Dynamic Light Scattering Study of Cetyltrimethylammonium Bromide Aqueous Solutions

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

Research output

29 Citations (Scopus)

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 indic
Original languageEnglish
Pages (from-to)239-247
JournalColloid Journal
Volume74
Issue number2
DOIs
Publication statusPublished - 2012

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