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Science 19 August 2005:
Vol. 309. no. 5738, pp. 1198 - 1199
DOI: 10.1126/science.1116597
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Perspectives

PHYSICS:
Freezing and Melting: Action at Grain Boundaries

Peter N. Pusey

In his Perspective, Pusey discusses papers by Alsayed and de Villeneuve in this week's issue that examine the processes of melting and freezing. The movement of particles can be followed by video microscopy while thermosensitive colloidal particles are melted by temperature manipulation. Melting begins heterogeneously, with initial premelting occurring primarily at grain boundaries. In addition, freezing is impaired by the presence of impurities in the liquid, which preserve grain boundaries and prevent final uniform annealing of the crystal.

The author is in the Scottish Universities Physics Alliance (SUPA), School of Physics, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, UK. E-mail: p.n.pusey{at}ed.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)