Solubilization of Hydrophobic Dyes in Surfactant Solutions

Materials

Ali Reza Tehrani-Bagha¹ 

[1] Department of Chemical and Biological Engineering, Chalmers University of Technology, Göteborg SE-412 96, Sweden; E-Mail:

关键词: dye;    water insoluble;    hydrophobic;    surfactant;    solubilization;    micelle;   

DOI  :  10.3390/ma6020580

来源: mdpi

【 摘 要 】

In this paper, the use of surfactants for solubilization of hydrophobic organic dyes (mainly solvent and disperse dyes) has been reviewed. The effect of parameters such as the chemical structures of the surfactant and the dye, addition of salt and of polyelectrolytes, pH, and temperature on dye solubilization has been discussed. Surfactant self-assemble into micelles in aqueous solution and below the concentration where this occurs—the critical micelle concentration (CMC)—there is no solubilization. Above the CMC, the amount of solubilized dye increases linearly with the increase in surfactant concentration. It is demonstrated that different surfactants work best for different dyes. In general, nonionic surfactants have higher solubilization power than anionic and cationic surfactants. It is likely that the reason for the good performance of nonionic surfactants is that they allow dyes to be accommodated not only in the inner, hydrocarbon part of the micelle but also in the headgroup shell. It is demonstrated that the location of a dye in a surfactant micelle can be assessed from the absorption spectrum of the dye-containing micellar solution.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.