高压气体对离子型和非离子型表面活性剂胶束的溶胀作用。

Swelling of ionic and nonionic surfactant micelles by high pressure gases.

机构信息

Materials and Supercritical Fluids Group, Department of Chemistry, Tyndall National Institute, University College Cork, Cork, Ireland.

出版信息

Langmuir. 2010 Jun 1;26(11):7725-31. doi: 10.1021/la904464k.

DOI:10.1021/la904464k

PMID:20148596

Abstract

The influence of different solvent environments on the size, shape, and characteristics of surfactant micelles of Pluronic F127 and CTAB was investigated by small-angle neutron scattering (SANS). SANS experiments were undertaken on dilute micellar surfactant solutions of F127 and CTAB that between them were exposed to liquid and supercritical carbon dioxide, liquid propane, ethane, and heptane under various pressures and temperatures. Swelling of the surfactant micelles could be directly related to the solubility of the solvents within the micelles, especially within their cores. Carbon dioxide produced the largest swelling of the Pluronic F127 micelles, compared to propane and ethane, which mirrors the solubility of the gases in the PPO core of the micelles. Conversely, the extent of swelling of the cores of CTAB micelles was greater with propane compared to carbon dioxide, which again relates to the solubility of the solvents in the alkane core of the CTAB micelles.

摘要

通过小角中子散射（SANS）研究了不同溶剂环境对 Pluronic F127 和 CTAB 表面活性剂胶束的大小、形状和特性的影响。在不同压力和温度下，对 F127 和 CTAB 的稀胶束表面活性剂溶液进行了 SANS 实验，这些溶液分别暴露于液体和超临界二氧化碳、液体丙烷、乙烷和庚烷中。胶束的溶胀可以直接与溶剂在胶束内的溶解度相关，特别是在胶束核内的溶解度相关。与丙烷和乙烷相比，二氧化碳使 Pluronic F127 胶束的溶胀最大，这与气体在胶束的 PPO 核中的溶解度相对应。相反，与二氧化碳相比，丙烷使 CTAB 胶束核的溶胀程度更大，这再次与溶剂在 CTAB 胶束的烷核中的溶解度相关。