Phase separation in thin films: Effect of temperature gradients
1 Institut für Physik, Johannes Gutenberg - Universität Mainz - Staudinger Weg 7, D-55099 Mainz, Germany, EU
2 School of Physical Sciences, Jawaharlal Nehru University - New Delhi-110067, India
Received: 1 July 2013
Accepted: 18 September 2013
We study the phase-separation kinetics of a binary (AB) mixture confined in a thin film of thickness D with a temperature gradient. Starting from a Kawasaki-exchange kinetic Ising model, we use a master-equation approach to systematically derive an extension of the Cahn-Hilliard model for this system. We study the effect of temperature gradients perpendicular to the film with “neutral” (no preference for either A or B) surfaces. We highlight the rich phenomenology and pattern dynamics which arises from the interplay of phase separation and the temperature gradient.
PACS: 64.75.Gh – Phase separation and segregation in model systems (hard spheres, Lennard-Jones, etc.) / 64.75.St – Phase separation and segregation in thin films / 68.35.Rh – Phase transitions and critical phenomena
© EPLA, 2013