Solubilization of Dyes in Microemulsions

Klaus R. Wormuth, Linda A. Cadwell, Eric W. Kaler

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


By examination of the solubility of six dyes of increasing amphiphilicity in water-rich microemulsions incorporating oils of different polarity and surfactants with different charge, the important factors for optimizing dye solubility are revealed. In almost all cases, the solubility of dye is much enhanced in microemulsions over that in pure solvents. The primary variable is dye amphiphilicity: the more surfactant-like the dye becomes, the greater the solubility in water-rich microemulsions. The primary site for dye solubilization is the surfactant-rich interfacial region separating oil-rich and water-rich domains.

Original languageEnglish (US)
Pages (from-to)1035-1040
Number of pages6
Issue number6
StatePublished - 1990
Externally publishedYes


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