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Research Article

A lightweight and high compressive resistance thermal insulation material with dual-network structure

Mengmeng Yang1, Zhaofeng Chen1( ), Yang Ding1, Wu Qiong1, Tianlong Liu1, Manna Li1, Lixia Yang1, Sheng Cui2
School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 211816, China
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Graphical Abstract

In this paper, a novel composite ceramic aerogel with arch-like and honeycomb-like cellular structure was prepared by assisting vacuum filtration and freezing-dry approach. Quasi layered multi arch structure endow aerogel with excellent mechanical robustness and super elasticity. Honeycomb structure and aerogel nanoparticles with infinite heat transfer path endow the composite aerogel with excellent thermal insulation performance. The aerogel also shows good thermal stability, ranging from −196 °C in liquid nitrogen to more than 1100 °C in butane burner, and good thermal insulation performance with a thermal conductivity of 24 mW/(m·k). These comprehensive properties make aerogel a promising candidate with mechanical strength and efficient elastic insulation materials.

Abstract

Ceramic fibrous aerogels are highly desirable for thermal management materials due to their high porosity, excellent elasticity, thermal conductivity, and good thermal resistance. However, the fabrication of nanofibrous aerogel with super-elasticity and good shape retention at the same time has remained challenging. To meet the requirements, a novel anisotropy nanofibrous-granular aerogel with a quasi-layered multi-arch-like and hierarchical-cellular structure is designed and prepared by vacuum-filtration-assisted freeze-drying and sintering. The quasi-layered multi-arch and flexible nanofibers endowed the aerogels with excellent mechanical robustness (ultimate stress up to 60 kPa with strain 60%) and super-elasticity with recoverable compression strain up to 60%. The introduced SiO2 aerogel nanoparticles and nanofibers are assembled into an arch-like structure and become the connection point of adjacent nanofibers, which endows low thermal conductivity (0.024 mW/(m·K)) of composite aerogel. This novel strategy provides a fresh perspective for the preparation of nanofibrous aerogel with robust mechanical in thermal insulation and other fields.

Keywords

nanofibrous aerogeldual-network structurethermal insulationnanofibrous-granular composite aerogelsstrong mechanical

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Nano Research
Volume 17 Issue 5,
May 2024
Pages 4279-4287
DOI: 10.1007/s12274-023-6315-5
Cite this article:
Yang M, Chen Z, Ding Y, et al. A lightweight and high compressive resistance thermal insulation material with dual-network structure. Nano Research, 2024, 17(5): 4279-4287. https://doi.org/10.1007/s12274-023-6315-5
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Received: 07 September 2023
Revised: 13 October 2023
Accepted: 03 November 2023
Published: 05 December 2023
© Tsinghua University Press 2023
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