An autonomous actuator driven by fluctuations in ambient humidity
An autonomous actuator driven by fluctuations in ambient humidity
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DOI：
10.1038/nmat4693
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发表时间：
2016-10-01
期刊：
影响因子：
41.2
通讯作者：
Aida, Takuzo
中科院分区：
文献类型：
--
作者：
Arazoe, Hiroki;Miyajima, Daigo;Aida, Takuzo
对环境条件中微小波动做出响应的设备对于实现更可持续、低功耗的致动器和电子系统具有重要价值。在这里，我们报告了一种前所未有的薄膜致动器，它似乎是自主操作的，因为它对可能由环境湿度波动引起的微量水（每10 mm（2）几百纳克）的吸附和解吸作出响应。驱动非常迅速（一次卷曲50 ms），可以重复10，000次以上而不会劣化。在加热或光照射下，薄膜失去吸附的水并迅速弯曲，因此它可以从表面垂直跳到10 mm或撞到玻璃珠。该膜由通过碳酸胍的一锅气相沉积聚合形成的π-堆叠的氮化碳聚合物（1）组成，并且其特征在于坚韧、超轻和高度各向异性的层状结构。还示出了部分保护免于水吸附的致动器单向行走。
Devices that respond to negligibly small fluctuations in environmental conditions will be of great value for the realization of more sustainable, low-power-consumption actuators and electronic systems. Herein we report an unprecedented film actuator that seemingly operates autonomously, because it responds to the adsorption and desorption of a minute amount of water (several hundred nanograms per 10mm(2)) possibly induced by fluctuations in the ambient humidity. The actuation is extremely rapid (50 ms for one curl) and can be repeated >10,000 times without deterioration. On heating or light irradiation, the film loses adsorbed water and bends quickly, so that it can jump vertically up to 10 mm from a surface or hit a glass bead. The film consists of a pi-stacked carbon nitride polymer(1), formed by one-pot vapour-deposition polymerization of guanidinium carbonate, and is characterized by a tough, ultralightweight and highly anisotropic layered structure. An actuator partially protected against water adsorption is also shown to walk unidirectionally.