Bulletin of the American Physical Society
APS March Meeting 2021
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session E07: Self-and Directed Assembly (Equilibrium and Non-equilibrium) I
8:00 AM–10:48 AM,
Tuesday, March 16, 2021
Sponsoring Unit: DSOFT
Chair: Jessica Sun, Harvard University
Abstract: E07.00003 : Colloidal crystallization on a cone*
8:24 AM–8:36 AM
(University of Colorado Boulder)
David R. Nelson
Vinothan N Manoharan
Using confocal microscopy, we watch colloidal particles assemble by short-ranged depletion interactions onto a tapered glass fiber. For a cone with a low opening angle, the fiber is approximately cylindrical. In this case, we find that defect-free crystals wrap around the fiber, forming seams when they meet themselves. At slightly larger opening angles, the seams open, forming wedge-shaped voids. At even larger opening angles, the particles assemble into smaller, seemingly randomly oriented crystalline domains. We will discuss how these structures might arise and how these studies may be used to understand crystal growth on more general curved surfaces.
***Supported by the National Science Foundation through the Harvard Materials Research Science and Engineering Center (DMR-2011754).
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