Sound can be used to print droplets that couldn't be printed before

Researchers have developed a new printing technology that uses sound waves to control the size of liquid droplets independent of fluid viscosity. This approach could greatly broaden the types of liquids, including biopharmaceuticals, that can be printed drop-on-demand. The researchers used sound waves to generate a highly confined force at the tip of the printer nozzle, which pulls the droplet. The higher the amplitude of the sound waves, the smaller the droplet size.

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