Abstract
Adsorption process and order formation of colloidal nanoparticles onto a planar surface are examined. We perform Brownian Dynamics simulations with a three dimensional cell model, in which the particle particle and particle substrate interactions are modeled on the DLVO theory, and examine the effects of the frictional force acting between adsorbed particles and the substrate onto the adsorbed structure formed on the substrate. The results obtained are as follows. When the frictional force is so strong that the adsorbed particles are stuck to the substrate, ordered structures never form, which seems to be quite natural. On the other hand, when the magnitude of the frictional force is moderate, an ordered structure can form even with lower coverage; the frictional force can help order formation. This is because the frictional force restricts the particles' Brownian motion that disturbs the ordered structure on the substrate. Furthermore, through the detailed examination of the distribution of the Brownian motion, the increase in the frictional force is found to play a similar role to the decrease in temperature.
