Journal
DYES AND PIGMENTS
Volume 95, Issue 3, Pages 768-775Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2012.03.022
Keywords
Anionic dye; Cationic gemini surfactant; Dye-surfactant interaction; Dye-surfactant complexes; UV-Vis spectroscopy; Zeta potential
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In the present study, the interaction of an anionic azo dye, Sunset Yellow, with two cationic gemini surfactants with different spacer lengths (s = 3, 6 methylene groups) and their monomeric counterpart, dodecyl trimethyl ammonium bromide (DTAB), was investigated by surface tension, UV-Vis spectroscopy, and zeta potential measurements. The critical micelle concentration (CMC) was determined from plots of the surface tension (gamma) as a function of the logarithm of total surfactant concentration. Moreover, the values of binding constants (K-b) of dye-surfactant complexes were calculated by UV-Vis spectroscopy. The UV-Vis spectra showed that the dye surfactant interaction occurred in the solution at concentrations far below the CMC of each surfactant. The gemini surfactant with a shorter spacer showed stronger interaction with dye in comparison to DTAB and the gemini with longer spacer. The effect of surfactant chemical structure on solubilization of dye-surfactant aggregates at surfactant concentration above CMC was investigated by zeta potential. (C) 2012 Elsevier Ltd. All rights reserved.
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