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Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process

Aerogels are three-dimensional nanoporous materials with outstanding properties, especially great thermal insulation. Nevertheless, their extremely high brittleness restricts their practical application. Recently, although the mechanical properties of silica aerogels have been improved by regulating...

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Autores principales: Yang, Xin, Jiang, Pengjie, Xiao, Rui, Fu, Rui, Liu, Yinghui, Ji, Chao, Song, Qiqi, Miao, Changqing, Yu, Hanqing, Gu, Jie, Wang, Yaxiong, Sai, Huazheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9141877/
https://www.ncbi.nlm.nih.gov/pubmed/35621601
http://dx.doi.org/10.3390/gels8050303
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author Yang, Xin
Jiang, Pengjie
Xiao, Rui
Fu, Rui
Liu, Yinghui
Ji, Chao
Song, Qiqi
Miao, Changqing
Yu, Hanqing
Gu, Jie
Wang, Yaxiong
Sai, Huazheng
author_facet Yang, Xin
Jiang, Pengjie
Xiao, Rui
Fu, Rui
Liu, Yinghui
Ji, Chao
Song, Qiqi
Miao, Changqing
Yu, Hanqing
Gu, Jie
Wang, Yaxiong
Sai, Huazheng
author_sort Yang, Xin
collection PubMed
description Aerogels are three-dimensional nanoporous materials with outstanding properties, especially great thermal insulation. Nevertheless, their extremely high brittleness restricts their practical application. Recently, although the mechanical properties of silica aerogels have been improved by regulating the precursor or introducing a polymer reinforcer, these preparation processes are usually tedious and time-consuming. The purpose of this study was to simplify the preparation process of these composite aerogels. A silicic acid solution treated with cation exchange resin was mixed with agarose (AG) to gel in situ, and then composite aerogels (CAs) with an interpenetrating network (IPN) structure were obtained by aging and supercritical CO(2) fluid (SCF) drying. Compared to previous works, the presented CAs preparation process is briefer and more environmentally friendly. Moreover, the CAs exhibit a high specific surface area (420.5 m(2)/g), low thermal conductivity (28.9 mW m(−1) K(−1)), excellent thermal insulation properties, and thermal stability. These results show that these CAs can be better used in thermal insulation.
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spelling pubmed-91418772022-05-28 Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process Yang, Xin Jiang, Pengjie Xiao, Rui Fu, Rui Liu, Yinghui Ji, Chao Song, Qiqi Miao, Changqing Yu, Hanqing Gu, Jie Wang, Yaxiong Sai, Huazheng Gels Article Aerogels are three-dimensional nanoporous materials with outstanding properties, especially great thermal insulation. Nevertheless, their extremely high brittleness restricts their practical application. Recently, although the mechanical properties of silica aerogels have been improved by regulating the precursor or introducing a polymer reinforcer, these preparation processes are usually tedious and time-consuming. The purpose of this study was to simplify the preparation process of these composite aerogels. A silicic acid solution treated with cation exchange resin was mixed with agarose (AG) to gel in situ, and then composite aerogels (CAs) with an interpenetrating network (IPN) structure were obtained by aging and supercritical CO(2) fluid (SCF) drying. Compared to previous works, the presented CAs preparation process is briefer and more environmentally friendly. Moreover, the CAs exhibit a high specific surface area (420.5 m(2)/g), low thermal conductivity (28.9 mW m(−1) K(−1)), excellent thermal insulation properties, and thermal stability. These results show that these CAs can be better used in thermal insulation. MDPI 2022-05-16 /pmc/articles/PMC9141877/ /pubmed/35621601 http://dx.doi.org/10.3390/gels8050303 Text en © 2022 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
Yang, Xin
Jiang, Pengjie
Xiao, Rui
Fu, Rui
Liu, Yinghui
Ji, Chao
Song, Qiqi
Miao, Changqing
Yu, Hanqing
Gu, Jie
Wang, Yaxiong
Sai, Huazheng
Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process
title Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process
title_full Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process
title_fullStr Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process
title_full_unstemmed Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process
title_short Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process
title_sort robust silica–agarose composite aerogels with interpenetrating network structure by in situ sol–gel process
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9141877/
https://www.ncbi.nlm.nih.gov/pubmed/35621601
http://dx.doi.org/10.3390/gels8050303
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