Compressive Strength and Capillary Pressure: Competing Properties of Particulate Suspensions that Determine the Onset of Desaturation

Stickland, Anthony D.; Teo, Hui-En; Franks, George V.; Scales, Peter J.

doi:10.1080/07373937.2014.915218

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…p y (f) and p max cap ðfÞ are both pressure terms that are functions of solids concentration. p y (f) is zero at f g and is typically described by a power-law of order 5 whereas p max cap ðfÞ starts at the origin and increases approximately linearly with f. The two functions intercept at a critical concentration f cap , which corresponds to the breakthrough pressure p b (Brown et al, 2002;Stickland et al, 2010Stickland et al, , 2014:…”

Section: Consolidation During Vacuum Filtrationmentioning

confidence: 98%

Compressional rheology: A tool for understanding compressibility effects in sludge dewatering

Stickland

2015

Water Research

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Section: Consolidation During Vacuum Filtrationmentioning

confidence: 98%

Compressional rheology: A tool for understanding compressibility effects in sludge dewatering

Stickland

2015

Water Research

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“…The particle concentration increases as liquid evaporates and the particle concentration is uniform throughout the drying body. Eventually the particle volume fraction is increased to the gel point (Φ g ) such that a three‐dimensional touching particle network forms signaling the start of the second stage of drying. The touching particle network develops a finite compressive yield stress that increases as drying continues because the volume fraction of the suspension increases.…”

Section: Drying and Crackingmentioning

confidence: 99%

Colloidal processing: enabling complex shaped ceramics with unique multiscale structures

et al. 2017

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Colloidal processing of fine ceramic powders enables the production of complex shaped ceramics with unique micro and macro structures which are not possible to produce via conventional dry processing routes. Because of this enhanced structural control and shaping capabilities, colloidal processing has been exploited to produce ceramic components with ever increasing complexity and functionalities. In this review, we revisit some of the research efforts on this topic to highlight its relevance and growing importance for the advanced manufacturing of functional ceramics. Selected examples of colloidal systems with increasing level of complexity are discussed to showcase the wide range of structures that can be generated through wet processing approaches. The historical development and background knowledge pertaining to colloids and surface interactions is first briefly reviewed. The major colloidal shape forming and additive manufacturing processes that utilize colloidal pastes and inks are then reviewed, highlighting the control of suspension rheology needed in these techniques. Next, methodologies that combine suspended particles with a pore‐forming phase are discussed as a means to produce porous ceramic materials. Further control over the interactions between anisotropic particles and their alignment in suspensions can be gained via externally applied fields (such as magnetic) to produce texturally aligned green bodies. This leads to bioinspired ceramics that can programmably morph into complex shaped objects upon sintering. Hierarchical porous structures with high mechanical efficiency are also shown as an example of the multiscale designs that can be generated through advanced colloidal processing. As drying of ceramic bodies is an inevitable consequence of wet colloidal processing, the current understanding of this critical processing step is reviewed. Finally, the gaps in knowledge in these fields are discussed to provide our perspective on where the field may support advances in ceramics in the future.

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“…Curved liquid menisci between the particles on the surface of the drying particulate material produce a compressive consolidation stress on the particle network 6,[15][16][17] . This causes the particle network to consolidate and increase its density.…”

Section: Introductionmentioning

confidence: 99%

Fracture toughness of wet and dry particulate materials comprised of colloidal sized particles: role of plastic deformation

Sesso

Franks

2017

Soft Matter

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This work demonstrates a method of measuring the fracture toughness of particulate materials comprised of colloidal sized particles over a wide range of saturation. Diametral compression of cylinders containing flaws of controlled length was used to measure the mode I fracture toughness. The effect of degree of saturation on the fracture toughness of slip cast ceramic grade alumina (d = 0.7 μm) was investigated. Dry powder compacts have significantly lower fracture toughness than when the powder compact is nearly fully saturated. All observations are consistent with the fracture mechanism being predominantly brittle for the dry samples but predominantly ductile in the nearly saturated samples. The additional dissipation that occurs during the ductile fracture of the nearly saturated samples is due to plastic deformation in front of the crack tip. This well-known mechanism for toughening in metals has been quantified for the first time in soft matter. Analysis of the results indicates that the size of the plastic dissipation zone is more than an order of magnitude larger in the nearly saturated materials compared to the dry material. Understanding the fracture mechanisms that control the propagation of cracks through saturated, partially saturated and dry particulate materials comprised of colloidal sized particles provides additional insight into understanding drying cracks in paint, other coatings, ceramics and water treatment sludge.

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Compressive Strength and Capillary Pressure: Competing Properties of Particulate Suspensions that Determine the Onset of Desaturation

Cited by 8 publications

References 24 publications

Compressional rheology: A tool for understanding compressibility effects in sludge dewatering

Compressional rheology: A tool for understanding compressibility effects in sludge dewatering

Colloidal processing: enabling complex shaped ceramics with unique multiscale structures

Fracture toughness of wet and dry particulate materials comprised of colloidal sized particles: role of plastic deformation

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