Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Chemists announce nanotech breakthrough

Abstract:
Imagine you are looking through a very high-powered microscope at the smallest tube in the world - a single-walled carbon nanotube so tiny that a million can fit on the head of a pin.

Chemists announce nanotech breakthrough

Storrs, CT | Posted on April 1st, 2009

Imagine too that the exterior of the tube is covered in small irregular bumps caused by oxygen molecules that cling to the outside like barnacles on a pier. Now imagine trying to slide something - a slightly larger tube perhaps - over the bumpy tube to smooth out the surface.

In this molecular, microscopic world, it isn't easy; a near impossibility, in fact, that has proven a barrier to scientists for years.

But now, chemistry professor Fotios Papadimitrakopoulos and a team of researchers in the Nanomaterials Optoelectronics Laboratory at the Institute of Materials Science have found a way to smooth the surface of nanotubes, in what Papadimitrakopoulos describes as a major nanotechnology breakthrough that could have significant applications in medical imaging and other areas.

By developing a process in which a chemical ‘sleeve' tightly wraps itself around the nanotube, Papadimitrakopoulos managed to not only create a smooth new surface on the nanotube but also to ‘clean' its underlying exterior of defects in a way that has never been accomplished before.

Carbon nanotubes have traditionally been very poor emitters of light because of their bumpy exterior defects and have therefore been limited in some of their technological and medical applications.

As a result of the newly discovered wrapping process, Papadimitrakopoulos managed to increase the luminescence efficiency - the light emitting capability - of the nanotube 40-fold.

That increased luminescence, he says, opens the way for broad new advancements in science.

"The nanotube is the smallest tube on earth and we have found a sleeve to put over it," says Papadimitrakopoulos, whose discovery is featured in the March 6 issue of Science magazine. (www.sciencemag.org/cgi/content/short/323/5919/1319)

"This is the first time that a nanotube was found to emit with as much as 20 percent luminescence efficiency."

The more luminescent the nanotube, the brighter it appears under infrared irradiation or by electrical excitation (such as that provided by a light-emitting diode or LED).

Carbon nanotube emissions are not only extremely sharp, but they also appear in a spectral region where minimal absorption or scattering by soft tissue takes place, making them ideal for medical imaging, Papadimitrakopoulos says.

Increasing the luminescence efficiency of carbon nanotubes may someday make it possible for doctors to inject patients with microscopic nanotubes to detect tumors, arterial blockages, and other internal problems.

Rather than relying on potentially harmful X-rays or the use of radioactive dyes, physicians could simply scan patients with an infrared light that would capture the luminescence of the nanotubes in problem areas in very sharp resolution.

Carbon nanotubes also have properties that make them ideally suited for near-infrared emitters, Papadimitrakopoulos says, making them appropriate for applications in homeland security as bio-reporting agents in the case of terrorist attacks and as nano-sized beacons.

Their luminescence also allows them to readily integrate with silicon-based technology. This provides an enormous repertoire for nanotube use in advanced fiber optics components, infrared light modulators, and biological sensors.

The key to the discovery was a flavin-based (Vitamin B2) helical wrapping that formed an especially tight and seamless barrier around the nanotube.

Working closely with Papadimitrakopoulos in discovering the wrapping process were Sang-Yong Ju, a graduate student in the Polymer Program (now a researcher at Cornell University), and William Kopcha, a former undergraduate in chemistry in the College of Liberal Arts and Sciences who is now a first-year graduate student here.

The Center for Science and Technology Commercialization (CSTC) is assisting Papadimitrakopoulos in obtaining a patent for the process.

In addition, Xiao-Ming Xu, a graduate student in the Department of Pharmaceutics under the supervision of Professor Diane Burgess, created a computerized animation of the wrapping process that has allowed Papadimitrakopoulos to receive international media attention for the discovery.

The animation can be found at: www.ims.uconn.edu/~papadim/research.htm

This is the second major nanotube discovery at UConn by Papadimitrakopoulos in the past two years. Last year, Papadimitrakopoulos, Sang-Yong Ju, and other UConn researchers patented a way to isolate certain carbon nanotubes from others by using a similar method of wrapping a form of vitamin B2 around the nanotubes.

It was out of that research that Papadimitrakopoulos and Sang-Yong Ju began wrapping nanotubes with helical assemblies and probing their luminescence properties.

####

For more information, please click here

Copyright © University of Connecticut

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Meet the high-performance single-molecule diode: Major milestone in molecular electronics scored by Berkeley Lab and Columbia University team July 29th, 2015

Detecting small metallic contaminants in food via magnetization: A practical metallic-contaminant detecting system using three high-Tc RF superconducting quantum interference devices (SQUIDs) July 29th, 2015

Controlling phase changes in solids: Controlling phase changes in solids July 29th, 2015

New computer model could explain how simple molecules took first step toward life: Two Brookhaven researchers developed theoretical model to explain the origins of self-replicating molecules July 28th, 2015

Imaging

Short wavelength plasmons observed in nanotubes: Berkeley Lab researchers create Ludinger liquid plasmons in metallic SWNTs July 28th, 2015

Reshaping the solar spectrum to turn light to electricity: UC Riverside researchers find a way to use the infrared region of the sun's spectrum to make solar cells more efficient July 27th, 2015

Superfast fluorescence sets new speed record: Plasmonic device has speed and efficiency to serve optical computers July 27th, 2015

Ultra-thin hollow nanocages could reduce platinum use in fuel cell electrodes July 24th, 2015

Possible Futures

Smaller, faster, cheaper: A new type of modulator for the future of data transmission July 27th, 2015

Researchers predict material with record-setting melting point July 27th, 2015

Global Corrosion Resistant Nano Coatings Market To 2015: Acute Market Reports July 27th, 2015

Global Zinc oxide nanopowders Industry 2015: Acute Market Reports July 25th, 2015

Nanotubes/Buckyballs/Fullerenes

Short wavelength plasmons observed in nanotubes: Berkeley Lab researchers create Ludinger liquid plasmons in metallic SWNTs July 28th, 2015

'Seeing' molecular interactions could give boost to organic electronics July 28th, 2015

UT Dallas nanotechnology research leads to super-elastic conducting fibers July 24th, 2015

Nano-C Receives EPA Approvals for Single Walled Carbon Nanotubes July 21st, 2015

Nanomedicine

Stretching the limits on conducting wires July 25th, 2015

UT Dallas nanotechnology research leads to super-elastic conducting fibers July 24th, 2015

Nanopaper as an optical sensing platform July 23rd, 2015

Albany College of Pharmacy and Health Sciences to Host One Week Symposium on Nanomedicine July 23rd, 2015

Sensors

American Chemical Society expands reach to include rapidly emerging area of sensor science July 25th, 2015

UT Dallas nanotechnology research leads to super-elastic conducting fibers July 24th, 2015

Iranian Scientists Create Best Conditions for Synthesis of Gold Nanolayers July 23rd, 2015

Nanopaper as an optical sensing platform July 23rd, 2015

Discoveries

Meet the high-performance single-molecule diode: Major milestone in molecular electronics scored by Berkeley Lab and Columbia University team July 29th, 2015

Detecting small metallic contaminants in food via magnetization: A practical metallic-contaminant detecting system using three high-Tc RF superconducting quantum interference devices (SQUIDs) July 29th, 2015

Controlling phase changes in solids: Controlling phase changes in solids July 29th, 2015

Laboratorial Performance of Nanocomposite Membrane Improved in Water Purification July 28th, 2015

Announcements

Meet the high-performance single-molecule diode: Major milestone in molecular electronics scored by Berkeley Lab and Columbia University team July 29th, 2015

Detecting small metallic contaminants in food via magnetization: A practical metallic-contaminant detecting system using three high-Tc RF superconducting quantum interference devices (SQUIDs) July 29th, 2015

Controlling phase changes in solids: Controlling phase changes in solids July 29th, 2015

'Seeing' molecular interactions could give boost to organic electronics July 28th, 2015

Homeland Security

Nanopaper as an optical sensing platform July 23rd, 2015

Iranian Scientists Design Nano Device to Detect Cyanogen Toxic Gas June 23rd, 2015

New sensing tech could help detect diseases, fraudulent art, chemical weapons June 1st, 2015

UCLA nanoscientists are first to model atomic structures of three bacterial nanomachines: Cryo electron microscope enables scientists to explore the frontiers of targeted antibiotics April 21st, 2015

Military

Smart hydrogel coating creates 'stick-slip' control of capillary action July 27th, 2015

Researchers predict material with record-setting melting point July 27th, 2015

Reshaping the solar spectrum to turn light to electricity: UC Riverside researchers find a way to use the infrared region of the sun's spectrum to make solar cells more efficient July 27th, 2015

Superfast fluorescence sets new speed record: Plasmonic device has speed and efficiency to serve optical computers July 27th, 2015

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project