期刊论文详细信息
JOURNAL OF COLLOID AND INTERFACE SCIENCE 卷:370
A model for monomer and micellar concentrations in surfactant solutions: Application to conductivity, NMR, diffusion, and surface tension data
Article
Al-Soufi, Wajih1  Pineiro, Lucas1  Novo, Mercedes1 
[1] Univ Santiago de Compostela, Fac Sci, Dept Phys Chem, E-27002 Lugo, Spain
关键词: Surfactants;    Micelles;    Critical micelle concentration;    Concentration model;    Data analysis;   
DOI  :  10.1016/j.jcis.2011.12.037
来源: Elsevier
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【 摘 要 】

An empirical model for the concentrations of monomeric and micellized surfactants in solution is presented as a consistent approach for the quantitative analysis of data obtained with different experimental techniques from surfactant solutions. The concentration model provides an objective definition of the critical micelle concentration (cmc) and yields precise and well defined values of derived physical parameters. The use of a general concentration model eliminates subjective graphical procedures, reduces methodological differences, and thus allows one to compare directly the results of different techniques or to perform global fits. The application and validity of the model are demonstrated with electrical conductivity, surface tension, NMR chemical shift, and self-diffusion coefficient data for the surfactants SDS, CTAB, DTAB, and LAS. In all cases, the derived models yield excellent fits of the data. It is also shown that there is no need to assume the existence of different premicellar species in order to explain the chemical shifts and self-diffusion coefficients of SDS as claimed recently by some authors. (C) 2011 Elsevier Inc. All rights reserved.

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