Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (6): 1205-1213.doi: 10.3866/PKU.WHXB201702222

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Redox-Responsive Interfacial Properties of Se-Containing Sulfobetaine Surfactant

Wei-Wei KONG,Shuang GUO,Yong-Min ZHANG*(),Xue-Feng LIU*()   

  • Received:2016-12-27 Published:2017-05-19
  • Contact: Yong-Min ZHANG,Xue-Feng LIU;


Because of good biocompatibility using Se atom as the redox-responsive group has aroused considerable attention. However, only a few efforts have been devoted to Se-containing surfactant, especially for smart control of interfacial properties. This paper focuses on the redox-responsive behaviors of molecular structure, Krafft temperature, Surface/interfacial tension, foaming and emulsification of Se-containing zwitterionic surfactant, benzylselanyl-undecyl-dimethyl ammonium propane sulfonate (BSeUSB). The results show that after oxidization with a trace of H2O2 (≤0.056% of total mass), reduced form BSeUSB with one hydrophilic head and one hydrophobic tail transformed to Bola-type oxidized form BSeUSB-Ox due to the presence of a new hydrophilic group (selenoxide). And thus Krafft temperature decreased from (23.5±0.5)℃ to less than 0℃. The surface/interfacial tension at 5.00 mmol·L-1 increased from 45.15, 5.52 mN·m-1 to 61.63, 18.38 mN·m-1, respectively. Macroscopically, reduced form BSeUSB has good foaming and emulsification properties, while the foaming and emulsification abilities of oxidized form BSeUSB-Ox almost disappeared. Interestingly the molecular structure and the solution properties re-turned the initial states after reduction with a trace of Na2SO3 (≤0.060% of total mass). In a word, by the addition trace amounts of H2O2 and Na2SO3 alternately, we have achieved the smart control of the interfacial properties of the surfactant.

Key words: Redox-responsive, Se-containing surfactant, Betaine, Interfacial property, Foam, Emulsion


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