Micellization of hexa(oxyethylene) dodecyl ether (C12E6) was studied in water and in ethanol–water mixtures at different temperatures by gel filtration on Sphacryl S-200. Standard enthalpies and entropies of micellization were determined from variation of critical micelle concentration(cmc) with temperature. Compensation plots were obtained, slopes for alcohol–water mixtures being indentical with that for pure water. Therefore, the micelle formation in water and ethanol–water mixtures has been explained in terms of its bulk structure. Gel fitration of C12E6 micelle with addition of a large amount of ethanol has led to a finding that the micelle size gradually becomes small with increasing ethanol content until micelles disappear above 35%v/v.

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