Spectral study on brilliant yellow in ctab micellar solutions.

Abstract

The micellization process in CTAB (cationic surfactant)-brilliant yellow (BY = anionic azo dye) aqueous solns. was studied by using Raman and UV-visible spectroscopy. The presence of KCl (insol. salt) induces formation of CTAB micelles which solubilize BY at concns. substantially below the normal CTAB cmc. The formation of these micelles causes BY to change from its acidic to its basic form. The BY acid-base equilibrium in aqueous solns. differs from that in the CTAB micelles. When the BY mols. are stabilized in the CTAB micelles, the apparent acid dissociation constant increases ~ 100 times compared to that in aqueous solns. and decreases as salt concentration increases.

Key words: CATIONIC SURTACTANTS, AQUEOUS SOLUTION, ANIONIC SURFACTANTS, ELECTROLYTE, MICELLAR SOLUTION, ACID-BASE EQUILIBRIUM, INTERFACE CHEMISTRY, BRILLIANT YELLOW, CRITICAL CONCENTRATION

CLC Number:

O657
O648

Cite this article

ZHANG YUNHONG;LIANG YINGQIU. Spectral study on brilliant yellow in ctab micellar solutions.[J]. Acta Chimica Sinica, 1993, 51(6): 586-593.

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(CTAB+BY)体系水溶液的光谱研究