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The interaction potential between two colloidal particles typically spans afew nanometers. Hence the correct appraisal of the potential in simulationsrequires very short time steps. However, it is often possible to combine onemany-particle calculation with several two-particle simulations in order toestimate a set of aggregation rates. As in the theory of Fuchs, this procedurecombines the evaluation of the fastest flocculation rate with the calculationof several stability ratios. This methodology was already tested in systemswhich exhibit low repulsive barriers for primary minimum flocculation. In thisarticle, the procedure is modified in order to calculate an average rate forsecondary minimum flocculation. The technique is then used to estimate theinfluence of drop deformation on the aggregation rate of hexadecane-in-waternano-emulsions stabilized with sodium dodecylsulfate (SDS).

Use of two-particle simulations for the evaluation of the flocculation rate in the case of insurmountable repulsive barriers