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3D microtechnology design inspired by origami

Posted: 19 Nov 2014 ?? ?Print Version ?Bookmark and Share

Keywords:University of Twente? origami? microtechnology? 3D?

The immense contribution microtechnology has brought forth as regards revolutionising our lives cannot be denied, as in the case of accelerometer in smartphones or the sensor in car airbags. However, microtechnology as we know it is not a dead-end. The present applications are still in 2D, where everything is placed on a thin layer of glass or silicon, which is used in pure form for the production of semiconductor chips.

Antoine Legrain, doctoral degree candidate at the University of Twente, has developed a method to design microtechnology in three dimensions. The existing mini-electronics in computers and smartphones, for example, is strongly two-dimensional and is built on a very thin layer. In a micro world in 3D, more transistors can be inserted in an enclosure, so we get more memory or faster processors. Legrain was inspired in his work by Origami, the Japanese art of folding, which he applies at the micro level. In this case, he works with structures that have the diameter of a grain of salt.

"A 3D micro-world offers huge benefits," said Legrain. "Besides electronics, we can also miniaturise 3D mechanical objects from the macro-world."

The technique that Legrain describes in his doctoral thesis can form the basis for a novel 3D production technique that avoids the limitations of present 2D microtechnology. One of the most elegant ways to create 3D structures, is by means of folding. The epitome of this technique is origami, the Japanese art of folding, which he examined in detail. In his doctoral thesis, he showed that origami can be applied at all kinds of levels: from solar panels and robots to now, therefore, the special application of origami with a diameter of 200um (0.2mm), the size of a grain of salt.

"Of course, we cannot fold at the micro scale with our fingers, and tricks are required," said Legrain. "I use the surface tension of liquids to fold microstructures. We do this by evaporating small droplets of water. The droplets are applied to flexible structures, which consequently fold up. If we design it properly, the structure remains folded after the evaporation because the parts remain stuck together. And then you've created a 3D structure."

Legrain described in his doctoral thesis that the easiest method for applying small droplets is with a syringe. "This method is less suitable for mass production, however. Therefore, we examined whether it is possible to force the droplet through a small channel on the reverse of the structure to be folded. This was successful, although the large-scale folding of thousands of structures at the same time is still a long way off. When folding 3D structures we must avoid folding them totally flat. This can easily be achieved by carefully choosing the order of folding, or by using special touches."

Origami-inspired 3D microtechnology design

In his doctoral thesis, Legrain showed various examples of the latter technique. "Folded mechanical structures are interesting, but have a limited application. We have therefore examined whether we can make electrical connections to the movable parts. That is possible if the connections are well designed. For mass production, it is essential that thousands of structures can be folded at the same time. By immersing a container with thousands of ribbons in water and then letting it dry, it was possible to fold them in one go. We believe that it is possible to fold more complex structures in the same manner, but this still requires detailed follow-up research. The prospects are promising, however."

Origami-inspired 3D microtechnology design

Origami-inspired 3D microtechnology design

Origami-inspired 3D microtechnology design





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