Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 18: Critical Phenomena and Phase Transitions

DY 18.1: Vortrag

Montag, 12. März 2018, 15:30–15:45, BH-N 333

Heterogeneous crystal nucleation on and far away from the pre-structured seeds — •Swetlana Jungblut — Physikalische Chemie, TU Dresden

We investigate the impact of the simultaneous presence of two seeds with various structures on the process of crystal nucleation in an undercooled Lennard-Jones fluid by means of computer simulations. In the presence of seeds with face- and body-centered cubic structures, we find that decreasing the inter-seed distance enhances the probability of the crystalline clusters formed on one of the seeds to grow beyond the critical size, thus, increasing the crystal nucleation rates. In contrast, when seeds have an icosahedral structure, the crystalline clusters form mostly in the bulk. The crystal nucleation rate, however, is also determined by the distance between the seeds, pointing to a heterogeneous crystal nucleation that occurs away from the icosahedrally structured seeds.