Berlin 2008 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: POSTERS Colloids, Nanoparticles and Aggregates

CPP 21.3: Poster

Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A

Self--assembly driven pattern formation of dendron--like macromolecules on a structured surface — •Marta Balbás-Gambra, Erwin Frey, and Thomas Franosch — Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience, Ludwig-Maximilians Universität, München

Dendron--like macromolecules have been observed to self--assemble into a broad variety of patterns on top of graphite surfaces. We have developed a theoretical model to understand the nature of this assembly and explored the phase behavior as a function of temperature and density. The interaction between the macromolecules is described by an interaction--site model, which largely simplifies the complexity and reduces the model to a few points representing both the aromatic rings and carbonated chains of the molecule. The attraction between chains of different molecules is accounted for by a short ranged potential (Lennard--Jones), whereas the strong repulsion of the aromatic rings is encoded in a hard--sphere interaction. Suitable order parameters are introduced to describe the ensuing ordered phases and corresponding patterns. The phase behavior is explored employing extensive Monte--Carlo simulations.