Les forces de surface dynamiques pour l'investigation mécanique des surfaces molles

Abstract : This work addresses how the measurement of hydrodynamic forces of a liquid confined between a sphere and a surface of interest can lead to probe at a distance and without contact her mechanical properties. Firstly, we introduce this original technique of fluid probe and the dynamic Surface Force Apparatus used to perform these nanorheology experiments. Then, we present two applications for which the fluid probe can be of great importance. The first application is the study of friction properties of lipid bilayers. More particularly we measure very weak fluid friction coefficients on some fluid bilayers, which can be an important issue for bio-lubrication. The second application is the study of elastic properties of thin elastomer layers. For that we first develop an elasto-hydrodynamic theory for sphere-plan configuration in dynamic mode. Then, we present experimental results in very good agreement with this theory. We are able to measure the Young modulus of thin PDMS films of thickness as small as 600~nm. Finally, we present instrumental developments performed on the Surface Force Apparatus to optimize its potential as fluid probe.
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Physics. Université Claude Bernard - Lyon I, 2010. French


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Submitted on : Friday, July 22, 2011 - 12:29:00 PM
Last modification on : Friday, July 22, 2011 - 1:15:07 PM

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Samuel Leroy. Les forces de surface dynamiques pour l'investigation mécanique des surfaces molles. Physics. Université Claude Bernard - Lyon I, 2010. French. <tel-00610528>

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