Caption: Demonstration of acoustic tweezers, showing polystyrene balls levitating above a loudspeaker. A ball can even be put back in position after being removed by the forceps at left. Acoustic tweezers are being developed to help grow tissue cultures and for other biomedical applications. The system comprises a loudspeaker (bottom) that emits high-frequency ultrasound, and a reflector (off screen at top). By precisely controlling the sound a stable standing wave can be formed in the cavity. This wave has fixed regions of low and high pressure, and in specific regions the force of the wave balances gravity, holding the balls aloft. This system is being designed for culturing human cells and tissues, such as cartilage, which can be grown surrounded by culture medium. The shape of the growing tissue can be precisely controlled by varying the sound. This helps to grow implants and grafts tailored exactly for their intended location. Filmed at the University of Southampton, UK, in 2016.

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Demonstrating acoustic tweezers

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Duration: 00:00:10

Frame size: 1280x720

Frame rate: 24

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