通过添加铜（II）离子在不同pH值下对羧酸型双子表面活性剂进行可控组装。

Controllable organization of a carboxylic acid type gemini surfactant at different pH values by adding Copper(II) ions.

作者信息

Huang Xu, Cao Meiwen, Wang Jinben, Wang Yilin

机构信息

Key Laboratory of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.

出版信息

J Phys Chem B. 2006 Oct 5;110(39):19479-86. doi: 10.1021/jp0630121.

DOI:10.1021/jp0630121

PMID:17004808

Abstract

The gemini surfactant sodium 4,8-dioctyl-3,9-dioxo-6-hydroxy-4,8-diaza-1,11-undecanedicarboxylate (SDUC), bearing two carboxylic headgroups and two hydrocarbon chains, has been synthesized, and its self-organization characteristics at strong basic and neutral environments have been studied. The results reveal that a transition from micelles to vesicles in SDUC aqueous solution occurs when the pH drops from 12.0 to 7.0. When a small amount of Cu(2+) ion is added to the SDUC solutions at both pH 12.0 and 7.0, remarkable transformations were observed within the SDUC aggregate structures. At pH 12.0, micelles transform into vesicles as Cu(2+) is added, while the vesicles of SDUC are formed at pH 7.0 and these small vesicles tend to fuse into larger ones slowly. Moreover, these SDUC vesicles at pH 7.0 undergo a relatively fast fission process when Cu(2+) is added in. An attempt has been made to explain the mechanism of these transformations.

摘要

已合成了带有两个羧基头基和两条烃链的双子表面活性剂4,8 - 二辛基 - 3,9 - 二氧代 - 6 - 羟基 - 4,8 - 二氮杂 - 1,11 - 十一烷二羧酸钠（SDUC），并研究了其在强碱性和中性环境下的自组装特性。结果表明，当pH值从12.0降至7.0时，SDUC水溶液中会发生从胶束到囊泡的转变。当在pH值为12.0和7.0的SDUC溶液中加入少量Cu(2+)离子时，在SDUC聚集体结构中观察到了显著的转变。在pH值为12.0时，加入Cu(2+)时胶束会转变为囊泡，而在pH值为7.0时会形成SDUC囊泡，并且这些小囊泡会慢慢融合成更大的囊泡。此外，当加入Cu(2+)时，pH值为7.0的这些SDUC囊泡会经历一个相对快速的裂变过程。已尝试解释这些转变的机制。