Rewritable Paper Needs No Inks
Feb-07-17
Researchers have developed a paper that can be printed with UV light and re-written multiple times.The rewritable paper relies on a thin coating of nanoparticles—which can be applied to traditional paper. The coating itself consists of nanoparticles made of Prussian blue, a blue pigment that becomes colorless when it gains electrons; and titanium dioxide, which accelerates chemical reactions when exposed to UV light.
The paper can be printed on by exposing it selectively to UV light, resulting in blue text on a colorless background, and the text will remain in place for at least five days before fading back to blue. The text can also be ‘erased’ more quickly by heating the paper, and the coated paper can be re-written up to 80 times.
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Printed books may live forever, if they can be printed affordably on demand. Could this UV-printing (Feb-7-17) be used with Radiation technology (Sep-10-16) to print a whole closed book? Or each page is reactive with a unique wavelength. An “X-ray-laser” prints a closed book page by page.
Posted by Uolevi Kattun on February 9, 2017
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Printed books may live forever, if they can be printed affordably on demand. Could this UV-printing (Feb-7-17) be used with Radiation technology (Sep-10-16) to print a whole closed book? Or each page is reactive with a unique wavelength. An “X-ray-laser” prints a closed book page by page.
Posted by Uolevi Kattun on February 9, 2017
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