Micrometer-sized electrically programmable shape-memory actuators for low-power microrobotics
Micrometer-sized electrically programmable shape-memory actuators for low-power microrobotics
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DOI：
10.1126/scirobotics.abe6663
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发表时间：
2021-03-17
期刊：
影响因子：
25
通讯作者：
Cohen, Itai
中科院分区：
文献类型：
--
作者：
Liu, Qingkun;Wang, Wei;Cohen, Itai
形状记忆执行器允许从机器人到医疗植入物的各种机器在没有持续电力的情况下保持其形状，这一功能对于这些设备不受限制和电力有限的情况特别有利。尽管以前的工作已经证明了使用聚合物、合金和陶瓷的形状记忆致动器，但微米级的电形状记忆致动器的需求仍然很大程度上没有得到满足，特别是那些可以由标准电子设备(类似于1伏)驱动的致动器。在这里，我们报告了一种新型的快速、高曲率、低电压、可重构的微米级形状记忆执行器。它们的作用是通过铂表面的电化学氧化/还原，在氧化层中产生导致弯曲的应变。它们弯曲到任何电控微执行器的最小曲率半径(类似于500纳米)，速度快(
Shape-memory actuators allow machines ranging from robots to medical implants to hold their form without continuous power, a feature especially advantageous for situations where these devices are untethered and power is limited. Although previous work has demonstrated shape-memory actuators using polymers, alloys, and ceramics, the need for micrometer-scale electro-shape-memory actuators remains largely unmet, especially ones that can be driven by standard electronics (similar to 1 volt). Here, we report on a new class of fast, high-curvature, low-voltage, reconfigurable, micrometer-scale shape-memory actuators. They function by the electrochemical oxidation/reduction of a platinum surface, creating a strain in the oxidized layer that causes bending. They bend to the smallest radius of curvature of any electrically controlled microactuator (similar to 500 nanometers), are fast (