Macroporous Ceramics from Particle‐stabilized Emulsions

Akartuna, Ilke; Studart, André R.; Tervoort, Elena; Gauckler, Ludwig J.

doi:10.1002/adma.200801888

Cited by 141 publications

(122 citation statements)

References 24 publications

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“…The coated, hydrophobic particles irreversibly adsorb to the air-water interface, thus stabilizing it (Figs. 2(c) and 3) [38]. These wet foams can remain stable for several days and show no bubble coarsening, drainage, or creaming.…”

Section: Direct Foamingmentioning

confidence: 98%

Porous Ceramics

Sarkar¹,

Kim²

2015

Advanced Ceramic Processing

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The unique chemical composition and microstructure of porous ceramics enable the ceramic products used in a number of applications such as filtration of molten metals and hot corrosive gases, high-temperature thermal insulation, support for catalytic reactions, filtration of diesel engine exhaust gases, etc. These applications take advantage of special characteristics of porous ceramics such as low thermal mass, low thermal conductivity, controlled permeability, high surface area, low density, and high specific strength. In this chapter, we emphasize on direct foaming method, a simple and versatile approach that allows fabrication of porous ceramics with tailored microstructure along with distinctive properties. Foam stability is achieved upon controlled addition of amphiphiles to the colloidal suspension, which induce in situ hydrophobization, allowing the wet foam to resist coarsening upon drying and sintering.

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Section: Direct Foamingmentioning

confidence: 98%

Porous Ceramics

Sarkar¹,

Kim²

2015

Advanced Ceramic Processing

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“…Such wet emulsions can be shaped, extruded into forms or coated into sheets because of their measurable yield stress Chen et al, 2012). Once dried, the resulting highly porous green ceramics can be sintered, creating a ceramic foam with open cell microstructure and compressive strengths up to 13 MPa and porosities above 70 vol% (Akartuna et al, 2008a).…”

Section: Introductionmentioning

confidence: 99%

New composite separator pellet to increase power density and reduce size of thermal batteries

Mondy

Roberts

Grillet

et al. 2013

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We show that it is possible to manufacture strong macroporous ceramic films that can be backfilled with electrolyte to form rigid separator pellets suitable for use in thermal batteries. Several new ceramic manufacturing processes are developed to produce sintered magnesium oxide foams with connected porosities of over 80% by volume and with sufficient strength to withstand the battery manufacturing steps. The effects of processing parameters are quantified, and methods to imbibe electrolyte into the ceramic scaffold demonstrated. Preliminary single cell battery testing show that some of our first generation pellets exhibit longer voltage life with comparable resistance at the critical early times to that exhibited by a traditional pressed pellets. Although more development work is needed to optimize the processes to create these rigid separator pellets, the results indicate the potential of such ceramic separator pellets to be equal, if not superior to, current pressed pellets. Furthermore, they could be a replacement for critical material that is no longer available, as well as improving battery separator strength, decreasing production costs, and leading to shorter battery stacks for long-life batteries. 4

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“…[13,14] Encouraging progress has been made in the control of the size, shape, and uniformity of the pores in porous materials over the years. [15][16][17] However, it remains challenging to control the open-pore fraction in cellular metals. Furthermore, once a metal foam is produced, it is no longer possible to alter the pore morphology and the relative proportion of the open or closed pores.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Porous Aluminum with Controllable Open-Pore Fraction

Yan

Schaffer

Qian

2011

Metall Mater Trans A

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Aluminum with an open-pore structure was fabricated through nitridation of an AA6061-2 pct Mg-1 pct Sn powder mixture, where interconnected permeable AlN shells developed on each AA6061 particle and imparted strength to the assembly. The resulting intershell spaces form an open-pore structure. When such an open-pore structure is heated above the liquidus of the core, an open-closed pore transformation occurs, where the molten core in each shell spontaneously migrates to fill the open pores outside, leaving a closed pore inside each shell. Based on this finding, porous AA6061 with different open-pore fractions was fabricated by heating open-pore structures of AA6061 into the semisolid region, where the liquid fraction changes with temperature. The mechanism for the open-closed pore transformation is identified through detailed microstructural and thermodynamic analyses. Criteria for the open-closed pore transformation are specified. Additionally, net shape fabrication of porous aluminum with controlled pore features is realized using the novel concept.

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Macroporous Ceramics from Particle‐stabilized Emulsions

Cited by 141 publications

References 24 publications

Porous Ceramics

Porous Ceramics

New composite separator pellet to increase power density and reduce size of thermal batteries

Fabrication of Porous Aluminum with Controllable Open-Pore Fraction

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