An NMR Study on Two Mixed Micelles Formed by Nonionic Surfactants

• Main Authors: ZHAO Rui-ge, ZHANG Wei-hong, MA Er-qian, YU Hai-tao, YANG Qiu-qing
• Format: Article
• Language: zho
• Published: Science Press 2018-03-01
• Series: Chinese Journal of Magnetic Resonance
• Subjects: NMR; Tween40; C10E6; NP-10; mixed micelles; interaction; dynamic change
• Online Access: http://121.43.60.238/bpxzz/EN/10.11938/cjmr20172587

NMR techniques were used to study the relative arrangement and interaction sites in mixed micelles formed in NP-10/Tween40 and NP-10/C10E6 aqueous solutions. The results of two-dimensional NOESY experiments and relaxation time measurements showed that the interaction site of these two pairs of mixed surfactants were similar, but the intermolecular interaction between NP-10 and Tween40 was stronger than that between NP-10 and C10E6. T2 measurements demonstrated that inter-heteromolecular interactions decreased when the molar concentrations of Tween40 and C10E6 were larger than 2 and 4 folds of that of NP-10, respectively. Under such circumstances, the inter-homomolecular interactions began to play a key role, indicative of the ideal mixture molar ratio and the change of synergistic effect in the complex systems. T2/T1 ratio measurements indicated that molecular chain movement in the NP-10/Tween40 mixture was more limited than that in the NP-10/C10E6 mixture. The above conclusions were verified by spatial distance measurements.