An NMR Study on Two Mixed Micelles Formed by Nonionic Surfactants

doi:10.11938/cjmr20172587

Abstract

Abstract: 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.

Key words: NMR, Tween40, C₁₀E₆, NP-10, mixed micelles, interaction, dynamic change

CLC Number:

O482.53

ZHAO Rui-ge, ZHANG Wei-hong, MA Er-qian, YU Hai-tao, YANG Qiu-qing. An NMR Study on Two Mixed Micelles Formed by Nonionic Surfactants[J]. Chinese Journal of Magnetic Resonance, 2018, 35(1): 81-89.

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