We attempt to simulate the heterogeneous nucleation of ice at model silver-iodide surfaces and find relatively facile ice nucleation and growth at the Ag+ terminated basal face, but never see nucleation at the I− terminated basal face or the prism and normal faces. Water molecules strongly adsorb onto the Ag+ terminated face to give a well-ordered hexagonal ice-like bilayer that then acts as a template for further ice growth.
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