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This is Scientific American 60 Second Science, I am Karen Hopkin, this will just take a minute.
Every year, about 10 million tons of paper winds up in American landfills and incinerators, which is not only wasteful1 but adds CO2 to the atmosphere. Recycling helps, but even that material has to be repulped and paper-ized before you can use it to print out that recipe you’ll never make. But what if you could wipe the page clean and use it again?
Light amplification2 by stimulated3 emission4 of radiation to the rescue. A new study shows that laser light can erase5 the toner from a piece of printed paper. The approach appears in the Proceedings6 of the Royal Society A.
Taking a page from the art-restoration handbook, scientists sampled a variety of light sources to see if any could be used to strip the ink from laser-printed documents without damaging or discoloring the paper. UV and infrared7 were too harsh. But a bright green laser applied8 in 4 nanosecond pulses vaporizes the print, leaving paper that looks as good as new.
Such unprinters will probably run about 30,000 bucks9, so they probably won’t catch on for home use. But people in the recycling world might find that the green laser fits the bill—for making paper that’s really green.
Thanks for the minute, for Scientific American 60 Second Science, I am Karen Hopkin~
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1 wasteful | |
adj.(造成)浪费的,挥霍的 | |
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2 amplification | |
n.扩大,发挥 | |
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3 stimulated | |
a.刺激的 | |
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4 emission | |
n.发出物,散发物;发出,散发 | |
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5 erase | |
v.擦掉;消除某事物的痕迹 | |
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6 proceedings | |
n.进程,过程,议程;诉讼(程序);公报 | |
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7 infrared | |
adj./n.红外线(的) | |
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8 applied | |
adj.应用的;v.应用,适用 | |
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9 bucks | |
n.雄鹿( buck的名词复数 );钱;(英国十九世纪初的)花花公子;(用于某些表达方式)责任v.(马等)猛然弓背跃起( buck的第三人称单数 );抵制;猛然震荡;马等尥起后蹄跳跃 | |
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