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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2014,Vol.30>> Issue(12)>> 2291-2299     doi: 10.3866/PKU.WHXB201410222         中文摘要
Effect of the Surfactant C12mimBr on the Aggregation Behavior of Gemini12-2-12 at an Air/Water Interface, Investigated Using an Interfacial Dilational Rheology Method
YUE Ling, HE Zi-Meng, WANG Yu-Qin, SHANG Ya-Zhuo, LIU Hong-Lai
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
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The dynamic interfacial tension, dilational rheological properties, and interfacial relaxation processes of quaternary ammonium Gemini surfactant C12-(CH2)2-C12·2Br (Gemini12-2-12) solutions and Gemini12-2-12/ ionic liquid surfactant C12mimBr mixed systems at an air/water interface were investigated using an interfacial dilational rheology method at low frequencies (0.02-0.50 Hz). The effect of the C12mimBr on the interfacial properties of the Gemini12-2-12/C12mimBr mixed systems, and the mechanism responsible for the influence of C12mimBr on the aggregation behavior of the Gemini12-2-12 at the air/water interface, are discussed here. The experimental results showed that with increasing the amount of C12mimBr, the time required to achieve interfacial adsorption equilibrium for the mixed systems was reduced, the dilational moduli and phase angle in the mixed systems decreased, and the interfacial adsorption films were inclined to become elastic. Simultaneously, the relaxation processes at the interface or near the interface changed significantly, the slow relaxation process disappeared, and a fast relaxation process dominated the properties of the interfacial films. Moreover, the contribution of the fast relaxation process increased with increasing the concentration of C12mimBr. The abovementioned changes in the interfacial properties were mainly attributed to the participation of the C12mimBr in the formation of the interface, and the competitive adsorption of the two surfactants at the air/water interface. At lower concentrations of C12mimBr, the C12mimBr molecules filled the vacancies between the Gemini12-2-12 molecules when the Gemini12-2-12 molecules were loosely arranged at the interface, and mixedadsorption films formed from C12mimBr and Gemini12-2-12 spread on the air/water interface. With increasing the concentration of C12mimBr, the alkyl chains of the Gemini12-2-12 molecules that were wrapped around each other at the air/water interface untangled, and the Gemini12-2-12 molecules underwent desorption from the interface. At the same time, C12mimBr molecules replaced Gemini12-2-12 molecules, because of their low steric hindrance and strong hydrophobic effects; ultimately, C12mimBr molecules almost entirely occupied the air/water interface.



Keywords: Ionic liquid surfactant   Gemini surfactant   Competitive adsorption   Interface behavior   Dilational rheological property  
Received: 2014-09-29 Accepted: 2014-10-21 Publication Date (Web): 2014-10-22
Corresponding Authors: SHANG Ya-Zhuo Email: shangyazhuo@ecust.edu.cn

Fund: The project was supported by the National Natural Science Foundation of China (21173079, 91334203, 21476072).

Cite this article: YUE Ling, HE Zi-Meng, WANG Yu-Qin, SHANG Ya-Zhuo, LIU Hong-Lai. Effect of the Surfactant C12mimBr on the Aggregation Behavior of Gemini12-2-12 at an Air/Water Interface, Investigated Using an Interfacial Dilational Rheology Method[J]. Acta Phys. -Chim. Sin., 2014,30 (12): 2291-2299.    doi: 10.3866/PKU.WHXB201410222

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