Physical and high-temperature permeation features of double-layered cellular filtering membranes prepared via freeze casting of emulsified powder suspensions

Barg, Suelen; Innocentini, M. D. M.; Meloni, R. V.; Chacon, Welton S.; Wang, Hai‐Ling; Koch, Dietmar; Grathwohl, Georg

doi:10.1016/j.memsci.2011.08.003

Cited by 40 publications

(24 citation statements)

References 18 publications

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“…Therefore, it appeared that the sintered SiC ceramics underwent mostly reversible structural changes at 650°C resulting in decrease in permeability constant k 2 . Similar effects have also been reported in the literature for hot gas filters and refractory castables …”

Section: Resultssupporting

confidence: 89%

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Evaluation of Air Permeation Behavior of Porous SiC Ceramics Synthesized by Oxidation‐Bonding Technique

Dey

Kayal

Chakrabarti

et al. 2012

Int J Applied Ceramic Tech

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Porous SiC ceramics were synthesized by oxidation bonding of compacts of commercial α‐SiC powder at 1300°C. Different volume fractions of petroleum coke powder were used for variation of porosity of ceramics from 36% to 56%. The material exhibited variations of pore size from 3 to 15 μm, flexural strength from 5.5 to 29.5 MPa, and elastic modulus from 3.3 to 27.6 GPa. Air permeation behavior was studied at 26–650°C. At room temperature Darcian (k1) and non‐Darcian (k2) permeability parameters vary from 1.64 to 18.42 × 10−13 m2 and 0.58 to 2.95 × 10−7 m, respectively. Temperature dependence of permeability was explained from structural changes occurring during test conditions.

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Section: Resultssupporting

confidence: 89%

“…The results show no meaningful change in k 1 and a slight decrease in k 2 . As the samples were previously sintered at 1300°C for 4 h, such changes up to 650°C were assumed to be mostly reversible and caused by thermal expansion effects …”

Section: Resultsmentioning

confidence: 99%

Evaluation of Air Permeation Behavior of Porous SiC Ceramics Synthesized by Oxidation‐Bonding Technique

Dey

Kayal

Chakrabarti

et al. 2012

Int J Applied Ceramic Tech

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“…Thanks to their unique combination of properties and functionalities (for example they can be light and strong), porous materials are used in many applications for engineering and medicine. From catalysis supports, filters, separation membranes, thermal insulators, reinforcement of composites to scaffolds for bone replacement [7][8][9]. However, shaping bulk materials in porous hierarchical structures with practical dimensions, controlled morphological features at multiple scale lengths and multifunctional properties, is still a challenge in materials science.…”

Section: Introductionmentioning

confidence: 99%

Complex ceramic architectures by directed assembly of ‘responsive’ particles

Garcı́a-Tuñón¹,

Machado²,

Schneider³

et al. 2017

Journal of the European Ceramic Society

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Surface functionalization of alumina powders with a responsive surfactant (BCS) leads to particles that react to a chemical switch. These 'responsive' building blocks are capable of assembling into macroscopic and complex ceramic structures. The aggregation follows a bottom up approach and can be easily controlled. The directed assembly of concentrated suspensions leads to highly dense (~99%) ceramic components with average 4-point bending strength of ~200 MPa. On the other hand, the emulsification of suspensions with concentrations from 7 to 43 vol% and 50 vol% decane results in emulsions with different properties (stability, droplet size and distribution). The oil droplets provide a soft template confining the alumina particles in the continuous phase and at the oil/water interfaces. Aggregation of these emulsions followed by drying and sintering leads to macroporous (pore sizes ranging from 30 to 4 µm) alumina structures with complex shapes and a wide range of microstructures, from closed cell structures to highly interconnected foams with total porosities up to 83%. Alumina scaffolds with ~55 % porosity can reach crushing strength values above 300 MPa in compression and ~50 MPa in 4-point bending.

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“…Changes in the processing variables can increase interconnected porosity and pore size or can decrease the tortuosity and the roughness of the pores. These changes will result in an increase in k 1 and k 2 , although the magnitudes of the changes will differ 18,[27][28][29] . Permeation is also highly susceptible to phenomena induced by the temperature during the processing of porous ceramic materials.…”

mentioning

confidence: 99%

“…These phenomena occur through a reduction in the number of voids (due to densification) or through the creation of new voids and interconnections due to stresses caused by thermal expansion (microcracks) or even by the expansive removal of volatile and organic compounds (debinding and dehydration). The extent of these structural modifications on the permeability coefficients can be easily evaluated via permeability tests at room temperature before and after the heat treatments 18,28 . Thus, this paper presents experimental results of permeability, porosity, and microstructure characterization related to the use of carbonates as pore-generating agents in different ceramic compositions.…”

mentioning

confidence: 99%

Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

et al. 2013

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The aim of this work was to experimentally evaluate the use of calcium carbonate as a poregenerating agent in ceramic compositions. Compositions that contained 50% kaolin, 20% limestone, and different concentrations of quartz and feldspar were prepared by uniaxial pressing. Samples were heat-treated at a heating rate appropriate to induce calcium carbonate degassing, and they were then sintered at 800, 900, and 1050 °C. Tests of X-ray fluorescence, thermogravimetric analysis, porosimetry, and air permeation were performed. The composition (wt%) that contained 50% kaolin, 20% limestone, 20% feldspar, and 10% quartz and heat treated at 1050 °C (k 1 = 1.73×10 -13 m 2 and k 2 = 1.00×10 -8 m) showed the highest level of permeability among the investigated samples. Fluid dynamics simulations showed that the prepared samples would exhibit a pressure drop greater than the range desired for applications that involve the filtration of aerosols, but alternatively would be suitable as substrates for asymmetric membranes in microfiltration applications.

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Physical and high-temperature permeation features of double-layered cellular filtering membranes prepared via freeze casting of emulsified powder suspensions

Cited by 40 publications

References 18 publications

Evaluation of Air Permeation Behavior of Porous SiC Ceramics Synthesized by Oxidation‐Bonding Technique

Evaluation of Air Permeation Behavior of Porous SiC Ceramics Synthesized by Oxidation‐Bonding Technique

Complex ceramic architectures by directed assembly of ‘responsive’ particles

Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

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