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Old 17th December 2008, 07:36 PM   #1
Evaas is offline Evaas  Canada
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Default article on new thermoacoustic material

There's an article on a new material in this month's Nature http://www.nature.com/nature/journal...l/456840e.html:

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Imagine a loudspeaker that is bendy, transparent and stretches to twice its length without breaking or changing the intensity of the sound it amplifies. This is what Kaili Jiang and Shoushan Fan of Tsinghua University in Beijing, China, and their colleagues have made. By attaching one of their prototype films to the screen of an iPod they have used it to play sound from the device. The invention exploits the thermoacoustic effect, which was first realized in the nineteenth century with the platinum thermophone. The effect describes what happens when a material is heated and cooled, thus expanding and contracting the air around it, which creates sound waves. The film on the researchers' iPod generates sound 260 times more efficiently than this historical gadget because the sheets of parallel carbon nanotubes that it is made of warm up and transfer heat to air faster.
I'm not sure how many decades it will be before we can get our hands on some, but maybe food for thought

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Old 17th December 2008, 07:46 PM   #2
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You are the 5th one to start a thread on this...

Carbon nanotube loudspeakers

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Old 17th December 2008, 07:51 PM   #3
Evaas is offline Evaas  Canada
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Default oop

sorry.. bad poster trying to rush it out
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Old 17th December 2008, 10:52 PM   #4
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Default Re: oop

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Originally posted by Evaas
.. bad poster
Not bad, just ethusiastic

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Old 18th December 2008, 04:27 AM   #5
Ziggy is offline Ziggy  Australia
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Eh!.............they'll be out next year..........I'm gonna stretch some of this material over my wok.
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