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SSS 2009-03-13

时间:2010-05-17 06:30来源:互联网 提供网友:木渐浅。   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.

If you get a scratch, your skin can heal itself. But if your car gets scratched, it stays scratched. Scientists at the University of Southern Mississippi think they may have solved that problem. They’ve developed a new material that can self-heal scratches when exposed to sunlight. They published this research in the March 13th edition of the journal Science.

The new technology first takes polyurethane—the coating on many cars. Then researchers added chitosan—that’s a key polymer in crab1 and shrimp2 shells. The final bit thrown into the mix are minute amounts of oxetane rings, with three atoms of carbon and one of oxygen.

The researchers are trying to mimic3 natural processes. Here’s how it works. When there’s a scratch, damaging the molecule4, the oxetane ring opens. It has two reactive ends. In sunlight, chitosan breaks into two chains and generates free radicals5. Then those chitosan chains link up with the reactive ends of the oxetane, filling in the scratch.

Researchers say this technique is much simpler and more cost-efficient than other attempts at self-healing. So maybe in the future, when your car gets scraped, it’ll be all healed up before you have to spend any of your hard earned scratch.

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Cynthia Graber.

 


点击收听单词发音收听单词发音  

1 crab xoozE     
n.螃蟹,偏航,脾气乖戾的人,酸苹果;vi.捕蟹,偏航,发牢骚;vt.使偏航,发脾气
参考例句:
  • I can't remember when I last had crab.我不记得上次吃蟹是什么时候了。
  • The skin on my face felt as hard as a crab's back.我脸上的皮仿佛僵硬了,就象螃蟹的壳似的。
2 shrimp krFyz     
n.虾,小虾;矮小的人
参考例句:
  • When the shrimp farm is built it will block the stream.一旦养虾场建起来,将会截断这条河流。
  • When it comes to seafood,I like shrimp the best.说到海鲜,我最喜欢虾。
3 mimic PD2xc     
v.模仿,戏弄;n.模仿他人言行的人
参考例句:
  • A parrot can mimic a person's voice.鹦鹉能学人的声音。
  • He used to mimic speech peculiarities of another.他过去总是模仿别人讲话的特点。
4 molecule Y6Tzn     
n.分子,克分子
参考例句:
  • A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈̬f婘̬ 妈̬成的。
  • This gives us the structural formula of the molecule.这种方式给出了分子的结构式。
5 radicals 5c853925d2a610c29b107b916c89076e     
n.激进分子( radical的名词复数 );根基;基本原理;[数学]根数
参考例句:
  • Some militant leaders want to merge with white radicals. 一些好斗的领导人要和白人中的激进派联合。 来自《简明英汉词典》
  • The worry is that the radicals will grow more intransigent. 现在人们担忧激进分子会变得更加不妥协。 来自辞典例句
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