University of Virginia engineering professor Mool C. Gupta and his team have used carbon nanotubes to unite the virtues of plastics and metals in a new ultra-lightweight , conductive material that may revolutionize electromagnetic shielding and more.
The team's innovation will be honored with a Nano50 award from Nanotech Briefs magazine, which recognizes the top 50 technologies, products and innovators that have significantly impacted nanotechnology.
Sensitive electronic devices like cell phones and computers require shielding from electromagnetic interference (EMI). Such shielding which must be electrically conductive has traditionally been made of metal, which poses a weight problem in the push to miniaturize and lighten electronics.
In response, Gupta led a team that has developed an ultra-lightweight nanocomposite that outperforms conventional shielding.
This new nanocomposite material is a mixture of plastic, carbon nanotubes and a foaming agent, making it extremely lightweight, corrosion-proof and cheaper to produce than metal.
The carbon nanotubes play a key role in creating these unique properties, explained Gupta. Most notably, experiments revealed that only 1 percent to 2 percent of the materials composition needed to be comprised of nanotubes to increase the electrical conductivity by 10 orders of magnitude.
The addition of carbon nanotubes also increased the materials thermal conductivity, improving its capacity to dissipate heat.
Metal is not only heavy; it corrodes easily, Gupta said. And plastic insulators are lightweight, stable and cheaper to produce, but cannot conduct electricity. So the goal, originally, was to take plastic and make it electrically conductive.
After experimenting with adding metal powder to plastics without impacting the weight of the material significantly, Gupta turned to carbon nanotubes. With their ultra-small diameter, higPage: 1 2 Related medicine news :1
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