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Titolo:
Thermodynamic study on phase transition in adsorbed film of fluoroalkanol at the hexane/water interface. 8. Phase transition and miscibility in the adsorbed film of fluoroalkanol mixture
Autore:
Takiue, T; Fukuta, TS; Matsubara, H; Ikeda, N; Aratono, M;
Indirizzi:
Kyushu Univ, Fac Sci, Dept Chem, Higashi Ku, Fukuoka 8128581, Japan KyushuUniv Fukuoka Japan 8128581 em, Higashi Ku, Fukuoka 8128581, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 4, volume: 105, anno: 2001,
pagine: 789 - 795
SICI:
1520-6106(20010201)105:4<789:TSOPTI>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADSORPTION; PRESSURE; MICELLE; ALKANOL; 1,1,2,2-TETRAHYDROHEPTADECAFLUORODECANOL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Takiue, T Kyushu Univ, Fac Sci, Dept Chem, Higashi Ku, Fukuoka 8128581, Japan Kyushu Univ Fukuoka Japan 8128581 i Ku, Fukuoka 8128581, Japan
Citazione:
T. Takiue et al., "Thermodynamic study on phase transition in adsorbed film of fluoroalkanol at the hexane/water interface. 8. Phase transition and miscibility in the adsorbed film of fluoroalkanol mixture", J PHYS CH B, 105(4), 2001, pp. 789-795

Abstract

The interfacial tension gamma of the hexane solution of a mixture of 1,1,2,2-tetrahydroheptadecafluorodecanol (FC10OH) and 1,1,2,2,-tetrahydrohenicosafluorododecanol (FC12OH) against water was measured as a function of the total molality m and composition of FC12OH X-2 at 298.15 K under atmosphericpressure. The gamma vs m curve has one or two distinct break points depending on X2 By plotting the gamma and m values at the break points and drawing the interfacial pressure Jr vs mean area per adsorbed molecule A curves, it was suggested that the triple point of adsorbed film, at which the threekinds of states (gaseous, expanded, and condensed states) coexist simultaneously, exists at a middle composition. The phase diagrams of adsorption (PDA) were constructed and the excess Gibbs energy of adsorption g(H,E) was calculated to examine the miscibility of FC10OH and FC12OH molecules in the adsorbed film. It was found that these alcohols mix almost ideally both in the gaseous and expanded states and nonideally in the condensed state. Furthermore, the mixing of FC10OH and FC12OH in the condensed film was accompanied by a positive g(H,E) value. This suggests that the difference in the magnitude of mutual interaction between the same species affects appreciably the miscibility of molecules in the condensed state where the adsorbed molecules are assumed to be closely packed and arranged regularly.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 11:55:18