文献类型：期刊文献

英文题名：Stabilization of 4FS(EO)2 constructed water-in-carbon dioxide microemulsions (W/C μEs) with nonfluorinated co-surfactants

作者：Bao, Lei[1];Chen, Yang[1];Ma, Liru[1];Hu, Dongdong[1];Zong, Yuan[1];Zhao, Ling[1];Yuan, Weikang[1];Liu, Tao[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：148

起止页码：74

外文期刊名：JOURNAL OF SUPERCRITICAL FLUIDS

收录：;EI(收录号：20191106617474);WOS:【SCI-EXPANDED(收录号:WOS:000465053500009)】；

基金：The authors are grateful to the National Natural Science Foundation of China (21676081).

语种：英文

外文关键词：Microemulsions; Supercritical CO2; Molecular dynamics; Nonfluorinated co-surfactants

摘要：Three nonfluorinated co-surfactants, sodium bis (2-(isopropoxy)-ethanol) sulfonate (di-IOESS), sodium bis (3,5,5-trimethyl-hexanol) sulfonate (di-TMHSS) and sodium bis (2-(pivaloyloxy)-ethanol) sulfonate (di-POESS) were synthesized to replace partial sodium bis (3,3,4,4,5,5,6,6,6-nonafluoro-hexanol) sulfonate (4FS(EO)(2)) to stabilize W/C microemulsions to decrease the fluorine content. The results showed that the stabilization ability of the co-surfactants at less than 55 degrees C was in the following order: di-TMHSS > di-POESS > di-IOESS. Results for MD simulations proved that the co-surfactants mainly changed the packing efficiency of the surfactant short chains. The flexible co-surfactant tails could maintain the bending fraction of the surfactant short tail at a low level and the appropriate length of co-surfactant tails helped to occupy more volume at the interface. Therefore, the nonfluorinated co-surfactants with flexible branched tails in an appropriate length relatively to the surfactant tails were conducive to replace partial fluorinated surfactants, which may help for designing nonfluorinated co-surfactants to decrease the fluorine content in W/C microemulsions.