Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 70: Crystallization, Nucleation and Self-Assembly II

CPP 70.3: Vortrag

Donnerstag, 15. März 2018, 15:45–16:00, C 230

Additive modified crystallization in binary Lennard Jones system — •Bhaskar Sen Gupta, Marc Radu, and Kurt Kremer — Max Planck Instutute for Polymer Research, Mainz, Germany

Additive modified crystallization is ubiquitous in nature, e.g., during the growth of calcitic stalactites, of mollusk shells or of bone structures. Control of crystallization by additives has applications in many areas of science and technology, such as production of pharmaceuticals, semiconductors, and nonlinear optics, as well as formation of biominerals. We employ computer simulation to study the additive enhanced crystal growth in a binary Lennard Jones mixture under different scenarios. The crystal growth rate, the structure of the liquid solid interface and the interface morphologies strongly depend on the miscibility of the components. An accelerated crystal growth is observed for systems of poor solubility. We find the growth of different types of crystals and the growth dynamics depend on the structure of the interface which is determined by the solubility of the (non-crystalizing) minority component. It is also observed that the crystal growth mechanism follows the predictions of the Kardar-Parisi-Zhang theory in 2 + 1 dimensions for well miscible Lennard Jones mixtures.