Binary icosahedral quasicrystals of hard spheres in spherical confinement

Abstract

The influence of geometry on the local and global packing of particles is important to many fundamental and applied research themes such as the structure and stability of liquids, crystals and glasses. Here, we show by experiments and simulations that a binary mixture of hard-sphere-like particles crystallizing into the MgZn2 Laves phase in bulk, spontaneously forms 3D icosahedral quasicrystals in slowly drying droplets. Moreover, the local symmetry of 70-80% of the particles changes to that of the MgCu2 Laves phase. Both of these findings are significant for photonic applications. If the stoichiometry deviates from that of the Laves phase, our experiments show that the crystallization of MgZn2 is hardly affected by the spherical confinement. Our simulations show that the quasicrystals nucleate away from the spherical boundary and grow along five-fold symmetric structures. Our findings not only open the way for particle-level studies of nucleation and growth of 3D quasicrystals, but also of binary crystallization.

arXiv comment35 pages, 18 figures

References in corpus (3)

• Accurate determination of crystal structures based on averaged local bond order parameters
• Strong scaling of general-purpose molecular dynamics simulations on GPUs
• Free Energy Landscape of Colloidal Clusters in Spherical Confinement

Cited by in corpus (6)

• Colloidal Hard Spheres: Triumphs, Challenges and Mysteries
• Crystallization of Binary Nanocrystal Superlattices and the Relevance of Short-Range Attraction
• Connecting packing efficiency of binary hard sphere systems to their intermediate range structure
• Exact anisotropic properties of hard spheres in narrow cylindrical confinement
• Entropic Trapping of Hard Spheres in Spherical Confinement
• Self-assembly of Colloids with Competing Interactions Confined in Spheres