Regensburg 2010 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 6: Poster Session I
DY 6.24: Poster
Montag, 22. März 2010, 16:00–18:00, Poster B2
Brownian motion of heated particles — •Daniel Rings1, Dipanjan Chakraborty1, Markus Selmke2, Romy Radünz2, Frank Cichos2, and Klaus Kroy1 — 1ITP, Uni Leipzig, Germany — 2EXP1, Uni Leipzig, Germany
We derive the generalized Markovian description for the non-equilibrium Brownian motion of a heated particle in a simple solvent with a temperature-dependent viscosity. Our approximate analytical results for the generalized fluctuation-dissipation and Stokes-Einstein relations compare favorably with measurements of laser-heated gold nano-particles and provide a practical rational basis for emerging photothermal tracer techniques. We also compare our analytic results with a numerical solution of the hydrodynamic equations and find good agreement after a parameter-free but non-trivial rescaling. To gain insight into the microscopic basis for the effective equations and boundary conditions, we study the heat and solvent flow around the particle in molecular resolution by means of GPU-enhanced parallel MD simulations.