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Recently reported colloidal aggregation data obtained for differentmonovalent salts (NaCl, NaNO$_3$, and NaSCN) and at high electrolyteconcentrations are matched with the stochastic solutions of the master equationto obtain bond average lifetimes and bond formation probabilities. This wasdone for a cationic and an anionic system of similar particle size and absolutecharge. Following the series Cl$^-$, NO$_3^-$, SCN$^-$, the parameters obtainedfrom the fitting procedure to the kinetic data suggest: i) The existence of apotential of mean force (PMF) barrier and an increasing trend for it for bothlatices. ii) An increasing trend for the PMF at contact, for the cationicsystem, and a practically constant value for the anionic system. iii) Adecreasing trend for the depth of the secondary minimum. This complex behavioris in general supported by Monte Carlo simulations, which are implemented toobtain the PMF of a pair of colloidal particles immersed in the correspondingelectrolyte solution. All these findings contrast the Derjaguin, Landau,Verwey, and Overbeek theory predictions.

Ion-specific colloidal aggregation: population balance equations and potential of mean force