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7 papers · 2 filters
Can non-linear elasticity explain contact-line roughness at depinning?
Pierre Le Doussal, Kay Joerg Wiese, Elie Raphael +1
We examine whether cubic non-linearities, allowed by symmetry in the elastic energy of a contact line, may result in a different universality class at depinning. Standard linear el…
X-ray observation of micro-failures in granular piles approaching an avalanche
Alexandre Kabla, Georges Debregeas, Jean-Marc Di Meglio +1
An X-ray imaging technique is used to probe the stability of 3-dimensional granular packs in a slowly rotating drum. Well before the surface reaches the avalanche angle, we observe…
Sliding friction between an elastomer network and a grafted polymer layer: the role of cooperative effects
Thomas Vilmin, Elie Raphael
We study the friction between a flat solid surface where polymer chains have been end-grafted and a cross-linked elastomer at low sliding velocity. The contribution of isolated gra…
Damping of acoustic waves in dilute polymer solutions
Yoav Tsori, Pierre-Gilles de Gennes
The shear viscosity eta_s(w) of dilute polymer solutions (of flexible coils) has been classically measured and interpreted in terms of the Zimm modes. We point out that the longitu…
Interdigitation between surface-anchored polymer chains and an elastomer : consequences for adhesion promotion
Thomas Vilmin, Caroline Tadivat, Liliane Leger +2
We study the adhesion between a cross-linked elastomer and a flat solid surface where polymer chains have been end-grafted. To understand the adhesive feature of such a system, one…
Frustrated Rotations in Nematic Monolayers
Y. Tsori, P. -G. de Gennes
Tabe and Yokoyama found recently that the optical axis in a chiral monolayer of a ferronematic rotates when water evaporates from the bath: the chiral molecules act as propellers.…