Journal ArticleDOI
Adsorption of polyacrylamide on silica particles and its effect on the rheological properties of suspensions
Yasufumi Otsubo,Kaoru Umeya +1 more
- Vol. 95, Iss: 1, pp 279-282
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Abstract:
The adsorption of polyacrylamide (PAAm) on silica particles and its effect on the rheological properties of the suspensions were studied with a coaxial cylinder rheometer. The two unusual observations are reported. First, for suspensions prepared with PAAm solution in glycerin, the apparent viscosity of suspensions is lower than that of the medium. Adsorption experiments showed that a large amount of polymer was adsorsed on the particles. It is concluded that the decrease in polymer concentration in the liquid phase by adsorption is primarily responsible for the decrease in the apparent viscosity of the suspensions. Second, for suspensions prepared with PAAm solution in a glycerine/water mixture, the apparent viscosity irreversibly increases above the critical shear rate. This behavior may be originated from flocculation by shear-induced irreversible bridging.read more
Citations
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Journal ArticleDOI
Rheology of simple and multiple emulsions
TL;DR: In this article, a comprehensive review of the rheology of simple and multiple emulsions is presented, with special attention given to the models describing the RHEology of these systems.
Journal ArticleDOI
The impact of silica nanoparticles on the performance of polymer solution in presence of salts in polymer flooding for heavy oil recovery
TL;DR: In this paper, a series of polymer flooding experiments are performed in a quarter five-spot glass micromodel saturated with heavy oil, and the results showed that the oil recovery decreases by increasing the salt concentration during the polyacrylamide flooding whereas in case of flooding with suspension of silica nanoparticles in polyacanlide, decreasing rate in oil recovery is lower.
Journal ArticleDOI
Design of Aqueous Processed Thick LiFePO4 Composite Electrodes for High-Energy Lithium Battery
TL;DR: In this article, a small-amplitude oscillatory rheology is used to probe the microstructure present in aqueous composite electrode slurries for lithium batteries.
Book ChapterDOI
Interactions between colloidal particles and soluble polymers
TL;DR: In this article, the effects on the quiescent state of colloidal dispersions, that is, stabilization, flocculation, phase separation, and dynamics such as the rheology, are discussed.
References
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Journal ArticleDOI
Flow properties of coagulated colloidal suspensions: III. The elastic floc model
Bruce Firth,Robert J. Hunter +1 more
TL;DR: In this article, the viscous flow behavior of a colloidal sol can be described in terms of the various contributions to the energy dissipation during flow, and a satisfactory description of the known features of the basic shear diagram can be obtained by attributing most of the dissipation to two processes: (i) viscous flows of the suspension medium around the flocs, which are the basic flow units, and (ii) the energy involved in stretching the flos in order to break floc doublets apart so that the amount of structure in the system is
Journal ArticleDOI
Flow properties of coagulated colloidal suspensions
Bruce Firth,Robert J. Hunter +1 more
TL;DR: In this article, the flow properties of electrically charged, but unstable, colloidal sols are investigated in the light of three possible models, i.e., hard (nondeformable) floc, elastic floc and hard (non-nondefinite) particle model, and they are shown to provide a consistent physical interpretation of both the linear region of the flow curve and the Bingham yield value.
Journal ArticleDOI
Polymer adsorption and its effect on the stability of hydrophobic colloids. II. The flocculation process as studied with the silver iodide-polyvinyl alcohol system
G.J Fleer,J Lyklema +1 more
TL;DR: In this paper, it was shown that the extent of flocculation depends critically on the way of mixing of sol and polymers and that the better the polymeric flocculant, the less critical the mixing order.
Journal ArticleDOI
Flow properties of coagulated colloidal suspensions: II. Experimental properties of the flow curve parameters
TL;DR: In this paper, the relationship between the experimental flow parameters and the colloidal parameters (volume fraction, particle size, and interactive forces) is examined and ten such relationships can be used to test the validity of possible models of the flow of coagulated suspensions.
Journal ArticleDOI
Relation of particle size of colloidal silica to the amount of a cationic polymer required for flocculation and surface coverage
TL;DR: In this article, a study of the flocculation of colloidal silicas of known uniform particle sizes by a quaternary ammonium substituted methacrylate polymer, of which the cations are adsorbed on the anionic sites of the silica surface by ion exchange was conducted.
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