Abstract
Abstract The solubilization behavior of mixed micelles of nonionic and anionic surfactants toward a water-insoluble dye, Yellow OB, has been studied. The surfactants examined were a nonionic surfactant, dodecyl polyoxyethylene ether (C12POE), and anionic surfactants with the chemical structure of (Remark: Graphics omitted.), where m+n=8 and where m or n is 0, 4, or 8 (and sodium decyl sulfonate for reference). The solubilization greatly depends on the position of the benzene ring in the hydrocarbon chain of the anionic surfactant mixed; in the mixture of C12POE and (Remark: Graphics omitted.), the synergistic effect in solubilization is remarkable. The results have been discussed in relation to the structure or compactness of the polyoxyethylene shell of the mixed micelle, and in relation to the interaction of anionic and nonionic surfactants in their mixed micelle, which had previously been observed by NMR measurements.
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