Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: Focus: Polymer Crystallization - from Model Systems to New Materials I

CPP 35.8: Vortrag

Mittwoch, 22. März 2017, 12:30–12:45, ZEU 222

Lattice free energy functional for anisotropic particles with pure hard–core interaction and with short–ranged attractions — •Mostafa Mortazavifar and Martin Oettel — Institut für Angewandte Physik, Eberhard Karls Universität Tübingen, Tübingen, Germany

By using a free energy functional of fundamental measure type, the equilibrium properties of a pure hard–rod mixture and hard rods with short–ranged attractions are investigated in a lattice model where the position and the orientation of rods are restricted to discrete values. Attractions are incorporated via one or more species of polymeric lattice particles in the spirit of the Asakura–Oosawa model. By changing size and shape of these particles, effective attractions of different strength and range can be generated.

We have investigated phase diagrams of 2– and 3–dimensional bulk systems and of monolayers formed with 3–dimensional rods. Bulk 3–dimensional systems exhibit liquid–vapor and isotropic–nematic transitions similar to the systems with rods in continuum. For the monolayers, the continuous nematic transition remains present above a critical temperature and is superseded by a gas–liquid transition below the critical temperature.