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1 Oct 2007

Volume 91, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 91, 143101 (2007); http://dx.doi.org/10.1063/1.2789812 (3 pages)

Hyun S. Kim, Hua Qin, and Robert H. Blick
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Effects of the medium on synthesis of nanopowders by wire explosion process

C. Cho, Y. W. Choi, C. Kang, and G. W. Lee

Appl. Phys. Lett. 91, 141501 (2007); http://dx.doi.org/10.1063/1.2794724 (3 pages) | Cited 17 times

Online Publication Date: 2 October 2007

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Silver nanopowder was produced in air and water media by wire explosion process. Size of the particles formed in water was smaller than that in air. In water medium, compared with air, the delay of plasma formation resulted in a higher energy deposition in the wire. As a consequence, there were no micrometer size particles in the powder, which is attributed to the complete vaporization of the wire. It is considered that the wire explosion in liquid medium meets three conditions to form smaller particles, namely, higher energy deposition in the wire, sufficient expansion volume, and quick cooling of the particles.
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61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
81.07.Wx Nanopowders

Observation of atmospheric pressure arc on a cold cathode

Lakshminarayana Rao, Richard J. Munz, and Sylvain Coulombe

Appl. Phys. Lett. 91, 141502 (2007); http://dx.doi.org/10.1063/1.2783179 (3 pages)

Online Publication Date: 4 October 2007

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Pictures of an atmospheric pressure arc between two concentric copper electrodes at different external magnetic fields (B field) were taken using a charge-coupled device camera and a complementary metal-oxide-semiconductor camera. The pictures reveal splitting of the arc column into a column with multiple arc roots (i.e., cathode spots), repulsion of cathode spots due to their self-induced B fields, and grouping of cathode spots under the influence of B field. Power frequency spectra analysis of the voltage fluctuations was also performed.
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52.80.Mg Arcs; sparks; lightning; atmospheric electricity
52.80.Vp Discharge in vacuum
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