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Natural dye–surfactant interactions: thermodynamic and surface parameters
Author(s) -
Chandravanshi Shalini,
Upadhyay Santosh K
Publication year - 2012
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2012.00380.x
Subject(s) - pulmonary surfactant , ammonium bromide , chemistry , cationic polymerization , surface tension , aqueous solution , critical micelle concentration , bromide , micelle , ammonium , sodium , inorganic chemistry , organic chemistry , thermodynamics , biochemistry , physics
The interaction of two Indian natural dyes, namely madder ( Rubia cordifolia ) and mallow ( Punica granatum ), with cationic surfactant cetyl trimethyl ammonium bromide and anionic surfactant sodium lauryl sulphate, has been studied. Spectrophotometric data showed a strong interaction between the natural dyes and the surfactants. The critical micelle concentration of the surfactants, determined by measurement of specific conductance and surface tension, was found to decrease on the addition of natural dyes in an aqueous solution of surfactants. The thermodynamic and surface parameters for the interaction have been evaluated.