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Citation: YUAN Han-Zhen, WANG Lin, CHENG ng-Zhen, ZHAO Sui, MAO Shi-Zhen, YU Jia-Yong, DU You-Ru. Microstructures of 2,5-dialkyl Benzene Sulfonate Micelles Studied Using ¹H NMR[J]. Acta Physico-Chimica Sinica, ;2006, 22(12): 1435-1440. doi: 10.1016/S1872-1508(06)60073-9 shu

Microstructures of 2,5-dialkyl Benzene Sulfonate Micelles Studied Using ¹H NMR

1.
(State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China; Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China; College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China)

Received Date: 18 April 2006
Available Online: 6 December 2006

Micellization of a series of newly synthesized dialkyl benzene sulfonates was studied using proton chemical shift changes, spin-lattice, and spin-spin relaxation NMR spectroscopy, and two-dimensional nuclear Overhauser enhancement spectroscopy (2D NOESY). The o-substituted chains are normal alkyl chains with varying lengths, and the m-substituted ones are branched alkyl chains. The results showed that the longer the o-substituted normal alkyl chain, protons of more methylene groups participated in the formation of the rigid surface layer of the hydrophobic micellar core. Consequently, the larger was the area per molecule adsorbed on the interface between oil and water at saturation. The branched m-substituted alkyl chains of the dialkyl benzene sulfonates were less tightly packed than the o-substituted normal alkyl chains in the hydrophobic micellar cores. The shorter the m-substituted branched alkyl chains, the looser they were packed in the hydrophobic micellar core. The relative arrangement of the surfactant molecules in the micelles was elucidated.
- Dialkyl benzene sulfonates;Micellar structure;1H NMR;Relaxation;2D NOESY
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沈阳化工大学材料科学与工程学院沈阳 110142

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Microstructures of 2,5-dialkyl Benzene Sulfonate Micelles Studied Using 1H NMR

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通讯作者: 陈斌, bchen63@163.com

Microstructures of 2,5-dialkyl Benzene Sulfonate Micelles Studied Using ¹H NMR