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Figures

  figure177
Figure 1: Metastable colloidal crystallites adrift in a colloidal fluid after 10 minutes melting. The scale bar denotes tex2html_wrap_inline559 in a tex2html_wrap_inline561 field of view.

  figure184
Figure 2: (a) Video micrograph of the surface plane of a faceted colloidal crystal in contact with a dilute colloidal fluid. The dashed line demarks a (110) facet of the crystallite, while the arrow points out a sphere about to attach to the surface. (b) Trajectories of the spheres in (a) taken over 15 seconds. Dark trajectories are part of the crystal and light are in the fluid.

  figure191
Figure 3: Metastable cluster of 10 spheres against a glass wall. The appearance of clusters such as this and the lack of smaller clusters suggest that the maximum unstable radius is tex2html_wrap_inline433 . (a) The initial 10 sphere cluster highlighted by a green circle. The arrow indicates the direction in which a sphere will eventually leave the surface. (b) The same cluster 6 seconds later when one sphere detaches. The crystallite has drifted in the interval. The next two spheres to detach are indicated by arrows. (c) After another 2 seconds, the cluster is down to 7 spheres (d) One second later, the crystal has completely dissipated.

  figure200
Figure 4: Interaction potential as a function of center-to-center separation for a pair of 0.65 tex2html_wrap_inline537 diameter polystyrene sulfate spheres near a charged glass surface. The experimental geometry is represented schematically in the inset. The upper curve was measured a distance tex2html_wrap_inline543 from the nearest wall and has been offset by tex2html_wrap_inline493 vertically for clarity. The dashed line is a fit to Eq. (1). The lower curve was acquired at tex2html_wrap_inline539 and has an attractive minimum roughly tex2html_wrap_inline573 deep for spheres separated by more than five diameters.


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Next: About this document Up: Like-Charge Attractions in Metastable Previous: Acknowledgements

David G. Grier
Mon Dec 2 14:09:59 CST 1996