Design of a Salt-tolerant Gemini viscoelastic surfactant and the study of Construction of Wormlike Micelle structure in High-salinity aqueous environment
Design of a Salt-tolerant Gemini viscoelastic surfactant and the study of Construction of Wormlike Micelle structure in High-salinity aqueous environment
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DOI：
10.1016/j.colsurfa.2021.127653
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发表时间：
2021-10
期刊：
影响因子：
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通讯作者：
Wenlong Zhang;Jincheng Mao;Jia Zhenfu;Xiaojiang Yang;Peng Zhang;X. Su;C. Zhou;D. Bao;W. Zeng
中科院分区：
文献类型：
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作者：
Wenlong Zhang;Jincheng Mao;Jia Zhenfu;Xiaojiang Yang;Peng Zhang;X. Su;C. Zhou;D. Bao;W. Zeng
Herein, a zwitterionic Gemini VES (named VES-C) with double ultra-long hydrophobic tails was designed and synthesized which aimed to construct WLM net-structures in high-salinity aqueous solution. Due to the carboxylic group on the spacer, it exhibits partial carboxyl betaine properties and performs well in high salinity environment. Molecular dynamic simulation was carried out and RDF curves were analyzed to predict and explain the mechanism of salinity tolerance of VES-C. Compared with cationic Gemini VESs, a series of experiments were conducted by varying salinity, including surface tension,DLS,1HNMRand fluorescent probe, to explain the salt-tolerance mechanism of VES-C. The salinity cloudy point of VES-C surpasses 10 wt%, exhibiting superior salt-tolerance to those cationic Gemini VESs. Trough viscosity measurement, oscillatory measurement and microstructure observation, it proves that VES-C molecules can constructWLMnetlike structures within the salinity range from 3 wt% to 10 wt% (optimal salinity: 4 wt%), thus VES-C can be applied as the clean thickener to prepared seawater or brine based fracturing fluid by constructingWLMnetlike structure in high salinity aqueous environment, which leaves the preparation of clean fracturing fluid independent of freshwater resources.
