Abstract
The Miscibility of 1-icosanol (C20OH) and 1,1,2,2-tetrahydroheptadecafluorodecanol (FC10OH) in the adsorbed film at the hexane/water interface was studied by measuring the pressure dependence of interfacial tension at various compositions and analyzing the experimental results thermodynamically. The criterion of ideal mixing in the adsorbed film with respect to the volume of adsorption ΔwHv was constructed and used to examine the nonideal mixing of C20OH and FC10OH in the adsorbed film. It is found that the ΔwHv value deviates positively from the ideal mixing line, and therefore the mixing of C20OH and FC10OH molecules causes a larger increase in volume in the adsorbed film than in the bulk solution. Furthermore, the excess volume of adsorption vH,E was positive and its magnitude was comparable to that of the liquid alkane and perfluoroalkane mixture. This result is probably due to the increase in the occupied area of individual components at the interface. To gain a better understanding of the miscibility of C20OH and FC10OH in the adsorbed film, the phase diagram of adsorption (PDA) was constructed at various pressures. We found that these alcohol molecules become less miscible and therefore the activity coefficients of alcohols become larger in the expanded state with increasing pressure. This is in accord with the positive vH,E value. Furthermore the C20OH and FC10OH molecules were practically immiscible in the condensed state at high pressure.
| Original language | English |
|---|---|
| Pages (from-to) | 7096-7101 |
| Number of pages | 6 |
| Journal | Journal of Physical Chemistry B |
| Volume | 104 |
| Issue number | 30 |
| DOIs | |
| Publication status | Published - Aug 1 2000 |
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All Science Journal Classification (ASJC) codes
- Surfaces, Coatings and Films
- Physical and Theoretical Chemistry
- Materials Chemistry
Cite this
Thermodynamic study on phase transition in adsorbed film of fluoroalkanol at the hexane/water interface. 7. Pressure effect on the miscibility in the adsorbed film of alkanol and fluoroalkanol mixture. / Takiue, Takanori; Ikeda, Norihiro; Toyomasu, Takayuki; Matsubara, Hiroki; Aratono, Makoto.
In: Journal of Physical Chemistry B, Vol. 104, No. 30, 01.08.2000, p. 7096-7101.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Thermodynamic study on phase transition in adsorbed film of fluoroalkanol at the hexane/water interface. 7. Pressure effect on the miscibility in the adsorbed film of alkanol and fluoroalkanol mixture
AU - Takiue, Takanori
AU - Ikeda, Norihiro
AU - Toyomasu, Takayuki
AU - Matsubara, Hiroki
AU - Aratono, Makoto
PY - 2000/8/1
Y1 - 2000/8/1
N2 - The Miscibility of 1-icosanol (C20OH) and 1,1,2,2-tetrahydroheptadecafluorodecanol (FC10OH) in the adsorbed film at the hexane/water interface was studied by measuring the pressure dependence of interfacial tension at various compositions and analyzing the experimental results thermodynamically. The criterion of ideal mixing in the adsorbed film with respect to the volume of adsorption ΔwHv was constructed and used to examine the nonideal mixing of C20OH and FC10OH in the adsorbed film. It is found that the ΔwHv value deviates positively from the ideal mixing line, and therefore the mixing of C20OH and FC10OH molecules causes a larger increase in volume in the adsorbed film than in the bulk solution. Furthermore, the excess volume of adsorption vH,E was positive and its magnitude was comparable to that of the liquid alkane and perfluoroalkane mixture. This result is probably due to the increase in the occupied area of individual components at the interface. To gain a better understanding of the miscibility of C20OH and FC10OH in the adsorbed film, the phase diagram of adsorption (PDA) was constructed at various pressures. We found that these alcohol molecules become less miscible and therefore the activity coefficients of alcohols become larger in the expanded state with increasing pressure. This is in accord with the positive vH,E value. Furthermore the C20OH and FC10OH molecules were practically immiscible in the condensed state at high pressure.
AB - The Miscibility of 1-icosanol (C20OH) and 1,1,2,2-tetrahydroheptadecafluorodecanol (FC10OH) in the adsorbed film at the hexane/water interface was studied by measuring the pressure dependence of interfacial tension at various compositions and analyzing the experimental results thermodynamically. The criterion of ideal mixing in the adsorbed film with respect to the volume of adsorption ΔwHv was constructed and used to examine the nonideal mixing of C20OH and FC10OH in the adsorbed film. It is found that the ΔwHv value deviates positively from the ideal mixing line, and therefore the mixing of C20OH and FC10OH molecules causes a larger increase in volume in the adsorbed film than in the bulk solution. Furthermore, the excess volume of adsorption vH,E was positive and its magnitude was comparable to that of the liquid alkane and perfluoroalkane mixture. This result is probably due to the increase in the occupied area of individual components at the interface. To gain a better understanding of the miscibility of C20OH and FC10OH in the adsorbed film, the phase diagram of adsorption (PDA) was constructed at various pressures. We found that these alcohol molecules become less miscible and therefore the activity coefficients of alcohols become larger in the expanded state with increasing pressure. This is in accord with the positive vH,E value. Furthermore the C20OH and FC10OH molecules were practically immiscible in the condensed state at high pressure.
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U2 - 10.1021/jp993193p
DO - 10.1021/jp993193p
M3 - Article
AN - SCOPUS:0034238131
VL - 104
SP - 7096
EP - 7101
JO - Journal of Physical Chemistry B Materials
JF - Journal of Physical Chemistry B Materials
SN - 1520-6106
IS - 30
ER -