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Effect of pressure and temperature on adiabatic compressibility of aqueous solutions of amphiphiles with a perfluorocarbon chain

Fukada, Kazuhiro ; Kobayashi, Yukihiro ; Ota, Yoko ; Fujii, Masatoshi ; Kato, Tadashi ; Seimiya, Tsutomu

Thermochimica acta, 2000-07, Vol.352, p.189-197 [Periódico revisado por pares]

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Título:
Effect of pressure and temperature on adiabatic compressibility of aqueous solutions of amphiphiles with a perfluorocarbon chain
Autor: Fukada, Kazuhiro ; Kobayashi, Yukihiro ; Ota, Yoko ; Fujii, Masatoshi ; Kato, Tadashi ; Seimiya, Tsutomu
Assuntos: Density ; Electrostriction ; Fluorinated surfactant ; Hydrophobic hydration ; Sound velocity
É parte de: Thermochimica acta, 2000-07, Vol.352, p.189-197
Descrição: The apparent adiabatic compressibility and the apparent molar volume of sodium perfluoroheptanoate (C 6F 13COONa) were obtained from the experimental data of ultrasound velocity and density of its aqueous solutions at the concentration above and below CMC (critical micelle concentration) as functions of applied pressure (0–70 MPa) and temperature (5–35°C). Those were compared to the reported data for sodium decanoate (C 9H 19COONa) of Vikingstad et al. [J. Colloid Interface Sci. 72 (1979) 59]. It was found that the micelles of C 6F 13COONa were more easily compressible than C 9H 19COONa micelles under the condition studied. For the singly dispersed state below CMC, negative apparent compressibility of C 6F 13COONa was confirmed and it approached to zero with the increase of pressure or temperature suggesting the decreased electrostriction and hydrophobic hydration with pressure or temperature rise.
Editor: Elsevier B.V
Idioma: Inglês

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