Abstract According to physicist organization network on December 27 reported that recently, Japan's Aoyama Gakuin University in a study, the first time with a laser to manipulate graphene magnetic levitation movement, by changing the temperature of graphene can change its suspension height, Control the direction of motion and let it rotate, and...
According to a report by the physicist organization network on December 27, recently, in a study, Aoyama Gakuin University of Japan realized the use of laser to manipulate the magnetic suspension of graphene. By changing the temperature of graphene, it can change its suspension height and control. Move the direction and let it rotate, and demonstrate that the sun can also rotate the graphene. This achievement is of great significance for the study of light-driven human transport vehicles and is expected to bring a new type of light energy conversion system. Related papers were published in the recently published Journal of the American Chemical Society. Magnetic levitation has proven to be effective for everything from trains to frogs, but so far there is no magnetically suspended brake that converts external energy into kinetic energy. The researchers explained that the magnetic levitation is due to the diamagnetic nature of the object, which repels the magnetic field. All substances have varying degrees of diamagnetism. Normally, the diamagnetism is weak and it is impossible to let the object float. Only when the diamagnetic strength of the object exceeds its paramagnetism (attracted by the magnetic field), the combined magnetic force is the repulsive force and the repulsive force is greater than the gravity, it may float. Graphene is one of the most diamagnetic materials.
The suspension height of the antimagnetic object depends on the applied magnetic field and the diamagnetic nature of the material itself, and the floating position can be controlled in advance by changing the applied magnetic field. So far, the use of external stimuli such as temperature, light, sound and other factors to change the diamagnetic properties of materials, thereby controlling the movement of magnetic levitation objects, no one can do it.
“The most important point of this research is the realization of real-time motion control technology, which promotes a suspended antimagnetic object without contact for the first time.†The paper co-author and Aoyama Jiro, professor of Aoyama Gakuin University, said, “Because the technology is simple And basically, it is expected to be used in many areas of daily life, such as transportation systems, recreational activities, light brakes, and light energy conversion systems."
In the experiment, the researchers demonstrated that the laser was used to control the temperature so that a small piece of disk-like graphene was suspended above a piece of neodymium magnet of neodymium iron boron (NdFeB). The suspended height of graphene decreases with increasing temperature and vice versa. The researchers explained that changing the temperature changes the magnetic susceptibility of graphene or the extent to which it is magnetized by an applied magnetic field. At the atomic scale, the photothermal effect of the laser increases the number of heat shock electrons in the graphene. The more the heat shock electrons, the weaker the diamagnetic resistance of the graphene, and the lower the height of the suspension.
Aiming the laser at the center of the graphene disc controls the height, and the aiming edge allows it to move and rotate. Because changing the temperature distribution changes the magnetic susceptibility distribution, causing the repulsion of the graphene to be unbalanced in the magnetic field to move in the same direction as the beam motion. Their rotating device is also rotated in the sun and rotates at speeds in excess of 200 rpm. This is very useful for developing light-driven turbines.
Researchers predict that the ability to amplify this laser-controlled magnetic levitation motion is expected to drive the development of magnetic levitation brakes and photothermal solar energy conversion systems, as well as low-cost environmentally friendly power generation systems and new optical drive transportation systems.
Abe said: "At present, we are planning to develop a magnetic levitation turbine blade suitable for this system. There may be friction to destroy the rotation, so we want to develop an efficient method with a technology related to MEMS (Micro Electro Mechanical Systems). Light energy conversion system. In terms of brakes, magnetic suspension graphene can transport any object that is close to its own weight. If you can successfully amplify this system, it is not a dream to develop personal transportation."
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