Featured Research

from universities, journals, and other organizations

UNC Scientists' Research Promises Improved X-Ray Machines Using Carbon Nanotubes

Date:
July 2, 2002
Source:
University Of North Carolina At Chapel Hill
Summary:
The basic technology that produces X-rays has remained essentially the same for a century, but now scientists and physicians at the University of North Carolina at Chapel Hill and Applied Nanotechnologies Inc. say they should be able to improve it significantly.

CHAPEL HILL – The basic technology that produces X-rays has remained essentially the same for a century, but now scientists and physicians at the University of North Carolina at Chapel Hill and Applied Nanotechnologies Inc. say they should be able to improve it significantly.

Experiments the team conducted have shown they can cause carbon nanotubes, a new form of carbon discovered about a decade ago, to generate intense electron beams that bombard a metal "target" to produce X-rays. Researchers say they have demonstrated that their cold-cathode device can generate sufficient X-ray flux to create images of extremities such as the human hand.

The advantage of using carbon nanotubes is that machines incorporating them can work at room temperature rather than the 1500 or so degrees Celsius that conventional X-ray machines now require and produce.

"If this works as well as we think it will, we can make such machines a lot smaller and cooler and be able to turn them on and off much faster," said Dr. Otto Z. Zhou, associate professor of physics and materials sciences. "Other advantages are that they should be cheaper, be safer in terms of the lower heat generated, last longer, use less electricity and produce higher resolution images.

"We believe we have made a major breakthrough in X-ray technology, and we are extremely excited about it."

A report on their experiments appears in the July 8 issue of Applied Physics Letters, a science and technology journal. Patents on the UNC work are pending.

Besides Zhou, authors are Dr. Guo Z. Yue, a former UNC faculty member now with United Solar Systems; Qi Oiu and Drs. Bo Gao and Hideo Shimoda of Applied Nanotechnologies Inc., students Yuan Cheng and Jian Zhang, and Dr. Jian Ping Lu, associate professor of physics and astronomy and applied and materials sciences. Dr. Sha Chang, associate professor of radiation oncology at the UNC School of Medicine, also participated in the project.

"Scientists and others, including the popular press, have shown a lot of interest in carbon nanotubes because of numerous potential applications," Zhou said. "They are very strong tubular structures formed from a single layer of carbon atoms and are only about a billionth of a meter in diameter."

In the past, UNC scientists and others have used carbon nanotubes to produce electrons, he said. What's new is that until now, no one could generate enough electrons to create distinct images like conventional X-rays do. Nanotubes replace traditional metal filaments that must be heated to high temperatures before being subjected to an electric field. The tubes shed electrons easily because, being so small, they are extremely sharp.

"We already have taken pictures of human hands and fish that are as good as standard X-rays," Zhou said. "We think our images eventually will be clearer than conventional ones since we have a more pointed, tunable source of electrons. That would help doctors, for example, get more useful information from pictures of broken bones, for example."

The physicists are working with manufacturers to turn their discovery into working machines and expect to have them on the market within a year or two, he said.

Being able to miniaturize X-ray devices could have more major benefits, Zhou said, including allowing technicians to take X-rays inside or outside ambulances before ever leaving the scenes of accidents. No major technical obstacles remain in their way.

In addition, the new X-ray technology will allow manufacturing of large-scale X-ray scanning machines for industrial inspections, airport security screening and customs inspections.

Other uses of carbon nanotubes include flat panel display and telecommunications devices, fuel cells, high-strength composite materials and novel molecular electronics for the next generation of computers, he said. People have raised the possibility of using them to improve batteries, but no one demonstrated that they might work better than conventional materials until Zhou and his UNC team published a paper on the subject in January in Physical Review Letters.

That paper showed they could potentially improve electric batteries by using single-wall carbon nanotubes to help store electrical charges. They have patented the process of creating such nanotubes.

Zhou directs the N.C. Center for Nanoscale Materials at UNC. Applied Nanotechnologies Inc., which seeks to develop new industrial and medical applications for carbon nanotubes, is a new spin-off company resulting from his group's work. Support for the experiments came from the Office of Naval Research and private sources.


Story Source:

The above story is based on materials provided by University Of North Carolina At Chapel Hill. Note: Materials may be edited for content and length.


Cite This Page:

University Of North Carolina At Chapel Hill. "UNC Scientists' Research Promises Improved X-Ray Machines Using Carbon Nanotubes." ScienceDaily. ScienceDaily, 2 July 2002. <www.sciencedaily.com/releases/2002/07/020702065946.htm>.
University Of North Carolina At Chapel Hill. (2002, July 2). UNC Scientists' Research Promises Improved X-Ray Machines Using Carbon Nanotubes. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2002/07/020702065946.htm
University Of North Carolina At Chapel Hill. "UNC Scientists' Research Promises Improved X-Ray Machines Using Carbon Nanotubes." ScienceDaily. www.sciencedaily.com/releases/2002/07/020702065946.htm (accessed July 23, 2014).

Share This




More Matter & Energy News

Wednesday, July 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Government Approves East Coast Oil Exploration

Government Approves East Coast Oil Exploration

AP (July 18, 2014) The Obama administration approved the use of sonic cannons to discover deposits under the ocean floor by shooting sound waves 100 times louder than a jet engine through waters shared by endangered whales and turtles. (July 18) Video provided by AP
Powered by NewsLook.com
Sunken German U-Boat Clearly Visible For First Time

Sunken German U-Boat Clearly Visible For First Time

Newsy (July 18, 2014) The wreckage of the German submarine U-166 has become clearly visible for the first time since it was discovered in 2001. Video provided by Newsy
Powered by NewsLook.com
Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Reuters - US Online Video (July 17, 2014) President Barak Obama stopped by at a lunch counter in Delaware before making remarks about boosting the nation's infrastructure. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

TheStreet (July 16, 2014) Oil Futures are bouncing back after tumbling below $100 a barrel for the first time since May yesterday. Jeff Grossman is the president of BRG Brokerage and trades at the NYMEX. Grossman tells TheStreet the Middle East is always a concern for oil traders. Oil prices were pushed down in recent weeks on Libya increasing its production. Supply disruptions in Iraq fading also contributed to prices falling. News from China's economic front showing a growth for the second quarter also calmed fears on its slowdown. Jeff Grossman talks to TheStreet's Susannah Lee on this and more on the Energy Department's Energy Information Administration (EIA) report. Video provided by TheStreet
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins