Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 184, Issue -, Pages 60-67Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2013.04.022
Keywords
Cetyltrimethylammonium bromide; Thermodynamic properties; Conductivity; Fluorescence; NMR
Funding
- Government of India through the Department of Science and Technology, New Delhi under Women Scientist Scheme A (WOS-A) [SR/WOS-A/CS-35/2009]
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The effect of organic additive, C-8-OH and C-9-OH (octan-1-ol and nonan-1-ol) on the micellar behavior of aqueous solution of cetyltrimethylammonium bromide, CTAB was examined by thermodynamic (density and speed of sound) measurements. The polar compounds form the additive-CTAB mixed micelles which cause micellar growth. The critical micelle concentration, cmc, and degree of counterion dissociation, alpha, of aqueous solution of CTAB containing different amounts of monohydric alcohols have been determined at various temperatures by means of electrical conductivity. Fluorescence method has also been used to obtain cmc values as well as the aggregation number, N-agg, of CTAB in the presence of studied alcohols. In general, the experimental results indicate that micelle formation is hindered by a rise in temperature. In addition, alcohols show an inhibitory effect on the formation of micelles of CTAB. The results are well supported by spectral studies viz, fluorescence and NMR. (C) 2013 Elsevier B.V. All rights reserved.
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