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… Click to show full abstract
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.
Journal Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Year Published: 2019
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