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Author Topic: Smallest manmade truss in the world from a 3D printer  (Read 657 times)

Offline zorgon

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Smallest manmade truss in the world from a 3D printer
« on: February 04, 2016, 04:04:36 PM »
Smallest manmade truss in the world from a 3D printer

Only 200 nanometers thick beams the smallest so far produced framework material. It is almost as strong as diamond.



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Only 200 nanometers thick, the struts from which a team led by Jens Bauer from Karlsruhe Institute of Technology (KIT) has created a new, high-strength framework structure. The truss-like structure consists of glassy amorphous carbon formed by the decomposition of plastic at high temperatures. Researchers created by 3-D printing an approximately five times larger version of the assembly and heated to 900 degrees this precursor. This left only the carbon back, and the workpiece dwindled to its final dimensions. In the test showed that the material is extremely strong and is surpassed in its strength in relation to specific gravity only by diamond.



Quote
The size of such structures has been limited down - simply because you only can make objects on scales larger than a micron of the available 3-D techniques. When photolithography is cured to from a resin having a UV laser whose wavelength limits the size of the structures. So went to the Working Group of the KIT. However, the final plastic parts are mechanically relatively weak. The glassy carbon on the other hand, which remains after heating is about ten times as stiff - and the framework structure has only about one-third the density of water.

To prevent the structure during shrinking distorted, the researchers led by farmers place their pieces on a pedestal so that it can move independently from the substrate - the result is a smaller by about 80 per cent of the original version. In addition, the materials thus produced have interesting electrical and optical properties: Glassy carbon can be semiconducting and is a metamaterial. Such materials behave against electromagnetic radiation having wavelengths on the scale of the structural elements very unusual and interesting for optical components. In addition, the pore structure makes its use as a nano-filter, but also as a catalyst support with an extremely high internal surface area possible.

http://www.spektrum.de/news/kleinstes-fachwerk-der-welt-aus-dem-3-d-drucker/1397984

 


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