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Surface Tension of Ionised Dye Solutions
Author(s) -
GILES C. H.,
SOUTAR A. H.
Publication year - 1971
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1971.tb03029.x
Subject(s) - cationic polymerization , surface tension , adsorption , chemistry , sodium , chloride , chemical engineering , polymer chemistry , organic chemistry , thermodynamics , physics , engineering
Surface‐tension (γ) values of solutions of several anionic and cationic dyes in water have been measured by the ring method over a range of concentrations. All of these dyes reduce the surface tension of water, i.e. they are surface‐active, the most effective being monosulphonated and cationic dyes. Polysulphonated dyes are less effective, but even a tetrasulphonated naphthaleneazonaphthalene dye reduces γ noticeably. Addition of sodium chloride causes a further reduction of γ with a polysulphonated dye. The results suggest that all ionised dyes are surface‐active, and thus will tend to concentrate at a water interface. This may partly explain their adsorption by fibres.