title: The role of curvature anisotropy in the ordering of spheres on an ellipsoid.
abstract: Non-spherical emulsion droplets can be stabilized by densely packed colloidal particles adsorbed at their surface. In order to understand the microstructure of these surface packings, the ordering of hard spheres on ellipsoidal surfaces is determined through large scale computer simulations. Defects in the packing are shown generically to occur most often in regions of strong curvature; however, the relationship between defects and curvature is nontrivial, and the distribution of defects shows secondary maxima for ellipsoids of sufficiently high aspect ratio. As with packings on spherical surfaces, additional defects beyond those required by topology are observed as chains or "scars". The transition point, however, is found to be softened by the anisotropic curvature which also partially orients the scars. A rich library of symmetric commensurate packings are identified for low particle number. We verify experimentally that ellipsoidal droplets of varying aspect ratio can be arrested by surface-adsorbed colloids.
authors.affiliation: Tufts University, Department of Physics and Astronomy, Center for Nanoscopic Physics, 5 Colby Street, Medford, Massachusetts 02155, USA. timothy.atherton@tufts.edu.
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Burke
authors.forename: Badel L
authors.initials: BL
authors.lastname: Mbanga
authors.forename: Zengyi
authors.initials: Z
authors.lastname: Wei
authors.forename: Patrick T
authors.initials: PT
authors.lastname: Spicer
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Atherton