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Micellar association in simultaneous presence of organic salts/additives

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Journal of Surfactants and Detergents

Abstract

Viscosity measurements under Newtonian flow conditions had been performed on cetyltrimethylammonium bromide (CTAB) aqueous solutions in the combined presence of sodium salts of aromatic acids (sodium salicylate, NaSal; sodium benzoate, NaBen; sodium anthranilate, NaAn) and organic additives (1-hexanol, C6OH; n-hexylamine, C6NH2) at 30°C. On addition of C6OH or C6NH2, the viscosity of 25 mM CTAB solution remained nearly constant without salt as well as with a lower salt concentration. This is due to low CTAB concentration which is not sufficient to produce structural changes in this concentration range of salts. However, as the salt concentration was increased further, the effect of C6OH/C6NH2 addition was different with different salts: The viscosity first increased; then a decrease was observed with the former while with C6NH2 a decrease followed by constancy appeared in plots of relative viscosities (η r ) vs. organic additive concentrations. At further higher salt concentration, the magnitude of η r was much higher. The viscosity increase is explained in terms of micellar growth and the decrease in terms of swollen micelle formation (due to interior solubilization of organic additive) or micellar disintegration (due to formation of water + additive pseudophase).

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Authors and Affiliations

  1. Department of Chemistry, Aligarh Muslim University, 202 002, Aligarh, India

    Sanjeev Kumar, Ziya Ahmad Khan &  Kabir-ud-Din

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  1. Sanjeev Kumar
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  2. Ziya Ahmad Khan
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  3. Kabir-ud-Din
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Correspondence to Kabir-ud-Din.

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Kumar, S., Khan, Z.A. & Kabir-ud-Din Micellar association in simultaneous presence of organic salts/additives. J Surfact Deterg 5, 55–59 (2002). https://doi.org/10.1007/s11743-002-0205-1

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  • DOI: https://doi.org/10.1007/s11743-002-0205-1

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