期刊
COLLOID JOURNAL
卷 75, 期 5, 页码 532-537出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S1061933X13050037
关键词
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资金
- Presidential Program in Support of Leading Scientific Schools of the Russian Federation [NSh-4464.2012.3]
- Russian Foundation for Basic Research [12-03-00701-a]
Proton chemical shifts of different atomic groups in sodium dodecyl sulfate (SDS) have been studied by H-1 NMR spectroscopy as functions of surfactant concentration in aqueous solutions. Three surfactant concentration ranges of the chemical shifts have been revealed. The first range corresponds to the premicellar solutions, the second one is in the vicinity of critical micelle concentration (CMC1), and the third range corresponds to high surfactant concentrations, at which intermicellar interactions play a significant role. The parameters of SDS association (CMC1 and CMC2) determined based on the concentration dependences of the chemical shifts are in satisfactory agreement with the data available from the literature. The concept of critical dimerization concentration (CDC) has been introduced for the first concentration range. The values of CDC and dimerization constant K (2) (210 x 60 dm(3)/mol) have been estimated within the framework of the two-state model.
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