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Article

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

by
Xin Yang
1,2,3,
Pengjie Jiang
1,2,3,
Rui Xiao
1,2,
Rui Fu
1,2,3,*,
Yinghui Liu
1,2,3,
Chao Ji
1,2,
Qiqi Song
1,2,3,
Changqing Miao
1,2,3,
Hanqing Yu
1,2,3,
Jie Gu
1,2,3,
Yaxiong Wang
1,2,3 and
Huazheng Sai
1,2,3,*
1
School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China
2
Inner Mongolia Key Laboratory of Coal Chemical Engineering & Comprehensive Utilization, Inner Mongolia University of Science & Technology, Baotou 014010, China
3
Aerogel Functional Nanomaterials Laboratory, Inner Mongolia University of Science & Technology, Baotou 014010, China
*
Authors to whom correspondence should be addressed.
Gels 2022, 8(5), 303; https://doi.org/10.3390/gels8050303
Submission received: 28 March 2022 / Revised: 10 May 2022 / Accepted: 10 May 2022 / Published: 16 May 2022
(This article belongs to the Special Issue Recent Advances in Silica Aerogel Composites for Thermal Superinsulation)
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Abstract

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 CO2 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 m2/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.
Keywords: silica aerogels; agarose aerogel; nanocomposites; interpenetrating network; mechanical properties; thermal insulation silica aerogels; agarose aerogel; nanocomposites; interpenetrating network; mechanical properties; thermal insulation
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MDPI and ACS Style

Yang, X.; Jiang, P.; Xiao, R.; Fu, R.; Liu, Y.; Ji, C.; Song, Q.; Miao, C.; Yu, H.; Gu, J.; et al. Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process. Gels 2022, 8, 303. https://doi.org/10.3390/gels8050303

AMA Style

Yang X, Jiang P, Xiao R, Fu R, Liu Y, Ji C, Song Q, Miao C, Yu H, Gu J, et al. Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process. Gels. 2022; 8(5):303. https://doi.org/10.3390/gels8050303

Chicago/Turabian Style

Yang, Xin, Pengjie Jiang, Rui Xiao, Rui Fu, Yinghui Liu, Chao Ji, Qiqi Song, Changqing Miao, Hanqing Yu, Jie Gu, and et al. 2022. "Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process" Gels 8, no. 5: 303. https://doi.org/10.3390/gels8050303

APA Style

Yang, X., Jiang, P., Xiao, R., Fu, R., Liu, Y., Ji, C., Song, Q., Miao, C., Yu, H., Gu, J., Wang, Y., & Sai, H. (2022). Robust Silica–Agarose Composite Aerogels with Interpenetrating Network Structure by In Situ Sol–Gel Process. Gels, 8(5), 303. https://doi.org/10.3390/gels8050303

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