Elasticity-Enhanced and Aligned Structure Nanocellulose Foam-like Aerogel Assembled with Cooperation of Chemical Art and Gradient Freezing,ACS Sustainable Chemistry & Engineering

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Elasticity-Enhanced and Aligned Structure Nanocellulose Foam-like Aerogel Assembled with Cooperation of Chemical Art and Gradient Freezing
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-12-11 00:00:00 , DOI: 10.1021/acssuschemeng.8b05085
Yuan Chen ₁ , Dongbin Fan ₁ , Shaoyi Lyu ₁ , Gaiyun Li ₁ , Feng Jiang ₂ , Siqun Wang _{1,

3}

Affiliation

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/cm³, enhanced recovery from 70% strain, water adsorption 82.5 times over self-weight at 20 °C and 52.0 times over self-weight at high temperature (100 °C) for 20 cycles. Moreover, the aligned aerogel followed by carbonization showed a differential and anisotropic electrical resistivity.

中文翻译：

结合化学技术和梯度冻结技术，增强弹性和排列结构的纳米纤维素泡沫状气凝胶

纤维素纳米原纤维（CNF）气凝胶是具有高孔隙率和可调表面化学性质的可再生和生物相容性材料。然而，超轻和超多孔气凝胶仍然是获得高弹性的巨大挑战。这项工作集中于可扩展的策略，以创建大规模的层状排列的CNF泡沫状气凝胶，以及结构和机械性能之间的关系。研究了由原始TEMPO介导的氧化CNF与1,2,3,4-丁烷四羧酸交联而组装的气凝胶的形态和力学性能，以进行均匀的冷冻室冷冻和单向梯度冷冻铸造。这项研究成功地通过可调谐化学反应和单向梯度冻结的合作，成功地制造了具有厘米大小且排列整齐的层状/多孔结构的超轻泡沫状气凝胶。³，提高了从70％应变的恢复能力，在20个循环中，水的吸附量比20℃的自重高82.5倍，比20℃的自重高52.0倍。而且，对齐的气凝胶随后碳化显示出差的和各向异性的电阻率。

更新日期：2018-12-11

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