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The Measurement of Donnan Potentials with Dyed Cellulose and Aqueous Salt Solutions
Author(s) -
Neale S. M.,
Saha P. K.
Publication year - 1957
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.1478-4408.1957.tb02209.x
Subject(s) - cellophane , donnan potential , aqueous solution , salt (chemistry) , chemistry , ion , adsorption , alkali metal , salt solution , electric potential , inorganic chemistry , cellulose , chemical physics , organic chemistry , electrode , electrolyte , physics , quantum mechanics , voltage
Measurements have been made of the electrical potential difference (Donnan potential) between dyed Cellophane and aqueous solutions of alkali‐metal chlorides. The presence of adsorbed coloured ions of negative electric charge increases the negative potential of cellulose, whereas positively charged coloured ions may reverse the sign of the charge. The measured potentials, whilst smaller than those predicted by the application of the Donnan theory, after making the usual simplifying assumptions, are in good general agreement with modern views of the mechanism of direct dyeing.