An arm-like electrothermal actuator based on superaligned carbon nanotube/polymer composites
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摘要: 与超顺排碳纳米管薄膜相互浸润的高分子具有均匀的导电性、良好的生物兼容性、合适的力学性能，它在电热型致动器研究领域具有广阔的应用前景。在本文中，首先利用这种具有双层结构的复合材料制作了一个简单的U型小器件来展示电热致动器的工作原理，在电热的作用下该小器件能够产生730°的卷曲。其次，本文介绍了一种具有旋转结构手臂状的致动器（人工手臂）。在低电场（小于41 V or 500 V/m）的作用下，该人工手臂能够产生大的形变（大于700°旋转，49.2%的长度收缩和26.4%的直径收缩）。所制作的人工手臂和U型小器件能够受电压（或电功率）的精确控制。该人工手臂能够握起4 g （自重的26倍）的重物，展示了一种新的抓取物体的方式，在仿生领域具有良好的应用前景。Abstract: A superaligned carbon nanotube film embedded in polymers shows promising applications in the fields of electrothermal actuation because of their homogenous conductivity, good biocompatibility and mechanical properties. We fabricated a simple U-shaped gadget from the composite to investigate the electrothermal actuation mechanism. The gadget can curl to 730°, which is several times larger than existing actuators. A helix-shaped arm-like actuator (artificial arm) was also made from the composite, which exhibited a large twisting deformation (more than 700° twisting, 49.2% length constriction and 26.4% diameter constriction) when driven with low electrical fields (less than 500 V/m or 41 V). The actuation of the U-shaped gadget and the artificial arm can be precisely controlled by the applied voltage or electrical power. The gripping force of the clenched arm is about 4 g, 26 times its own weight. This points to a new way for manipulating objects and its potential application in the biomimetic field.
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Key words:
- Composite materials /
- Electrothermal /
- Twisting /
- Actuator /
- Application
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