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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2005

Structure and fluctuations of a single floating lipid bilayer

Résumé

A single lipid molecular bilayer of 17 or 18 carbon chain phosphocholines, floating in water near a flat wall, is prepared in the bilayer gel phase and then heated to the fluid phase. Its structure (electron density profile) and height fluctuations are determined by using x-ray reflectivity and nonspecular scattering. By fitting the off-specular signal to that calculated for a two-dimensional membrane using a Helfrich Hamiltonian, we determine the three main physical quantities that govern the bilayer height fluctuations: The wall attraction potential is unexpectedly low; the surface tension, roughly independent on chain length and temperature, is moderate (≈5 × 10–4 J·m–2) but large enough to dominate the intermediate range of the fluctuation spectrum; and the bending modulus abruptly decreases by an order-of-magnitude from 10–18 J to 10–19 J at the bilayer gel-to-fluid transition.

Dates et versions

hal-02301229 , version 1 (30-09-2019)

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Citer

J. Daillant, E. Bellet-Amalric, A. Braslau, Thierry Charitat, G. Fragneto, et al.. Structure and fluctuations of a single floating lipid bilayer. Proceedings of the National Academy of Sciences of the United States of America, 2005, 102 (33), pp.11639-11644. ⟨10.1073/pnas.0504588102⟩. ⟨hal-02301229⟩
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