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Engineers have long experimented with replicating these so-called structural colors in synthetic materials, and now Sunghoon Kwon's team at Seoul National University in South Korea has managed it. Their M-Ink can be used to produce any color in the visible spectrum and could lead to a new method of cheap and fast full-color printing. M-Ink contains three ingredients: magnetic nanoparticles 100 to 200 nanometres across, a solvation liquid, and a resin. The nanoparticles disperse throughout the resin, giving the ink a brown appearance. But when an external magnetic field is applied, the nanoparticles immediately snap to the magnetic field lines, forming chain-like structures. (Source: New Scientist) |
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