Thermodynamic study on phase transition in adsorbed film of fluoroalkanol at the hexane/water interface. 4. Phase transition in the adsorbed film of the alkanol and fluoroalkanol mixture

Takanori Takiue, Takehiko Matsuo, Norihiro Ikeda, Kinsi Motomura, Makoto Aratono

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28 Citations (Scopus)

Abstract

The interfacial tension, γ, of the hexane solution of the 1-icosanol (C20OH) and 1,1,2,2-tetrahydroheptadecafluorodecanol (FC10OH) mixture against water was measured as a function of total molality m and composition of FC10OH, X2, at 298.15 K under atmospheric pressure. All the γ vs m curves have a break point (first break) that corresponds to the phase transition from the expanded to the condensed state. Furthermore, it was found that the curves at X2 = 0.275 and 0.280 show another break (second break) at a high concentration. By calculating the interfacial density ΓH and then drawing the interfacial pressure, π, vs area per adsorbed molecule, A, curves, it was suggested that the first-order phase transition takes place from the expanded to the condensed film of C20OH at X2 < 0.250 and to that of FC10OH at X2 > 0.300 at the first break point. Furthermore the second break point was suggested to correspond to the first-order phase transition from the FC10OH condensed film to the C20OH condensed film. These findings were confirmed by the interfacial densities of individual components and support that C20OH and FC10OH molecules are completely immiscible in the condensed film, although they are miscible with each other at all proportions in the expanded film. Furthermore, it is shown that the phase transition from the C20OH to the FC10OH condensed state does not take place at the second break point because the cross-sectional area of the fluorocarbon chain is larger than that of the hydrocarbon chain and the condensed film is constructed of individual alcohol molecules.

Original languageEnglish
Pages (from-to)4906-4911
Number of pages6
JournalJournal of Physical Chemistry B
Volume102
Issue number25
Publication statusPublished - Jun 18 1998

Fingerprint

Phase Transition
Hexanes
Hexane
Thermodynamics
Phase transitions
thermodynamics
Water
water
Fluorocarbons
Molecules
Atmospheric Pressure
Surface Tension
curves
Hydrocarbons
molecules
fluorocarbons
Alcohols
Pressure
Atmospheric pressure
Surface tension

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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title = "Thermodynamic study on phase transition in adsorbed film of fluoroalkanol at the hexane/water interface. 4. Phase transition in the adsorbed film of the alkanol and fluoroalkanol mixture",
abstract = "The interfacial tension, γ, of the hexane solution of the 1-icosanol (C20OH) and 1,1,2,2-tetrahydroheptadecafluorodecanol (FC10OH) mixture against water was measured as a function of total molality m and composition of FC10OH, X2, at 298.15 K under atmospheric pressure. All the γ vs m curves have a break point (first break) that corresponds to the phase transition from the expanded to the condensed state. Furthermore, it was found that the curves at X2 = 0.275 and 0.280 show another break (second break) at a high concentration. By calculating the interfacial density ΓH and then drawing the interfacial pressure, π, vs area per adsorbed molecule, A, curves, it was suggested that the first-order phase transition takes place from the expanded to the condensed film of C20OH at X2 < 0.250 and to that of FC10OH at X2 > 0.300 at the first break point. Furthermore the second break point was suggested to correspond to the first-order phase transition from the FC10OH condensed film to the C20OH condensed film. These findings were confirmed by the interfacial densities of individual components and support that C20OH and FC10OH molecules are completely immiscible in the condensed film, although they are miscible with each other at all proportions in the expanded film. Furthermore, it is shown that the phase transition from the C20OH to the FC10OH condensed state does not take place at the second break point because the cross-sectional area of the fluorocarbon chain is larger than that of the hydrocarbon chain and the condensed film is constructed of individual alcohol molecules.",
author = "Takanori Takiue and Takehiko Matsuo and Norihiro Ikeda and Kinsi Motomura and Makoto Aratono",
year = "1998",
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T1 - Thermodynamic study on phase transition in adsorbed film of fluoroalkanol at the hexane/water interface. 4. Phase transition in the adsorbed film of the alkanol and fluoroalkanol mixture

AU - Takiue, Takanori

AU - Matsuo, Takehiko

AU - Ikeda, Norihiro

AU - Motomura, Kinsi

AU - Aratono, Makoto

PY - 1998/6/18

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