Two-dimensional hopping of aqueous colloidal clusters on commensurate surface wells.

ORAL

Abstract

Hopping of colloidal clusters in various shapes and sizes that are mainly confined within commensurate surface wells except for diffusing between them by Brownian motion is studied. The mobility of clusters decreases nonmonotonically with increasing cluster size. The mobility proceeds, depending on cluster shape, by different jumping mechanisms such as zigzagging or translation without rotation; this produces nonmonotonic changes of mobility when, at fixed cluster size, cluster shape varies. Unlike atomic clusters that change configuration and dissociate easily, these colloidal clusters are very stable and each type of jump can be identified separately. Hopping rate, diffusion and different jumping mechanisms that are associated with them will be discussed for various sizes and shapes of clusters.

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Authors

  • Minsu Kim

    Physics, UIUC

  • Stephen Anthony

    Department of Chemistry, University of Illinois, Chemistry, UIUC, Dept of Chemistry, University of Illinois at Urbana-Champaign, University of Illinois, Dept of Chemistry, Univ of Illinois at Urbana-Champaign

  • Steve Granick

    Department of Materials Science and Engineering, University of Illinois, University of Illinois, Urbana-Champaign, material science and engineering, UIUC, Materials Science and Engineering, University of Illinois, Dept of Materials Science \& Engineering, University of Illinois at Urbana-Champaign, Dept. Materials Science and Engineering, University of Illinois at Urbana-Champaign, University of Illinois at Urbana-Champaign, University of Illinois, Dept of Materials Science \& Engineering, Univ of Illinois at Urbana-Champaign, Material Science and Engineering, UIUC