Bioinspired Stabilization of Amorphous Calcium Carbonate by Carboxylated Nanocellulose Enables Mechanically Robust, Healable, and Sensing Biocomposites

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2023
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Wu, Wanlin
Lu, Zhixing
Lu, Canhui
Sun, Xunwen
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ACS Nano ; 17 (2023), 7. - S. 6664-6674. - ACS Publications. - ISSN 1936-0851. - eISSN 1936-086X
Zusammenfassung
Nature builds numerous structurally complex composites with fascinating mechanical robustness and functionalities by harnessing biopolymers and amorphous calcium carbonate (ACC). The key to successfully mimicking these natural designs is efficiently stabilizing ACC, but developing highly efficient, biodegradable, biocompatible, and sustainable stabilizing agents remains a grand challenge since anhydrous ACC is inherently unstable toward crystallization in the wet state. Inspired by the stabilized ACC in crustacean cuticles, we report the efficient stabilization ability of the most abundant biopolymer–cellulose nanofibrils (CNFs) for ACC. Through the cooperative stabilizing effect of surface carboxyl groups and a rigid segregated network, the CNFs exhibit long-term stability (more than one month) and achieved a stabilization efficiency of 3.6 and 4.4 times that of carboxymethyl cellulose (CMC) and alginate, respectively, even higher than poly(acrylic acid). The resulting CNF/ACC dispersions can be constructed into transparent composite films with the high strength of 286 MPa and toughness up to 28.5 MJ/m3, which surpass those of the so far reported synthetic biopolymer-calcium carbonate/phosphate composites. The dynamic interfacial interaction between nanocomponents also provides the composite films with good self-healing properties. Owing to their good wet stability, the composite films present high humidity sensitivity for monitoring respiration and finger contact.
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540 Chemie
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amorphous calcium carbonate,biomineralization,nanocellulose,biocomposites,mechanical properties
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ISO 690WU, Wanlin, Zhixing LU, Canhui LU, Xunwen SUN, Bing NI, Helmut CÖLFEN, Rui XIONG, 2023. Bioinspired Stabilization of Amorphous Calcium Carbonate by Carboxylated Nanocellulose Enables Mechanically Robust, Healable, and Sensing Biocomposites. In: ACS Nano. ACS Publications. 17(7), pp. 6664-6674. ISSN 1936-0851. eISSN 1936-086X. Available under: doi: 10.1021/acsnano.2c12385
BibTex
@article{Wu2023Bioin-66793,
  year={2023},
  doi={10.1021/acsnano.2c12385},
  title={Bioinspired Stabilization of Amorphous Calcium Carbonate by Carboxylated Nanocellulose Enables Mechanically Robust, Healable, and Sensing Biocomposites},
  number={7},
  volume={17},
  issn={1936-0851},
  journal={ACS Nano},
  pages={6664--6674},
  author={Wu, Wanlin and Lu, Zhixing and Lu, Canhui and Sun, Xunwen and Ni, Bing and Cölfen, Helmut and Xiong, Rui}
}
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