含硒磺基甜菜碱表面活性剂界面性能的氧化-还原响应行为

doi:10.3866/PKU.WHXB201702222

摘要/Abstract

摘要：

硒，作为一种新的氧化-还原响应位点因其良好的生物相容性日益引起人们的关注，然而，对这种新型氧化-还原响应型表面活性剂的研究相对较少，尤其是其界面性能的智能调控。本文以含硒两性离子表面活性剂苄基十一烷基磺基甜菜碱（BSeUSB）为对象，研究了其分子结构、Krafft温度、表/界面张力及发泡和乳化性能的氧化-还原刺激响应行为。发现在极微量的H₂O₂（≤体系总质量的0.056%）氧化下，BSeUSB分子中疏水的-Se-C-键转变成了具有一定亲水能力的Se=O键，表面活性剂从单头单尾的还原态变成了类Bola型的氧化态，导致表面活性剂的Krafft温度由（23.5±0.5）℃下降至0℃以下，5.00 mmol·L^-1时的表/界面张力分别从45.15、5.52 mN·m^-1升高至61.63、18.38 mN·m^-1。宏观上，还原态具有良好的发泡和乳化性能，而氧化态的发泡和乳化能力几乎消失。再次加入极少量还原剂Na₂SO₃（≤体系总质量的0.060%）后，分子的微观结构和溶液性能又可恢复到初始状态。总之，通过极微量H₂O₂和Na₂SO₃的交替加入，我们实现了该表面活性剂界面性能的智能调控。

关键词: 氧化-还原响应, 含硒表面活性剂, 甜菜碱, 界面性能, 泡沫, 乳液

Abstract:

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

MSC2000:

O648

孔伟伟,郭爽,张永民,刘雪锋. 含硒磺基甜菜碱表面活性剂界面性能的氧化-还原响应行为[J]. 物理化学学报, 2017, 33(6): 1205-1213.

Wei-Wei KONG,Shuang GUO,Yong-Min ZHANG,Xue-Feng LIU. Redox-Responsive Interfacial Properties of Se-Containing Sulfobetaine Surfactant[J]. Acta Phys. -Chim. Sin., 2017, 33(6): 1205-1213.

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