Diffusion of a liquid nanoparticle on a disordered substrate

We perform molecular dynamic simulations of liquid nanoparticles deposited on a disordered substrate. The motion of the nanoparticle is characterized by a ``stick and roll'' diffusive process. Long simulation times $(\ensuremath{\simeq}\ensuremath{\mu}\mathrm{s})$, 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 ${N}^{1∕3}$.