One and a half layers? Mixed Langmuir monolayer of 10,12-pentacosadiynoic acid and a semifluorinated tetracosane

Shaopeng Wang, Richard Lunn, Marie Pierre Krafft, Roger Leblanc

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

The different mixed Langmuir monolayers of 10,12-pentacosadiynoic acid (PDA) and semifluorinated tetracosane (CF3(CF2)7(CH2)15CH3, as F8H16 below) were studied by surface pressure-area isotherm, UV-Vis spectroscopy, and Brewster angle microscopy (BAM). The surface pressure-area isotherms of the mixed PDA/F8H16 monolayers show reduced limiting molecular areas, which indicate miscible films with strong interactions. A minimum limiting area was found for the monolayer of PDA/F8H16 mixed at 1:2 molar ratio. The UV-Vis spectra show that the PDA in the mixtures can be polymerized upon UV irradiation up to the molar ratio of 1:2 (PDA/F8H16). The BAM images of the mixtures show that at higher ratio of F8H16 the condensed domains of PDA disappear. The above evidence suggests that the fluorinated moiety of F8H16 may stay on top of PDA to form an extra half layer at high surface pressures.

Original languageEnglish
Pages (from-to)2882-2886
Number of pages5
JournalLangmuir
Volume16
Issue number6
DOIs
StatePublished - Mar 21 2000

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monomolecular films
Monolayers
acids
Acids
Brewster angle
Isotherms
Microscopic examination
isotherms
microscopy
Ultraviolet spectroscopy
guy wires
12-pentacosadiynoic acid 10
tetracosane
Irradiation
irradiation
spectroscopy

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

One and a half layers? Mixed Langmuir monolayer of 10,12-pentacosadiynoic acid and a semifluorinated tetracosane. / Wang, Shaopeng; Lunn, Richard; Krafft, Marie Pierre; Leblanc, Roger.

In: Langmuir, Vol. 16, No. 6, 21.03.2000, p. 2882-2886.

Research output: Contribution to journalArticle

Wang, Shaopeng ; Lunn, Richard ; Krafft, Marie Pierre ; Leblanc, Roger. / One and a half layers? Mixed Langmuir monolayer of 10,12-pentacosadiynoic acid and a semifluorinated tetracosane. In: Langmuir. 2000 ; Vol. 16, No. 6. pp. 2882-2886.
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