Citation:
	            
		            KONG Wei-Wei,  GUO Shuang,  ZHANG Yong-Min,  LIU Xue-Feng. Redox-Responsive Interfacial Properties of Se-Containing Sulfobetaine Surfactant[J]. Acta Physico-Chimica Sinica,
							;2017, 33(6): 1205-1213.
						
							doi:
								10.3866/PKU.WHXB201702222
						
					
				
					
				
	        
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	                	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.
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								Keywords:
								
 - Redox-responsive,
 - Se-containing surfactant,
 - Betaine,
 - Interfacial property,
 - Foam,
 - Emulsion
 
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