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Shape-recovery in organic solvents of water-responsive cellulose nanofiber actuators

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Abstract

In this work, we have prepared films based on cellulose nanofibers (CNFs) that mimic plant responsiveness to water by shape-changing. Film twisting was achieved by creating an asymmetrical expansion through a gradient of carboxylate groups within the CNF film thickness. We present the characterization of pristine and modified CNFs, and their swelling and mechanical performances when conditioned into films. The immersion in water and organic solvents (isopropanol, ethanol, DMSO, acetonitrile, and cyclohexane) allowed controlling the asymmetrical expansion. Hence, film twisting is triggered when immersed in water and their shape recoveries were accomplished by dipping them in organic solvents. We investigated the main physicochemical interactions between the different CNFs and solvents governing film expansion. This work leaves the door open for the design of biomimetic cellulose-based materials for soft robotics, building materials, and electronic applications.

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The datasets generated during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The authors gratefully thank the financial support of Région Pays de la Loire and Transform Division from the French National Research Institute for Agriculture, Food and Environment. The authors acknowledge the Bioresources, Imaging, Biochemistry, and Structure (BIBS) platform of INRAE for the access to microscopy facilities (Bruno Novales) and X-ray diffraction (Bruno Pontoire). Anne-Laure Reguerre is acknowledged for the excellent technical support for image acquisition and treatment. We gratefully acknowledge Borregaard for kindly supplying the cellulose nanofibers.

Funding

The authors gratefully thank the financial support of Région Pays de la Loire and Transform Division from the French National Research Institute for Agriculture, Food and Environment.

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Contributions

LL: Conceptualization, investigation, discussion, writing—original draft, writing—review and editing. CM: Discussion, writing—review and editing. DL: Investigation, discussion, writing—review and editing. BC: Discussion, Writing—review and editing. AV: Conceptualization, Investigation, discussion, funding acquisition, project administration, supervision, writing—review and editing. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Lisa Lopes da Costa.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Lopes da Costa, L., Moreau, C., Lourdin, D. et al. Shape-recovery in organic solvents of water-responsive cellulose nanofiber actuators. Cellulose 30, 5811–5824 (2023). https://doi.org/10.1007/s10570-023-05230-8

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  • DOI: https://doi.org/10.1007/s10570-023-05230-8

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