Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 4: Crystallization, Nucleation and Self Assembly I

CPP 4.2: Vortrag

Montag, 31. März 2014, 09:45–10:00, ZEU 114

Testing nucleation theory for collidal crystals from estimates for the Laplace pressure in the fluid — •Antonia Statt, Peter Virnau, and Kurt Binder — Institut für Pysik, JGU Mainz

We use a soft extension of the well-known effective Asakura Oosawa model [1] to study phase coexistence of a crystal "droplet" surrounded by liquid with Monte Carlo Simulations. In classical nucleation theory, the barrier of homogeneous nucleation is given by two contributions, the energy gain of creating a droplet and the energy loss due to surface tension of the new created interface. The enhancement of the pressure in the surrounding liquid in comparison to the coexistence pressure, the so-called Laplace pressure, can be measured via the virial theorem [2]. With this we are able to compare the predictions of the classical nucleation theory without suffering from ambiguities occurring when one needs a microscopic identification of the crystalline droplet.
[1] M. Dijkstra, R. van Roij and R. Evans, Phys. Rev. E 59, 5744-5771, 1999
[2] D. Deb, A. Winkler, P. Virnau and K. Binder, J. Chem. Phys. 136, 134710, 2012