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首页> 外文期刊>Journal of Molecular Liquids >Characterization of mixed micelles of structural isomers of sodium butyl benzene sulfonate and sodium dodecyl sulfate by SANS, FTIR spectroscopy and NMR spectroscopy
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Characterization of mixed micelles of structural isomers of sodium butyl benzene sulfonate and sodium dodecyl sulfate by SANS, FTIR spectroscopy and NMR spectroscopy

机译：SANS，FTIR光谱和NMR光谱表征丁基苯磺酸钠和十二烷基硫酸钠的结构异构体的混合胶束

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摘要

The mixed systems of sodium dodecyl sulfate (SDS) and sodium salts of n-butyl benzene sulfonate (NBBS), iso-butyl benzene sulfonate (IBBS) and tert-butyl benzene sulfonate (TBBS), as hydrotropes, are studied by Small Angle Neutron Scattering (SANS), Fourier Transform Infrared (FTIR) spectroscopy and Nuclear Magnetic Resonance (NMR) spectroscopy for the effect of hydrotrope concentration, hydrotrope structure, and temperature on the SDS micelles. The mixed micelle formation of SDS with NBBS is confirmed with the contrast matching technique. NBBS when mixed with SDS replaces some of the SDS molecules from the micelle affecting its size. The hydrotrope structure shows a prominent effect on the dimensions of the mixed micelle. The behavior of NBBS, in the SDS-NBBS mixtures, is different from that of NaCl and is not the same as the salt effect. Higher temperatures result in the formation of smaller SDS-NBBS mixed micelles in the solutions. The FTIR spectroscopy results indicate enhanced gauche/trans conformer ratio of SDS in the mixed micelles unlike the reduction of the ratio in the mixed micelles of a cationic surfactant with NBBS. The up-field chemical shifts of the aromatic protons of the hydrotrope and the methylene protons of surfactant adjacent to ionic headgroup indicate that the hydrotrope resides near the surface of the SDS micelle.
机译：用小角中子研究了十二烷基硫酸钠（SDS）和正丁基苯磺酸钠（NBBS），异丁基苯磺酸钠（IBBS）和叔丁基苯磺酸钠（TBBS）的钠盐的混合体系。分散液（SANS），傅立叶变换红外（FTIR）光谱和核磁共振（NMR）光谱对水溶助长剂浓度，水溶助长剂结构和温度对SDS胶束的影响。对比匹配技术证实了SDS与NBBS的混合胶束形成。 NBBS与SDS混合后会取代胶束中的一些SDS分子，从而影响其大小。水溶助长剂的结构对混合胶束的尺寸显示出显着的影响。在SDS-NBBS混合物中，NBBS的行为与NaCl的行为不同，并且与盐效应不同。较高的温度导致溶液中形成较小的SDS-NBBS混合胶束。 FTIR光谱结果表明混合胶束中SDS的gauche /反式构象比增加，这与阳离子表面活性剂与NBBS的混合胶束中的比率降低不同。水溶助长剂的芳族质子和与离子头基团相邻的表面活性剂的亚甲基质子的高场化学位移表明，水溶助长剂位于SDS胶束表面附近。

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