Redox-Controllable Interfacial Properties of Zwitterionic Surfactant Featuring Selenium Atoms

被引:50
作者
Kong, Weiwei [1 ]
Guo, Shuang [1 ]
Wu, Shaoqi [1 ]
Liu, Xuefeng [1 ]
Zhang, Yongmin [1 ]
机构
[1] Jiangnan Univ, Sch Chem Mat Engn, Key Lab Food Colloids & Biotechnol, Minst Educ, Wuxi 214122, Peoples R China
基金
中国国家自然科学基金;
关键词
STEARIC-ACID SOAP; WORMLIKE MICELLES; RESPONSIVE SURFACTANTS; SYSTEMS; AGGREGATION; MIXTURES; TENSION; FLUIDS; SALT;
D O I
10.1021/acs.langmuir.6b02616
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Control of interfacial properties (foaming and emulsification) plays an important role in industry. Here we developed a novel redox-responsive surfactant, 3-(11-benzyl-selanyl-undecyl)-dimethylammonium acetate (BSeUCB), using selenium atoms as an environmentally sensitive group. In a reduced state, BSeUCB aqueous solution showed good foaming and emulsification abilities as well as conventional betaine surfactants. After oxidization, BSeUCB transformed into a bola-type structure because of the presence of a new hydrophilic group (selenoxide), and thus the critical micellar concentration, equilibrium surface/interfacial tension, and molecular area at the interface correspondingly increase from 0.32 mM, 46.43 mN.m(-1), 5.30 mN.m(-1), and 0.61 nm(2) to 4.98 mM, 59.15 mN.m(-1), 18.29 mN.m(-1), and 1.22 nm(2), respectively, resulting in a greater amount of energy input required to produce foam or emulsion, and a less dense adsorption layer, i.e., poor foaming and emulsification ability. Such a conversion was reversibly controlled by simply adding a trace amount (<0.06 wt % of the dispersion) of oxidant (H2O2) and reductant (Na2SO3). The products of the redox reaction did not interfere in the switchability except at the first cycle. The oxidization was generally time-consuming, whereas the reduction was very fast.
引用
收藏
页码:9846 / 9853
页数:8
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