Melting and solid-solid transitions of two-dimensional crystals composed of Janus spheres.,Soft Matter

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Melting and solid-solid transitions of two-dimensional crystals composed of Janus spheres.
Soft Matter ( IF 2.9 ) Pub Date : 2020-03-04 , DOI: 10.1039/d0sm00023j
Tao Huang ₁ , Yilong Han , Yong Chen

Affiliation

Colloidal model systems have been extensively used in the studies of various phase transitions, but melting and solid-solid transitions have rarely been explored in monolayer colloidal crystals with anisotropic attractions. Patchy colloidal particles have served as important model systems of atoms and molecules with anisotropic interactions. In this work, we study the melting and solid-solid transitions of two-dimensional crystals composed of Janus colloidal spheres using Langevin dynamics simulation. We discovered a first-order solid-solid transition from a single crystal with uniform stripes to a novel crystal with polycrystalline domains of stripes. The centers of masses of the particles maintain the morphology of a single crystal with long-range translational and bond-orientational orders, but particle orientations form polycrystalline domains of stripes. The stripe domains form by a strain-induced nucleation process via the collective rotation of particles. In addition to this solid-solid transition, the melting transition at a higher temperature follows a two-step Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) scenario, similar to most isotropic particle systems.

中文翻译：

由Janus球组成的二维晶体的熔融和固-固转变。

胶体模型系统已广泛用于各种相变的研究，但很少在具有各向异性引力的单层胶体晶体中探索熔融和固-固转变。斑片状的胶体颗粒已成为具有各向异性相互作用的原子和分子的重要模型系统。在这项工作中，我们使用Langevin动力学模拟研究了由Janus胶体球组成的二维晶体的熔化和固-固转变。我们发现了从具有均匀条纹的单晶到具有条纹多晶域的新型晶体的一阶固-固过渡。粒子的质心保持了具有长距离平移和键向排列顺序的单晶的形态，但粒子方向形成条纹的多晶域。条带域是通过应变诱导的成核过程通过粒子的集体旋转而形成的。除了这种固-固过渡，在高温下的熔融过渡遵循两步式的Kosterlitz-Thouless-Halperin-Nelson-Young（KTHNY）方案，类似于大多数各向同性的粒子系统。

更新日期：2020-03-26

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