Abstract
Both the critical solution temperature (CST, or the Krafft temperature) and the critical solution pressure (CSP, or the Tanaka pressure) were determined for sodium perfluorodecanoate (NaPFDe) in water, and the result shows that the Krafft temperature is raised with the increase in the Tanaka pressure. A thermodynamic analysis has been made on the data for the critical micellization concentration (cmc) and of the solubility at various temperatures and pressures. The estimated change in the partial molal volume, resulting from micelle formation from the singly dispersed state and from the hydrated solid state, was found to be conspicuously higher for NaPFDe compared to hydrocarbon surfactants. This has been ascribed to the more pronounced role of carbon chain-water interactions and water structure effects of the fluorocarbon surfactants.
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Ikawa, Y., Tsuru, S., Murata, Y. et al. A pressure and temperature study on solubility and micelle formation of sodium perfluorodecanoate in aqueous solution. J Solution Chem 17, 125–137 (1988). https://doi.org/10.1007/BF00646432
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DOI: https://doi.org/10.1007/BF00646432