TY - JOUR
T1 - Miscibility of alkanol and fluoroalkanol in Langmuir film at the air/water interface
AU - Takiue, Takanori
AU - Vollhardt, Dieter
N1 - Funding Information:
The authors are indebted to Dr S. Siegel for the help in performing GIXD measurements. We also thank Dr K. Kjaer and Dr G. Brezesinski for help with setting up the X-ray experiments. Financial assistance from the grant-in aid for Encouragement of Young Scientists of the Ministry of Education, Science, Sports and Culture of Japan (No. 10740326) is gratefully acknowledged.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
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.
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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 -