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12 Sep 2011

Volume 99, Issue 11, Articles (11xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 99, 113501 (2011); http://dx.doi.org/10.1063/1.3634072 (3 pages)

Asif Islam Khan, Debanjan Bhowmik, Pu Yu, Sung Joo Kim, Xiaoqing Pan, Ramamoorthy Ramesh, and Sayeef Salahuddin
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Computational study of cold atmospheric nanosecond pulsed helium plasma jet in air

Doug Breden, Kenji Miki, and Laxminarayan L. Raja

Appl. Phys. Lett. 99, 111501 (2011); http://dx.doi.org/10.1063/1.3636433 (3 pages) | Cited 18 times

Online Publication Date: 12 September 2011

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A luminous plasma jet is produced when helium gas issuing into atmospheric pressure ambient air is excited by high voltage nanosecond pulsing of a dielectric covered electrode. A detailed computational modeling study of such a discharge is presented. The dynamics of streamer propagation, its dependence on the diffusional mixing layer between helium and air species, and the role of photoionization are discussed.
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52.75.-d Plasma devices
52.80.-s Electric discharges

Development of a cold atmospheric pressure microplasma jet for freeform cell printing

Halim Ayan, Eda D. Yildirim, Daphne D. Pappas, and Wei Sun

Appl. Phys. Lett. 99, 111502 (2011); http://dx.doi.org/10.1063/1.3638062 (3 pages) | Cited 1 time

Online Publication Date: 12 September 2011

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An atmospheric pressure non-thermal microplasma jet (Ø 50 μm) was developed for localized functionalization of various substrates, including polymers, to allow maskless freeform cell printing. The applied microplasma jet power ranged from 0.1 to 0.2 W without causing any damage to the polyethylene substrate. The surface characterization results demonstrate that the microplasma treatment locally changes the surface roughness and the concentration of oxygen-containing functional groups on the polyethylene surface. The biological characterization confirms that the osteoblast cells attach and survive on the plasma activated line while untreated surfaces show almost no attachment and viability.
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52.77.-j Plasma applications
81.65.-b Surface treatments

Electric propulsion using an alternating positive/negative corona discharge configuration composed of wire emitters and wire collector arrays in air

Chul Kim, Kwang-Chul Noh, Sang-Yoon Kim, and Jungho Hwang

Appl. Phys. Lett. 99, 111503 (2011); http://dx.doi.org/10.1063/1.3636409 (3 pages) | Cited 2 times

Online Publication Date: 14 September 2011

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We present a study on a corona discharge configuration exclusively composed of thin wires that provides maximal thrust performance and a compact unit staging method. The ion and air flow behaviors were experimentally and numerically investigated. The basic characteristics derived from the experiments are reported for three discharge configurations (positive, negative, and positive/negative alternation). The proposed alternating positive/negative configuration enhanced the thrust (5.4 N/m2 of maximum thrust to air flow area ratio) through the ability to achieve compact staging, compared to a previous study. In addition, two useful equations as criteria in the evaluation of the thrust performance were derived.
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52.80.Hc Glow; corona
89.40.-a Transportation
52.75.Di Ion and plasma propulsion
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