The influence of metal ions on the aggregation and hydrophobicity of dyes in solutions

K. W. Yeung, Songmin Shang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

43 Citations (Scopus)


The effect of the addition of metal ions to dye solutions in promoting dye aggregation and in changing dye association in solution has been studied. Experimental findings indicate that the promoting effects of calcium and magnesium ions are greater than that of sodium ions. It is expected that any change in dye hydrophobicity would have a direct influence on the extent of dye aggregation. Under acid conditions, a higher concentration of metal ions would result in an increase in dye aggregation with a reduction in dye hydrophobicity. On the other hand, while the dye aggregation is increased under alkaline conditions under the influence of metal ions, hydrophobicity was shown to increase. These changes in dye hydrophobicity could be used to explain the dyeing behaviour of reactive dyes in the dyeing of silk.
Original languageEnglish
Pages (from-to)228-232
Number of pages5
JournalJournal of the Society of Dyers and Colourists
Issue number7-8
Publication statusPublished - 1 Jul 1999

ASJC Scopus subject areas

  • Polymers and Plastics


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