Publication Date:
2018-04-23
Description:
The morphology and growth kinetics of ice single crystals in
aqueous solutions of type III antifreeze protein (AFP-III) have been studied in
detail over a range of AFP-III concentrations and supercoolings. In pure water,
the shape of ice crystals changes from the circular disklike to planar dendritic with
increasing supercooling. In AFP-III solutions, ice crystals in the form of faceted
plates, irregular dendrites with polygonized tips, and needles appear with
increasing supercooling and AFP-III concentration. The growth rate of ice
crystals in the crystallographic a direction is 2 orders of magnitude higher than
that in the c direction. AFP-III molecules cause the stoppage of the growth of the
prismatic and basal faces at low supercoolings. When supercooling exceeds the critical value, AFP-III favors the acceleration of the growth in both a and c directions. The observed behavior of AFP-III is explained in terms of the Cabrera-Vermilyea pinning model and the specificity of the dissipation of latent heat from the growing crystals with different shapes.
Repository Name:
EPIC Alfred Wegener Institut
Type:
Article
,
isiRev
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