Structure formation in concentrated polydisperse aqueous dispersions of detonation nanodiamond (DND) depending on solid content (0.2–2 wt%) and electrolyte concentration (10-4 М – 10-11 M NaCl) was studied
experimentally and theoretically. Viscosity was determined by the rotational viscometry along with the study of sedimentation type. The energy of pair interaction of one-sized and different-sized primary aggregates of
nanoparticles is calculated within the framework of the classical and extended DLVO theory on the assumption of a constant surface charge using the effective Hamaker constant, which takes into account the porous structure of
the aggregate. The calculation results were used to plot the total potential interaction curves of the three particles. It has been shown that calculations taking into account collective interactions within the framework of the extended DLVO theory may well be used to refine experimental data and predict the stability of concentrated DND dispersions.