Self-crumpling elastomers: bending induced by the drying stimulus of a nanoparticle suspension

Abstract : We report an experimental study of the drying-induced peeling of a bilayer, consisting of an elastomeric disk coated with a suspension of nanoparticles. We show that although capillary forces associated with the scale of the droplet can not compete with the adhesion of the elastomer on a surface, nevertheless large tensile stresses develop in the coating, which results in a moment bending the bilayer. We attribute this stress to the nano-menisci in the pores of the colloidal material and we propose a model that describes successfully the early stage curvature of the bilayer. Thus, we show that the peeling can be conveniently controlled by the particle size and the coating thickness.
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François Boulogne, Howard A. Stone. Self-crumpling elastomers: bending induced by the drying stimulus of a nanoparticle suspension. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2014, 108, pp.19001. ⟨10.1209/0295-5075/108/19001⟩. ⟨hal-01137544⟩

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