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Stripes of partially fluorinated alkyl chains: Dipolar Langmuir monolayers Matthias F. Schneidera
 

Summary: Stripes of partially fluorinated alkyl chains: Dipolar Langmuir monolayers
Matthias F. Schneidera
Lehrstuhl für Biophysik, Technische Universität München, 85748 Garching, Germany
David Andelman
Lehrstuhl für Biophysik, Technische Universität München, 85748 Garching, Germany and School of Physics
and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University,
Ramat Aviv 69978 Tel Aviv, Israel
Motomu Tanakab
Lehrstuhl für Biophysik, Technische Universität München, 85748 Garching, Germany
Received 7 April 2004; accepted 16 December 2004; published online 2 March 2005
Stripelike domains of Langmuir monolayers formed by surfactants with partially fluorinated lipid
anchors F-alkyl lipids are observed at the gas-liquid phase coexistence. The average periodicity of
the stripes, measured by fluorescence microscopy, is in the micrometer range, varying between 2 and
8 m. The observed stripelike patterns are stabilized due to dipole-dipole interactions between
terminal­ CF3 groups. These interactions are particularly strong as compared with nonfluorinated
lipids due to the low dielectric constant of the surrounding media air . These long-range dipolar
interactions tend to elongate the domains, in contrast to the line tension that tends to minimize the
length of the domain boundary. This behavior should be compared with that of the lipid monolayer
having alkyl chains, and which form spherical microdomains bubbles at the gas-liquid
coexistence. The measured stripe periodicity agrees quantitatively with a theoretical model.

  

Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University

 

Collections: Materials Science; Physics