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Engineers: Weak laser can ignite nanoparticles, with exciting possibilities
Date:3/18/2010

cells, and then after 10 seconds we just see the cells pop," said Krishna, a postdoctoral associate in the Particle Engineering Research Center.

He said the finding suggests doctors could dose patients with the polyhdroxy fullerenes, identify the location of cancers, then treat them using low-power lasers, leaving other tissues unharmed. Another application would be to image the locations of tumors or other areas of interest in the body using the fullerenes' capability to light up.

The paper also reports the researchers used fullerenes to ignite a small explosive charge. The weak laser contained far less energy than standard electrical explosive initiators, the researchers said, yet still ignited a type of functionalized fullerenes called carboxy fullerenes. That event in turn ignited comparatively powerful explosives used in traditional blasting caps.

Mining, tunneling or demolition crews currently run electrical lines to explosives, a time-consuming and expensive process for distant explosives. The experiment suggests crews could use blasting caps armed with the fullerenes and simply point a laser to set them off.

"Traditional bursting caps require a lot of energy to ignite they use a hot tungsten filament," said Nathanael Stevens, a postdoctoral associate in the Particle Engineering Research Center. "So, it is interesting that we can do it with just a low-powered laser."

The researchers coated paper with polyhyroxy fullerenes, then used an ultrahigh resolution laser to write a miniature version of the letters "UF." The demonstration suggests the technique could be used for many applications that require extremely minute, precise, lithography. Moudgil said the researchers had developed one promising application involving creating the intricate patterns on computer chips.

Although not discussed in the paper, other potential applications include infusing the fullerenes in gasoline, then igniting them with lase
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Contact: Vijay Krishna
vkrishna@perc.ufl.edu
352-846-3322
University of Florida
Source:Eurekalert

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