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Effect of number of oxypropylene on dynamic interfacial tensions of extended surfactants

Author:
Lv, Mengdie, Luo, Cong, Yang, Jian, Zhou, Yawen, Liu, Changyao, Xu, Baocai
Source:
Colloids and surfaces 2019 v.570 pp. 429-437
ISSN:
0927-7757
Subject:
aqueous solutions, calcium chloride, electrolytes, salinity, sodium chloride, surface tension, surfactants
Abstract:
Effect of the numbers of oxypropylene on dynamic interfacial tensions (IFT) of five extended surfactants C12-14PmE2S (m = 0, 3, 5, 8 and 12) were investigated. The effects of electrolyte (NaCl and CaCl2) concentration, salinity, surfactant concentration were studied in detail. The IFTs between C12-14PmE2S aqueous solutions and n-decane obtained ultralow range at optimum NaCl concentration expect C12-14E2S. The optimum salinity (S*) decreased with increase of number of oxypropylene. Also, the IFTs of C12-14P8E2S and C12-14P12E2S approached or obtained ultralow IFT in a wide range of CaCl2 concentrations. The IFTs between C12-14P12E2S aqueous solution and n-decane decreased as salinity increased. With increasing surfactant concentration, the values of IFT decreased initially and then increased.
Agid:
6340173