title: Equilibrium Shape of Colloidal Crystals.
abstract: Assembling colloidal particles into highly ordered configurations, such as photonic crystals, has significant potential for enabling a broad range of new technologies. Facilitating the nucleation of colloidal crystals and developing successful crystal growth strategies require a fundamental understanding of the equilibrium structure and morphology of small colloidal assemblies. Here, we report the results of a novel computational approach to determine the equilibrium shape of assemblies of colloidal particles that interact via an experimentally validated pair potential. While the well-known Wulff construction can accurately capture the equilibrium shape of large colloidal assemblies, containing O(10(4)) or more particles, determining the equilibrium shape of small colloidal assemblies of O(10) particles requires a generalized Wulff construction technique which we have developed for a proper description of equilibrium structure and morphology of small crystals. We identify and characterize fully several "magic" clusters which are significantly more stable than other similarly sized clusters.
authors.affiliation: Department of Chemical Engineering, Princeton University , Princeton, New Jersey 08544, United States.
authors.forename: Ray M
authors.initials: RM
authors.lastname: Sehgal
authors.affiliation: Department of Chemical Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Maroudas