Researchers at the Delft University of Technology in the Netherlands printed the bacteria on precise lines in 3D printing, "taking away" the oxygen atoms of graphene oxide to make graphene-like materials. The research has been published in the American Chemical Society's Journal of Synthetic Biology and presented at the Microbiology Annual Conference in Edinburgh, UK in April.
A thin film of graphite carbon atoms is the lightest and hardest material available today. This property makes it the hottest material available today, but it is also very difficult to obtain. In general, the manufacture of good quality graphene requires a lot of money, and the process is not only slow, but also requires many toxic compounds. Although there is still a long way to go to make graphene in a simple way, the research team at Delft University of Technology has developed a 3D printing method to produce a material very similar to graphene.
The key to this new technology is to print bacteria in 3D. The researchers found that bacteria can accumulate in a 3D printed precision array and convert graphene oxide into a material similar to graphene. The principle is that bacteria can consume oxygen atoms and reduce graphene oxide during metabolism. This reduction process can also be carried out by heating or compound treatment, but the researchers say that the method of using bacteria is cheaper and has less environmental impact.
The research team modified a desktop 3D printer to print bacteria on a straight line that was only 1 mm wide. Printing bacteria in 3D is not an amazing feat, but the researchers mixed E. coli with a colloid produced by an algae, and printed such a mixture on a plate containing calcium ions, so that when the colloid hits calcium ions, it will be Hardens, thereby allowing the bacteria to be fixed in the exact position.
The research team believes that in this way we can finally print the Shewanella oneidensis bacteria that survive in an oxygen-deficient, heavy metal-rich environment in 3D printing, and this type of bacteria can make the physiological properties of graphene oxide reduction. Graphene. It is worth mentioning that this method is simpler to operate than the general method of manufacturing graphene, and does not need to be carried out at extreme temperatures or use toxic chemicals.
Anne Meyer, Ph.D., of Nanobiosciences at Delft University of Technology, said that the more thoroughly we can reduce graphene oxide, the closer it is to graphene. And the process is very simple, as long as it can be carried out in room temperature water with sugar. As long as the technology of 3D printing bacteria continues to improve, it can be applied to the surface of graphene oxide to make it less conductive, which makes it easier to accurately deposit the liquid in graphene oxidation. On the object.
In the future, researchers hope to apply this technology to materials contained in lunar dust, which will help build electronic instruments in space.
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