Cargando…
Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation
In this study, we used two methods to prepare alumina-doped silica aerogels with the aim of increasing the thermal stability of silica aerogels. The first method was physical doping of α-Al(2)O(3) nano powders, and the second method was to create a chemical compound via the co-precursor of TEOS and...
Autores principales: | , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8395836/ https://www.ncbi.nlm.nih.gov/pubmed/34449593 http://dx.doi.org/10.3390/gels7030122 |
_version_ | 1783744260954128384 |
---|---|
author | Wu, Yu Wang, Xiaodong Liu, Lin Zhang, Ze Shen, Jun |
author_facet | Wu, Yu Wang, Xiaodong Liu, Lin Zhang, Ze Shen, Jun |
author_sort | Wu, Yu |
collection | PubMed |
description | In this study, we used two methods to prepare alumina-doped silica aerogels with the aim of increasing the thermal stability of silica aerogels. The first method was physical doping of α-Al(2)O(3) nano powders, and the second method was to create a chemical compound via the co-precursor of TEOS and AlCl(3)·6H(2)O in different proportions. The shrinkage, chemical composition, and specific surface area (SSA) of samples after heating at different temperatures were analyzed. Our results show that the silicon hydroxyl groups of samples derived from AlCl(3)·6H(2)O gradually decreased and nearly disappeared after heating at 800 °C, which indicates the complete dehydration of the silicon hydroxyl. Thus, the samples exhibited a large linear shrinkage and decreased SSA after high-temperature heat treatment. By contrast, samples doped with α-Al(2)O(3) powders retained abundant silicon hydroxyl groups, and the 6.1 wt.% α-Al(2)O(3)-doped sample exhibited the lowest linear shrinkage of 11% and the highest SSA of 1056 m(2)/g after heat treatment at 800 °C. The alumina-doped silica aerogels prepared using a simple and low-price synthesized method pave the way for the low-cost and large-scale production of high-temperature thermal insulation. |
format | Online Article Text |
id | pubmed-8395836 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-83958362021-08-28 Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation Wu, Yu Wang, Xiaodong Liu, Lin Zhang, Ze Shen, Jun Gels Article In this study, we used two methods to prepare alumina-doped silica aerogels with the aim of increasing the thermal stability of silica aerogels. The first method was physical doping of α-Al(2)O(3) nano powders, and the second method was to create a chemical compound via the co-precursor of TEOS and AlCl(3)·6H(2)O in different proportions. The shrinkage, chemical composition, and specific surface area (SSA) of samples after heating at different temperatures were analyzed. Our results show that the silicon hydroxyl groups of samples derived from AlCl(3)·6H(2)O gradually decreased and nearly disappeared after heating at 800 °C, which indicates the complete dehydration of the silicon hydroxyl. Thus, the samples exhibited a large linear shrinkage and decreased SSA after high-temperature heat treatment. By contrast, samples doped with α-Al(2)O(3) powders retained abundant silicon hydroxyl groups, and the 6.1 wt.% α-Al(2)O(3)-doped sample exhibited the lowest linear shrinkage of 11% and the highest SSA of 1056 m(2)/g after heat treatment at 800 °C. The alumina-doped silica aerogels prepared using a simple and low-price synthesized method pave the way for the low-cost and large-scale production of high-temperature thermal insulation. MDPI 2021-08-14 /pmc/articles/PMC8395836/ /pubmed/34449593 http://dx.doi.org/10.3390/gels7030122 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wu, Yu Wang, Xiaodong Liu, Lin Zhang, Ze Shen, Jun Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation |
title | Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation |
title_full | Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation |
title_fullStr | Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation |
title_full_unstemmed | Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation |
title_short | Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation |
title_sort | alumina-doped silica aerogels for high-temperature thermal insulation |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8395836/ https://www.ncbi.nlm.nih.gov/pubmed/34449593 http://dx.doi.org/10.3390/gels7030122 |
work_keys_str_mv | AT wuyu aluminadopedsilicaaerogelsforhightemperaturethermalinsulation AT wangxiaodong aluminadopedsilicaaerogelsforhightemperaturethermalinsulation AT liulin aluminadopedsilicaaerogelsforhightemperaturethermalinsulation AT zhangze aluminadopedsilicaaerogelsforhightemperaturethermalinsulation AT shenjun aluminadopedsilicaaerogelsforhightemperaturethermalinsulation |