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18 Sep 2006

Volume 89, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 89, 121104 (2006); http://dx.doi.org/10.1063/1.2354411 (3 pages)

M. M. de Lima, M. Beck, R. Hey, and P. V. Santos
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Preparation of nanocones for immobilizing DNA probe by a low-temperature plasma plume

Guangliang Chen, Wenjun Zhao, Shihua Chen, Mingyan Zhou, Wenran Feng, Weichao Gu, and Si-ze Yang

Appl. Phys. Lett. 89, 121501 (2006); http://dx.doi.org/10.1063/1.2355477 (3 pages) | Cited 10 times

Online Publication Date: 19 September 2006

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Using allylamine monomer, a matrix of nanocones was fabricated by applying a low-temperature plasma plume without any catalysts and template. This nanocone acted as an adhesion layer immobilizing DNA probe for DNA hybridization assay. A simple conceptual model to describe the growth of the nanocones was also developed. The highest density of amino-labeled DNA probe was about 1.6 pM/cm2 confirmed by the dyed oligonucleotide, and each nanocone contained nearly 3×102 amine groups. This strategy provides a robust procedure to immobilize DNA, which is a very useful substrate for fabricating nanobiosensors.
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52.77.Dq Plasma-based ion implantation and deposition
81.07.Bc Nanocrystalline materials
81.16.Fg Supramolecular and biochemical assembly
87.85.Qr Nanotechnologies-design
87.85.Rs Nanotechnologies-applications
87.14.G- Nucleic acids
87.80.-y Biophysical techniques (research methods)

Generation of over 5 MeV carbon ions from a fibrous polytetrafluoroethylene film irradiated with a 2.4 TW, 50 fs tabletop laser

Shin-Ichiro Okihara, Masatoshi Fujimoto, Hironori Takahashi, Koji Matsukado, Shinji Ohsuka, Shin-Ichiro Aoshima, Shigetoshi Okazaki, Toshiaki Ito, and Yutaka Tsuchiya

Appl. Phys. Lett. 89, 121502 (2006); http://dx.doi.org/10.1063/1.2356084 (3 pages) | Cited 6 times

Online Publication Date: 20 September 2006

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The authors generated energetic carbon ions C4+ above 5 MeV by focusing 2.4 TW, 50 fs, 10 Hz laser pulses onto a fibrous polytetrafluoroethylene (PTFE) film. The PTFE film is composed only of carbon and fluorine and has microporous structure. A laser target made of this film is useful in generating carbon ions. A polyethyleneterephthalate film was also used as an alternative target for comparison. The results show that the number of carbon ions emitted from the PTFE target was approximately two orders of magnitude greater than that from a polyethyleneterephthalate target.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.38.Ph X-ray, γ-ray, and particle generation
52.25.Tx Emission, absorption, and scattering of particles
52.25.Os Emission, absorption, and scattering of electromagnetic radiation

Self-sensing neutralizer by means of self-ejected charged particles from ac microhollow cathode discharge

Tae Il Lee, Joo Hyon Noh, Ki Wan Park, Hyeon Seok Hwang, and Hong Koo Baik

Appl. Phys. Lett. 89, 121503 (2006); http://dx.doi.org/10.1063/1.2356309 (3 pages)

Online Publication Date: 21 September 2006

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The authors introduced a concept of self-sensing neutralization system by means of automatically ejected charged particles from alternative current microhollow cathode discharge. When the positive bias was applied to the third electrode, a real current flow was only detected during negative polarity period of voltage applied to the first electrode. On the other hand, in the case of negative bias, there was only the real current during positive polarity period. These results mean that our system shows simultaneously the self-sensing and then neutralizing characteristics in a period.
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52.80.Hc Glow; corona
52.50.Dg Plasma sources
52.20.Fs Electron collisions
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
52.25.Fi Transport properties

Plasma flame for mass purification of contaminated air with chemical and biological warfare agents

Han S. Uhm, Dong H. Shin, and Yong C. Hong

Appl. Phys. Lett. 89, 121504 (2006); http://dx.doi.org/10.1063/1.2357017 (3 pages) | Cited 7 times

Online Publication Date: 22 September 2006

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An elimination of airborne simulated chemical and biological warfare agents was carried out by making use of a plasma flame made of atmospheric plasma and a fuel-burning flame, which can purify the interior air of a large volume in isolated spaces such as buildings, public transportation systems, and military vehicles. The plasma flame generator consists of a microwave plasma torch connected in series to a fuel injector and a reaction chamber. For example, a reaction chamber, with the dimensions of a 22 cm diameter and 30 cm length, purifies an airflow rate of 5000 lpm contaminated with toluene (the simulated chemical agent) and soot from a diesel engine (the simulated aerosol for biological agents). Large volumes of purification by the plasma flame will free mankind from the threat of airborne warfare agents. The plasma flame may also effectively purify air that is contaminated with volatile organic compounds, in addition to eliminating soot from diesel engines as an environmental application.
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52.75.Hn Plasma torches
52.50.Dg Plasma sources
82.33.Xj Plasma reactions (including flowing afterglow and electric discharges)
82.33.Vx Reactions in flames, combustion, and explosions
89.20.Dd Military technology and weapons systems; arms control
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