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Models for describing dyeing equilibria
Author(s) -
Gerber H.
Publication year - 1994
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.1478-4408.1994.tb01601.x
Subject(s) - dyeing , adsorption , chemistry , diffusion , donnan potential , absorption (acoustics) , representation (politics) , thermodynamics , surface (topology) , volume (thermodynamics) , materials science , mathematics , organic chemistry , physics , electrolyte , composite material , geometry , electrode , politics , political science , law
The Gouy‐Chapman model of the way a dye is adsorbed from a dyebath is described and compared with the traditional Donnan approach of describing this phenomenon, in order to establish which is the more suitable for studying dyeing equilibria. It is shown that the two methods are substantilly the same in terms of their usefulness. In both models there are three values to be determined: standard affinity, internal volume and fixed charge in the case of the Donnan model, and standard affinity, accessible surface and surface charge density in the case of the Gouy‐Chapman model. The latter allows a very clear representation of absorption equilibria and diffusion behaviour of direct dyes on cellulosic substrates, and of acid dyes on nylon fibres.