Binbin Luo1 Qian Chen1

1, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States

We observe the crystallization of a colloidal Kossel supracrystal from anisotropic nanoparticles using liquid-phase transmission electron microscopy. By tracking the nanoparticle motions one at a time, we find that the development of supracrystal facets follows a layer-by-layer and directional growth mechanism, resembling that for atomic crystals. The conceptual similarity between our colloidal crystal and atomic Kossel crystal also allows a precise kinetics control over the crystal growth process, which eventually leads to distinct equilibrium structures. Our study provides detailed dynamic information over the supracrystal growth process, which can serve as a general guideline for materials design and engineering from the bottom-up.