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Accueil > Séminaires > Archives > Archives 2011

Dynamics of the contact line in wetting and diffusing processes of water droplets on hydrogel substrates

Tadashi Kajya, Université Paris Diderot

par Salmon Jean-Baptiste - publié le

We studied the dynamics of the wetting and diffusing processes of water droplets on hydrogel (Poly (2-acrylamido-2-methyl-propane-sulfonic acid -co-acrylamide)(PAAM-PAMPS)) substrates. The profiles of the droplet and substrate were measured simultaneously using a grid projection method.

We observed that during the diffusion process of a water droplet, the contact line takes 2 different regimes : initially pinned then recede, and the transition of these 2 regimes is closely related to the local deformation of the gel surface close to the contact line. In this seminar, I’ll talk about the details of our experiment and also propose the possible mechanism of the present phenomena.