A review of fabrication strategies and applications of porous ceramics prepared by freeze-casting method

Liu, Ruiping; Xu, Tingting; Wang, Chang‐An

doi:10.1016/j.ceramint.2015.10.148

Cited by 202 publications

(110 citation statements)

References 120 publications

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“…The samples with a complexing group to Ni ratio of Figure A‐D exhibit a prismatic like pore morphology with a pronounced orientation of the pore channels in radial direction. Orientation of the pores originates from the direction of freezing since the solvent crystals grow in the direction of heat transfer . Additionally, Hg intrusion measurements reveal mean pore window diameters of 8.2‐15.1 µm as it can be seen in Figure .…”

Section: Resultsmentioning

confidence: 89%

Porous SiOC monoliths with catalytic activity by in situ formation of Ni nanoparticles in solution‐based freeze casting

2020

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Micro‐ and macroporous monoliths with in situ formed nickel nanoparticles were prepared for the first time by the combination of solution‐based freeze casting and preceramic polymers (methyl polysiloxane). This one‐step process results in macroporous monoliths composed of microporous and catalytic active nickel‐containing polymer‐derived ceramic. Four different complexing and cross‐linking siloxanes with amino functionality were screened for their ability to create small nickel particles. TEM analysis confirmed 3‐aminopropyltriethoxysilane being most efficient. High BET‐specific surface areas of 344‐461 m2 g−1 were achieved. Increased ratio of complexing groups to nickel improves the dispersion of nickel to (3.61 ± 1.49) nm. The nickel size dependence of conversion (maximum 0.49) and CH4 selectivity (maximum 0.74) in CO2 methanation emphasizes the importance of controlling the nickel size. The hydrophobic surface characteristic is hypothesized to be the main reason polymer‐derived catalysts having better catalytic activity compared with nickel‐impregnated silica. The promising catalytic activity combined with the versatile freeze casting process can prospectively address heat‐ and mass‐transfer considerations in heterogeneous monolith catalysis.

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Section: Resultsmentioning

confidence: 89%

Porous SiOC monoliths with catalytic activity by in situ formation of Ni nanoparticles in solution‐based freeze casting

2020

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“…This study revealed that the microstructure and mechanical properties of porous WS 2 scaffolds prepared by freeze casting method can be well adjusted by changing the gelatin concentrations in the slurry and cooling temperature, the following points can be concluded: (1) As increasing the addition of gelatin, the pore size and porosity of porous WS 2 scaffolds were decreased, and the large and lamellar pores were changed into small and reticulated pores. With the gelatin concentration increasing from 2 to 5 wt%, the compressive strength of porous WS 2 ceramics increased from 0.22 to 1.16 MPa.…”

Section: Discussionmentioning

confidence: 94%

Control of the structure and mechanical property of porous WS2 scaffold during freeze casting

Luo

Liu

et al. 2017

J Porous Mater

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“…Porous ceramics, which have outstanding properties, such as excellent corrosion resistance, good structural stability and high hardness, are extensively used in various fields, such as filtration, catalysis and environmental protection [1,2,3,4]. Traditionally, ceramics have intrinsic disadvantages, for instance high brittleness, poor machinability and low conductivity, which limit their potential applications [5,6].…”

Section: Introductionmentioning

confidence: 99%

Pore Formation Process of Porous Ti3SiC2 Fabricated by Reactive Sintering

2017

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Porous Ti3SiC2 was fabricated with high purity, 99.4 vol %, through reactive sintering of titanium hydride (TiH2), silicon (Si) and graphite (C) elemental powders. The reaction procedures and the pore structure evolution during the sintering process were systematically studied by X-ray diffraction (XRD) and scanning electron microscope (SEM). Our results show that the formation of Ti3SiC2 from TiH2/Si/C powders experienced the following steps: firstly, TiH2 decomposed into Ti; secondly, TiC and Ti5Si3 intermediate phases were generated; finally, Ti3SiC2 was produced through the reaction of TiC, Ti5Si3 and Si. The pores formed in the synthesis procedure of porous Ti3SiC2 ceramics are derived from the following aspects: interstitial pores left during the pressing procedure; pores formed because of the TiH2 decomposition; pores formed through the reactions between Ti and Si and Ti and C powders; and the pores produced accompanying the final phase synthesized during the high temperature sintering process.

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A review of fabrication strategies and applications of porous ceramics prepared by freeze-casting method

Cited by 202 publications

References 120 publications

Porous SiOC monoliths with catalytic activity by in situ formation of Ni nanoparticles in solution‐based freeze casting

Porous SiOC monoliths with catalytic activity by in situ formation of Ni nanoparticles in solution‐based freeze casting

Control of the structure and mechanical property of porous WS2 scaffold during freeze casting

Pore Formation Process of Porous Ti3SiC2 Fabricated by Reactive Sintering

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