We investigate light actuated micro droplet ejection from a capillary as a mean to print functional or biological materials. In an effort to overcome conventional problems in inkjet printing methods, such as aggregation and clogging issues, we implemented a jetting method to print viscous micro-droplets by laser-induced Shockwaves. The range of printable liquids with our device was significantly extended compared to conventional inkjet printers performances. In addition, the laser-induced flow focusing phenomenon allowed us to controllably generate viscous micro-droplets up to 210 mPa s with a diameter smaller than the nozzle from which they originated (200 urn). Inks containing proteins were printed without altering their functional properties thus demonstrating that this jetting technique is potentially suitable for bio-printing.
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