Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 38: Nanostructured Materials V

MM 38.3: Vortrag

Donnerstag, 28. Februar 2008, 12:15–12:30, H 0111

Sintering of Metallic Nanoparticles — •Ralf Meyer and Peter Entel — Theoretische Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany

With the growing interest in the production of nanoparticles with well defined physical properties for novel technological applications, the sintering of nanoparticles has become an increasingly important subject. In this work, the sintering of metallic nanoparticles is studied at temperatures of 800 and 1000 K over periods of up to 200 ns with the help of molecular-dynamics simulations. Simulations of the sintering of two Ni nanoparticles with diameters of approximately 4 nm show that a small-angle grain boundary with a corresponding (partial) dislocation grid is formed shortly after the particles make contact. The grain boundary remains stable over a period of several nanoseconds, until the dislocations disappear from the system. The disappearance of the disocations leads to a simultaneous rotation of the grains so that a single-crystalline particle is formed. In addition to the simulations of the sintering of two particles, results will be shown of the simulation of the sintering of 300 particles containing several million atoms into a single 40 nm sized particle.