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
Nanoparticle
Videos
A nanoparticle or ultrafine particle is a particle of matter 1 to 100 nanometres in diameter. The term is sometimes used for larger particles, up to 500 nm, or fibers and tubes that are less than 100
TEM (a, b, and c) images of prepared mesoporous silica nanoparticles with mean outer diameter: (a) 20nm, (b) 45nm, and (c) 80nm. SEM (d) image corresponding to (b). The insets are a high magnification of mesoporous silica particle.
Idealized model of a crystalline nanoparticle of platinum, about 2 nm in diameter, showing individual atoms.
Nanostars of vanadium(IV) oxide (VO2) exhibiting a crystal clusters structure resembling that of desert roses
1 kg of particles of 1 mm3 has the same surface area as 1 mg of particles of 1 nm3