Light-driven locomotion of a centimeter-sized object at the air-water interface: effect of fluid resistance.
Light-driven locomotion of a centimeter-sized object at the air-water interface: effect of fluid resistance.
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DOI：
10.1039/c9ra01417a
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发表时间：
2019-03-12
期刊：
影响因子：
3.9
通讯作者：
Fujii, Syuji
中科院分区：
文献类型：
--
作者：
Kawashima, Hisato;Shioi, Akihisa;Archer, Richard J.;Ebbens, Stephen J.;Nakamura, Yoshinobu;Fujii, Syuji
具有光热特性的厘米大小的平头图钉可以通过简单的近红外激光在水面上移动。使用光作为外部刺激可以远程控制其运动的时间、方向和速度。已经阐明的是，空气-水界面处销的垂直方向会影响运动的摩擦力，从而影响速度和加速度。放置在水面上且针尖向上（突出到空气相中的点）的针在激光照射一脉冲后平均移动距离为 5.3 ± 2.9 cm，而放置在针尖向下（突出到水相中的点）的针则移动 2.0 ± 1.4 cm。与将销钉朝下放置在水面上时相比，将销钉朝上放置在水面上时的速度和加速度更大。对针运动进行的数值分析得出的结论是，行进距离、速度和加速度的差异是由于针点运动过程中气相和水相的流体阻力不同造成的。这种通过光远程控制小物体运动的演示可以开辟广泛的未来运输应用。具有光热特性的厘米大小的平头图钉可以通过简单的近红外激光在水面上移动。
A centimeter-sized flat-headed push pin with photothermal properties can be moved on a water surface by a simple near-infrared laser. Using light as an external stimulus allows for the remote control of the timing, direction and velocity of its locomotion. It has been clarified that the vertical orientation of the pin at the air–water interface affects the friction of locomotion, and therefore velocity and acceleration. The pin placed on a water surface with a pin point upward (a point protruding into air phase) moved an average distance of 5.3 ± 2.9 cm following one pulse of laser irradiation, and that placed with a pin point downward (a point protruding into water phase) moved 2.0 ± 1.4 cm. The velocity and acceleration were larger when the pin was placed on the water surface with a pin pointing upward, compared to when placed with the pin pointing downward. Numerical analysis conducted for the locomotions of the pin concluded that the differences in traveling distance, velocity and acceleration were due to the difference in fluid resistance of the pin point in air and water phases during their locomotion. This demonstration of remote control of the motion of small objects by light can open up a wide range of future transport applications. Centimeter-sized flat-headed push pin with photothermal properties can be moved on a water surface by a simple near-infrared laser.
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