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Volumetric properties of sodium perfluoroalkylcarboxylates in aqueous solutions at different temperatures |
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| Authors: | Alfredo Gonz lez-P rez, Juan M. Ruso, Elena Blanco, Marí a J. Romero, Gerardo Prieto,F lix Sarmiento |
| Affiliation: | aGroup of Biophysics and Interfaces, Department of Applied Physics, Faculty of Physics, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain bDepartment of Inorganic Chemistry, Faculty of Chemistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain |
| Abstract: | Densities and sound velocities of sodium perfluorohexanoate and sodium perfluorononanoate for different concentrations above and below the critical micelle concentration (cmc) have been obtained at different temperatures. Apparent molar volumes and compressibilities of the surfactants in the monomeric and micellar form have been estimated. The relevant results were plotted as a function of the temperature and the alkyl chain length by using previous data reported for sodium heptanoate and sodium octanoate. The expected linear behaviour in function of temperature and also alkyl chain length have been found. In order to analyze the influence of the substitution of the hydrogen by fluorine in the alkyl chain of the surfactant, the data were compared with the hydrogenated counterpart. |
| Keywords: | Sodium perfluorohexanoate Sodium perfluorononanoate Apparent molar volumes Apparent molar compressibilities |
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