carbon

Carbon fibers make tiny, cheap video displays (press release)

Friday, October 13, 2006 by: NaturalNews
Tags: health news, Natural News, nutrition

eTrust Pro Certified

Most Viewed Articles
Popular on Facebook
Malaysia Airlines Flight 370 now clearly a government cover-up: All evidence contradicts official story
White House admits staging fake vaccination operation to gather DNA from the public
10 other companies that use the same Subway yoga mat chemical in their buns
High-dose vitamin C injections shown to annihilate cancer
Irrefutable proof we are all being sprayed with poison: 571 tons of toxic lead 'chemtrailed' into America's skies every year
EXCLUSIVE: Natural News tests flu vaccine for heavy metals, finds 25,000 times higher mercury level than EPA limit for water
Truvia sweetener a powerful pesticide; scientists shocked as fruit flies die in less than a week from eating GMO-derived erythritol
Senator who attacked Doctor Oz over dietary supplements received over $146,000 in campaign contributions from Big Pharma mega-retailer and Monsanto
Global warming data FAKED by government to fit climate change fictions
U.S. treating meat with ammonia, bleach and antibiotics to kill the '24-hour sickness'
HOAX confirmed: Michelle Obama 'GMOs for children' campaign a parody of modern agricultural politics
Ben and Jerry's switches to non-GMO, Fair Trade ice cream ingredients
Battle for humanity nearly lost: global food supply deliberately engineered to end life, not nourish it
Diet soda, aspartame linked to premature deaths in women
Cannabis kicks Lyme disease to the curb
Elliot Rodger, like nearly all young killers, was taking psychiatric drugs (Xanax)
Harvard research links fluoridated water to ADHD, mental disorders
Right to farm being stripped from Americans: Michigan to criminalize small family farms with chickens, goats, honey bees and more
Delicious
Engineers who develop microelectromechanical systems (MEMS) like to make their tiny machines out of silicon because it is cheap, plentiful and can be worked on with the tools already developed for making microelectronic circuits. There is just one problem: Silicon breaks too easily.

For decades, researchers have been trying to make video displays using tiny mirrors mounted on silicon oscillators. But silicon won't oscillate fast enough and bend far enough.

"You need something incredibly stiff to oscillate at a resonant frequency of 60,000 times a second (the line-scanning rate of most video displays), but it also needs to bend a lot for adequate image size," explained Shahyaan Desai, a Cornell graduate student who has been working for more than three years to create a practical MEMS video display device.

So Desai and his Cornell colleagues have turned to carbon fiber, the same material used to reinforce auto and aircraft body parts, bicycle frames and fishing rods.

"Carbon fiber is twice as stiff as silicon but 10 times more flexible," said Desai.

He is first author of a paper with Michael Thompson, Cornell associate professor of materials science and engineering, and Anil Netravali, Cornell professor of fiber science, on using carbon fibers in MEMS, published in the July issue of the Journal of Micromechanics and Microengineering.

Carbon fibers are made of thin, narrow sheets of graphite that roll up and clump together to form fibers. For industrial uses the fibers are embedded in plastic to form composite materials that are stronger than steel, yet lighter. Desai's MEMS are made with the raw fibers.

Desai first showed that micrometer-scale carbon fibers can bend like tiny fishing rods by more than 90 degrees and can be made to vibrate billions of times without breaking down. "This is, to our knowledge, the first material to even approach such large deformation at high frequencies without observable fatigue," the researchers wrote in their paper.

"Carbon is normally a brittle material," Desai said, "but in the fiber form it resists breakage. We have some data implying that if it lasts three and a half days it's going to last forever."

Desai then built an optical scanner consisting of a tiny rectangular mirror measuring 400 by 500 microns, supported by two carbon-fiber hinges about 55 microns across. Made to oscillate at 2.5 kHz, the tiny mirror caused a laser beam to scan across a range of up to 180 degrees, corresponding to a 90-degree bend by the carbon fibers.

An oscillating mirror could be used to scan a laser beam across a screen, and an array of mirrors, one for each horizontal line, could produce an image in the same way that a moving electron beam creates an image on a television screen.

"It would be an incredibly cheap display," Desai said. And the entire device would be small enough to build into a cell phone to project an image on a wall.

Besides serving as oscillators, the researchers said, carbon fibers could be made into clock springs that either unwind slowly to power a micromachine over a period of time or unwind rapidly to provide a sudden burst of power, or used as micro-sized pendulums that could harvest energy from motion like a mechanical self-winding watch to make cell phones, PDAs and even watches that are powered by the user's movement.

Contact: Press Relations Office pressoffice@cornell.edu 607-255-6074 Cornell University News Service

Join over four million monthly readers. Your privacy is protected. Unsubscribe at any time.
comments powered by Disqus
Take Action: Support NaturalNews.com by linking back to this article from your website

Permalink to this article:

Embed article link: (copy HTML code below):

Reprinting this article:
Non-commercial use OK, cite NaturalNews.com with clickable link.

Follow Natural News on Facebook, Twitter, Google Plus, and Pinterest

Advertise with NaturalNews...

Support NaturalNews Sponsors:

Advertise with NaturalNews...

GET SHOW DETAILS
+ a FREE GIFT

Sign up for the FREE Natural News Email Newsletter

Receive breaking news on GMOs, vaccines, fluoride, radiation protection, natural cures, food safety alerts and interviews with the world's top experts on natural health and more.

Join over 7 million monthly readers of NaturalNews.com, the internet's No. 1 natural health news site. (Source: Alexa.com)

Your email address *

Please enter the code you see above*

No Thanks

Already have it and love it!

Natural News supports and helps fund these organizations:

* Required. Once you click submit, we will send you an email asking you to confirm your free registration. Your privacy is assured and your information is kept confidential. You may unsubscribe at anytime.