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Hypocrystalline ceramic aerogels for thermal insulation at extreme conditions
Thermal insulation under extreme conditions requires materials that can withstand complex thermomechanical stress and retain excellent thermal insulation properties at temperatures exceeding 1,000 degrees Celsius(1–3). Ceramic aerogels are attractive thermal insulating materials; however, at very hi...
Autores principales: | , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9242853/ https://www.ncbi.nlm.nih.gov/pubmed/35768591 http://dx.doi.org/10.1038/s41586-022-04784-0 |
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author | Guo, Jingran Fu, Shubin Deng, Yuanpeng Xu, Xiang Laima, Shujin Liu, Dizhou Zhang, Pengyu Zhou, Jian Zhao, Han Yu, Hongxuan Dang, Shixuan Zhang, Jianing Zhao, Yingde Li, Hui Duan, Xiangfeng |
author_facet | Guo, Jingran Fu, Shubin Deng, Yuanpeng Xu, Xiang Laima, Shujin Liu, Dizhou Zhang, Pengyu Zhou, Jian Zhao, Han Yu, Hongxuan Dang, Shixuan Zhang, Jianing Zhao, Yingde Li, Hui Duan, Xiangfeng |
author_sort | Guo, Jingran |
collection | PubMed |
description | Thermal insulation under extreme conditions requires materials that can withstand complex thermomechanical stress and retain excellent thermal insulation properties at temperatures exceeding 1,000 degrees Celsius(1–3). Ceramic aerogels are attractive thermal insulating materials; however, at very high temperatures, they often show considerably increased thermal conductivity and limited thermomechanical stability that can lead to catastrophic failure(4–6). Here we report a multiscale design of hypocrystalline zircon nanofibrous aerogels with a zig-zag architecture that leads to exceptional thermomechanical stability and ultralow thermal conductivity at high temperatures. The aerogels show a near-zero Poisson’s ratio (3.3 × 10(−4)) and a near-zero thermal expansion coefficient (1.2 × 10(−7) per degree Celsius), which ensures excellent structural flexibility and thermomechanical properties. They show high thermal stability with ultralow strength degradation (less than 1 per cent) after sharp thermal shocks, and a high working temperature (up to 1,300 degrees Celsius). By deliberately entrapping residue carbon species in the constituent hypocrystalline zircon fibres, we substantially reduce the thermal radiation heat transfer and achieve one of the lowest high-temperature thermal conductivities among ceramic aerogels so far—104 milliwatts per metre per kelvin at 1,000 degrees Celsius. The combined thermomechanical and thermal insulating properties offer an attractive material system for robust thermal insulation under extreme conditions. |
format | Online Article Text |
id | pubmed-9242853 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-92428532022-07-01 Hypocrystalline ceramic aerogels for thermal insulation at extreme conditions Guo, Jingran Fu, Shubin Deng, Yuanpeng Xu, Xiang Laima, Shujin Liu, Dizhou Zhang, Pengyu Zhou, Jian Zhao, Han Yu, Hongxuan Dang, Shixuan Zhang, Jianing Zhao, Yingde Li, Hui Duan, Xiangfeng Nature Article Thermal insulation under extreme conditions requires materials that can withstand complex thermomechanical stress and retain excellent thermal insulation properties at temperatures exceeding 1,000 degrees Celsius(1–3). Ceramic aerogels are attractive thermal insulating materials; however, at very high temperatures, they often show considerably increased thermal conductivity and limited thermomechanical stability that can lead to catastrophic failure(4–6). Here we report a multiscale design of hypocrystalline zircon nanofibrous aerogels with a zig-zag architecture that leads to exceptional thermomechanical stability and ultralow thermal conductivity at high temperatures. The aerogels show a near-zero Poisson’s ratio (3.3 × 10(−4)) and a near-zero thermal expansion coefficient (1.2 × 10(−7) per degree Celsius), which ensures excellent structural flexibility and thermomechanical properties. They show high thermal stability with ultralow strength degradation (less than 1 per cent) after sharp thermal shocks, and a high working temperature (up to 1,300 degrees Celsius). By deliberately entrapping residue carbon species in the constituent hypocrystalline zircon fibres, we substantially reduce the thermal radiation heat transfer and achieve one of the lowest high-temperature thermal conductivities among ceramic aerogels so far—104 milliwatts per metre per kelvin at 1,000 degrees Celsius. The combined thermomechanical and thermal insulating properties offer an attractive material system for robust thermal insulation under extreme conditions. Nature Publishing Group UK 2022-06-29 2022 /pmc/articles/PMC9242853/ /pubmed/35768591 http://dx.doi.org/10.1038/s41586-022-04784-0 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Guo, Jingran Fu, Shubin Deng, Yuanpeng Xu, Xiang Laima, Shujin Liu, Dizhou Zhang, Pengyu Zhou, Jian Zhao, Han Yu, Hongxuan Dang, Shixuan Zhang, Jianing Zhao, Yingde Li, Hui Duan, Xiangfeng Hypocrystalline ceramic aerogels for thermal insulation at extreme conditions |
title | Hypocrystalline ceramic aerogels for thermal insulation at extreme conditions |
title_full | Hypocrystalline ceramic aerogels for thermal insulation at extreme conditions |
title_fullStr | Hypocrystalline ceramic aerogels for thermal insulation at extreme conditions |
title_full_unstemmed | Hypocrystalline ceramic aerogels for thermal insulation at extreme conditions |
title_short | Hypocrystalline ceramic aerogels for thermal insulation at extreme conditions |
title_sort | hypocrystalline ceramic aerogels for thermal insulation at extreme conditions |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9242853/ https://www.ncbi.nlm.nih.gov/pubmed/35768591 http://dx.doi.org/10.1038/s41586-022-04784-0 |
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