Cellular Ceramics by Direct Foaming of Emulsified Ceramic Powder Suspensions

Barg, Suelen; Soltmann, Christian; Andrade, M. S.; Koch, Dietmar; Grathwohl, Georg

doi:10.1111/j.1551-2916.2008.02553.x

Cited by 129 publications

(91 citation statements)

References 27 publications

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“…The pore size, according to International Union of Pure and Applied Chemistry (IUPAC) 2 can be classified as micro (<2 nm), meso (2-50 nm) or macropores (>50 nm). The distribution and amount of pores determine specific properties, such as low density and thermal conductivity, high surface area, permeability and chemical and thermal stability 1,4,5 . Furthermore, glass foams have mechanical strength and chemical and thermal stabilities greater than the polymeric foams typically employed in such cases 1,6,7 .…”

Section: Introductionmentioning

confidence: 99%

Thermal Insulating Foams Produced From Glass Waste and Banana Leaves

et al. 2016

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In this work, compositions containing transparent glass bottles and banana leaves (desiccated and crushed), with different mass fractions (30-50%), were prepared for obtaining cellular materials for thermal insulation purposes. The formulated and prepared compositions were uniaxially pressed (10 MPa) and the compact powders fired between 700 and 850°C for 30 min in order to investigate the effect of the banana leaves on the formation of pores and on the thermal and mechanical properties of the processed glass foams. The results indicated that the obtained glass foams with porosities between 58.5 and 87.5%, compressive strength ranging between 1.17 and 3.50 MPa and thermal conductivity ranging between 0.06 and 0.15 W/mK, are potential candidates to work as thermal insulators with appropriate properties for a specific application.

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Section: Introductionmentioning

confidence: 99%

Thermal Insulating Foams Produced From Glass Waste and Banana Leaves

et al. 2016

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“…10), 11) The key aspects in this process are the stabilization and consolidation mechanisms. However, the ceramic/binder foam is a thermodynamically unstable system in which heat treatment (drying, debinding) and gas bubble coarsening can lead to foam degradation and final destruction.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of porous alumina with denser surface layer by direct foaming

Shimamura

Fukushima

Hotta

et al. 2017

J. Ceram. Soc. Japan

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Porous alumina with a denser surface layer is fabricated from an alumina/novolac composite body containing hexamethylenetetramine (HMT) that is used as a blowing agent and a curing agent for the novolac resin. A gas blown from HMT leads to the formation of pores up to submillimeter inside the alumina/novolac composite body. On the other hand, the denser surface layer without large pores is formed by the gas released from the surface during blowing. The blowing condition for the alumina/ novolac composite body is examined as a function of heat-treatment temperature in order to investigate the formation of the pore and the surface layer. Porous alumina with the denser surface layer is obtained through de-binding and sintering of the body. This paper also describes the microstructure and mechanical strength of the sintered porous alumina, and advantages of the denser surface layer.

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“…6 had adsorption achieved by ligand exchange, whereby a surface hydroxyl group is exchanged for another group. This occurred because of the Porous Ceramics http://dx.doi.org/10.5772/61047 63 favorable change in the surface charge by the removal of (OH 2 + ), a better leaving group, and replacement with (-OH) [44,45]. …”

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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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Cellular Ceramics by Direct Foaming of Emulsified Ceramic Powder Suspensions

Cited by 129 publications

References 27 publications

Thermal Insulating Foams Produced From Glass Waste and Banana Leaves

Thermal Insulating Foams Produced From Glass Waste and Banana Leaves

Fabrication and characterization of porous alumina with denser surface layer by direct foaming

Porous Ceramics

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