Thinking the possibilities
Acoustic Levitation Used to Build Complex Structures in Mid-Air
New Scientist, Matthew Sparkes, June 29, 2022
A system developed by researchers at Spain's Public University of Navarre incorporates a robotic arm that generates sound waves to levitate, rotate, and move objects in order to build complex structures in mid-air without touching the parts. The robotic arm, which employs 40-kilohertz sound waves, was used to build objects by manipulating droplets of glue or resin and small sticks. After assembly, a beam of ultraviolet light was applied to set the glue or cure the resin. The technique is similar to three-dimensional printing but can be used on liquids, powders, and hot or hazardous substances. .... '
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