Icosahedral twins
Videos
An icosahedral twin is an atomic structure found in atomic clusters and also nanoparticles with some thousands of atoms. Their atomic structure is slightly different from what is found for bulk materi
Electron micrograph of two icosahedral adenoviruses, with an illustration to show the shape
Shapes for different surface energies as indicated and described in the text
Extended Wulff constructions
Videos
Extended Wulff constructions refers to a number of different ways to model the structure of nanoparticles as well as larger mineral crystals. They can be used to understand the shape of gemstones and
Icosahedral twins
…The external surface shape for given values of the surface energy can be generated from a modified Wulff construction, and is not always that of a simple icosahedron; there can be additional facets leading to a more spherical shape as illustrated in the figure. Depending…
Decision tree for shapes of particles, adapted from Boukouvala, Daniel and Ringe
Experimental image of a gold nanoparticle (top) on ceria at the top, and a corresponding Winterbottom model at the bottom with green for (111) and brown form (001 with the substrate in blue).
Fiveling (decahedral nanoparticle) showing diffusion growth at tips