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SUMMARY:First principles simulations of water-solid interfaces and the ini
 tial stages of ice nucleation - Angelos Michaelides\, London Centre for Na
 notechnology
DTSTART:20091015T150000Z
DTEND:20091015T160000Z
UID:TALK18731@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:Water is not easy to freeze! The homogeneous freezing point of
  pure water is some 30-40 degrees below zero. Invariably then when water f
 reezes it does so heterogeneously on the surface of some foreign particle.
  In this talk I will discuss our recent first principles simulations of su
 ch heterogeneous ice nucleation events on a variety of solid surfaces. I w
 ill show how the subtle interplay of bonding within the overlayers and to 
 the substrate conspires to yield a rich variety of structures\, including 
 even ice structures built from pentagons. I will also show how surprisingl
 y strong quantum nuclear effects can lead to hydrogen bond symmetrisation 
 in certain ice overlayers on metal surfaces
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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