Miscibility of alkanol and fluoroalkanol in Langmuir film at the air/water interface

Takanori Takiue, Dieter Vollhardt

Research output: Contribution to journalArticle

27 Citations (Scopus)

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 languageEnglish
Pages (from-to)797-804
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume198-200
DOIs
Publication statusPublished - Feb 18 2002

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Langmuir Blodgett films
Phase diagrams
Brewster angle
solubility
Solubility
phase diagrams
grazing incidence
eutectics
Eutectics
Isotherms
Water
air
Microscopic examination
isotherms
Air
Chemical analysis
water
microscopy
X ray diffraction
Molecules

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 journalArticle

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