title: Clusters of charged Janus spheres.
abstract: We study the assembly of spherical particles with opposite electric charge on both hemispheres, in the case that the particle diameter exceeds the electrostatic screening length. Clusters result, not strings. The cluster shapes are analyzed by combined epifluorescence microscopy and Monte Carlo computer simulations with excellent agreement, indicating that the particles assemble in aqueous suspension to form equilibrated aggregates. The simulations show that charge asymmetry of individual Janus particles is preserved in the clusters.
authors.affiliation: Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, USA.
authors.forename: Liang
authors.initials: L
authors.lastname: Hong
authors.forename: Angelo
authors.initials: A
authors.lastname: Cacciuto
authors.forename: Erik
authors.initials: E
authors.lastname: Luijten
authors.forename: Steve
authors.initials: S
authors.lastname: Granick
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003198:Computer Simulation; D008856:Microscopy, Fluorescence / Q000379:methods; D008958:Models, Molecular; D009010:Monte Carlo Method; D010316:Particle Size; D012680:Sensitivity and Specificity; D055672:Static Electricity
chemical_list: D003102:Colloids