ABSTRACT
In considering the rate of aggregation, it should be remembered that, because of particle interactions, not all collisions may be successful in producing aggregates. The fraction of successful collisions is the collision efficiency (see Chapter 4 Section 4.4.4). If there is strong repulsion between particles, then practically no collision results in an aggregate and α ≈ 0. When there is no significant net repulsion or when there is an attraction between particles, then the collision efficiency will be around unity.
