Lifetime of Liquid Metal Wires for Stretchable Devices
Lifetime of Liquid Metal Wires for Stretchable Devices
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DOI：
10.1002/admt.202001100
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发表时间：
2021-02
影响因子：
6.8
通讯作者：
K. Dorsey;N. Lazarus
中科院分区：
文献类型：
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作者：
K. Dorsey;N. Lazarus
随着可拉伸设备在软机器人和可穿戴设备中的应用得到了很好的确立，使这些应用成为可能的顺应性导体也必须是可靠的，并且在整个设备寿命期间都能存活。液体金属如Galinstan是无毒、可拉伸和低电阻导体的潜在解决方案。然而，对液态金属寿命的严格研究是有限的。这项工作展示了在1 kAcm−2量级的电流密度下填充液态金属的硅胶管的中值寿命，这对于电磁致动器等应用是必要的。在这些导体中，随着电流从2 kAcm− 2减小到1 kAcm−2，中值寿命增加超过4700倍。通过冷却样品，中值失效时间从112 s增加到9.4 h，这表明通过增加热导率或通过使所施加的电流占空比来最大化液态金属线寿命的直接解决方案。
As stretchable devices become well established for applications in soft robotics and wearable devices, the compliant conductors that make these applications possible must also be reliable and survive for the entire device lifetime. Liquid metals such as Galinstan are a potential solution as non‐toxic, stretchable, and low‐resistance conductors. Rigorous investigations of liquid metal lifetimes, however, are limited. This work presents the median lifetime of liquid metal‐filled silicone tubes under current density on the order of 1 kAcm−2, which is necessary for applications such as electromagnetic actuators. In these conductors, the median lifetime increases by a factor of over 4700 as current decreases from 2 to 1 kAcm−2. By cooling the sample, median failure time increases from 112 s to 9.4 h, which suggests straightforward solutions to maximize liquid metal wire lifetime by increasing thermal conductivity or by duty cycling the applied current.