Journal ArticleDOI
Effect of humic acid adsorption on the rheological properties of sodium montmorillonite suspensions
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TLDR
In this article, the rheological behavior of Na-montmorillonite (NaMt) suspensions in the presence of humic acid is analyzed and it is shown that the electric charges on plate and edge surfaces of clay particles largely determine the formation of three-dimensional structures in suspensions.Abstract:
In this work we analyze the rheological behavior of Na-montmorillonite (NaMt) suspensions in the presence of humic acid. The analysis starts from the fact that the electric charges on plate and edge surfaces of clay particles largely determine the formation of three-dimensional structures in suspensions. Zeta potential data of NaMt as a function of humic acid (HA) concentration suggest that its adsorption takes place preferentially on the edges of the particles. A good correlation between the parameters describing the viscosity-shear rate or viscosity-shear stress dependencies and the product of the ζ potentials of edges and faces, ζedge×ζface, is demonstrated. It indicates that the rheological behavior of NaMt suspensions is largely controlled by electrostatic interactions. Adsorption of HA also changes the viscoelastic properties of the suspensions significantly as determined by both oscillometric and creep-recovery tests. A trend of NaMt suspensions from approximately solid like when no HA is adsorbed,...read more
Citations
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Colloidal behavior of aqueous montmorillonite suspensions: The specific role of pH in the presence of indifferent electrolytes
Etelka Tombácz,Márta Szekeres +1 more
TL;DR: In this article, the acid-base titration of Na-montmorillonite suspensions between pH 4 and 9 at 0.01, 0.1 and 1 M NaCl was used to characterize pH-dependent charge development on amphoteric edge sites and to determine the point of zero charge (PZC) of edges.
Journal ArticleDOI
Stabilization of magnetorheological suspensions by polyacrylic acid polymers
TL;DR: The best conditions to obtain stable suspensions were found when strong steric and hydrophilic repulsions hinder the coagulation between polymer-covered particles, simultaneously avoiding sedimentation by the thickening effect of the polymer solution.
Journal ArticleDOI
Factors Affecting Zeta Potential of Iron Oxides
J. J. Carlson,S. K. Kawatra +1 more
TL;DR: In this article, a review examines the factors that affect the isoelectric point (IEP) and the magnitude of the Zeta potential for natural hematite surfaces.
Journal ArticleDOI
Preparation and sedimentation behavior in magnetic fields of magnetite-covered clay particles.
C. Galindo-Gonzalez,J. de Vicente,M.M. Ramos-Tejada,Modesto T. López-López,Fernando González-Caballero,Juan D. G. Durán +5 more
TL;DR: The different relative orientation of the clay-magnetite particles are discussed in order to predict the most favored flocculi configuration, and van der Waals and dipole-dipole magnetic attractions between magnetite-covered clay particles dominate the flocculation processes.
Journal ArticleDOI
Interfacial and rheological properties of humic acid/hematite suspensions.
TL;DR: The results are consistent with a stabilizing effect of HA adsorption on the suspensions, mainly as a consequence of the increased electrostatic repulsion between particles.
References
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Journal ArticleDOI
The colloidal and rheological properties of bentonite suspensions
Paul F. Luckham,Sylvia Rossi +1 more
TL;DR: A comprehensive review of the most relevant studies of the adsorption of non-ionic surfactants and polymers onto both silica and clay is presented in this article, along with the effect of electrolytes, polymers, high pressure and high temperature on the flow behaviour of Na+-montmorillonite suspensions.
Journal ArticleDOI
Surface chemistry-rheology relationships in concentrated mineral suspensions
TL;DR: In this article, the yield stress of concentrated aqueous suspensions of alumina, zirconia and kaolin can be controlled through regulation of pH and the addition of inorganic electrolytes, ionic surfactants and polyelectrolytes (polymers).
Journal ArticleDOI
Colloidal properties of humic substances
TL;DR: There have been several approaches to the molecular modelling of metal ion binding based on the representation of humic molecules as colloidal particles with an associated electrical double layer as mentioned in this paper, and various theoretical models have been described and the relative merits of the approaches compared.
Journal ArticleDOI
Electrophoresis and zeta potential of kaolinite
David J. Williams,K.P Williams +1 more
TL;DR: In this paper, the effects of such parameters as preparation technique, pH, and sodium chloride concentration on the electrophoretic mobility of sodium kaolinite are examined using the single-particle microelectrophoresis technique.
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