银纳米粒子可在紧急情况下用于生产饮用水
文章来源:未知 文章作者:enread 发布时间:2011-02-24 03:21 字体: [ ]  进入论坛
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Disasters such as floods, tsunamis1, and earthquakes often result in the spread of diseases like gastroenteritis(肠胃炎) , giardiasis(贾第虫病) and even cholera2(霍乱) because of an immediate3 shortage of clean drinking water. Now, chemistry researchers at McGill University have taken a key step towards making a cheap, portable, paper-based filter coated with silver nanoparticles to be used in these emergency settings. "Silver has been used to clean water for a very long time. The Greeks and Romans kept their water in silver jugs," says Prof. Derek Gray, from McGill's Department of Chemistry. But though silver is used to get rid of bacteria in a variety of settings, from bandages to antibacterial socks, no one has used it systematically4 to clean water before. "It's because it seems too simple," affirms Gray.

Prof. Gray's team, which included graduate student Theresa Dankovich, coated thick (0.5mm) hand-sized sheets of an absorbent(能吸收的) porous5(渗透的) paper with silver nanoparticles and then poured live bacteria through it. "Viewed in an electron microscope, the paper looks as though there are silver polka dots all over," says Dankovich, "and the neat thing is that the silver nanoparticles stay on the paper even when the contaminated water goes through." The results were definitive6. Even when the paper contains a small quantity of silver (5.9 mg of silver per dry gram of paper), the filter is able to kill nearly all the bacteria and produce water that meets the standards set by the American Environmental Protection Agency (EPA).

The filter is not envisaged7(设想) as a routine water purification system, but as a way of providing rapid small-scale assistance in emergency settings. "It works well in the lab," says Gray, "now we need to improve it and test it in the field."

The research was funded by the National Sciences and Engineering Council of Canada (NSERC) and the work is part of the NSERC Sentinel Bioactive Paper Network.



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1 tsunamis a759fe8c9bbe15580d54b753ecec1e73     
n.海啸( tsunami的名词复数 )
参考例句:
  • Our oceans are alive with earthquakes, volcanoes, and more recently, tsunamis. 海中充满着地震、火山,包括最近发生的海啸。 来自常春藤生活英语杂志-2006年2月号
  • Please tell me something more about tsunamis! 请您给我讲讲海啸吧! 来自辞典例句
2 cholera rbXyf     
n.霍乱
参考例句:
  • The cholera outbreak has been contained.霍乱的发生已被控制住了。
  • Cholera spread like wildfire through the camps.霍乱在营地里迅速传播。
3 immediate aapxh     
adj.立即的;直接的,最接近的;紧靠的
参考例句:
  • His immediate neighbours felt it their duty to call.他的近邻认为他们有责任去拜访。
  • We declared ourselves for the immediate convocation of the meeting.我们主张立即召开这个会议。
4 systematically 7qhwn     
adv.有系统地
参考例句:
  • This government has systematically run down public services since it took office.这一屆政府自上台以来系统地削减了公共服务。
  • The rainforest is being systematically destroyed.雨林正被系统地毀灭。
5 porous 91szq     
adj.可渗透的,多孔的
参考例句:
  • He added sand to the soil to make it more porous.他往土里掺沙子以提高渗水性能。
  • The shell has to be slightly porous to enable oxygen to pass in.外壳不得不有些细小的孔以便能使氧气通过。
6 definitive YxSxF     
adj.确切的,权威性的;最后的,决定性的
参考例句:
  • This book is the definitive guide to world cuisine.这本书是世界美食的权威指南。
  • No one has come up with a definitive answer as to why this should be so.至于为什么该这样,还没有人给出明确的答复。
7 envisaged 40d5ad82152f6e596b8f8c766f0778db     
想像,设想( envisage的过去式和过去分词 )
参考例句:
  • He envisaged an old age of loneliness and poverty. 他面对着一个孤独而贫困的晚年。
  • Henry Ford envisaged an important future for the motor car. 亨利·福特为汽车设想了一个远大前程。
TAG标签: water diseases meergency
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