Simulations of Dense Polymer Brushes : Zooming in the Mesoscale
Lundi 4 avril 2016 14:00
- Duree : 1 heure
Lieu : Conference room - LIPhy - Bât E - 140 Avenue de la Physique - St Martin d’Hères. Accès par interphone, appeler le secrétariat
Orateur : Sofia BIAGI (Dipartimento di Fisica, Sapienza-Universita di Roma, Italy / LIPhy)
Polymer brushes are versatile media : they are used to regulate adhesion properties of surfaces, for colloid stabilization, and since the recent discovery that the inner surface of various mammalian organs is coated by densely grafted macromolecules (the lumen of blood vessels, for example), the investigation is targeted also at biomedical applications.
By means of a coarse-graining method (Dissipative Particle Dynamics) we simulate the mesoscale dynamics of a flexible homodisperse polymer brush subdued to a simple liquid parabolic flow in slit pore geometry. We report that the system displays flow inversion at the brush interface and we associate such phenomenon to collective polymer dynamics : a wave propagating over the brush surface. Moreover, a striking similarity is observed between our passive polymer brush and active microswimmers (precisely, the Taylor’s swimmer).
Contact : chaouqi.misbah@univ-grenoble-alpes.fr
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