  We simulated irreversible aggregation of non-interacting particles and of
particles interacting via repulsive and attractive potentials explicitly
implementing the rotational diffusion of aggregating clusters. Our study
confirms that the attraction between particles influences neither the
aggregation mechanism nor the structure of the aggregates, which are identical
to those of non-interacting particles. In contrast, repulsive particles form
more compact aggregates and their fractal dimension and aggregation times
increase with the decrease of the temperature. A comparison of the fractal
dimensions obtained for non-rotating clusters of non-interacting particles and
for rotating clusters of repulsive particles provides an explanation for the
conformity of the respective values obtained earlier in the well established
model of diffusion-limited cluster aggregation neglecting rotational diffusion
and in experiments on colloidal particles.
