A precision arm for miniature robots
https://techxplore.com/news/2023-01-precision-arm-miniature-robots.html
"ultrasonically actuated glass needle attached to robotic arm to pump and mix minuscule amounts of liquid and trap particles... combining conventional robotics and microfluidics... thin, pointed glass needle and a piezoelectric transducer that causes the needle to oscillate... 3D pattern of multiple vortices depends on oscillation frequency, so can be controlled accordingly... sorting objects, capture fish embryos and biological cells, introducing DNA into individual cells, additive manufacturing and 3D printing"
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