Nankai University revealed on the 19th that the joint research team of Professor Chen Yongsheng and Tian Jianguo of the university had obtained a special graphene material through three years of research. The material can be driven by a variety of light sources including sunlight, and its driving force is more than a thousand times that of conventional light pressure. The results of this research made it possible for "light moving" flights. Spacecraft is an important tool for humans to explore the universe, and the problem of power sources has always been that people cannot go further. At present, almost all aerospace and spaceflights are chemically driven, that is, by injecting combustion chemicals to obtain driving force. Direct light-driven flight is the dream of the scientific community and the aviation industry for many years. It is also a problem.
The graphene material developed by Prof. Chen Yongsheng's team can efficiently drive the flight under the illumination of various light sources, including sunlight, under the combined effect of its special macroscopic structure and the special electronic structure of graphene itself.
In the Key Laboratory of Functional Polymer Materials at the Department of Education, Nankai University, the reporter saw that the researchers placed a 4-milligram round wafer-shaped 3D graphene material that resembles a “sponge†into a vacuum tube. Under the "push" of different light sources, the "sponge" instantaneously moves horizontally or vertically, with a maximum movement distance of up to 40 cm.
According to the researchers, the light sources used in the experiments are relatively weak, such as ordinary lasers and xenon lamps. Experiments have found that the wavelength of the light source is inversely proportional to the driving force generated by the graphene material. That is, the shorter the wavelength, the greater the driving force generated by the material. Through outdoor experiments, researchers found that sunlight can also drive the graphene material to move.
“This is what we have learned. So far, the scientific community has used the light for the first time to promote a macroscopic object and to achieve a macroscopic drive.†Professor Chen Yongsheng said that through quantitative measurements, the force generated by this graphene material under light conditions is traditional. More than a thousand times light pressure. For a load of 500 kg, if a driving windsurfing board based on this graphene material is used, the theoretically obtained driving force can at least enable it to reach an acceleration of 0.09 meters per second.
In addition to the observation that this light directly drives the flight, the research team has conducted a large number of experiments and proposed a new driving mechanism, namely that this material obtains the corresponding driving force by emitting a large amount of electrons under the action of light. This particular type of drive is obtained through electronic jets, completely different from conventional chemical rockets.
At present, Professor Chen Yongsheng’s team is conducting further research and verification on this mechanism. Therefore, this material can also be used as a convenient source of electron emission.
It is understood that the paper introducing this achievement was published online in the internationally renowned academic journal Natural-Optical. The latest issue of the famous British science magazine "New Scientist" wrote a review of this achievement.
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