Shifts of the critical coagulation concentration (CCC) in particle suspensions in salt solutions containing multivalent co-ions and monovalent counterions are rationalized. One observes that the CCC is inversely proportional to the valence, and this behavior is referred to as the inverse Schulze-Hardy rule. This dependence is established by means of measurements of the stability ratio for posit...

Air-bubble coalescence in aqueous electrolytic solutions, following quasi-static approach, was studied in order to understand its slow rate in purified water and high rate in electrolytic solutions. The former is found to be due to surface charges, originating from the speciation of dissolved CO2, which sustain the electric double layer repulsion. Rapid coalescence in electrolytic solutions is ...

Chemical factors and physical constraints lead to coupled effects during particle transport in unsaturated porous media. Studies on unsaturated transport as typical for soils are currently scarce. In unsaturated porous media, particle mobility is determined by the existence of an air-water interface in addition to a solid-water interface. To this end, we measured breakthrough curves and retenti...

Ilmenite disseminated grain size is relatively fine, and it must be finely ground to fully separate ilmenite from gangue then produce fine-grained minerals, which deteriorates flotation. A novel method using buoyant carriers improve the recovery of fine in froth flotation was introduced this study. Hydrophobized glass bubbles (HGB) as carrier materials were obtained by an efficient, simple modi...

This paper outlines a framework for using molecular dynamics to simulate the compression of kaolinite saturated at alkaline pH (=8) in low (1 mM) concentration solution. The particles are modelled as flat (3D) ellipsoids and their interactions described by modified form Gay-Berne potential, calibrated against DLVO theory. LAMMPS software was used generate monodisperse slightly polydisperse samp...

The hydration interaction is responsible for the colloidal stability observed in protein-coated particles at high ionic strengths. The origin of this non-DLVO interaction is related not only to the local structure of the water molecules located at the surface but also to the structure of those molecules involved in the hydration of the ions that surround the colloidal particles. Ruckenstein and...

The movement of the gas–liquid interface caused by bubble position will have an impact on starting conditions for particle migration. This article quantifies influence moving bubbles migration in non-Newtonian fluids, and it aims to better understand fluids achieve more effective control. First, forces moments acting particles are analyzed; then, fluid dynamics, mechanics, extended DLVO (Derjag...

Based on direct numerical simulations of the coupled motion of particles and fluid, this study analyzes the collective hydrodynamic and colloidal effects of flowing microparticles during the formation of different 3D clogging patterns at a pore entrance. Simulations of flowing suspensions through a pore with various simulation conditions show that particle concentration and surface interactions...

In the Comment by Grier and Crocker (preceding paper) the authors tried to refute our criticism [Phys. Rev. E 58, 2237 (1998)] on their work [J. C. Crocker and D. G. Grier, Phys. Rev. Lett. 77, 1897 (1996)] by simply fitting once again their old experimental data. Grier and Crocker claim that their pair-potential measurements on aqueous dilute suspension of charged colloidal particles confined ...

Undoubtedly, the DLVO theory has been and it is still very useful for explaining the stability of colloidal dispersions. This theory was independently developed by Derjaguin and Landau [1] and by Verwey and Overbeek [2] in the forties. According to this theory, the total interaction potential (VT) between two colloidal particles is the sum of the repulsive electrostatic interaction energy (VE) ...