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Objects can now change colors like a chameleon
PhotoChromeleon, a reversible process for changing the color of objects developed at MIT, involves a mix of photochromic dyes that can be sprayed or painted onto the surface of any object.
Computer Science and Artificial Intelligence Laboratory team creates new reprogrammable ink that lets objects change colors using light.
The color-changing capabilities of chameleons have long bewildered willing observers. The philosopher Aristotle himself was long mystified by these adaptive creatures. But while humans can’t yet camouflage much beyond a green outfit to match grass, inanimate objects are another story.
A team from MIT’s Computer Science and Artificial Intelligence Laboratory (CSAIL) has brought us closer to this chameleon reality, by way of a new system that uses reprogrammable ink to let objects change colors when exposed to ultraviolet (UV) and visible light sources.
Dubbed “PhotoChromeleon,” the system uses a mix of photochromic dyes that can be sprayed or painted onto the surface of any object to change its color — a fully reversible process that can be repeated infinitely.
PhotoChromeleon can be used to customize anything from a phone case to a car, or shoes that need an update. The color remains, even when used in natural environments.
“This special type of dye could enable a whole myriad of customization options that could improve manufacturing efficiency and reduce overall waste,” says CSAIL postdoc Yuhua Jin, the lead author on a new paper about the project. “Users could personalize their belongings and appearance on a daily basis, without the need to buy the same object multiple times in different colors and styles.”
PhotoChromeleon builds off of the team’s previous system, “ColorMod,” which uses a 3-D printer to fabricate items that can change their color. Frustrated by some of the limitations of this project, such as small color scheme and low-resolution results, the team decided to investigate potential updates.
With ColorMod, each pixel on an object needed to be printed, so the resolution of each tiny little square was somewhat grainy. As far as colors, each pixel of the object could only have two states: transparent and its own color. So, a blue dye could only go from blue to transparent when activated, and a yellow dye could only show yellow.
But with PotoChromeleon’s ink, you can create anything from a zebra pattern to a sweeping landscape to multicolored fire flames, with a larger host of colors.
The team created the ink by mixing cyan, magenta, and yellow (CMY) photochromic dyes into a single sprayable solution, eliminating the need to painstakingly 3-D print individual pixels. By understanding how each dye interacts with different wavelengths, the team was able to control each color channel through activating and deactivating with the corresponding light sources.
麻省理工研發(fā)可重新編程油墨 使用光線改變顏色 該團(tuán)隊(duì)表示，用戶可以在日常生活中對(duì)自己的物品和外表進(jìn)行個(gè)性化設(shè)置。墨水可以創(chuàng)造任何用戶可以想到的東西，從斑馬圖案到風(fēng)景或五彩火焰。研究小組通過(guò)將青色、洋紅和黃色的光致變色染料混合到一個(gè)可噴灑的溶液中來(lái)制造這種油墨。 研究小組說(shuō)，通過(guò)了解每種染料如何與不同波長(zhǎng)相互作用，研究小組可以通過(guò)激活和禁用相應(yīng)的光源來(lái)控制每一個(gè)顏色通道。研究小組說(shuō)，如果你使用藍(lán)光，它主要是被黃色染料吸收而失去活性，同時(shí)青色和洋紅燃料會(huì)保持藍(lán)色，綠光大部分被洋紅吸收，留下黃色和青色，形成綠色。 這些圖案可以通過(guò)使用一個(gè)帶有投影儀和紫外線的盒子來(lái)激活，紫外線可以使顏色從透明到可見飽和。在測(cè)試中，這個(gè)過(guò)程需要15到40分鐘，所有創(chuàng)建的模式都有很高的分辨率，可以在需要時(shí)刪除。  相關(guān)鏈接：http://news.mit.edu/2019/changing-colors-photochromeleon-mit-csail-0910 |
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mang2004 2019-09-12 04:28