Crystal actuator based on a thermal phase transition and photothermal effect
Crystal actuator based on a thermal phase transition and photothermal effect
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DOI：
10.1039/d0tc00007h
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发表时间：
2020-04-14
影响因子：
6.4
通讯作者：
Koshima, Hideko
中科院分区：
文献类型：
--
作者：
Hagiwara, Yuki;Taniguchi, Takuya;Koshima, Hideko
机械响应材料已经越来越多地被探索，主要是在光异构化方面。在这里，我们报告了由热相变和光热效应引起的水杨醛苯胺晶体的弯曲驱动。长棒状晶体在转变温度附近反复加热和冷却时可逆地弯曲。在紫外光和可见光照射下，由于光热效应的影响，在有相变和无相变的情况下，也可以产生弯曲运动。晶体边缘照射部位的光热温升导致晶体表面附近的局部伸长，并因厚度方向的温度梯度而导致轻微弯曲。这种弯曲运动被长棒状晶体另一端的尖端位移放大。最后，25 Hz的高频弯曲驱动，实现了脉冲紫外照射。因此，这项研究的结果表明，光热效应的基础上的机械晶体发展的潜力和通用性。
Mechanically responsive materials have been increasingly explored, mainly in terms of photoisomerization. Here, we report the bending actuation of salicylideneaniline crystals induced by a thermal phase transition and photothermal effect. Long rod-like crystals bent reversibly on repeated heating and cooling near the transition temperature. The bend motion was also induced by the photothermal effect under ultraviolet (UV) and visible light irradiation, with and without phase transition. The photothermal-based temperature rise at the irradiated site of the crystal edge resulted in localised elongation near the crystal surface and slight bending due to the temperature gradient in the thickness direction. This bending motion was amplified by tip displacement at the opposite end of the long rod-like crystal. Finally, high-frequency bending actuation of 25 Hz was achieved by pulsed UV irradiation. Thus, the results of this study demonstrate the potential and versatility for mechanical crystal development based on the photothermal effect.