The Electroviscous Behavior of Aqueous Dispersions of Amorphous Silica (Ludox)

Structure of colloid silica determined by viscosity measurements

“…1 and 2 suggest that these dependencies can be well fitted by a linear regression that resulted in the silica density value of 2.32 g/cm 3 for S1 and 2.20 g/cm 3 for the S2 sam- ple. This agrees well with the literature data ranging from 2.215 to 2.305 g/cm 3 [9].…”

“…Usually, the deviation from the Einstein formula is interpreted in terms of the primary electroviscous effect according to the relationship [7,9] (4)…”

“…It can be estimated that for double-layer thicknesses smaller than particle dimensions (that is the case for all suspensions of practical interest) the significance of the primary electroviscous effect is rather minor, usually not exceeding a few percentages. However, in many experimental works concerned with colloid silica viscosity measurements much higher deviations from Einstein formula have been reported [7][8][9][10][11]. Since these effects were observed both for aqueous [7][8][9] and nonaqueous media (cyclohexane) [10,11] a proper interpretation should be sought in the fuzzy structure of the silica particles rather than in the primary electroviscous effect as pointed out in [9].…”

Modeling and electrokinetic evidences on the processes of the Al(III) sorption continuum in SiO2(s) suspension

“…According to the relative concentrations and contact methods, interactions between hydrous oxides and metals include (1) sorption, referring to the uptake of a dissolved metal by a solid phase, irrespective of the mechanism [16,23,24]; (2) adsorption, referring to a surface complexation reaction between surface sites and a metal sorbate [25]; and (3) surface precipitation, referring to the formation of a precipitate, induced by the sorbent surface under solution conditions that are undersaturated with respect to any known phase [26][27][28]. Depending on the type of interaction, metals exhibit various solubilities that can markedly alter their environmental mobility and removal efficiency during wastewater treatment [29][30][31].…”

Effects of polyethylenimine on the dispersibility of hollow silica nanoparticles

“…Liu and Guo [5] reduced the agglomeration between the particles remarkably by removing moisture in the wet ultra-fine SiO 2 filtration cake through an azeotropic distillation method. Laven et al [6] introduced KCl into the silica aqueous suspension and studied the change of zeta potentials with increasing pH value and KCl concentration. Carriere et al [7] obtained well-dispersed nanosized silica suspension by adsorbing polymethyl methacrylate (PMMA) on the particle surface, and studied the effects of PMMA on the rheological properties of the suspension.…”