The equilibrium intrinsic crystal-liquid interface of colloids

Details The equilibrium intrinsic crystal-liquid interface of colloids The equilibrium intrinsic crystal-liquid interface of colloids

2008-08-11

arxiv.org/abs/0808.1576v2

Proc Nat Acad Sci 106, 15198-15202 (2009)

Physics

Condensed Matter

Soft Condensed Matter

6 pages; revised version, submitted to PNAS

Scientific paper

10.1073/pnas.0904682106

We use confocal microscopy to study an equilibrated crystal-liquid interface in a colloidal suspension. Capillary waves roughen the surface, but locally the intrinsic interface is sharply defined. We use local measurements of the structure and dynamics to characterize the intrinsic interface, and different measurements find slightly different widths of this interface. In terms of the particle diameter $d$, this width is either $1.5d$ (based on structural information) or $2.4d$ (based on dynamics), both not much larger than the particle size. This work is the first direct experimental visualization of an equilibrated crystal-liquid interface.

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