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Microrhéomètre sur puce pour l'étude de l'écoulement d'un liquide proche d'une surface liquide

Abstract : This thesis focuses on the study of the rheological behavior of confined fluids. For this purpose, the microcantilever of an atomic force microscope (AFM) is used to probe the rheological properties of a fluid confined between two surfaces, the surface of a sphere glued to the free-end of the AFM microcantilever and a flat solid surface on which the fluid is deposited. The set-up consists of an AFM, an electrical system for the deflection measurement and a piezoelectric device to move the solid surface (approach, oscillation, etc.). An analytical model allows to determine the rheological properties of the confined fluid from the measurement of the microcantilever deflection due to the hydrodynamic force exerted by the fluid on the sphere. This method has been validated for Newtonian fluids. For non-Newtonian fluids, such as polyacrylamide solution, we found that the viscosity depends on the distance D between the sphere and the plane surface and the shear rate is not the only relevant parameter for interpreting the rheological properties.
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Contributor : Ahmad Darwiche <>
Submitted on : Tuesday, October 9, 2012 - 11:06:06 AM
Last modification on : Thursday, January 11, 2018 - 6:21:07 AM
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  • HAL Id : tel-00738427, version 1


Ahmad Darwiche. Microrhéomètre sur puce pour l'étude de l'écoulement d'un liquide proche d'une surface liquide. Micro et nanotechnologies/Microélectronique. Université Sciences et Technologies - Bordeaux I, 2012. Français. ⟨NNT : 2012BOR14570⟩. ⟨tel-00738427⟩



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