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Scientists from Italy, Germany and Spain collaborated to design a new type of micro-gear driven by micro-particles. The microparticles use the surrounding hydrogen peroxide solution as a fuel to propel themselves forward, just like micro motors. When they enter the teeth, they push the micro-gears to rotate. In the future, this micro-gear is expected to be the basic component of an automatic micro-machine. The related papers were published in the journal "Small" in the nano and micro science and technology magazine.
Modern nanotechnology can create micro- and nano-scale materials that are highly controllable in structure and morphology. Recently, researchers have begun to explore whether they can “live†these structures and allow them to self-promote. The author of the paper, Claudio McGee of the University of Rome, Italy, said that they are developing a class of advanced materials called "active substances" that can directly convert some of the built-in energy into sports.
According to a recently reported physicist's organization network, the “active material†micromotor in this study is a 5 μm-sized Janus (two-sided god in Roman mythology) particle with two asymmetrical faces, one of which A layer of platinum is applied. When they are immersed in a hydrogen peroxide solution, they will only move in one direction, and they will advance along the side of the gear and get stuck between the teeth. The gear is about 8 microns, has 6 teeth and can accommodate up to 6 Janus particles.
Researchers say that similar methods have been used in the past to produce active movements using the collective movement of bacteria or artificial micro-carriers, but they require very high concentrations of bacteria or particles 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 movement height is determined. They found that when the number of Janus particles embedded between the teeth of the micro-gears is between 1 and 3, the gear rotation speed increases linearly with the number of particles; after the number of particles increases to 4, the gear speed slows down, probably because of increased particle consumption. The hydrogen peroxide fuel is exhausted, reducing the overall speed of all particles.
Roberto Di Leonardo, who co-author of the paper and the Italian National Research Council, said that their research proved that the interaction in the "active material" system opens up the possibility of creating highly repeatable, controllable micromachines. New approach. They will also explore whether it is possible to control the micromotor speed by adjusting the hydrogen peroxide concentration, because speed control is the key to using micromachines for lab labs and other equipment. (Reporter Chang Lijun)
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