Issue

Vol. 12 (2020)

Elastic Aerogels of Cellulose Nanofibers@Metal–Organic Frameworks for Thermal Insulation and Fire Retardancy

https://doi.org/10.1007/s40820-019-0343-4
Shengyang Zhou
Nanotechnology and Functional Materials, Department of Engineering Sciences, Ångström Laboratory, Uppsala University, 751 21 Uppsala, Sweden
Varvara Apostolopoulou‑Kalkavoura
Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden
Marcus Vinícius Tavares da Costa
Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden
Lennart Bergström
Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden
Maria Strømme
Nanotechnology and Functional Materials, Department of Engineering Sciences, Ångström Laboratory, Uppsala University, 751 21 Uppsala, Sweden
Chao Xu
Nanotechnology and Functional Materials, Department of Engineering Sciences, Ångström Laboratory, Uppsala University, 751 21 Uppsala, Sweden

Corresponding Author: Chao Xu

chao.xu@angstrom.uu.se

Nano-Micro Letters, Vol. 12 (2020), Article Number: 9

Abstract

Metal–organic frameworks (MOFs) with high microporosity and relatively high thermal stability are potential thermal insulation and flame-retardant materials. However, the difficulties in processing and shaping MOFs have largely hampered their applications in these areas. This study outlines the fabrication of hybrid CNF@MOF aerogels by a stepwise assembly approach involving the coating and cross-linking of cellulose nanofibers (CNFs) with continuous nanolayers of MOFs. The cross-linking gives the aerogels high mechanical strength but superelasticity (80% maximum recoverable strain, high specific compression modulus of ~ 200 MPa cm3 g−1, and specific stress of ~ 100 MPa cm3 g−1). The resultant lightweight aerogels have a cellular network structure and hierarchical porosity, which render the aerogels with relatively low thermal conductivity of ~ 40 mW m−1 K−1. The hydrophobic, thermally stable MOF nanolayers wrapped around the CNFs result in good moisture resistance and fire retardancy. This study demonstrates that MOFs can be used as efficient thermal insulation and flame-retardant materials. It presents a pathway for the design of thermally insulating, superelastic fire-retardant nanocomposites based on MOFs and nanocellulose.

Highlights
1 The study reveals the great potential of metal–organic framework (MOF)-based nanocomposites in thermal insulation and fire retardancy applications.
2 A nanoengineering approach was developed to process MOFs into freestanding, mechanically strong, and elastic aerogels, which may boost the fundamental research and practical applications of MOFs in these areas.


Keywords

Metal–organic frameworks Nanocellulose Superelastic aerogel Thermal insulation Fire retardancy
Zhou, Shengyang, Varvara Apostolopoulou‑Kalkavoura, Marcus Vinícius Tavares da Costa, Lennart Bergström, Maria Strømme, and Chao Xu. 2019. “Elastic Aerogels of Cellulose Nanofibers@Metal–Organic Frameworks for Thermal Insulation and Fire Retardancy”. Nano-Micro Letters 12 (December):9. https://doi.org/10.1007/s40820-019-0343-4.
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