Scientists from Italy, Germany and Spain have collaborated to design a new micro-gear driven by microparticles. The microparticles push themselves forward with fuel around the hydrogen peroxide solution, just like micromotors, which push the microgears as they enter the teeth. In the future, such micro gears are expected to be the basic building blocks of automatic micromachines. Related papers were published in the nano and micro science and technology magazine "Small". Modern nanotechnology can create micro and nanoscale materials that are highly controllable in structure and morphology. Recently, researchers have begun to explore the possibility of “giving life†to these structures so that they can advance themselves. The first author of the paper, Claudio McGee of the University of Rome in Italy, said that they are developing a class of advanced materials called “active substances†that can convert some built-in energy directly into motion. According to a recent report by the physicist organization network, the "active material" micromotor in this study is a 5 micron-sized Janus (two-faced god in Roman mythology) particle with two asymmetric faces, one of which When coated with a layer of platinum, when immersed in a hydrogen peroxide solution, it will only move in one direction and advance along the gear side between the teeth. The gear is about 8 microns and has 6 teeth for up to 6 Yanus particles. Researchers say that in the past there have been similar methods of generating active motion using collective movements of bacteria or artificial micro-swimmers, but high concentrations of bacteria or particles are required, and it is difficult to control their movement. The biggest advantage of the new method is that the required particle concentration is low and the motion height is determined. They found that when the number of Janus particles embedded in the micro-gear teeth is 1 to 3, the gear rotation speed increases linearly with the increase of the number of particles; after the particles increase to 4, the gear speed slows down, probably because of the increased particle consumption. The hydrogen peroxide fuel was used to reduce the overall velocity of all particles. Roberto Di Leonardo, co-author of the paper and the Italian National Research Council, said that their research proved the interaction in the “active matter†system, opening up a highly reproducible and controllable micromachine. New approach. They will also explore whether the micromotor speed can be controlled by adjusting the hydrogen peroxide concentration, as speed control is the key to using micromachines in labs and other equipment. Concerned about surprises Medium Density Fiberboard,Medium Density Board,Medium Density Fibre Board,Mdf Fiberboard Linyi Fengzhize Trading Co., Ltd. , https://www.fengzhize.com