Friday, July 13, 2012

1207.2942 (Jun Jie Liu et al.)

Modeling the Influence of Antifreeze Proteins on Three-Dimensional Ice
Crystal Melt Shapes using a Geometric Approach

Jun Jie Liu, Yangzong Qin, Maya Bar Dolev, Yeliz Celik, J. S. Wettlaufer, Ido Braslavsky
The melting of pure axisymmetric ice crystals has been described previously by us within the framework of so-called geometric crystal growth. Nonequilibrium ice crystal shapes evolving in the presence of hyperactive antifreeze proteins (hypAFPs) are experimentally observed to assume ellipsoidal geometries ("lemon" or "rice" shapes). To analyze such shapes we harness the underlying symmetry of hexagonal ice Ih and extend two-dimensional geometric models to three-dimensions to reproduce the experimental dissolution process. The geometrical model developed will be useful as a quantitative test of the mechanisms of interaction between hypAFPs and ice.
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