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Shape matters in the case of cobalt nanoparticles
Date:6/17/2009

few minutes exposure to the illuminating beam of a transmission electron microscope, the nanocubes melt together, forming nanowires that are no longer separable as individual nanoparticles. The effect, not observed with the spheres, is surprising because the cubes average 50 nm across, much larger than the spheres 10 nm diameters. You might expect the smaller objects to have a lower melting point, Hight Walker says. However, the sharp edges and corners in the nanocubes could be the locations to initiate melting.

While Walker says that the melting effect could be a potential method for fabricating nanostructures, it also demands further attention. This newfound effect demonstrates the need to characterize the physico-chemical properties of nanoparticles extremely well in order to pursue their applications in biology and medicine, she says.


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Contact: Chad Boutin
boutin@nist.gov
301-975-4261
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

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