Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Su, Lei, Wang, Hongjie, Niu, Min, Dai, Sheng, Cai, Zhixin, Yang, Biguo, Huyan, Huaixun, Pan, Xiaoqing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2020
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
_version_ 1783550078056660992
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
work_keys_str_mv AT sulei anisotropicandhierarchicalsicsio2nanowireaerogelwithexceptionalstiffnessandstabilityforthermalsuperinsulation
AT wanghongjie anisotropicandhierarchicalsicsio2nanowireaerogelwithexceptionalstiffnessandstabilityforthermalsuperinsulation
AT niumin anisotropicandhierarchicalsicsio2nanowireaerogelwithexceptionalstiffnessandstabilityforthermalsuperinsulation
AT daisheng anisotropicandhierarchicalsicsio2nanowireaerogelwithexceptionalstiffnessandstabilityforthermalsuperinsulation
AT caizhixin anisotropicandhierarchicalsicsio2nanowireaerogelwithexceptionalstiffnessandstabilityforthermalsuperinsulation
AT yangbiguo anisotropicandhierarchicalsicsio2nanowireaerogelwithexceptionalstiffnessandstabilityforthermalsuperinsulation
AT huyanhuaixun anisotropicandhierarchicalsicsio2nanowireaerogelwithexceptionalstiffnessandstabilityforthermalsuperinsulation
AT panxiaoqing anisotropicandhierarchicalsicsio2nanowireaerogelwithexceptionalstiffnessandstabilityforthermalsuperinsulation