ILM, University Lyon 1, 43 Boulevard du 11 novembre 1918, 69622 Villeurbanne, France.
Department of Physics, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohma 223-8522, Japan.
Phys Rev Lett. 2014 Apr 11;112(14):146102. doi: 10.1103/PhysRevLett.112.146102. Epub 2014 Apr 9.
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.
固体和液体都表现出Cassie-Baxter 状态，在这种状态下，由于润湿力的作用，液滴或固体纳米颗粒会保持在支柱的顶部。我们指出，由于弹性应变，固体纳米晶体表现出与液体不同的行为。首先，由于弹性效应，单个支柱上的平衡 Cassie-Baxter 状态会自发地发生对称破缺。弹性的第二个后果是存在稳定的部分刺穿状态，这是由于润湿力有利于刺穿和弹性应变抵抗刺穿之间的妥协造成的。基于包括弹性应变的动力学蒙特卡罗模拟，我们讨论了这些效应，并提出了纳米晶体在纳米支柱上稳定性的全局相图。
