학술논문
Association of sodium dodecyl sulfate in aqueous solutions according to chemical shifts in H NMR spectra.
Document Type
Article
Author
Source
Subject
*SODIUM dodecyl sulfate
*AQUEOUS solutions
*NUCLEAR magnetic resonance spectroscopy
*CHEMICAL shift (Nuclear magnetic resonance)
*CRITICAL micelle concentration
*INTERMOLECULAR interactions
*DIMERIZATION
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Language
ISSN
1061-933X
Abstract
Proton chemical shifts of different atomic groups in sodium dodecyl sulfate (SDS) have been studied by H 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 (CMC), and the third range corresponds to high surfactant concentrations, at which intermicellar interactions play a significant role. The parameters of SDS association (CMC and CMC) 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(210 × 60 dm/mol) have been estimated within the framework of the two-state model. [ABSTRACT FROM AUTHOR]