材料科学
杰纳斯
自愈水凝胶
可穿戴计算机
磁电机
可穿戴技术
纳米技术
人体运动
胶粘剂
光电子学
运动(物理)
机械工程
计算机科学
磁铁
图层(电子)
人工智能
高分子化学
工程类
嵌入式系统
作者
Yan‐Jun Xu,Kehui Sun,Lingyi Huang,Yu Dai,Xiaojin Zhang,Fan Xia
标识
DOI:10.1021/acsami.3c19373
摘要
Janus hydrogels with different properties on the two surfaces have considerable potential in the field of material engineering applications. Various Janus hydrogels have been developed, but there are still some problems, such as stress mismatch caused by the double-layer structure and Janus failure caused by material diffusion in the gradient structure. Here, we report a Janus adhesive-tough hydrogel with polydopamine-decorated Fe3O4 nanoparticles (Fe3O4@PDA) at one side induced by magnetic field to avoid uncontrollable material diffusion in the cross-linking polymerization of acrylamide with alginate-calcium. The magneto-induced Janus (MIJ) hydrogel has an adhesive surface and a tough bulk without an obvious interface to avoid stress mismatch. Due to the intrinsic dissipative matrix and the abundant catechol groups on the adhesive surface, it shows strong adhesion onto various substrates. The MIJ hydrogel has high sensitivity (GF = 0.842) in detecting tiny human motion. Owing to the synergy of Fe3O4@PDA-enhanced interfacial adhesion and heat transfer, it is possible to quickly generate effective temperature differences when adhering to human skin. The MIJ hydrogel achieves a Seebeck coefficient of 13.01 mV·K–1 and an output power of 462.02 mW·m–2 at a 20 K temperature difference. This work proposes a novel strategy to construct Janus hydrogels for flexible wearable devices in human motion sensing and low-grade heat harvesting.
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