Supported bilayers: Combined specular and diffuse X-ray scattering |
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Authors: | L Malaquin T Charitat and J Daillant |
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Institution: | (1) Division of Cell Biology, Institute of Anatomy, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland;(2) Present address: Institute of Medical Microbiology, University of Zurich, Gloriastrasse 32, CH-8006 Zurich, Switzerland; |
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Abstract: | A method is proposed for the analysis of specular and off-specular reflectivity from supported lipid bilayers. Both thermal
fluctuations and the “static” roughness induced by the substrate are carefully taken into account. Examples from supported
bilayers and more complex systems comprising a bilayer adsorbed or grafted on the substrate and another “floating” bilayer
are given. The combined analysis of specular and off-specular reflectivity allows the precise determination of the structure
of adsorbed and floating bilayers, their tension, bending rigidity and interaction potentials. We show that this new method
gives a unique opportunity to investigate phenomena like protrusion modes of adsorbed bilayers and opens the way to the investigation
of more complex systems including different kinds of lipids, cholesterol or peptides. |
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