Hierarchically ordered foams derived from polysiloxanes with catalytically active coatings

Adam, Michael; Kocanis, Stella; Fey, Tobias; Wilhelm, Michaela; Grathwohl, Georg

doi:10.1016/j.jeurceramsoc.2013.12.011

Cited by 35 publications

(35 citation statements)

References 37 publications

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“…As seen from the TGA in Figure , APTES in 1MK‐1APTES‐200 underwent significant decomposition at 600°C, producing hydrophilic SiO 2 nano‐domains and the resultant MK‐APTES‐600 displayed considerable hydrophilicity. Another advantage of cross‐linking MK with APTES is that APTES has a potential use for helping with dispersion of metal ions to produce catalytic centers in the matrix …”

Section: Discussionmentioning

confidence: 99%

“…Another advantage of crosslinking MK with APTES is that APTES has a potential use for helping with dispersion of metal ions to produce catalytic centers in the matrix. 25…”

Section: Modification Of Surface Characteristics Of Fillersmentioning

confidence: 99%

“…Meso/macroporous SiOC monoliths were obtained by embedding periodic mesoporous organosilica particles into foamed siloxane preceramic polymer . Micro/macropore SiOC monoliths have been prepared by adding polymer‐derived fillers and controllable pyrolysis by direct foaming and sacrificial templating …”

Section: Introductionmentioning

confidence: 99%

“…22 Micro/macropore SiOC monoliths have been prepared by adding polymer-derived fillers and controllable pyrolysis by direct foaming and sacrificial templating. [23][24][25] Inorganic powders, mainly (Al 2 O 3 , ZrO 2, SiC, Si 3 N 4 etc. ), have been mixed with water, camphene, or tert-butyl alcohol to form stable suspensions for freeze casting to produce macroporous monoliths.…”

Section: Introductionmentioning

confidence: 99%

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Water‐based freeze casting: Adjusting hydrophobic polymethylsiloxane for obtaining hierarchically ordered porous SiOC

et al. 2017

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The hydrophobic properties of methyl poly siloxane (MK) were pushed into the “hydrophilic” range by cross‐linking it with (3‐aminopropyl)triethoxysilane (APTES) and subsequent pyrolysis to enable water‐based freeze casting. Filler properties are investigated by varying the ratios of MK to APTES (1:1, 1:2, 1:3, 1:4, 1:5), and pyrolysis temperatures (400°C, 500°C, 600°C) for the purpose of determining an optimal set of characteristics for freeze casting. Additionally, filler selection for this purpose is facilitated by analysis of zeta potential values and vapor adsorption. It was found that water‐based freeze casting with hybrid fillers, followed by a pyrolysis step (600°C‐700°C), leads to a SiOC ceramic monolith with a lamellar pore morphology and a hierarchically ordered micro/meso/macropore structure. Samples pyrolyzed at 1000°C contain mesopores, having a SSA as high as 51.6 m2/g. The hierarchically porous structure is very promising for applications involving gas or liquid transportation.

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Section: Discussionmentioning

confidence: 99%

“…Another advantage of crosslinking MK with APTES is that APTES has a potential use for helping with dispersion of metal ions to produce catalytic centers in the matrix. 25…”

Section: Modification Of Surface Characteristics Of Fillersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Water‐based freeze casting: Adjusting hydrophobic polymethylsiloxane for obtaining hierarchically ordered porous SiOC

et al. 2017

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“…This process predominantly yields open-cell structures with a high pore connectivity. Slurries of preceramic polymers with active or inert fillers are widely used for the impregnation of polymer preforms to form ceramic foams (Adam et al 2014;Krishnan et al 2014;Ceron-Nicolat et al 2010;de Sousa et al 2008). …”

Section: Porous and Cellular Ceramicsmentioning

confidence: 99%

Ceramics for Sustainable Energy Technologies with a Focus on Polymer-Derived Ceramics

Konegger

Torrey

Flores

et al. 2014

Novel Combustion Concepts for Sustainable Energy Development

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Due to their high hardness, high temperature stability, and high chemical stability, ceramic materials have significant uses and potential in existing and emerging sustainable technologies. In this paper, we provide a thorough overview of ceramics in a variety of sustainable applications. This is followed by a detailed discussion of an emerging process to make ceramics called polymer (or precursor)-derived ceramics. It is shown that due to the versatility of this process in making a wide range of shapes-fibers, coatings, and porous ceramics, this is an attractive route to make ceramics that will be a critical element in the next generation of sustainable technologies.

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Stereolithography of SiOC Polymer‐Derived Ceramics Filled with SiC Micronwhiskers

et al. 2018

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Due to complicated manufacturing methods and lack of machinability, the use of engineering ceramics is limited by the manufacturing processes used to fabricate parts with intricate geometries. The 3D printing of polymers that can be pyrolyzed into functional ceramics has recently been used to significantly expand the range of geometries that can be manufactured, but large shrinkage during pyrolysis has the potential to lead to cracking. In this work, a method to additively manufacture particle‐reinforced ceramic matrix composites is described. Specifically, stereolithography is used to crosslink a resin comprised of acrylate and vinyl‐functionalized siloxane oligomers with dispersed SiC whiskers. After crosslinking, the part is pyrolyzed to amorphous SiOC while the SiC whiskers remain unaffected. Composite ceramics shrink 37% while unreinforced parts shrink 42%; this significant reduction in shrinkage improves part stability. Importantly, these ceramic matrix composites contain no visible porosity nor cracking on the microstructural level. With the introduction of SiC, hardness increases from 10.8 to 12.1 GPa and density decreases from 2.99 to 2.86 g cm−3. Finally, printed ceramic porous structures, gears, and components for turbine blades are demonstrated. Applying stereolithographic techniques to ceramic matrix composites, this work may improve processing and properties of ceramics for applications that require complex geometries.

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Hierarchically ordered foams derived from polysiloxanes with catalytically active coatings

Cited by 35 publications

References 37 publications

Water‐based freeze casting: Adjusting hydrophobic polymethylsiloxane for obtaining hierarchically ordered porous SiOC

Water‐based freeze casting: Adjusting hydrophobic polymethylsiloxane for obtaining hierarchically ordered porous SiOC

Ceramics for Sustainable Energy Technologies with a Focus on Polymer-Derived Ceramics

Stereolithography of SiOC Polymer‐Derived Ceramics Filled with SiC Micronwhiskers

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