The dual-engine micro-nano machine is like a penguin and is expected to play a major role in cancer diagnosis and environmental testing.
November 21, 2018 Source: Health News
Window._bd_share_config={ "common":{ "bdSnsKey":{ },"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":" 0","bdSize":"16"},"share":{ }};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')) .src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)];Professor He Qiang, key laboratory of Microsystems and Microstructure Manufacturing of Ministry of Education, Harbin Institute of Technology, successfully developed the world's first twin-engine artificial micro-nano machine, which is expected to be widely used in biomedicine, anti-tumor drugs and environmental testing. The result, titled "Double Bubble Driven Kayak," was published in the latest issue of the American Chemical Society and was selected as the cover paper for the issue.
The chemically driven micro/nano machine is a micro-nano system capable of converting chemical energy in the surrounding environment into its own mechanical motion. It is a hot research topic in the fields of materials, robotics, physics, chemistry, and biomedicine. How do you simulate a two-engine power mode that is ubiquitous in nature, like a penguin swimming in the water, and then artificially synthesize a dual-engine-driven micro-nano machine? The He Qiang team prepared a hollow dumbbell-like hollow manganese dioxide colloidal particle by chemical hydrothermal synthesis, which can catalyze the decomposition of hydrogen peroxide fuel and generate a pair of oxygen bubbles at the waist of the particle, realizing self-driving at low Reynolds number. motion. Because this movement is similar to a single-handed kayak with a single paddle and two leaves, it is aptly called a "colloidal kayak." Due to the special structure of the dumbbell shape, the reaction force generated by the growth and release of double bubbles has a net force on the tangential axis (long axis) and the radial axis (short axis) of the "colloidal kayak". Movement provides the driving force, while the latter affects its direction of motion.
Through the statistical analysis of the synchronous or non-synchronous growth and frequency change of double bubbles, and the simulation of the surrounding fluid field changes during bubble growth and release, He Qiang team also established a physical model based on bubble growth kinetics and particle motion equations. , clarified its movement mechanism.
The observations show that the double bubble drive has higher maneuverability than the single bubble drive mode. Experts pointed out that this latest achievement has potential for exploring the design methods of dual-engine micro-nano machines, mimicking the magical natural system functions, as well as the identification of cancer cells, the delivery of anti-tumor drugs, and nano-surgery. Practical value.
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