Anisotropic cellulose nanocrystal hydrogel with multi-stimuli response to temperature and mechanical stress.

Autor: Liu L; Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 3B3, Canada; School of Materials Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China., Tanguy NR; Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 3B3, Canada., Yan N; Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 3B3, Canada. Electronic address: ning.yan@utoronto.ca., Wu Y; School of Materials Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China. Electronic address: wuyiqiang@csuft.edu.cn., Liu X; School of Materials Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China; Hunan Province Key Laboratory of Materials Surface and Interface Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China., Qing Y; School of Materials Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2022 Mar 15; Vol. 280, pp. 119005. Date of Electronic Publication: 2021 Dec 24.
DOI: 10.1016/j.carbpol.2021.119005
Abstrakt: Conventional hydrogels with isotropic polymer networks usually lack selective response to external stimuli and that limits their applications in intelligent devices. Herein, hydrogels with distinctive anisotropic optical characteristics combined with thermosensitivity were prepared through in situ photopolymerization. Self-assembled cellulose nanocrystals (CNCs) with chiral nematic ordered structure were embedded in polyethylene glycol derivatives/polyacrylamide polymer networks. The arrangement of CNCs showed a strong dependence on the self-assembly angle and standing time, enabling the fabrication of hydrogels with customizable CNCs arrangements. Increasing the self-assembly angle from 0° to 90° changed the CNCs arrangement from chiral nematic to symmetrical nematic order which, together with CNCs dynamic arrangement from isotropic to annealed chiral nematic phase at longer standing time, provided versatile ways to produce CNCs hydrogels with tunable anisotropic properties. In addition, the obtained hydrogel displayed reversible temperature and compression response, showing excellent promise to be used as soft mechanical stress and temperature sensors or novel anti-counterfeiting materials.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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