Limits of the Fractal Dimension for Irreversible Kinetic Aggregation of Gold Colloids

TLDR: On montre qu'il existe 2 regimes d'agregation cinetique, irreversible, de colloides aqueux, determinee par le potentiel interparticulaire a courte distance, avec controle de la probabilite de collage lors de l'approche de 2 particules.

Abstract: We show that there are two regimes of irreversible, kinetic aggregation of aqueous colloids, determined by the short-range interparticle potential, through its control of the sticking probability upon approach of two particles. Each regime has different rate-limiting physics, aggregation dynamics, and cluster-mass distributions, and results in clusters with different fractal dimensions. These results set limits on the fractal dimension, ${d}_{f}$, for gold aggregates of $1.75l~{d}_{f}l~2.05$ (\ifmmode\pm\else\textpm\fi{}0.05).