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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Effects of Concentration and Temperature on SDS Monolayers at the Air-Solution Interface Studied by Infrared External Reflection Spectroscopy
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Effects of Concentration and Temperature on SDS Monolayers at the Air-Solution Interface Studied by Infrared External Reflection Spectroscopy

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摘要

Infrared external reflection (IER) spectra of sodium dodecyl sulfate (SDS) monolayers at the air-solution interface and infrared transmission spectra of the corresponding aqueous solutions were measured at various SDS concentrations and temperatures.A comparison between the spectra of adsorbed monolayers and bulk solutions revealed that the conformational order of the SDS alkyl-chain at the air-solution interface improved with increasing the SDS concentrations,up until the saturation adsorption,and that the conformational order of the adsorbed SDS monolayer was higher than those of monomers and micelles.In addition,below the Krafft point temperature,the adsorbed SDS was maintained in the liquid crystal state,while SDS in the bulk solution was in the crystalline state.Furthermore,the SDS adsorption density was evaluated based on the IER band intensities of the insoluble monolayer of tridecanoic acid with an identical alkyl chain length to SDS.

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