the National Natural Science Foundation of China(201010113, 21573191);Priority Academic Program Development of Jiangsu Higher Education Institutions and State Key Laboratory of Heavy Oil Processing, China
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu Province, P. R. China
Abstract:
The critical micelle concentrations of binary systems of surface active ionic liquid lauryl isoquinolium bromide ([C12iQuin]Br) with nonionic surfactant Triton X-100 in aqueous solution were investigated by isothermal titration calorimetry. The location of [C12iQuin]Br and Triton X-100 in the mixed micelle was studied using 1H nuclear magnetic resonance (NMR) and two-dimensional nuclear Overhauser enhancement spectroscopy (2D NOESY). It was found that the polyoxyethylene chain of Triton X-100 forms random coils around the isoquinolinium ring. The interaction of molecules in the mixed micelle of [C12iQuin]Br-Triton X-100 was also studied using regular solution theory and the cloud point measurement technique, with comparison to the interaction of doceyl trimethyl ammonium bromide (DTAB)-Triton X-100.
