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    Electrostatic Screening and Charge Correlation Effects in Micellization of Ionic Surfactants

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    Type
    Article
    Authors
    Jusufi, Arben
    Hynninen, Antti-Pekka
    Haataja, Mikko
    Panagiotopoulos, Athanassios Z.
    KAUST Grant Number
    KUS-CI-018-02
    Date
    2009-05-07
    Permanent link to this record
    http://hdl.handle.net/10754/598152
    
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    Abstract
    We have used atomistic simulations to study the role of electrostatic screening and charge correlation effects in self-assembly processes of ionic surfactants into micelles. Specifically, we employed grand canonical Monte Carlo simulations to investigate the critical micelle concentration (cmc), aggregation number, and micellar shape in the presence of explicit sodium chloride (NaCl). The two systems investigated are cationic dodecyltrimethylammonium chloride (DTAC) and anionic sodium dodecyl sulfate (SDS) surfactants. Our explicit-salt results, obtained from a previously developed potential model with no further adjustment of its parameters, are in good agreement with experimental data for structural and thermodynamic micellar properties. We illustrate the importance of ion correlation effects by comparing these results with a Yukawa-type surfactant model that incorporates electrostatic screening implicitly. While the effect of salt on the cmc is well-reproduced even with the implicit Yukawa model, the aggregate size predictions deviate significantly from experimental observations at low salt concentrations. We attribute this discrepancy to the neglect of ion correlations in the implicit-salt model. At higher salt concentrations, we find reasonable agreement of the Yukawa model with experimental data. The crossover from low to high salt concentrations is reached when the electrostatic screening length becomes comparable to the headgroup size. © 2009 American Chemical Society.
    Citation
    Jusufi A, Hynninen A-P, Haataja M, Panagiotopoulos AZ (2009) Electrostatic Screening and Charge Correlation Effects in Micellization of Ionic Surfactants. J Phys Chem B 113: 6314–6320. Available: http://dx.doi.org/10.1021/jp901032g.
    Sponsors
    This publication is based on work supported by the Princeton Center for Complex Materials (Grant NSF DMR 0213706), the Department of Energy (Grant DE-FG02-01ER15121), and by Award No. KUS-CI-018-02, made by King Abdullah University of Science and Technology (KAUST). A.J. gratefully acknowledges financial support from the Deutsche Forschungsgemeinschaft.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry B
    DOI
    10.1021/jp901032g
    PubMed ID
    19361177
    ae974a485f413a2113503eed53cd6c53
    10.1021/jp901032g
    Scopus Count
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