文献类型：期刊文献

英文题名：Interfacial properties and salt tolerance of carboxylated nonylphenol ethoxylate surfactants

作者：Gang, Hong-ze[1,2,4];He, Xiuli[1,2];He, Xiujuan[3];Bao, Xinning[1,2,3];Liu, Jinfeng[1,2,4];Yang, Shizhong[1,2,4];Li, Yingcheng[3];Mu, Bo-Zhong[1,2,4]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Meilong 130, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Meilong 130, Shanghai 200237, Peoples R China;[3]Sinopec Shanghai Res Inst Petrochem Technol, Sinopec Key Lab Surfactants EOR, North Pudong 1658, Shanghai 201208, Peoples R China;[4]East China Univ Sci & Technol, Engn Res Ctr Microbial Enhanced Oil Recovery, MOE, Meilong 130, Shanghai 200237, Peoples R China

年份：2021

卷号：616

外文期刊名：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

收录：;EI(收录号：20210809972062);WOS:【SCI-EXPANDED(收录号:WOS:000635434000003)】；

基金：This research was supported by funding from National Key Research and Development Program of China (No. 2017YFB0308900), National Natural Science Foundation of China (No. 51574125).

语种：英文

外文关键词：Carboxylated nonylphenol ethoxylate; surfactant Number of ethoxy unit; Salt tolerance; Structure-property relationship; Molecular dynamics simulation

摘要：Ionic alkoxy-based surfactants recently attract more attentions because they possess advantages of both nonionic and anionic surfactants, and surfactant structure is the key factor affecting the interfacial property and salt tolerance of ionic alkoxy-based surfactant. In the present study, carboxylated nonylphenol ethoxylate surfactant (NPEOnC, n = 2, 4, and 7) at n-decane/water interface has been studied using molecular dynamics simulation in the absence and in the presence of NaCl with different concentrations. The interfacial activity in reducing interfacial tension and salt tolerance of NPEOnC were investigated and the effect of numbers of ethoxy unit were quantified. The interfacial activities of NPEOnC were demonstrated by the arrangement of surfactant monolayer, the structures of n-decane/water interface, and the interfacial tensions. Salt tolerance of NPEOnC were estimated by the bound pairs between surfactant and water as well as those between surfactant and Na+, especially the structural relaxation dynamics of those bound pairs. Results showed that NPEO7C exhibited the highest activity in lowering the interfacial tension of n-decane/water, and kept the interfacial activity in the presence of NaCl. Carboxyl groups were the predominant groups in binding with Na+, and ethoxy segment within NPEO4C and NPEO7C were the governing groups in being solvated with water. Moreover, the structural relaxations of bound pairs between oxygen within ethoxy segment and water/Na+ were much slower than those between oxygen within carboxyl group and water/Na+, which resulted in the higher salt tolerance of NPEOnC with more ethoxy units.