Volume 53, Number 1, January 2001
|Page(s)||100 - 106|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 December 2003|
A fluid floating bilayer
Institut Laue-Langevin - B.P. 156, F-38042 Grenoble Cedex,
2 INFM - Genova, Italy
3 Institut Charles Sadron (CNRS-UPR 22.) - 6 rue Boussingault, F-67083 Strasbourg Cedex, France
4 Spectrométrie Physique (CNRS-UMR 5588, Université Grenoble I.) - B.P. 87, F-38402 St Martin d'Hères Cedex, France
5 Bergische Universität Wuppertal, Fachbereich Physik - D-42097 Wuppertal, Germany
6 DRFMC/SP2M/SGX CEA - 17 Avenue des Martyrs, F-38054 Grenoble, France
Corresponding author: firstname.lastname@example.org
Accepted: 20 October 2000
A highly hydrated lipid bilayer, floating a few Åabove another one adsorbed on a smooth solid substrate, was prepared at room temperature where lipids (DSPC) are in gel phase, then heated at several temperatures including the pretransitional temperature and the chain melting temperature . A precise in situ characterization by neutron reflectivity led to two new results. First, even when in fluid phase the floating bilayer was structured and stable; it thus provides a flexible model system for physical and biophysical studies of membranes. Second, at intermediate temperatures, a spectacular maximum in both inter-bilayer distance and bilayer roughness was simultaneously observed. It might be a direct observation of the balance between energy minimization and entropic repulsion, leading to an estimation of the dimensionless parameter , where A is the Hamacker constant and κ the bending modulus.
PACS: 87.16.Dg – Membranes, bilayers and vesicles / 87.15.Ya – Fluctuations / 61.12.Ha – Neutron reflectometry
© EDP Sciences, 2001
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