New Molecule Heralds Breakthrough in Electronic Plastics

TECH SPACE

An organic solution of Oligotron mixed with chemicals that help the material set under ultraviolet light (top, in vial); a "mask," made by a laser printer on an overhead transparency, which was used to control the exposure of light (middle); and a photoprinted �NSF� image after exposure to ultraviolet light and rinsing (bottom). Credit: Photo by Brian J. Elliott, TDA Research, Inc.

Arlington VA - Apr 13, 2004
Researchers have developed a new plastic that conducts electricity, may be simpler to manufacture than industry counterparts and easily accommodates chemical attachments to create new materials.

Developed by TDA Research in Wheat Ridge, Colo., Oligotron polymers are made of tiny bits of material that possess a conducting center and two, non-conducting end pieces. The end pieces allow the plastic bits to dissolve in solvents and accommodate specialized molecules.

For decades, researchers have been trying to craft electronics that use plastics instead of metal to transmit currents. In addition to the potential savings in weight and cost, conducting polymers could be manufactured in a variety of convenient shapes, yielding such innovations as fabrics that transmit data and incredibly thin video displays.

However, because conducting polymers initially were not soluble in liquids, they could not be manufactured as easily as could their common counterparts used in soda bottles and synthetic fibers.

Recent discoveries resulted in a water-soluble conducting polymer called PEDOT (polyethylenedioxythiophene), yet water can corrode device parts during manufacturing and shorten the lifespan of the end product.

Oligotron, developed with National Science Foundation (NSF) Small Business Innovation Research (SBIR) support, contains a PEDOT center, but it is soluble in non-corrosive chemicals and can attach new compounds to its end pieces, adding a variety of functions.

For example, researchers have proposed end pieces that convert solar energy into electricity, ultimately creating a novel solar cell material.

Oligotron also has special properties that allow the material to be "printed" into various device shapes. When technicians shine a pattern of ultraviolet light, such as a complex circuit image, onto a film of dissolved Oligotron, the exposed areas of plastic become "fixed" like a photograph. Flexible and lightweight, the circuit is also fully functional.

TDA researchers predict applications for the product that range from flexible television displays and smart cards to antistatic treatments and conducting fabrics.

TECH SPACE

Time-Reversal Acoustics Research Promises Medical Breakthroughs

Hoboken NJ - Apr 08, 2004
Scientists have not yet found a way to actually make time run backward, but in the cutting-edge world of recent acoustics research, they have shown a way to make sound waves run backward in a kind of ultra-focused reverse echo. By the technology known as time-reversal acoustics, sound waves - in exact reverse order from the original sound - echo directly and very precisely back to their source point.

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