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Transport of Acid Dye in Nylon Film
Author(s) -
Sada E,
Kumazawa H,
Ando T
Publication year - 1985
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.1478-4408.1985.tb01008.x
Subject(s) - nernst equation , adsorption , diffusion , permeation , dyeing , acid dye , chemistry , langmuir , steady state (chemistry) , analytical chemistry (journal) , chemical engineering , thermodynamics , polymer chemistry , chromatography , membrane , organic chemistry , biochemistry , physics , electrode , engineering
The results of both steady‐state permeation and non‐steady‐state dyeing experiments over a wide range of dye concentrations for a system consisting of an acid dye (C.I. Acid Blue 182) and a nylon 6 film were analysed on the basis of surface diffusion with simultaneous multimodal adsorption. The concentration dependence of the diffusion coefficient of the dye in the nylon film can be explained by surface diffusion incorporating one Nernst‐type and two Langmuir‐type adsorption mechanisms except when high concentrations of dye are applied. The concentration dependence of the diffusion coefficient taken from the permeation experiments in the high concentration region is predicted by a surface diffusion mechanism in which two true adsorption equilibria of the Langmuir type are established throughout the nylon, whereas only a pseudo‐equilibrium adsorption of the Nernst type is achieved.