Abstract
The miscibility of 1,1,2,2-tetrahydrohenicosafluorododecanol (TFC12OH) and 1-tetradecanol (C14OH) in Langmuir film at the air/water surface is studied by surface pressure π versus area per molecule A isotherms, Brewster angle microscopy (BAM), and grazing incidence X-ray diffraction (GIXD) performed at 298.15 K under atmospheric pressure. Plotting the transition pressure, which is given by a kink point on the π versus A isotherm, against composition X2, provides a two-dimensional phase diagram of this system. The diagram is of an eutectic type and therefore, the TFC12OH and C14OH molecules are practically immiscible in the condensed phase. The BAM images at mixed compositions are complicated but their composition dependency is understood in terms of the phase diagram. Furthermore, in the GIXD measurement at X2=0.5, two sharp peaks were observed on the in-plane intensity plot above the eutectic pressure. By comparing their peak positions to those of the pure component systems, it is concluded that one of the peaks originates from the pure TFC12OH condensed state and the other from the pure C14OH condensed state. This microscopic information strongly supports our macroscopic results obtained from the phase diagram.
| Original language | English |
|---|---|
| Pages (from-to) | 797-804 |
| Number of pages | 8 |
| Journal | Colloids and Surfaces A: Physicochemical and Engineering Aspects |
| Volume | 198-200 |
| DOIs | |
| Publication status | Published - Feb 18 2002 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Surfaces and Interfaces
- Physical and Theoretical Chemistry
- Colloid and Surface Chemistry
Cite this
Miscibility of alkanol and fluoroalkanol in Langmuir film at the air/water interface. / Takiue, Takanori; Vollhardt, Dieter.
In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 198-200, 18.02.2002, p. 797-804.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Miscibility of alkanol and fluoroalkanol in Langmuir film at the air/water interface
AU - Takiue, Takanori
AU - Vollhardt, Dieter
PY - 2002/2/18
Y1 - 2002/2/18
N2 - The miscibility of 1,1,2,2-tetrahydrohenicosafluorododecanol (TFC12OH) and 1-tetradecanol (C14OH) in Langmuir film at the air/water surface is studied by surface pressure π versus area per molecule A isotherms, Brewster angle microscopy (BAM), and grazing incidence X-ray diffraction (GIXD) performed at 298.15 K under atmospheric pressure. Plotting the transition pressure, which is given by a kink point on the π versus A isotherm, against composition X2, provides a two-dimensional phase diagram of this system. The diagram is of an eutectic type and therefore, the TFC12OH and C14OH molecules are practically immiscible in the condensed phase. The BAM images at mixed compositions are complicated but their composition dependency is understood in terms of the phase diagram. Furthermore, in the GIXD measurement at X2=0.5, two sharp peaks were observed on the in-plane intensity plot above the eutectic pressure. By comparing their peak positions to those of the pure component systems, it is concluded that one of the peaks originates from the pure TFC12OH condensed state and the other from the pure C14OH condensed state. This microscopic information strongly supports our macroscopic results obtained from the phase diagram.
AB - The miscibility of 1,1,2,2-tetrahydrohenicosafluorododecanol (TFC12OH) and 1-tetradecanol (C14OH) in Langmuir film at the air/water surface is studied by surface pressure π versus area per molecule A isotherms, Brewster angle microscopy (BAM), and grazing incidence X-ray diffraction (GIXD) performed at 298.15 K under atmospheric pressure. Plotting the transition pressure, which is given by a kink point on the π versus A isotherm, against composition X2, provides a two-dimensional phase diagram of this system. The diagram is of an eutectic type and therefore, the TFC12OH and C14OH molecules are practically immiscible in the condensed phase. The BAM images at mixed compositions are complicated but their composition dependency is understood in terms of the phase diagram. Furthermore, in the GIXD measurement at X2=0.5, two sharp peaks were observed on the in-plane intensity plot above the eutectic pressure. By comparing their peak positions to those of the pure component systems, it is concluded that one of the peaks originates from the pure TFC12OH condensed state and the other from the pure C14OH condensed state. This microscopic information strongly supports our macroscopic results obtained from the phase diagram.
UR - http://www.scopus.com/inward/record.url?scp=18344404576&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=18344404576&partnerID=8YFLogxK
U2 - 10.1016/S0927-7757(01)01003-2
DO - 10.1016/S0927-7757(01)01003-2
M3 - Article
AN - SCOPUS:18344404576
VL - 198-200
SP - 797
EP - 804
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
SN - 0927-7757
ER -