Dresden 2011 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 10: Posters I
DY 10.21: Poster
Montag, 14. März 2011, 17:00–19:00, P4
Molecular dynamics simulation of hot Brownian motion — •Dipanjan Chakraborty1,2, Daniel Rings1, Frank Cichos2, and Klaus Kroy1 — 1ITP, University of Leipzig, Germany — 2EXP-I, University of Leipzig, Germany
We present a molecular dynamics (MD) study of “hot Brownian motion”, a scenario in which a nanoparticle is kept at an elevated temperature with respect to the ambient fluid. This situation is experimentally realized when a light-absorbing tracer particle diffuses in the focus of a laser. Because of the separation of time scales between heat propagation and Brownian motion, a steady temperature profile develops around the nanoparticle, which can be detected by a second laser [1]. Our MD simulations are used to investigate various microscopic phenomena associated with “hot Brownian motion”, including effective temperatures and non-equilibrium hydrodynamic boundary conditions. The results are compared to recent analytical predictions obtained from fluctuating hydrodynamics [2].
[1] R. Radünz, D. Rings, K. Kroy, and F. Cichos, J. Phys. Chem. A 113 (9), 1674-1677 (2009)
[2] D. Rings, R. Schachoff, M. Selmke, F. Cichos, and K. Kroy, Phys. Rev. Lett., 105 (9), 090604 (2010)