More research developments on printing very, very small! 3D printing builds a nanowall, shared on 3ders.org:
3D printing in nanofabrication could make processes cheaper, faster, and reduce waste. Armed with pre-patterned substrates and 3D printing technology, researchers may be able to realize new complexity in nanoscale 3D fabrication. The most recent development in 3D printing on the nano-scale comes from a team led by Ho-Young Kim, a professor at Seoul National University in South Korea.
Last week, in a paper entitled “Toward Nanoscale Three-Dimensional Printing: Nanowalls Built of Electrospun Nanofibers,” Minhee Lee and professor Kim showed that free-standing nanowalls and other nano-scale 3D objects may be built using 3D printing. They introduce a new method of fabrication which involves depositing electrospun polymer nanofibers in a precise, repetitive manner.
Electrospinning is a technique which uses an electrical charge to draw a micro or nano-scale fibers from a liquid. It’s a relatively cheap and easy way to produce polymer nanojets which may be used to create nanoscale fibers. According to professor Kim, nano-scale fiber streams are often so chaotic that it is difficult – if not impossible – to control individual fibers. In their recent work such nano-scale fiber streams are kept in relative order using a thin metal electrode line.
Using this line, the polymer nanojet may be stacked to form a wall-like structure. The team showed that tension in the polymer fiber may be balanced using the electrostatic interaction of the fiber and a metal ground, and that the length of a nanowall may be controlled translating the substrate….
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