Diffusion of a liquid nanoparticle on a disordered substrate

Details Diffusion of a liquid nanoparticle on a disordered substrate Diffusion of a liquid nanoparticle on a disordered substrate

2004-06-25

arxiv.org/abs/cond-mat/0406625v1

Physics

Condensed Matter

Materials Science

Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.115402

We perform molecular dynamic simulations of liquid nanoparticles deposited on a disordered substrate. The motion of the nanoparticle is characterised by a 'stick and roll' diffusive process. Long simulation times ($\simeq \mu s$), analysis of mean square displacements and stacking time distribution functions demonstrate that the nanoparticle undergoes a normal diffusion in spite of long sticking times. We propose a phenomenological model for the size and temperature dependence of the diffusion coefficient in which the activation energy scales as $N^{1/3}$.

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