Abstract
Volumes and heat capacities of transfer were used to study the effect of various additives on micellization. The reference surfactant in this study was sodium octanoate and the other components were NaCl, sodium formate, sodium acetate, sodium perfluoroacetate, n-butoxyethanol, sodium decanoate, and sodium perfluorooctanoate. The heat capacities and volumes were measured with a flow microcalorimeter and a flow densimeter. In the case of NaCl and n-butoxyethanol the converse transfer functions were measured, i.e., the transfer of sodium octanoate from water to the binary solution. This work shows that the simple electrolytes enhance the micellization by salting out the monomers, n-butoxyethanol comicellizes with the surfactant and so does sodium decanoate. With perfluorooctanoate two different types of mixed micelles seem to coexist: one rich in hydrosurfactant and one in perfluorosurfactant.
Published Version
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