AOT反胶束溶液中的压缩二氧化碳：对稳定性、渗滤和尺寸的影响

Compressed CO2 in AOT reverse micellar solution: effect on stability, percolation, and size.

作者信息

Shen Dong, Han Buxing, Dong Yu, Chen Jiawei, Mu Tiancheng, Wu Weize, Zhang Jianling, Wu Zhonghua, Dong Baozhong

机构信息

The Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.

出版信息

J Phys Chem B. 2005 Mar 31;109(12):5796-801. doi: 10.1021/jp044874+.

DOI:10.1021/jp044874+

PMID:16851631

Abstract

The effects of compressed CO(2) in sodium bis-2-ethylhexylsulfosuccinate (AOT)/decane reversed micellar solution on the stability of the micelles, interface, and micelle/micelle interactions were studied. It was demonstrated that the compressed gas could increase the solubilization of water in this system. The formation of the stabilized one-phase microemulsion was confirmed by conductivity measurements. A shift in percolation threshold to higher temperature was observed after compressed gas was added. The gyration radius (R(g)) of the reverse micelles was determined using SAXS. R(g) increases with the addition of water, while it decreases appreciably with increasing pressure of compressed gas at fixed W(0). These results were interpreted in terms of an increase of the rigidity of the interface layer and a decrease of the interdroplet attraction. The results of this work provide useful information to get insight into the mechanism of cosurfactants to stabilize reverse micelles.

摘要

研究了压缩二氧化碳在双（2-乙基己基）磺基琥珀酸钠（AOT）/癸烷反胶束溶液中对胶束稳定性、界面以及胶束/胶束相互作用的影响。结果表明，压缩气体可增加该体系中水的增溶量。通过电导率测量证实了稳定单相微乳液的形成。添加压缩气体后，渗滤阈值向更高温度移动。利用小角X射线散射（SAXS）测定了反胶束的回转半径（R(g)）。R(g) 随水的加入而增大，而在固定W(0) 时，随压缩气体压力的增加而明显减小。这些结果可通过界面层刚性增加和液滴间吸引力减小来解释。这项工作的结果为深入了解助表面活性剂稳定反胶束的机理提供了有用信息。