Huge broadening of the crystal-fluid interface for sedimenting colloids
Institut für Theoretische Physik, Heinrich-Heine-Universität Düsseldorf - D-40225 Düsseldorf, Germany
2 Joint Institute for High Temperatures, Russian Academy of Sciences - Izhorskaya 13/19 , 117419 Moscow, Russia
3 Department of Physics, Case Western Reserve University - Cleveland, 44106 OH, USA
Accepted: 20 June 2011
For sedimenting colloidal hard spheres, the propagation and broadening of the crystal-fluid interface is studied by Brownian dynamics computer simulations of an initially homogeneous sample. Two different types of interface broadenings are observed: the first occurs during growth and is correlated with the interface velocity, the second is concomitant with the splitting of the crystal-fluid interface into the crystal-amorphous and amorphous-liquid interfaces. The latter width is strongly peaked as a function of the gravitational driving strength with a huge amplitude relative to its equilibrium counterpart.
PACS: 82.70.Dd – Colloids / 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc. / 87.15.A- – Theory, modeling, and computer simulation
© EPLA, 2011