David Kirkpatrick

November 2, 2010

Cool nanotech image — growing nanowires

Cool image and interesting process

nanotechnology image
In the growth of sapphire nanowires using the vapor-liquid-solid method, scientists have observed that a facet at the liquid-solid interface alternately grows and shrinks, which promotes nanowire growth. These images are from the video below. Image credit: Sang Ho Oh, et al.

From the link:

Nanowires can be grown in many ways, but one of the lesser-understood growth processes is vapor-liquid-solid (VLS) growth. In VLS, a vapor adsorbs onto a liquid droplet, and the droplet transports the vapor and deposits it as a crystal at a liquid-solid interface. As the process repeats, a nanowire is built one crystal at a time. One advantage of the VLS process is that it allows scientists to control the nanowire’s growth in terms of size, shape, orientation, and composition, although this requires understanding the growth mechanisms on the atomic scale. In a new study, scientists have investigated the steps involved in VLS growth, and have observed a new oscillatory behavior that could lead to better controlled nanowire growth.

Hit the link for a video of the process.

September 18, 2009

Data storage breakthrough

Via KurzweilAI.net — A three-fer from today’s newsletter.

Super-dense data stores cool down

New Scientist Tech, Sept. 17, 2009

A material that could allow super-dense (125 gigabytes per square inch) “millipede”-style data storage systems to work at room temperature (and thus be a viable commercial product) has been developed by researchers at Pohang University of Science and Technology in Kyungbuk, Korea.

The system uses a “baroplastic” — a hard polymer that becomes soft when placed under pressure — and the tip of an atomic force microscope (AFM) to etch the kind of tiny pits that store data.

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