Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 245, Issue 1-3, Pages 69-73Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2004.07.009
Keywords
CMC; micellar growth; cloud point; DLS; solubilization
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Micellar behavior of sodium dodecyl sulfate (NaDS) was examined in the presence of tetrabutylammonium bromide (TBABr) by surface tension, viscosity, dynamic light scattering (DLS), dye solubilization, and cloud point measurements. NaDS showed enhanced solubilization properties and a remarkable decrease in surface tension and critical micelle concentration (CMC) in presence of TBABr. Both viscosity and DLS showed growth in NaDS micelles (50 mM) above 100 mM TBABr concentration; sphere-to-rod transition and micellar growth observed till 200 mM. above which solution undergoes phase separation. The results are explained on the basis of the binding ability of bulky tetrabutylammonium ion on NaDS. (C) 2004 Elsevier B.V. All rights reserved.
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