Fluid jets are normally made by forcing liquid through a nozzle, such as in a squirt gun or a syringe. But in the 10 July Physical Review Letters, researchers report a way to induce a fluid jet to burst from an isolated droplet. The team placed a liquid droplet on a surface and blasted it with focused surface acoustic waves–nano-sized versions of the ground-shaking waves from earthquakes–causing the droplet to shoot upward in a narrow stream. The researchers believe the technique could be useful in drug delivery, biomedical research, and inkjet printing.
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