B1 中級 802 タグ追加 保存
This episode of DNews is brought to you by the U.S. Air Force.
Tiny robots of the future will need tiny batteries, tiny cameras and tiny motors, and scientists
of today are working on them RIGHT NOW.
Futurist Ray Kurzweil has been quoted saying that in 25 years, the computer in your phone
will be millions of times more powerful, but will be the size of a blood cell. New nano-engineering
is helping scientists build the robot which that computer could drive… At the moment,
when I think of crazy robots, I think of the DARPA Big Dog or BINA48. But because of this
new technique, future robots could be the size of specks of dust or smaller!
Engineers in China and Australia have created a double-walled carbon nanotube motor! They
published their findings in the journal Nanotechnology, and believe this could be a big player in
future nanodevices. We've talked about graphene before -- a super strong one-atom thick sheet
of carbon atoms. When you roll them into a tiny tube, you get a carbon nanotube. Carbon
nanotubes are exceptionally strong, but when you roll TWO that fit together, the engineers
believe, a nanomotor could result.
At the macro-level motors run when a magnetic device is spun inside a tube of electrical
wire. The current in the wire creates a magnetic flux which pulls the inner magnet around,
running the motor. But at the nano-level? No way is that gonna work, Jack. You can't
solder a wire onto the outer tube, and run electricity, so instead this double-walled
carbon nanotube motor works, because at the atomic level, there's a thing called a "van
der Waals interaction."
A van der Waals interaction describe how atoms interact with each other due to electrical
charge, which makes perfect sense when talking about nano-scale motor engineering. In this
case, when the researchers put the two tubes together to these atomic forces caused the
inner nanotube to spin! Then they had to figure out how to CONTROL that spin, because a spinning
tube isn't of much use on it's own.
The researchers messed with the length of the outer tube to change speed, and found
the ideal amount of space between the inner and outer tubes to encourage rotation, but
in the end temperature is the keystone. At a fairly warm room temperature -- 300 Kelvin
(27C/80F) -- the amount of kinetic energy or about f they regulate the temperature of
the room they can change the speed of the rotation! Obviously, their goal is to create
a temperature-driven motor made of double-walled carbon nanotubes -- so we'll have to see where
this goes.
Nano-scale engineering isn't new, but the idea of making a nanomotor is pretty novel.
Nano means 10 to the negative ninth power… Or, one one billionth of a meter. It's pretty
small. Working at that scale requires extreme precision and if engineers can master the
skills, then it's only a matter of time before Ray Kurzweil's blood cell computer is put
into a blood cell nanoelectromechanical system. We could augment our immune systems, rebuild
our bodies or even ingest new technologies! Who knows!! The future is going to be a crazy
place. And I’m happy scientists are keeping their eyes on it.
You know who else is always looking at the future? The brave men and women in the United
States Air Force! American Airmen are fueled by innovation, and every day they go above
and beyond to break barriers both professionally and personally. So, a big shout out to the
U.S. Air Force for supporting DNews.
What do you think of all this? Freaked out by a microscopic robot or excited?


How Scientists Are Building Tiny Microscopic Motors

802 タグ追加 保存
羅紹桀 2015 年 11 月 9 日 に公開
  1. 1. クリック一つで単語を検索


  2. 2. リピート機能


  3. 3. ショートカット


  4. 4. 字幕の表示/非表示


  5. 5. 動画をブログ等でシェア


  6. 6. 全画面再生


  1. クイズ付き動画


  1. クリックしてメモを表示

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔