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Dynamic light scattering study of cetyltrimethylammonium bromide aqueous solutions

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Abstract

Cetyltrimethylammonium bromide (CTAB) aqueous solutions are studied by dynamic light scattering method in a wide concentration range covering the first and second critical micelle concentrations (CMC1 and CMC2, respectively). Nonmonotonic and ambiguous behavior of diffusion coefficients D with an increase in concentrations above CMC1 is revealed. An increase in the D values in the first decade of CTAB concentration above CMC1 agrees with known published data for aqueous solutions of ionic surfactants. It is shown that an increase in the ionic strength of solution with the addition of KBr leads to a decrease in the positive slope of the dependence of diffusion coefficients on CTAB concentration up to zero at 0.05 M KBr. Two relaxation processes corresponding to large and small D values are simultaneously observed in micellar solutions, beginning with 0.03 M CTAB concentration. The data obtained are compared with published data, as well as with the results of viscosity measurements. The performed analysis indicates that the observed relaxation processes are explained by the coexistence of spherical and nonspherical micelles. It is established that micelles acquire a cylindrical shape at CTAB concentrations ranging from 0.2 to 0.25 M. Hydrodynamic radii and lengths of micelles are calculated.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071, Russia

    T. G. Movchan, I. V. Soboleva, E. V. Plotnikova & A. I. Rusanov

  2. St. Petersburg State University, Ul’yanovskaya ul. 1, Petrodvorets, St. Petersburg, 198504, Russia

    A. K. Shchekin & A. I. Rusanov

  3. Faculty of Physics, Moscow State University, Moscow, 119991, Russia

    I. V. Soboleva

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  1. T. G. Movchan
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  2. I. V. Soboleva
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  3. E. V. Plotnikova
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  4. A. K. Shchekin
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  5. A. I. Rusanov
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Original Russian Text © T.G. Movchan, I.V. Soboleva, E.V. Plotnikova, A.K. Shchekin, A.I. Rusanov, 2012, published in Kolloidnyi Zhurnal, 2012, Vol. 74, No. 2, pp. 257–265.

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Movchan, T.G., Soboleva, I.V., Plotnikova, E.V. et al. Dynamic light scattering study of cetyltrimethylammonium bromide aqueous solutions. Colloid J 74, 239–247 (2012). https://doi.org/10.1134/S1061933X1202007X

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  • DOI: https://doi.org/10.1134/S1061933X1202007X

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