Saturday, August 20, 2005

Woven nanotube technology

(Here's something that caught my eye in the local paper. Think of the possibilities! You could have a bicycle frame that changed properties as you climbed, descended, or sprinted. The ride quality could change depending on road conditions. And eventually, the UCI will have to come up with a test for nanotube enhanced muscles. Mary, the love of my life, has an adult form of muscular dystrophy, so the idea of increasing muscular strength through mechanical means could be very appealing, not only to athletes.....Ed)

News Release

News Contact: Steve McGregor, UTD, (972) 883-2293, smcgreg@utdallas.eduU. T.

Dallas-Led Research Team Produces
Strong, Transparent Carbon Nanotube Sheets
Numerous Electronic, Optical and Structural Uses Demonstrated;

Advance Reported in Aug. 19 Issue of Prestigious Journal Science

RICHARDSON, Texas (Aug. 18, 2005) – University of Texas at Dallas (UTD) nanotechnologists and an Australian colleague have produced transparent carbon nanotube sheets that are stronger than the same-weight steel sheets and have demonstrated applicability for organic light-emitting displays, low-noise electronic sensors, artificial muscles, conducting appliqués and broad-band polarized light sources that can be switched in one ten-thousandths of a second.

Carbon nanotubes are like minute bits of string, and untold trillions of these invisible strings must be assembled to make useful macroscopic articles that can exploit the phenomenal mechanical and electronic properties of the individual nanotubes. In the Aug. 19 issue of the prestigious journal Science, scientists from the NanoTech Institute at UTD and a collaborator, Dr. Ken Atkinson from Commonwealth Scientific and Industrial Research Organization (CSIRO), a national laboratory in Australia, report such assembly of nanotubes into sheets at commercially useable rates.

...The nanotube sheets combine high transparency with high electronic conductivity, are highly flexible and provide giant gravimetric surface areas, which has enabled the team to demonstrate their use as electrodes for bright organic light emitting diodes for displays and as solar cells for light harvesting. Electrodes that can be reversibly deformed over 100 percent without losing electrical conductivity are needed for high stroke artificial muscles, and the Science article describes a simple method that makes this possible for the nanotube sheets.

...The applications possibilities seem even much broader than the present demonstrations, Baughman said. For example, researchers from the Regenerative Neurobiology Division at Texas Scottish Rite Hospital for Children, Dr. Mario Romero, Director, and Dr. Pedro Galvan-Garcia, Senior Researcher Associate, and Dr. Larry Cauller, associate professor in UTD’s neuroscience program, have initial evidence suggesting that healthy cells grow on these sheets – so they might eventually be applied as scaffolds for tissue growth.

Baughman said that numerous other applications possibilities exist and are being explored at UTD, including structural composites that are strong and tough; supercapacitors, batteries, fuel cells and thermal-energy-harvesting cells exploiting giant-surface-area nanotube sheet electrodes; light sources, displays, and X-ray sources that use the nanotube sheets as high-intensity sources of field-emitted electrons; and heat pipes for electronic equipment that exploit the high thermal conductivity of nanotubes. Multifunctional applications like nanotube sheets that simultaneously store energy and provide structural reinforcement for a side panel of an electrically powered vehicle also are promising, he said.


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