Bioinspired structure-robust cellulose nanocrystal films with enhanced water resistance, photothermal conversion ability
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ORIGINAL RESEARCH
Bioinspired structure-robust cellulose nanocrystal films with enhanced water resistance, photothermal conversion ability, and fluorescence Chenyang Cai . Zechang Wei . Yangze Huang . Pei Wang . Jianyue Song . Leixin Deng . Yu Fu
Received: 2 June 2020 / Accepted: 22 September 2020 Ó Springer Nature B.V. 2020
Abstract Assembling 1D cellulose nanocrystal into robust functional 3D macro-materials can be conducive to the broad application of nanocomposites, but it remains a huge challenge. Inspired by mussel-like adhesion and nacre structures, functionalized sodium alginate was in-situ synthesized with dopamine as a reinforcement agent and an interface jointer for the cellulose nanocrystal (CNC) nanocomposites with excellent mechanical properties. A rhodamine derivative was developed as a structural modifier to extend bulk strength as well as generate outstanding fluorescence. Through facile vacuum-assisted assembly, the
resulting nanocomposites showed 210% and 220% increase in strength and Young’s modulus respectively, without losing ductility. Such experiment results were much higher than those of the reported. The thermal stability and water resistance were also improved remarkably, with favorable fluorescent and photothermal conversion functionalities. This study explored a promising approach to prepare biomimetic CNC nanocomposites with favorable properties and extra functionality, showing great potentials for various applications in fluorescent probe field.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03484-0) contains supplementary material, which is available to authorized users. C. Cai Z. Wei Y. Huang P. Wang J. Song L. Deng Y. Fu (&) School of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China e-mail: [email protected]
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Cellulose
Graphic abstract
Keywords Cellulose nanocrystal Functionalized sodium alginate Nanocomposite films Water resistance Fluorescence
Introduction The quest for sustainable materials with competitive mechanical and functional performance based on renewable resources has been in high demand to support advances in diverse strategic fields, ranging from building and transportation to energy and biotechnology (Wang et al. 2015a). Among various biological building blocks, wood-derived nanocellulose biopolymers are emerging as one of the key building blocks for the plant-based materials of high mechanical performance because of their bio-derived stiff crystalline structure (Ecellulose = 138 - 145 GPa)(Iwamoto et al. 2009). Nanocellulose materials can be divided into cellulose nanocrystals (CNCs) and cellulose nanofibers (NFCs) (Ewulonu et al. 2019; Xue et al. 2017). Generally, CNCs are isolated from cellulose by a controlled hydrolysis using sulfuric acid
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and they maintained stable suspensions in aqueous media (Nan et al. 2017). Through controlling arrangement of nanocellulose into hierarchical
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