标題: Bioinspired Multiscale Micro-/Nanofiber Network Design Enabling Extremely Compressible, Fatigue-Resistant, and Rapidly Shape-Recoverable Cryogels

作者: Qi, LH (Qi, Luhe); Wang, S (Wang, Sen); Chen, L (Chen, Lu); Yu, L (Yu, Le); Guo, XJ (Guo, Xiaojia); Chen, MX (Chen, Mingxiang); Ouyang, WE (Ouyang, Wengen); Shi, XW (Shi, Xiaowen); Chen, CJ (Chen, Chaoji)

來源出版物: ACS NANO DOI: 10.1021/acsnano.2c10462 提前訪問日期: MAR 2023

摘要: Cryogels with extreme mechanical properties such as ultrahigh compressibility, fatigue resistance, and rapid recovery are attractive in biomedical, environmental remediation, and energy storage applications, which, however, are difficult to achieve in man-made materials. Here, inspired by the multiscale macro-/microfiber network structure of spider web, we construct an ultraelastic chitosan cryogel with interconnected hybrid micro-/ nanofibers (CMNF cryogels) via freeze-induced physicochemical cross-linking. Chitosan chains are directionally assembled into high-aspect-ratio microfibers and nanofibers under shear-flow induction, which are further assembled into an interconnected three-dimensional (3D) network structure with staggered microfibers and nanofibers. In this multiscale network, nanofibers connecting the microfibers improve the stability, while microfibers improve the elasticity of the CMNF cryogels through long-range interaction. The synergy of the two-scale fibers endows the CMNF cryogel with extraordinary mechanical properties in comparison to those assembled with single-scale fibers, including its ultrahigh ultimate strain (97% strain with 50 cycles), excellent fatigue resistance (3200 compressing-releasing cycles at 60% compression strain), and rapid water-triggered shape recovery (recovering in similar to 1 s). Moreover, the fibrous CMNF cryogel shows excellent functionalization capability via the rapid assembly of nanoscale building blocks for flexible electronics and environmental remediation. Our work thereby demonstrates the potential of this bioinspired strategy for designing gel materials with extreme mechanical properties.

作者關鍵詞: cryogel; chitosan; bioinspired; biomass; fatigue-resistant

地址: [Qi, Luhe; Chen, Lu; Yu, Le; Guo, Xiaojia; Shi, Xiaowen; Chen, Chaoji] Wuhan Univ, Sch Resource & Environm Sci, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Peoples R China.

[Wang, Sen; Chen, Mingxiang; Ouyang, Wengen] Wuhan Univ, Sch Civil Engn, Dept Engn Mech, Wuhan 430072, Hubei, Peoples R China.

通訊作者地址: Shi, XW; Chen, CJ (通訊作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Peoples R China.

Ouyang, WE (通訊作者)，Wuhan Univ, Sch Civil Engn, Dept Engn Mech, Wuhan 430072, Hubei, Peoples R China.

電子郵件地址: w.g.ouyang@whu.edu.cn; shixw@whu.edu.cn; chenchaojili@whu.edu.cn

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