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8 Mar 2010

Volume 96, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 96, 101501 (2010); http://dx.doi.org/10.1063/1.3352316 (3 pages)

Bomi Gweon, Daeyeon Kim, Dan Bee Kim, Heesoo Jung, Wonho Choe, and Jennifer H. Shin
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Plasma effects on subcellular structures

Bomi Gweon, Daeyeon Kim, Dan Bee Kim, Heesoo Jung, Wonho Choe, and Jennifer H. Shin

Appl. Phys. Lett. 96, 101501 (2010); http://dx.doi.org/10.1063/1.3352316 (3 pages) | Cited 7 times

Online Publication Date: 8 March 2010

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Atmospheric pressure helium plasma treated human hepatocytes exhibit distinctive zones of necrotic and live cells separated by a void. We propose that plasma induced necrosis is attributed to plasma species such as oxygen radicals, charged particles, metastables and/or severe disruption of charged cytoskeletal proteins. Interestingly, uncharged cytoskeletal intermediate filaments are only minimally disturbed by plasma, elucidating the possibility of plasma induced electrostatic effects selectively destroying charged proteins. These bona fide plasma effects, which inflict alterations in specific subcellular structures leading to necrosis and cellular detachment, were not observed by application of helium flow or electric field alone.
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87.53.-j Effects of ionizing radiation on biological systems
87.50.cf Biophysical mechanisms of interaction
87.17.-d Cell processes
87.15.Pc Electronic and electrical properties
52.40.-w Plasma interactions (nonlaser)

Strong drive compression of a gas-cooled positron plasma

D. B. Cassidy, R. G. Greaves, V. E. Meligne, and A. P. Mills

Appl. Phys. Lett. 96, 101502 (2010); http://dx.doi.org/10.1063/1.3354005 (3 pages) | Cited 1 time

Online Publication Date: 8 March 2010

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The use of rotating electric fields to control plasmas has found numerous applications in the manipulation and storage of antimatter. When used in strong magnetic fields plasma heating caused by the applied field is mitigated by cyclotron cooling, leading to an efficient broadband mode of compression known as the strong drive regime. We have found that it is possible to access the strong drive regime in a low field trap where cyclotron cooling is negligible and a gas is used for cooling, and we have been able to compress positron plasmas to more than 10% of the Brillouin density limit.
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52.50.-b Plasma production and heating
52.55.-s Magnetic confinement and equilibrium
98.80.-k Cosmology

Acoustic stabilization of electric arc instabilities in nontransferred plasma torches

V. Rat and J. F. Coudert

Appl. Phys. Lett. 96, 101503 (2010); http://dx.doi.org/10.1063/1.3354007 (3 pages) | Cited 4 times

Online Publication Date: 8 March 2010

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Electric arc instabilities in dc plasma torches lead to nonhomogeneous treatments of nanosized solid particles or liquids injected within thermal plasma jets. This paper shows that an additional acoustic resonator mounted on the cathode cavity allows reaching a significant damping of these instabilities, particularly the Helmholtz mode of arc oscillations. The acoustic resonator is coupled with the Helmholtz resonator of the plasma torch limiting the amplitude of arc voltage variations. It is also highlighted that this damping is dependent on friction effects in the acoustic resonator.
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52.35.Qz Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.)
52.75.Hn Plasma torches
52.80.Mg Arcs; sparks; lightning; atmospheric electricity

Evolution of electron temperature in low pressure magnetized capacitive plasma

S. J. You, G. Y. Park, J. H. Kwon, J. H. Kim, H. Y. Chang, J. K. Lee, D. J. Seong, and Y. H. Shin

Appl. Phys. Lett. 96, 101504 (2010); http://dx.doi.org/10.1063/1.3309589 (3 pages) | Cited 4 times

Online Publication Date: 10 March 2010

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The evolution of electron temperature in a low pressure magnetized capacitive discharge was investigated under the collisionless electron heating regime. The results showed that while the electron temperature increases monotonously with the magnetic field in previous study [ Turner et al., Phys. Rev. Lett. 76, 2069 (1996) ], the electron temperature in our experiment exhibited nonmonotonic evolution behavior with the magnetic field. This nonmonotonic evolution of the electron temperature with the magnetic field was shown to be a combined effect of suppressing electron resonance heating and enhancing collisional heating while increasing the magnetic field.
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52.25.Xz Magnetized plasmas
52.80.-s Electric discharges
52.20.Fs Electron collisions

Self-organization of SiO2 nanodots deposited by chemical vapor deposition using an atmospheric pressure remote microplasma

G. Arnoult, T. Belmonte, and G. Henrion

Appl. Phys. Lett. 96, 101505 (2010); http://dx.doi.org/10.1063/1.3360228 (3 pages) | Cited 11 times

Online Publication Date: 12 March 2010

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Self-organization of SiO2 nanodots is obtained by chemical vapor deposition out of hexamethyldisiloxane (HMDSO) and atmospheric pressure remote Ar–O2 plasma operating at high temperature (1200–1600 K). The dewetting of the film being deposited when it is still thin enough (<500 nm) is found to be partly responsible for this self-organization. When the coating becomes thicker ( ∼ 1 μm), and for relatively high contents in HMDSO, SiO2 walls forming hexagonal cells are obtained on a SiO2 sublayer. For thicker coatings (>1 μm), droplet-shaped coatings with a Gaussian distribution in thickness over their width are deposited. The coatings are submitted to high compressive stress. When it is relaxed, “nestlike structures” made of nanoribbons are synthesized.
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81.16.Dn Self-assembly
52.77.Dq Plasma-based ion implantation and deposition
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
68.55.A- Nucleation and growth
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
68.55.jd Thickness
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