Journal ArticleDOI
Comparison of the Compressive Yield Response of Aggregated Suspensions: Pressure Filtration, Centrifugation, and Osmotic Consolidation
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TLDR
In this paper, the compressive yield stress of suspensions containing flocculated kaolin, alumina, and hydrous zirconia was measured using three different techniques: pressure filtration, volume fraction profile during centrifugation, and sediment height during spinning speeds.Abstract:
The compressive rheological responses of suspensions containing flocculated kaolin, alumina (average particle sizes of 0.2 and 0.5 {micro}m), and hydrous zirconia (average particle sizes of 8, 57, and 139 nm) particles have been measured using three different techniques: pressure filtration, volume fraction profile during centrifugation, and sediment height during centrifugation at multiple spinning speeds. While the volume fraction profile technique appears to be experimentally most robust, equivalent responses are found using the different techniques, indicating that the compressive yield stress is a material property of a given suspension. The compressive yield stress of each suspension increases rapidly with volume fraction but cannot be generally described using simple power-law or exponential fits. The compressive yield stress also increases with the inverse square of particle size. The packing behavior of the suspensions undergoing osmotic consolidation is compared with the mechanical compressive yield response. Some suspensions exhibited the same packing behavior as in the mechanical techniques, while others consistently packed to higher densities during osmotic consolidation. Although equivalent osmotic and mechanical loads do not always result in the same volume fractions, the similar increases in volume fraction with applied driving force suggest that both the osmotic and mechanical techniques are controlled by themore » force needed to rearrange the particle network.« lessread more
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Journal ArticleDOI
Dewatering properties of dual-polymer-flocculated systems
TL;DR: In this paper, the effect of dual-polymer flocculation on the compressive yield stress and hindered settling function of positively charged alumina suspensions as measured by a pressure filtration technique was examined.
Journal ArticleDOI
Mechanical behavior of saturated, consolidated, alumina powder compacts: effect of particle size and morphology on the plastic-to-brittle transition
George V. Franks,Fred F. Lange +1 more
TL;DR: In this paper, the effects of particle size and morphology on the mechanical behavior of pressure consolidated, saturated, alumina powder bodies, were determined with uniaxial compression experiments of cylindrical specimens at a fixed displacement rate.
Journal ArticleDOI
Characterisation of dewaterability from equilibrium and transient centrifugation test data
TL;DR: In this paper, the dewaterability of sedimentation data obtained in a laboratory centrifuge with interface height detection has been investigated and an algorithm for obtaining accurate results over a broad range of solids concentrations was proposed.
Journal ArticleDOI
Effect of coagulation conditions on the dewatering properties of sludges produced in drinking water treatment
TL;DR: In this paper, a range of water treatment sludges generated in the laboratory were characterised according to a phenomenological method that is valid from the dilute free-settling regime to the concentrated cake compression stages.
Journal ArticleDOI
The transformation mechanism from suspension to green body and the development of colloidal forming
TL;DR: In this article, the authors reviewed the transformation mechanisms from suspension to green body and the development of colloidal forming, and the defects formation, inheritance and evolution during drying, de-binding and sintering processes.
References
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Journal ArticleDOI
The Osmotic Potential of Polyethylene Glycol 6000
TL;DR: Osmotic potential (psi(s)) of aqueous solutions of polyethylene glycol 6000 (PEG-6000) was curvilinearly related to concentration and increased linearly with temperature.
Journal ArticleDOI
Evaluation of the water potentials of solutions of polyethylene glycol 8000 both in the absence and presence of other solutes.
TL;DR: Published and additional data for polyethylene glycol 8000 (PEG), formerly PEG 6000, solution water potentials (Psi), and results indicate that the coefficients are not virial.
Book ChapterDOI
Osmotic stress for the direct measurement of intermolecular forces.
TL;DR: The OS measurement of forces between DNA double helices demonstrates the utility of the method for examining an entire class of linear macromolecules, such as collagen triple helices and xanthan polysaccharides.
Journal ArticleDOI
Refinement of theαAl2O3, Ti2O3, V2O3and Cr2O3structures*
R. E. Newnham,Y. M. de Haan +1 more
Journal ArticleDOI
The consolidation of concentrated suspensions. Part 1.—The theory of sedimentation
Richard Buscall,Lee R. White +1 more
TL;DR: In this paper, the concentration or consolidation of suspensions of fine particles under the influence of a gravitational field has been analyzed and a constitutive equation is suggested for irreversibly flocculated suspensions undergoing consolidation which embodies the concept of a concentration-dependent yield stress Py(ϕ).
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