| A model for monomer and micellar concentrations in surfactant solutions: Application to conductivity, NMR, diffusion, and surface tension data. | |
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MedLine Citation:
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PMID: 22265231 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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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. |
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Authors:
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Wajih Al-Soufi; Lucas Piñeiro; Mercedes Novo |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-20 |
Journal Detail:
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Title: Journal of colloid and interface science Volume: - ISSN: 1095-7103 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2012-1-23 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0043125 Medline TA: J Colloid Interface Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Physical Chemistry, Faculty of Science, University of Santiago de Compostela, E-27002 Lugo, Spain. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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