Fluorinated Langmuir monolayers are more viscous than non-fluorinated monolayers

Daiki Murakami, U. Langer, Z. Khattari, Th M. Fischer

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The surface shear viscosity of the liquid expanded phase in Langmuir monolayers of fluorinated alcohols differs by orders of magnitude from the corresponding surface shear viscosity of Langmuir monolayers of their non-fluorinated counterparts. The line tension between the liquid expanded and the gaseous phase on the other hand is of similar magnitude for both fluorinated and non-fluorinated surfactants. The difference of fluorinated versus non-fluorinated monolayers is measured by active microrheology and by observing the shape relaxation of distorted liquid expanded domains toward a circular shape. Our microrheology measurements are supported by measurements of the relaxation rates of distortions, which in fluorinated liquid expanded phases are proportional to the deviation of the curvature from the mean curvature, whereas they are proportional to the square of the deviation of the curvature from the mean curvature in non-fluorinated monolayers.

Original languageEnglish
Pages (from-to)5376-5379
Number of pages4
JournalJournal of Physical Chemistry B
Volume114
Issue number16
DOIs
Publication statusPublished - Apr 29 2010

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monomolecular films
Viscosity
Monolayers
curvature
Shear viscosity
Liquids
Surface-Active Agents
liquid phases
Alcohols
viscosity
shear
deviation
liquids
alcohols
Surface active agents
surfactants

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Fluorinated Langmuir monolayers are more viscous than non-fluorinated monolayers. / Murakami, Daiki; Langer, U.; Khattari, Z.; Fischer, Th M.

In: Journal of Physical Chemistry B, Vol. 114, No. 16, 29.04.2010, p. 5376-5379.

Research output: Contribution to journalArticle

Murakami, Daiki ; Langer, U. ; Khattari, Z. ; Fischer, Th M. / Fluorinated Langmuir monolayers are more viscous than non-fluorinated monolayers. In: Journal of Physical Chemistry B. 2010 ; Vol. 114, No. 16. pp. 5376-5379.
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