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Anisotropic nanocellulose aerogels with ordered structures fabricated by directional freeze-drying for fast liquid transport

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Abstract

Directional freeze-drying is considered to regulate the structure of nanocellulose aerogels with special performances. In this work, TEMPO-oxidized cellulose nanofiber aerogels with high porosity (> 99.5%) and low density (~ 7 mg/cm3) were produced by different freeze-drying methods. The effects of temperature, freezing reagents and freezing methods on the structure and properties of aerogels were investigated. Among them, an anisotropic cellulose aerogel was obtained using a simple and flexible directional freezing in ethanol of − 30 °C by a self-made directional freezer. Our results demonstrated that it could present honeycomb-like pores in the transverse direction and regular directional tunnels in the longitudinal direction, and some attractive features, such as high water adsorption (120 g/g) and stability in water. Compared with other aerogels, this anisotropic structure also provided the aerogel with excellent compressive property (15.2 kPa) and faster liquid transport (4.95 mm/s) in the longitudinal direction than in other directions. The distinctive aerogels based on nanocellulose by directional freeze-drying are also expected to be combined with multifunctional materials to achieve directional applications to meet the requirements of different fields.

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Acknowledgments

This study was funded by the National Natural Science Foundation of China (Grant Nos. 51803093, 31670556 and 31770609), Natural Science Foundation of Jiangsu Province (BK20180770), Natural Science Foundation of Jiangsu Province for Outstanding Young Scholars (BK20180090), and 333 Project Foundation of Jiangsu Province (BRA2018337).

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Correspondence to Changtong Mei or Shaohua Jiang.

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Chen, Y., Zhou, L., Chen, L. et al. Anisotropic nanocellulose aerogels with ordered structures fabricated by directional freeze-drying for fast liquid transport. Cellulose 26, 6653–6667 (2019). https://doi.org/10.1007/s10570-019-02557-z

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  • DOI: https://doi.org/10.1007/s10570-019-02557-z

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