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Wetting of Elastic Solids on Nanopillars

Abstract : Solids and liquids are both known to exhibit Cassie-Baxter states, where a drop or a solid nanoparticle is maintained on top of pillars due to wetting forces. We point out that due to elastic strain, solid nanocrystals exhibit a behavior different from that of liquids. First, the equilibrium Cassie-Baxter state on a single pillar exhibits a spontaneous symmetry breaking due to elastic effects. The second consequence of elasticity is the existence of stable partially impaled states, resulting from a compromise between wetting forces which favor impalement and elastic strain which resists impalement. Based on kinetic Monte Carlo simulations which include elastic strain, we discuss these effects and we propose a global phase diagram for the stability of nanocrystals on nanopillars.
Keywords : numbers: 68 55 -a 81 10 Aj
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Maxime Ignacio, Y. Saito, P. Smereka, Olivier Pierre-Louis. Wetting of Elastic Solids on Nanopillars. Physical Review Letters, American Physical Society, 2014, 112, pp.146102. ⟨10.1103/PhysRevLett.112.146102⟩. ⟨hal-02310819⟩

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