Sommaire:

Diffusiophoresis is an interfacially driven transport phenomenon, leading to the movement of macro-molecules under solute gradients. Physically this phenomenon results from osmotic driving forces located within a nanometric diffuse interface at the boundary of the particles.
It is an efficient but quite unexplored mean to drive and manipulate
particles. In this talk, I will present three different experiments
exploring the potentialities offered by this phenomenon. First, using a
generic microfluidic setup, we assess the displacement of silica
particles under a controlled salt gradient. Then we demonstrate that
spatial patterning of the particles can be achieved from temporal
oscillations of the solute concentration profile. Finally, we use this
energy transduction mechanism to device self-propelled particles, which
opens the possibility to explore the individual and collective motion of
driven particles in an intrinsically out-of-equilibrium situation.

Pour plus d'informations, merci de contacter Stocco A.