Letter

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

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Published 7 October 2014 Copyright © EPLA, 2014
, , Citation F. Boulogne and H. A. Stone 2014 EPL 108 19001 DOI 10.1209/0295-5075/108/19001

0295-5075/108/1/19001

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 cannot compete with the adhesion of the elastomer on a surface, 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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10.1209/0295-5075/108/19001