Dynamical Properties of Two-Dimensional Aggregates in Patchy Particle Systems

A two-dimensional system of aggregated patchy particles with three attractive spots on the surface is studied by means of molecular dynamics. The aggregated system has been obtained previously with the help of the Monte Carlo simulations. Velocity autocorrelations (ACF) and mean square displacements (MSD) have been presented for the cases of different densities exhibiting different stages of aggregation. The velocity autocorrelations obtained are strong and long lasting and ballistic and diffusive regions of the dynamics are recognized from MSD profiles. It is well distinguishable that larger aggregates are more capable to dissolve the information about the particles velocity. Angular velocity correlations are shown to exhibit unusual three stage characteristics with an intermediate almost linear state considered as an effect of the bond exchange mechanism.