added amount of the organic salts. Among the various aggregates, the elongated micelle and the tubular aggregate have larger solubilizing capacities than those with the other morphologies. However, SNphs and SBzs cannot induce similar aggregate transitions for the systems of C₁₂C_sC₁₂(Me) (s = 6, 8, 12). The possible mechanism of these phenomena is proposed based on the results of UV spectra and ¹H NMR measurements and the molecular packing geometry rule.