新粘合装置使人类墙上行走成为可能
文章来源:未知 文章作者:meng 发布时间:2010-02-03 00:08 字体: [ ]  进入论坛
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Could humans one day walk on walls, like Spider-Man? A palm-sized device invented at Cornell that uses water surface tension as an adhesive1 bond粘着力 just might make it possible. The rapid adhesion支持,粘附 mechanism2 could lead to such applications as shoes or gloves that stick and unstick to walls, or Post-it-like notes that can bear loads, according to Paul Steen, professor of chemical and biomolecular生物分子的 engineering, who invented the device with Michael Vogel, a former postdoctoral associate.

The device is the result of inspiration drawn3 from a beetle4甲虫 native to产自于…… Florida, which can adhere to a leaf with a force 100 times its own weight, yet also instantly unstick itself. Research behind the device is published online Feb. 1 in Proceedings5 of the National Academy of Sciences.

The device consists of a flat plate patterned with以……图案装饰 holes, each on the order of microns微米 (one-millionth of a meter). A bottom plate holds a liquid reservoir储液器, and in the middle is another porous6 layer多孔岩层,多孔质层. An electric field applied7 by a common 9-volt battery pumps water through the device and causes droplets8飞沫,液滴 to squeeze through the top layer. The surface tension of the exposed droplets makes the device grip another surface – much the way two wet glass slides stick together.

"In our everyday experience, these forces are relatively9 weak," Steen said. "But if you make a lot of them and can control them, like the beetle does, you can get strong adhesion forces."

For example, one of the researchers' prototypes was made with about 1,000 300-micron-sized holes, and it can hold about 30 grams – more than 70 paper clips. They found that as they scaled down按比例缩小的 the holes and packed more of them onto the device, the adhesion got stronger. They estimate, then, that a one-square-inch device with millions of 1-micron-sized holes could hold more than 15 pounds.

To turn the adhesion off, the electric field is simply reversed, and the water is pulled back through the pores气孔,毛穴, breaking the tiny "bridges" created between the device and the other surface by the individual droplets.

The research builds on previously10 published work that demonstrated the efficacy of what's called electro-osmotic pumping between surface tension-held interfaces11, first by using just two larger water droplets.

One of the biggest challenges in making these devices work, Steen said, was keeping the droplets from coalescing合并,联合, as water droplets tend to do when they get close together. To solve this, they designed their pump to resist water flow while it's turned off.

Steen envisions预想,想象 future prototypes原型,雏形 on a grander scale, once the pump mechanism is perfected, and the adhesive bond can be made even stronger. He also imagines covering the droplets with thin membranes13 – thin enough to be controlled by the pump but thick enough to eliminate wetting. The encapsulated密封的 liquid could exert运用,发挥 simultaneous forces, like tiny punches冲压机,凿子.

"You can think about making a credit card-sized device that you can put in a rock fissure裂缝 or a door, and break it open with very little voltage," Steen said. "It's a fun thing to think about."



点击收听单词发音收听单词发音  

1 adhesive CyVzV     
n.粘合剂;adj.可粘着的,粘性的
参考例句:
  • You'll need a strong adhesive to mend that chair. 你需要一种粘性很强的东西来修理那把椅子。
  • Would you give me an adhesive stamp?请给我一枚带胶邮票好吗?
2 mechanism zCWxr     
n.机械装置;机构,结构
参考例句:
  • The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
  • The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
3 drawn MuXzIi     
v.拖,拉,拔出;adj.憔悴的,紧张的
参考例句:
  • All the characters in the story are drawn from life.故事中的所有人物都取材于生活。
  • Her gaze was drawn irresistibly to the scene outside.她的目光禁不住被外面的风景所吸引。
4 beetle QudzV     
n.甲虫,近视眼的人
参考例句:
  • A firefly is a type of beetle.萤火虫是一种甲虫。
  • He saw a shiny green beetle on a leaf.我看见树叶上有一只闪闪发光的绿色甲虫。
5 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
6 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。
7 applied Tz2zXA     
adj.应用的;v.应用,适用
参考例句:
  • She plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
8 droplets 3c55b5988da2d40be7a87f6b810732d2     
n.小滴( droplet的名词复数 )
参考例句:
  • Droplets of sweat were welling up on his forehead. 他额头上冒出了滴滴汗珠。 来自辞典例句
  • In constrast, exhaled smoke contains relatively large water droplets and appears white. 相反,从人嘴里呼出的烟则包含相当大的水滴,所以呈白色。 来自辞典例句
9 relatively bkqzS3     
adv.比较...地,相对地
参考例句:
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
10 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
11 interfaces ad63a35ea2ac8a42233e5ac6cb325d34     
界面( interface的名词复数 ); 接口(连接两装置的电路,可使数据从一种代码转换成另一种代码); 交界; 联系
参考例句:
  • If the class needs to be reprogrammed, new interfaces are created. 如果class需要重新程序设计,新的interfaces创建。
  • Interfaces solve this problem of evolving code. Interfaces解决了代码升级的问题。
12 coalescing b795440b9ade4378fef3486b241378bc     
v.联合,合并( coalesce的现在分词 )
参考例句:
  • A mental model begins coalescing in their minds. 一个意识模型开始结合到他们的脑子里。 来自互联网
  • On the basis of coalescing this kind of element can separate oil from compressed air. 采用凝聚原理,分离压缩空气中的油份。 来自互联网
13 membranes 93ec26b8b1eb155ef0aeaa845da95972     
n.(动物或植物体内的)薄膜( membrane的名词复数 );隔膜;(可起防水、防风等作用的)膜状物
参考例句:
  • The waste material is placed in cells with permeable membranes. 废液置于有渗透膜的槽中。 来自辞典例句
  • The sarcoplasmic reticulum is a system of intracellular membranes. 肌浆网属于细胞内膜系统。 来自辞典例句
14 fissure Njbxt     
n.裂缝;裂伤
参考例句:
  • Though we all got out to examine the fissure,he remained in the car.我们纷纷下车察看那个大裂缝,他却呆在车上。
  • Ground fissure is the main geological disaster in Xi'an city construction.地裂缝是西安市主要的工程地质灾害问题。
TAG标签: walls adhere microns
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