THERMAL PROPERTIES OF SILICA AEROGELS
Open accessAbstract
The extremely low density of aerogels drastically influences all thermal properties : Compared to vitreous silica, aerogels show enhanced radiative heat transfer ; the solid conduction is reduced by two to three orders of magnitude as can be predicted from the phonon diffusion model ; at low temperatures the specific heat capacity of aerogels is larger by at least a factor of 10 than for non-porous SiO2- glass. Heat transport in monolithic and granular aerogels is discussed with respect to gas pressure, temperature, boundary emissivity and external load.
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The soft vacuum region, from about 0.1 torr to 10 torr, is complex and difficult to model because all modes of heat transfer-solid conduction, radiation, gas conduction, and convection-can be significant contributors to the total heat flow.
“The soft vacuum region, from about 0.1 torr to 10 torr, is complex and difficult to model because all modes of heat transfer -solid conduction, radiation, gas conduction, and convection -are significant contributors to the total heat flow.”
From Thermal conductivity of aerogel blanket insulation under cryogenic-vacuum conditions in different gas environments (2017) · cites this paper as [3]
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Fesmire, J. E., Ancipink, J. B., Swanger, A. M., White, S., & Yarbrough, D. (2017) · IOP Conference Series: Materials Science and Engineering · doi:10.1088/1757-899x/278/1/012198 · Cited by 18 · see citing works
- Authors
- FRICKE, J., HÜMMER, E., MORPER, H.-J., & SCHEUERPFLUG, P.
- Affiliations
- University of Würzburg (DE)
- ORCID
- FRICKE, J.
- Venue
- Le Journal de Physique Colloques
- Publisher
- EDP Sciences
- Published
- 1989-04
- Volume
- 24
- Issue
- C4
- Pages
- C4-87-C4-97
- ISSN
- 0449-1947 (ISSN-L)
- OpenAlex
- W2065699364
- Cited by
- 43
- References
- 0
- Citations by year
- 2024: 3 · 2023: 1 · 2022: 2 · 2021: 7 · 2020: 3 · 2019: 1 · 2018: 3 · 2017: 4 · 2016: 1 · 2015: 2 · 2014: 4 · 2013: 1 · 2012: 2
- FWCI
- 0.55
- Type
- journal article
- Language
- fr
- Open access
- green
- hal.science
- Licence
- other-oa
- Locations
- Le Journal de Physique Colloques (publishedVersion)
- HAL (submittedVersion, other-oa)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Aerogels and thermal insulation
- Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
- Physical Sciences › Materials Science › Ceramics and Composites › Glass properties and applications
- Keywords
- silica aerogel, thermal properties, radiative transfer, thermal conductivity, specific heat, low-density materials, heat transport, monolithic aerogels, gas pressure effects, porous silica glass
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