Anisotropic elasticity of experimental colloidal Wigner crystals

Citation:

Russell, E. R. ; Spaepen, F. ; Weitz, D. A. Anisotropic elasticity of experimental colloidal Wigner crystals. Phys. Rev. E 2015, 91, 032310. Copy at http://www.tinyurl.com/y22xchau
2015_pre_russell.pdf1.36 MB

Date Published:

Mar

Abstract:

Colloidal particles interacting via a long-range repulsion can, in contrast to hard-sphere systems, exhibit crystalline ordering at low volume fraction. Here we experimentally investigate the structure and properties of such “colloidal Wigner crystals.” We find a body-centered-cubic crystalline phase at volume fractions of ϕ≳15%, which exhibits large fluctuations of individual particles from their average positions. We determine the three independent crystalline elastic constants and find that these crystals are very compliant and highly anisotropic.

Publisher's Version

Last updated on 11/13/2020