| Abstract
| - The structure of colloidal clusters formed by long-range attractive interactions under diluted conditionsis studied by means of Monte Carlo simulations. For a not-too-long attraction range, clusters show self-similar internal structure with lower density than that typical for diffusive aggregation. For long-rangeinteractions, low κ, nonfractal clusters are formed (dense at short scales but open at long ones). Thedependence on the volume fraction shows that more-compact clusters are grown the higher the colloidaldensity for diffusive aggregation and attraction-driven aggregation in the fractal regime. The whole trendis explained in terms of the interpenetration among aggregates. In attraction-driven aggregations, theinterpenetration of clusters competes with aggregation in the tips of the clusters, causing low-densityclusters.
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