Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Crystallization, Nucleation and Self Assembly II
CPP 28.3: Vortrag
Mittwoch, 13. März 2013, 15:45–16:00, H40
Heterogeneous Nucleation in colloidal melts at periodically structured substrates — •Achim Lederer1 and Hans Joachim Schöpe2 — 1Johannes Gutenberg Universität, Mainz, Germany — 2Max Planck Institut für Polymerforschung, Mainz, Germany
Monodisperse suspensions of colloidal spheres with known interaction are a terrific model system for testing predictions by statistical physics. Their typical length scales are accessible via optical methods like light scattering in reciprocal and microscopy in real space. We investigate heterogeneous nucleation and the microstructure evolution of colloidal model systems with hard sphere like behavior by Confocal Laser Scanning Microscopy (CLSM) observing local parameters on a single particle scale. In our studies we observe heterogeneous nucleation at fcc(111) patterned substrates as function of lattice spacing. By analyzing local order parameters we locate crystalline particles in clusters, determining cluster sizes and shape during nucleation and growth. By varying the lattice spacing we observe a transition from a commensurable to an incommensurable situation.