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Phase Transitions in Restricted Geometries and at Grain Boundaries: Wetting, Filling and All That.
Probability| Speaker: | Douglas Abraham, Theoretical Physics, University of Oxford. |
| Location: | 693 Kerr |
| Start time: | Tue, Mar 9 2004, 3:10PM |
Description
This seminar will begin with a review of what is known about the structure
of interfaces between coexistent equilibrium pure phases in the planar
Ising Ferromagnet. The phenomenological, thermodynamically motivated
picture of phase separation is seriously inadequate with a number of
interesting consequences. Some of these are exemplified by introducing a
substrate, giving two typical problems: firstly, when the substrate edge
is straight line, we have half-plane problems, for which the concepts of
wetting, sessile drops and contact angles are pertinent. Secondly, with a
corner-shaped lattice, there is a new phenomenon -filling. Finally, novel
phenomena occur when interfaces cross grain boundaries at controlled
angles. The second part of the talk will discuss briefly the main
technical features of the calculations without going into much detail.
This will be followed by some speculations about future research
directions.