A simple and versatile mini-arc plasma source for nanocrystal synthesis |
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Authors: | Junhong Chen Ganhua Lu Liying Zhu Richard C Flagan |
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Institution: | (1) Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA;(2) Department of Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA |
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Abstract: | Nanocrystals in the lower-nanometer-size range are attracting growing interest due to their unique properties. A simple and
versatile atmospheric direct current mini-arc plasma source has been developed to produce nanoparticles as small as a few
nanometers. The nanoparticles are formed by direct vaporization of solid precursors followed by a rapid quenching. Both semiconductor
tin oxide and metallic silver nanoparticles have been produced at rates of 1–10 mg/h using the mini-arc source. Transmission
electron microscopy and X-ray diffraction analyses indicate that most nanoparticles as produced are nonagglomerated and crystalline.
Size distributions of nanoparticles measured with an online scanning electrical mobility spectrometer are broader than the
self-preserving distribution, suggesting that the nanoparticle growth is coagulation-dominated, and that the particles experience
a range of residence times. The electrical charges carried by as-produced aerosol nanoparticles facilitate the manipulation
of nanoparticles. The new mini-arc plasma source hence shows promise to accelerate the exploration of nanostructured materials. |
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Keywords: | nanoparticles nanocrystals arc plasma synthesis nonagglomerated nanoengineering |
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