Direct foaming driven synthesis and thermophysical characterization of silica-alumina foams: Applications for thermal insulation

Rao, Pratish; Muralidharan, Krishna; Momayez, Moe; Runge, Keith; Loy, Douglas A.

doi:10.1016/j.ceramint.2020.01.042

Cited by 12 publications

(4 citation statements)

References 26 publications

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“…Indeed, Feng et al presented a study using hydrogen peroxide in order to create porosity in geopolymers (figure 3). 47 Moreover, other teams showed interest in geopolymers blown with H 2 O 2 as Petlichkaia et al 48 Recently Rao et al 49 presented a silica-alumina foam blown using hydrogen peroxide. Thus, gas production requires harsh conditions such as oxidizing agent and alkaline system that are not suitable for polymers and this blowing agent is limited to inorganic foams.…”

Section: ) Hydrogen Peroxidementioning

confidence: 99%

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From gas release to foam synthesis, the second breath of blowing agents

Coste

Négrell

Caillol

2020

European Polymer Journal

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The increasing concern about the environmental impact of physical blowing agents (PBAs) favours the use of chemical blowing agents (CBAs) to replace controversial PBAs. Blowing agents are key compounds in order to obtain polymer foams. Indeed, blowing agents are crucial additives that release gas needed to blow polymer foams. CBA compounds have been widely studied in recent decades, and today if new CBA are studied, one of the challenges remains to adapt the use of CBA to new polymers or new formulations. Only a handful of books present different CBAs commercially available but in these documents, the presentation of CBAs is not enough complete to understand potential or limits. Thus, our work is focused on the most common, both inorganic and organic chemical blowing agents and highlights the specifications of these CBAs, with their advantages and drawbacks, and finally presents promising perspectives.

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Section: ) Hydrogen Peroxidementioning

confidence: 99%

“…The reaction between hydrides and water is still in development in academic and industrial research teams but the focus is not necessary on foaming process. [47][48][49] Hydrides 650 H 2 -Metallic foams [50][51][52] (Al, Zn, Tin, etc. )…”

Section: Scheme 4: Reaction Between Magnesium Hydride and Watermentioning

confidence: 99%

From gas release to foam synthesis, the second breath of blowing agents

Coste

Négrell

Caillol

2020

European Polymer Journal

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“…Of these, direct foaming is most commonly applied; here foaming agents such as Al, SiC, Si, NaOCl, FeSi alloys, NaBO 3 , or H 2 O 2 are added to the alkali-activated slurry to trigger a chemical reaction which releases gaseous products. The gasses are trapped in the material's structure during hardening which results in a highly porous material [5,6]. Surfactants or stabilizing agents such as sodium oleate, sodium dodecyl sulfate, triton, or stearic acid are added to the slurry to stabilize the pores and control their size [7,8].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of Alkali-Activated Composites of Lightweight Aggregates (LWAs) Embedded in Alkali-Activated Foam (AAF) Matrices

et al. 2022

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Alkali-activated composites of lightweight aggregates (LWAs, with beneficial insulating properties) and alkali-activated foams (AAFs, higher added value products due to their production from waste materials at well below 100 °C) allow for the expectation of superior properties if a chemical bonding reaction or mechanical interlocking occurs during production. However, the interfaces between LWAs and an AAF have not been studied in detail so far. Chemical reactions are possible if the LWA contains an amorphous phase which can react with the alkaline activators of the AAF, increase the bonding, and thus, also their mechanical strengths. These, in turn, allow for an improvement of the thermal insulation properties as they enable a further density reduction by incorporating low density aggregates. This work features a first-detailed analyses of the interfaces between the LWAs’ expanded polystyrene, perlite, expanded clay and expanded glass, and the alkali-activated foam matrices produced using industrial slags and fly ash. Some are additionally reinforced by fibers. The goal of these materials is to replace cement by alkali-activated waste as it significantly lowers the environmental impact of the produced building components.

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“…8,9 In spite of the fact that the direct preparation of auxetic foams from polymer resins is still a challenge, several recent research works have successfully produced these foams through a direct synthesizing process. 12,13 Fibers and yarns are the basic components of textile materials. The successful fabrication of auxetic fibers from polymers significantly enlarges the potential applications of auxetic polymeric materials.…”

mentioning

confidence: 99%

Auxetic materials and structures for potential defense applications: An overview and recent developments

Nguyễn,

Fangueiro,

Ferreira

et al. 2023

Textile Research Journal

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Auxetic behavior is a promising new area for use in defense applications. In comparison to a conventional material, an auxetic material has superior properties because of having a negative Poisson’s ratio; it gets broadened when stretched or becomes smaller when compressed. Furthermore, auxetic materials have enhanced properties such as shear resistance, indentation resistance, fracture toughness, energy absorption, and so on. These improved properties make auxetic materials very appealing and have the potential to revolutionize their applications in aerospace, sports, automotive, construction, biomedical engineering, smart sensors, packaging, cushioning, air filtration, shock absorption and sound insulation, and defense personal protective equipment. This article examines the most recent scientific advances in auxetic materials and structures, such as auxetic textiles (fibers, yarns, and fabrics), auxetic textile-reinforced composites, and auxetic foams, as well as their exceptional auxetic behavior and various approaches to achieving them. Although many potential applications have been proposed, actual applications of auxetic materials in defense are still limited. This is an in-depth review article, and its main goal is to serve as a foundation for future studies concerning the topic.

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Direct foaming driven synthesis and thermophysical characterization of silica-alumina foams: Applications for thermal insulation

Cited by 12 publications

References 26 publications

From gas release to foam synthesis, the second breath of blowing agents

From gas release to foam synthesis, the second breath of blowing agents

Microstructural Characterization of Alkali-Activated Composites of Lightweight Aggregates (LWAs) Embedded in Alkali-Activated Foam (AAF) Matrices

Auxetic materials and structures for potential defense applications: An overview and recent developments

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