Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan.
J Am Chem Soc. 2012 Dec 26;134(51):20593-6. doi: 10.1021/ja310365k. Epub 2012 Dec 14.
Graphite has been known as a typical diamagnetic material and can be levitated in the strong magnetic field. Here we show that the magnetically levitating pyrolytic graphite can be moved in the arbitrary place by simple photoirradiation. It is notable that the optical motion control system described in this paper requires only NdFeB permanent magnets and light source. The optical movement is driven by photothermally induced changes in the magnetic susceptibility of the graphite. Moreover, we demonstrate that light energy can be converted into rotational kinetic energy by means of the photothermal property. We find that the levitating graphite disk rotates at over 200 rpm under the sunlight, making it possible to develop a new class of light energy conversion system.
石墨一直被认为是一种典型的抗磁性材料，可以在强磁场中悬浮。在这里，我们展示了通过简单的光照射，可以将悬浮的热解石墨在任意位置移动。值得注意的是，本文所描述的光学运动控制系统仅需要 NdFeB 永磁体和光源。光运动是由石墨的磁热诱导变化驱动的。此外，我们证明了光能可以通过光热特性转化为旋转动能。我们发现，在阳光照射下，悬浮的石墨盘可以以超过 200rpm 的速度旋转，这使得开发一种新型的光能转换系统成为可能。
