生物电子学
材料科学
聚二甲基硅氧烷
磁致伸缩
复合数
悬臂梁
压力(语言学)
复合材料
磁场
纳米技术
偶极子
生物传感器
物理
语言学
量子力学
哲学
作者
Yihao Zhou,Xun Zhao,Jing Xu,Yunsheng Fang,Guorui Chen,Yang Song,Song Li,Jun Chen
出处
期刊:Nature Materials
[Springer Nature]
日期:2021-09-30
卷期号:20 (12): 1670-1676
被引量:223
标识
DOI:10.1038/s41563-021-01093-1
摘要
The magnetoelastic effect-the variation of the magnetic properties of a material under mechanical stress-is usually observed in rigid alloys, whose mechanical modulus is significantly different from that of human tissues, thus limiting their use in bioelectronics applications. Here, we observed a giant magnetoelastic effect in a soft system based on micromagnets dispersed in a silicone matrix, reaching a magnetomechanical coupling factor indicating up to four times more enhancement than in rigid counterparts. The results are interpreted using a wavy chain model, showing how mechanical stress changes the micromagnets' spacing and dipole alignment, thus altering the magnetic field generated by the composite. Combined with liquid-metal coils patterned on polydimethylsiloxane working as a magnetic induction layer, the soft magnetoelastic composite is used for stretchable and water-resistant magnetoelastic generators adhering conformably to human skin. Such devices can be used as wearable or implantable power generators and biomedical sensors, opening alternative avenues for human-body-centred applications.
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