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文章来源:未知 文章作者:enread 发布时间:2016-04-06 06:41 字体: [ ] 
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a finely 1 carbon nanotube thin film has the potential to act as a thermoelectric power 2 that captures and uses waste heat, according to researchers at the energy department's national renewable energy laboratory (nrel). the research could help guide the manufacture of thermoelectric devices based on either single-walled carbon nanotube (swcnt) films or composites containing these nanotubes. because more than half of the energy consumed worldwide is rejected primarily as waste heat, the idea of thermoelectric power generation is emerging as an important part of renewable energy and energy-efficiency 3.
 
"there have not been many examples where people have really looked at the intrinsic thermoelectric properties of carbon nanotubes and that's what we feel this paper does," said andrew ferguson, a research scientist in nrel's chemical and materials science center and co-lead author of the paper with jeffrey blackburn.
 
the research, "tailored semiconducting carbon nanotube networks with enhanced thermoelectric properties," appears in the journal nature energy, and is a 4 between nrel, professor yong-hyun kim's group at the korea advanced institute of science and technology, and professor barry zink's group at the university of denver. the other authors from nrel are 5 avery (now an assistant professor at 6 state university of denver), ben zhou, elisa 7, rachelle ihly, kevin mistry, and sarah guillot.
 
nanostructured 8 9 have demonstrated promise for improving the performance of thermoelectric devices. inorganic materials can run into problems when the 10 needs to be lightweight, flexible, or irregularly shaped because they are often heavy and lack the required 11. carbon nanotubes, which are organic, are 12 and more flexible.
 
how useful a particular swcnt is for thermoelectrics, however, depends on whether the nanotube is 13 or a semiconductor, both of which are produced 14 in swcnt syntheses. a metallic nanotube would harm devices such as a thermoelectric generator, whereas a semiconductor nanotube actually enhances performance. furthermore, as with most optical and electrical devices, the electrical band gap of the semiconducting swcnt should affect the thermoelectric performance as well.
 
fortunately, blackburn, a senior scientist and manager of nrel's spectroscopy and photoscience group, has developed an 15 at separating semiconducting nanotubes from metallic ones and his methods were critical to the research, ferguson said.


点击收听单词发音收听单词发音  

1 b40b43fd5af2db4fbfeb4e83856e4876     
adj.调谐的,已调谐的v.调音( tune的过去式和过去分词 );调整;(给收音机、电视等)调谐;使协调
参考例句:
  • the resort is tuned in to the tastes of young and old alike. 这个度假胜地适合各种口味,老少皆宜。
  • the instruments should be tuned up before each performance. 每次演出开始前都应将乐器调好音。 来自《简明英汉词典》
2 kg4xs     
n.发电机,发生器
参考例句:
  • all the while the giant generator poured out its power.巨大的发电机一刻不停地发出电力。
  • this is an alternating current generator.这是一台交流发电机。
3 e8f0c85d58b4bbb32ca8f22222a8ee54     
n.投资组合( portfolio的名词复数 );(保险)业务量;(公司或机构提供的)系列产品;纸夹
参考例句:
  • price risk arises in non-trading portfolios, as well as in trading portfolios. 价格风险中出现的非贸易投资,以及在贸易投资组合。 来自互联网
  • how do we fatten our portfolios and stay financially healthy? 我们怎样育肥我们的投资结构和维持财政健康呢? 来自互联网
4 bw7yd     
n.合作,协作;勾结
参考例句:
  • the two companies are working in close collaboration each other.这两家公司密切合作。
  • he was shot for collaboration with the enemy.他因通敌而被枪毙了。
5 6p3yh     
adj.天蓝色的,蔚蓝色的
参考例句:
  • his eyes are azure.他的眼睛是天蓝色的。
  • the sun shone out of a clear azure sky.清朗蔚蓝的天空中阳光明媚。
6 mcyxz     
adj.大城市的,大都会的
参考例句:
  • metropolitan buildings become taller than ever.大城市的建筑变得比以前更高。
  • metropolitan residents are used to fast rhythm.大都市的居民习惯于快节奏。
7 zd6xf     
n.磨坊主
参考例句:
  • every miller draws water to his own mill.磨坊主都往自己磨里注水。
  • the skilful miller killed millions of lions with his ski.技术娴熟的磨坊主用雪橇杀死了上百万头狮子。
8 p6sxn     
adj.无生物的;无机的
参考例句:
  • the fundamentals of inorganic chemistry are very important.无机化学的基础很重要。
  • this chemical plant recently bought a large quantity of inorganic salt.这家化工厂又买进了大量的无机盐。
9 0e1983fea761e849266037e7a40cb125     
n.半导体( semiconductor的名词复数 )
参考例句:
  • crystals may be insulators, semiconductors, or conductors. 晶体可以是绝缘体,半导体,或导体。 来自辞典例句
  • semiconductors containing such impurities are called p-type semiconductors. 含有这类杂质的半导体叫做p型半导体。 来自辞典例句
10 uzuwq     
n.半导体
参考例句:
  • in the beginning,engineers hoped to use semiconductor lasers.在开始时,工程师们希望能够利用半导体激光器。
  • the main agent of the company brand semiconductor sales.本公司主要代理各品牌半导体销售。
11 vjpxb     
n.柔韧性,弹性,(光的)折射性,灵活性
参考例句:
  • her great strength lies in her flexibility.她的优势在于她灵活变通。
  • the flexibility of a man's muscles will lessen as he becomes old.人老了肌肉的柔韧性将降低。
12 5ppzpr     
n.打火机,点火器;驳船;v.用驳船运送;light的比较级
参考例句:
  • the portrait was touched up so as to make it lighter.这张画经过润色,色调明朗了一些。
  • the lighter works off the car battery.引燃器利用汽车蓄电池打火。
13 lcuxo     
adj.金属的;金属制的;含金属的;产金属的;像金属的
参考例句:
  • a sharp metallic note coming from the outside frightened me.外面传来尖锐铿锵的声音吓了我一跳。
  • he picked up a metallic ring last night.昨夜他捡了一个金属戒指。
14 4ibz1o     
adv.同时发生地,同时进行地
参考例句:
  • the radar beam can track a number of targets almost simultaneously.雷达波几乎可以同时追着多个目标。
  • the windows allow a computer user to execute multiple programs simultaneously.windows允许计算机用户同时运行多个程序。
15 fmtx0     
n.专门知识(或技能等),专长
参考例句:
  • we were amazed at his expertise on the ski slopes.他斜坡滑雪的技能使我们赞叹不已。
  • you really have the technical expertise in a new breakthrough.让你真正在专业技术上有一个全新的突破。
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