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    jueves, febrero 15, 2007

    Storage devices will be made of water

    Storage devices will be made of water
    http://www.theinquirer.net/default.aspx?article=31326
    Fish and chips

    By Nick Farrell: viernes 28 abril 2006, 07:19


    BOFFINS at the University of Pennsylvania, Drexel University and Harvard University have come up with an idea for a storage device which involves some nano-structures and a bit of water. Normally if you tip water over your computer, you msy get an electric shock and your computer will keel over and die, but the boffins have worked out that you can get stable ferroelectricity in nanostructures by terminating their surfaces with traces of water.

    Jonathan Spanier, assistant professor of materials science and engineering at Drexel has successfully demonstrated the benefits of using water to stabilise memory bits in segments of oxide nanowires that are only about three billionths of a meter wide.

    He said that he was particularly excited that water managed to make these wires 'remember' data. It means that if the technique was applied to store data, it would be possible to have more than 100,000 terabits per cubic centimetre.

    According to the writers at uPenn.edu, this would mean an iPod sized device could store enough MP3 music to play for 300,000 years without repeating a song or enough DVD quality video to play movies for 10,000 years without repetition.

    It would also mean that the RIAA would be suing anyone who runs a tap for owning a storage devise capable of holding pirated music and dragging goldfish, even dead goldfish, into court.


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    Water and Nanoelectronics Will Mix to Create Ultra-Dense Memory Storage Devices, Researchers Say
    April 26, 2006
    From the Penn Office of University Communications
    http://www.upenn.edu/pennnews/article.php?id=956

    PHILADELPHIA -- Excessive moisture can typically wreak havoc on electronic devices, but now researchers have demonstrated that a little water can help create ultra-dense storage systems for computers and electronics.

    A team of experimentalists and theorists at the University of Pennsylvania, Drexel University and Harvard University has proposed a new and surprisingly effective means of stabilizing and controlling ferroelectricity in nanostructures: terminating their surfaces with fragments of water. Ferroelectrics are technologically important "smart" materials for many applications because they have local dipoles, which can switch up and down to encode and store information. The team's work is reported in the April issue of Nano Letters.

    "It is astonishing to see that a single wire of even a few atoms across can act as a stable and switchable dipole memory element," Jonathan Spanier, assistant professor of materials science and engineering at Drexel, said.

    Spanier and his colleagues successfully demonstrated the benefits of using water to stabilize memory bits in segments of oxide nanowires that are only about 3 billionths of a meter wide.

    "We have been interested in how water sticks to oxides," Alexie Kolpak, Penn graduate student in theoretical physical chemistry, said. "We are particularly excited that water is the key ingredient in making these wires 'remember' their state."

    In this investigation, led by Hongkun Park of Harvard and Andrew Rappe of Penn, the researchers probed oxide nanowires individually to characterize the size-dependence of ferroelectricity and performed calculations and experiments to validate the presence of molecules on oxide surfaces and detail their important role in nanoscale ferroelectricity. Significantly, these results show that ferroelectric surfaces with water fragments or other molecules can stabilize ferroelectricity in smaller structures than previously thought.

    Though a scheme for the dense arrangement and addressing of these nanowires remains to be developed, such an approach would enable a storage density of more than 100,000 terabits per cubic centimeter. If this memory density can be realized commercially, a device the size of an iPod nano could hold enough MP3 music to play for 300,000 years without repeating a song or enough DVD quality video to play movies for 10,000 years without repetition.

    This work is supported by the National Science Foundation, the Packard Foundation, the Dreyfus Foundation, the Office of Naval Research, the Center for Piezoelectric Design and the Army Research Office.

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