Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 19: Granular matter I
DY 19.7: Vortrag
Mittwoch, 27. Februar 2008, 16:00–16:15, MA 004
Asymptotic Structure of Nanopowders — Thomas Schwager1, Dietrich E. Wolf2, and •Thorsten Pöschel3 — 1Charité Berlin, Institut für Unfallchirurgie — 2Universität Duisburg-Essen, Fachbereich Physik — 3Universität Bayreuth, Physikalisches Institut
We investigate the asymptotic structure of a nano-powder as it evolves as a result of a repeated break-and-deposition process. By means of numerical simulations we found that a two-dimensional packing of adhesive rigid particles converges to a loosely packed structure whose properties are determined by the fragment size. We characterize the asymptotic structure and the relaxation to the final state by means of the density, correlation function, coordination number and fractal dimension. Surprisingly, it was found that a) the final packing density is independent of the initialization, b) the short-range correlation function is independent of the fragment size, and c) the fractal dimension of the asymptotic structure is close the one, in agreement with a scaling argument.