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Anisotropic and hierarchical SiC@SiO(2) nanowire aerogel with exceptional stiffness and stability for thermal superinsulation
Ceramic aerogels are promising lightweight and high-efficient thermal insulators for applications in buildings, industry, and aerospace vehicles but are usually limited by their brittleness and structural collapse at high temperatures. In recent years, fabricating nanostructure-based ultralight mate...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7314525/ https://www.ncbi.nlm.nih.gov/pubmed/32637589 http://dx.doi.org/10.1126/sciadv.aay6689 |
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author | Su, Lei Wang, Hongjie Niu, Min Dai, Sheng Cai, Zhixin Yang, Biguo Huyan, Huaixun Pan, Xiaoqing |
author_facet | Su, Lei Wang, Hongjie Niu, Min Dai, Sheng Cai, Zhixin Yang, Biguo Huyan, Huaixun Pan, Xiaoqing |
author_sort | Su, Lei |
collection | PubMed |
description | Ceramic aerogels are promising lightweight and high-efficient thermal insulators for applications in buildings, industry, and aerospace vehicles but are usually limited by their brittleness and structural collapse at high temperatures. In recent years, fabricating nanostructure-based ultralight materials has been proved to be an effective way to realize the resilience of ceramic aerogels. However, the randomly distributed macroscale pores in these architectures usually lead to low stiffness and reduced thermal insulation performance. Here, to overcome these obstacles, a SiC@SiO(2) nanowire aerogel with a nanowire-assembled anisotropic and hierarchical microstructure was prepared by using directional freeze casting and subsequent heat treatment. The aerogel exhibits an ultralow thermal conductivity of ~14 mW/m·K, an exceptional high stiffness (a specific modulus of ~24.7 kN·m/kg), and excellent thermal and chemical stabilities even under heating at 1200°C by a butane blow torch, which makes it an ideal thermally superinsulating material for applications under extreme conditions. |
format | Online Article Text |
id | pubmed-7314525 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-73145252020-07-06 Anisotropic and hierarchical SiC@SiO(2) nanowire aerogel with exceptional stiffness and stability for thermal superinsulation Su, Lei Wang, Hongjie Niu, Min Dai, Sheng Cai, Zhixin Yang, Biguo Huyan, Huaixun Pan, Xiaoqing Sci Adv Research Articles Ceramic aerogels are promising lightweight and high-efficient thermal insulators for applications in buildings, industry, and aerospace vehicles but are usually limited by their brittleness and structural collapse at high temperatures. In recent years, fabricating nanostructure-based ultralight materials has been proved to be an effective way to realize the resilience of ceramic aerogels. However, the randomly distributed macroscale pores in these architectures usually lead to low stiffness and reduced thermal insulation performance. Here, to overcome these obstacles, a SiC@SiO(2) nanowire aerogel with a nanowire-assembled anisotropic and hierarchical microstructure was prepared by using directional freeze casting and subsequent heat treatment. The aerogel exhibits an ultralow thermal conductivity of ~14 mW/m·K, an exceptional high stiffness (a specific modulus of ~24.7 kN·m/kg), and excellent thermal and chemical stabilities even under heating at 1200°C by a butane blow torch, which makes it an ideal thermally superinsulating material for applications under extreme conditions. American Association for the Advancement of Science 2020-06-24 /pmc/articles/PMC7314525/ /pubmed/32637589 http://dx.doi.org/10.1126/sciadv.aay6689 Text en Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Su, Lei Wang, Hongjie Niu, Min Dai, Sheng Cai, Zhixin Yang, Biguo Huyan, Huaixun Pan, Xiaoqing Anisotropic and hierarchical SiC@SiO(2) nanowire aerogel with exceptional stiffness and stability for thermal superinsulation |
title | Anisotropic and hierarchical SiC@SiO(2) nanowire aerogel with exceptional stiffness and stability for thermal superinsulation |
title_full | Anisotropic and hierarchical SiC@SiO(2) nanowire aerogel with exceptional stiffness and stability for thermal superinsulation |
title_fullStr | Anisotropic and hierarchical SiC@SiO(2) nanowire aerogel with exceptional stiffness and stability for thermal superinsulation |
title_full_unstemmed | Anisotropic and hierarchical SiC@SiO(2) nanowire aerogel with exceptional stiffness and stability for thermal superinsulation |
title_short | Anisotropic and hierarchical SiC@SiO(2) nanowire aerogel with exceptional stiffness and stability for thermal superinsulation |
title_sort | anisotropic and hierarchical sic@sio(2) nanowire aerogel with exceptional stiffness and stability for thermal superinsulation |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7314525/ https://www.ncbi.nlm.nih.gov/pubmed/32637589 http://dx.doi.org/10.1126/sciadv.aay6689 |
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