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Asunto:[dxcolombia] FW: [TowerTalk] Injecting liquid metal into a polymer results in a twistable, stretchable antenna.
Fecha:Martes, 8 de Diciembre, 2009  06:52:17 (-0500)
Autor:David J. Sourdis - HK1A <hk1kxa>

Metal líquido inyectado en un polímero resulta en una antena flexible...


> Monday, December 07, 2009
> This Antenna Bends but Won't Break
> Injecting liquid metal into a polymer results in a twistable,
> stretchable antenna.
> By Erika Jonietz
> Engineers at North Carolina State University have created a highly
> efficient, flexible, and self-healing antenna using a metal alloy that's
> a liquid at room temperature.
> Most of the materials that go into electronic devices are brittle,
> inflexible, and prone to damage, including the copper used most
> frequently to make antennas. The new liquid-metal antenna could make it
> easier to send and receive data from flexible electronics. Possible uses
> include sensors incorporated into clothing or other textiles, pliant
> electronic paper, or implantable biomedical devices.
> Michael Dickey, an assistant professor of chemical and biomolecular
> engineering at NC State, was working with a gallium-indium alloy, which
> is liquid at room temperature, researching how it behaves in
> microchannels with a view to electronics fabrication applications.
> Hunting for other possible uses, he hit on the idea of making a flexible
> antenna. In collaboration with electrical engineer Gianluca Lazzi--then
> at NC State, now chair of the department of electrical and computer
> engineering at the University of Utah--Dickey and his students used the
> alloy and a common flexible polymer called polydimethylsiloxane (PDMS)
> to make a simple dipole antenna--essentially a straight rod, like the
> old-fashioned "bunny ear" antennas used for analog TV.
> The researchers poured liquid PDMS into a mold that left it with a
> single internal channel once cured. They then injected the liquid
> gallium-indium mixture into the channel and sealed it. "It's all pretty
> straightforward," Dickey says.
> Researchers at Lazzi's lab tested the antenna's performance and found
> that they could create an electrical contact with the device simply by
> jabbing a wire into the liquid, eliminating the need for solder. In the
> lab, the antenna radiated over a broad frequency range at about 90
> percent efficiency--equivalent to the efficiency of a similar antenna
> made of copper. "That's the first thing we were surprised by," says
> Lazzi. The antenna also remained functional while the engineers bent,
> twisted, and folded it in half; they even stretched it an additional 40
> percent beyond its normal length. When the stress was released, the PDMS
> snapped back to its original shape.
> <>
> 73,
> Steve
> NN4X
> EL98jh
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