Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 1, Pages 1381-1388Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b05085
Keywords
Nanocellulose aerogels; Anisotropic structure; Elasticity-enhanced; Chemical cross-linking
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Funding
- National Nonprofit Special Fund for Fundamental Research from Chinese Academy of Forestry [CAFYBB2017SY038]
- National Natural Science Foundation of China [31700480]
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Cellulose nanofibril (CNF) aerogels are renewable and biocompatible materials with high porosity and tunable surface chemistry. However, ultralight and ultraporous aerogels remain a great challenge to obtain high elasticity. This work focused on a scalable strategy to create large-scale lamellar-aligned CNF foam-like aerogels and the relationship between structure and mechanical properties. The morphology and mechanical properties of aerogels assembled by original TEMPO-mediated oxidation CNF cross-linking with 1,2,3,4-butanetetracarboxylic acid were investigated for homogeneous freezer freezing and unidirectional gradient freeze casting. This study successfully fabricated ultralight foam-like aerogels with centimeter-sized and aligned lamellar/porous structure via cooperation of tunable chemical reaction and unidirectional gradient freezing. The resulting aerogels exhibited flyweight densities of 3-4 mg/cm(3), enhanced recovery from 70% strain, water adsorption 82.5 times over self-weight at 20 degrees C and 52.0 times over self-weight at high temperature (100 degrees C) for 20 cycles. Moreover, the aligned aerogel followed by carbonization showed a differential and anisotropic electrical resistivity.
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