化学
水溶液
表面张力
临界胶束浓度
胶束化热力学
肺表面活性物质
芘
胶束
聚合数
吸附
氢键
电导率
同系序列
分子间力
物理化学
分子
有机化学
热力学
物理
生物化学
作者
Tian‐Hua Zhou,Shengwei Liu,Yi You,Rong Xu,Jianxi Zhao
标识
DOI:10.1021/acs.jced.5b00778
摘要
The micellization of a homologous series of heterogemini surfactants, CmOhpNCn (m, n = 10, 8; 12, 8; 14, 8; 16, 8; and 10, 14), in aqueous solution and their adsorption at the air/water interface have been investigated by surface tension, conductivity, and fluorescence techniques. The surface tension curves of C16OhpNC8 and C10OhpNC14 showed two break points, corresponding to the critical concentration of the premicellar aggregation and the general micellization, respectively. The results of conductivity and fluorescence spectra using pyrene as probe confirmed the premicellization behavior in the two cases. This indicated that these surfactants have strong aggregation ability in the solution. The micelle formed nearby the cmc displayed only a small aggregation number but a large ionization degree. The C20 that characters the efficiency in surface tension reduction was quite small in comparison with those of conventional surfactant and even smaller than those of symmetric gemini surfactants such as 12-s-12 homologous. The special molecular packing of CmOhpNCn in aqueous solution was closely related to the intermolecular hydrogen bonding and a weak electrostatic repulsion.
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