Vapomechanically Responsive Motion of Microchannel-Programmed Actuators
Vapomechanically Responsive Motion of Microchannel-Programmed Actuators
复制标题
微通道编程执行器的蒸汽机械响应运动
DOI：
10.1002/adma.201702231
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发表时间：
2017
影响因子：
29.4
通讯作者：
Wang Juan
中科院分区：
文献类型：
--
作者：
Zhang Lidong;Naumov Pance;Du Xuemin;Hu Zhigao;Wang Juan
对外部刺激做出快速可逆响应的材料目前是真实的世界应用中致动器的首选。在这里，描述了一系列制造为单层或双层元件的可编程致动器，这些致动器可以可逆地响应丙酮蒸气的微小浓度。通过使用模板，微通道结构被复制到两个高弹性聚合物，聚偏氟乙烯（PVDF）和聚乙烯醇的表面上，以诱导暴露于丙酮蒸气后的手性卷曲。蒸汽机械卷取是可逆的，并且可以重复进行超过100次而没有明显的疲劳。如果将它们浸入液态丙酮中，致动器就会被溶剂饱和，暂时失去运动性，但在溶剂蒸发后几秒钟内就会恢复形状和活性。丙酮从PVDF层的解吸速度比其吸附速度快四倍，由单个PVDF层组成的致动器即使在几天后也能保持在丙酮浸泡的滤纸上移动的能力。这种智能材料的可控和可再现的传感能力可用于驱动软机器人中的动态元件。
Materials that respond rapidly and reversibly to external stimuli currently stand among the top choices as actuators for real‐world applications. Here, a series of programmable actuators fabricated as single‐ or bilayer elements is described that can reversibly respond to minute concentrations of acetone vapors. By using templates, microchannel structures are replicated onto the surface of two highly elastic polymers, polyvinylidene fluoride (PVDF) and polyvinyl alcohol, to induce chiral coiling upon exposure to acetone vapors. The vapomechanical coiling is reversible and can be conducted repeatedly over 100 times without apparent fatigue. If they are immersed in liquid acetone, the actuators are saturated with the solvent and temporarily lose their motility but regain their shape and activity within seconds after the solvent evaporates. The desorption of acetone from the PVDF layer is four times faster than its adsorption, and the actuator composed of a single PVDF layer maintains its ability to move over an acetone‐soaked filter paper even after several days. The controllable and reproducible sensing capability of this smart material can be utilized for actuating dynamic elements in soft robotics.