DE LA SUPPRESSION DE L’INSTABILITÉ DE RAYLEIGH-­‐PLATEAU À L’ANISOTROPIE STRUCTURALE DE NANOPARTICULES SOUS SÉCHAGE DIRECTIONNEL

Orateur : François BOULOGNE (Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA)

During this seminar, I will present first the flow of giant micelles on a vertical fiber. While Newtonian fluids undergo a Rayleigh-Plateau instability in this geometry, I will show that giant micelles develops under a shear flow, an elasticity balancing the effect of surface tension driving the instability. In a second part, I will report observations (from small angle neutron and X ray scattering techniques) on the liquid-solid transition in a colloidal suspensions of directionally dried nanoparticles. In particular, we have seen that during this transition, the material structure becomes anisotropic under the effect of the solvent flow. The measurement of this anisotropy, always seen in the solid material, must lead to a better understanding of the material mechanical properties.

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