Creating 3D objects with sound
https://techxplore.com/news/2023-02-3d.html
"multiple acoustic shaped high-frequency ultrasound holograms generate pressure fields with which solid particles, glass or gel (or hydrogel) beads and biological cells printed... 3D object from smaller building blocks in single step... acoustic holograms—3D-printed plates, encode specific sound field which assemble materials into 2D patterns... cell cultures and tissues in 3D... gentle enough for biological cells... can travel deep into tissue... remotely manipulate and push cells without harm"
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