pH-Switchable IFT variations and emulsions based on the dynamic noncovalent surfactant/salt assembly at the water/oil interface

被引:17
作者
Jia, Han [1 ,2 ]
Leng, Xu [1 ,2 ]
Lian, Peng [1 ,2 ]
Han, Yugui [3 ]
Wang, Qiuxia [3 ]
Wang, Shaoyan [1 ,2 ]
Sun, Tunan [1 ,2 ]
Liang, Yipu [1 ,2 ]
Huang, Pan [1 ,2 ]
Lv, Kaihe [1 ,2 ]
机构
[1] China Univ Petr East China, Minist Educ, Key Lab Unconvent Oil & Gas Dev, Qingdao 266580, Shandong, Peoples R China
[2] China Univ Petr East China, Sch Petr Engn, Shandong Key Lab Oilfield Chem, Qingdao 266580, Shandong, Peoples R China
[3] CNOOC China Ltd, Bohai Oilfield Res Inst, Tianjin 300459, Peoples R China
基金
中国国家自然科学基金;
关键词
PSEUDOGEMINI SURFACTANT; RHEOLOGICAL PROPERTIES; GEMINI SURFACTANTS; WORMLIKE MICELLES; SELF-ASSEMBLIES; ACID; TRANSITION; CONSTRUCTION; TEMPERATURE; BEHAVIOR;
D O I
10.1039/c9sm00891h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Additional HCl can facilely control the dynamic noncovalent interaction between anionic surfactant sodium dodecyl benzene sulfonate (SDBS) and additional organic matter, 4,4'-oxydianiline (ODA), at the water/oil interface. At low HCl concentration (ODA/HCl molar ratio (r) = 1 : 1.5, [ODA] = 250 mg L-1), the ODA(+) ions effectively enhanced the SDBS ability to reduce the water/oil interfacial tension (IFT) by about two orders of magnitude, while the (SDBS)(2)/ODA(2+) gemini-like surfactants could be constructed at a relatively high HCl concentration (r = 1 : 4, [ODA] = 250 mg L-1), which could largely reduce the IFT to 1.19 x 10(-3) mN m(-1). Molecular simulation was employed to explore the interfacial activity of ODA(n+) (ODA(+)/ODA(2+)) ions and the SDBS/ODA(n+) interaction. The control experiments used another three surfactants to verify the proposed model. The pH-switchable gradual protonation of amino groups in ODA molecules determined the SDBS/ODA interfacial assembly, which was responsible for the reversal of IFT variations and the related emulsion behaviors.
引用
收藏
页码:5529 / 5536
页数:8
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