纤维素
自愈水凝胶
材料科学
化学工程
离子
各向异性
离子交换
复合材料
纳米技术
高分子化学
有机化学
化学
量子力学
物理
工程类
作者
Shuai Zhou,Kechun Guo,Danil Bukhvalov,Xiong‐Fei Zhang,Wenzhuo Zhu,Jianfeng Yao,Ming He
标识
DOI:10.1002/admt.202000358
摘要
Abstract Inspired by biological camouflage strategy according to the surrounding environment, a facile method to fabricate state‐switchable cellulose hydrogels (fluid, brittle, and rigid hydrogel) driven by Ca 2+ /Zn 2+ ion exchange is reported. The high content of Ca 2+ ions leads to the formation of a rigid hydrogel (Gel‐H‐Ca 2+ ) with a great compressive strength (≈2.2 MPa) through coordination cross‐linking network, while Zn 2+ ions give the cellulose (Sol‐L‐Zn 2+ ) a fluid state by eliminating the cellulose intermolecular connections, making it possible to obtain injectable and healable hydrogels. Gel‐H‐Ca 2+ is highly oriented and anisotropic, and such flexible hydrogel can effectively monitor slight bending and pressure changes of fingers. This cellulose hydrogel will be a promising candidate for bionic and multifunctional sensors.
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