Large-Volume Plasma Device with Internally Mounted Face-Type Planar Microwave Launchers for Low-Temperature Sterilization

2015 ◽  
Vol 5 (2-4) ◽  
pp. 159-175 ◽  
Author(s):  
Mrityunjai Kumar Singh ◽  
Masaaki Nagatsu
Keyword(s):  
Low Temperature ◽  
Large Volume ◽  
Face Type ◽  
Plasma Device

scholarly journals Low-Temperature Plasma as an Approach for Inhibiting a Multi-Species Cariogenic Biofilm

2021 ◽  
Vol 11 (2) ◽  
pp. 570
Author(s):  
Leandro W. Figueira ◽  
Beatriz H. D. Panariello ◽  
Cristiane Y. Koga-Ito ◽  
Simone Duarte
Keyword(s):  
Low Temperature ◽  
Laser Scanning ◽  
Single Species ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Plasma Device ◽  
Negative Controls ◽  
Promising Source

This study aimed to determine how low-temperature plasma (LTP) treatment affects single- and multi-species biofilms formed by Streptococcus mutans, Streptococcus sanguinis, and Streptococcus gordonii formed on hydroxyapatite discs. LTP was produced by argon gas using the kINPen09™ (Leibniz Institute for Plasma Science and Technology, INP, Greifswald, Germany). Biofilms were treated at a 10 mm distance from the nozzle of the plasma device to the surface of the biofilm per 30 s, 60 s, and 120 s. A 0.89% saline solution and a 0.12% chlorhexidine solution were used as negative and positive controls, respectively. Argon flow at three exposure times (30 s, 60 s, and 120 s) was also used as control. Biofilm viability was analyzed by colony-forming units (CFU) recovery and confocal laser scanning microscopy. Multispecies biofilms presented a reduction in viability (log10 CFU/mL) for all plasma-treated samples when compared to both positive and negative controls (p < 0.0001). In single-species biofilms formed by either S. mutans or S. sanguinis, a significant reduction in all exposure times was observed when compared to both positive and negative controls (p < 0.0001). For single-species biofilms formed by S. gordonii, the results indicate total elimination of S. gordonii for all exposure times. Low exposure times of LTP affects single- and multi-species cariogenic biofilms, which indicates that the treatment is a promising source for the development of new protocols for the control of dental caries.

Electron temperature gradient turbulence induced energy flux in the large volume plasma device

2019 ◽  
Vol 26 (5) ◽  
pp. 052303
Author(s):  
Prabhakar Srivastav ◽  
Rameswar Singh ◽  
L. M. Awasthi ◽  
A. K. Sanyasi ◽  
P. K. Srivastava ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Electron Temperature ◽  
Energy Flux ◽  
Large Volume ◽  
Electron Temperature Gradient ◽  
Plasma Device

The Application of a Low-temperature Physical Plasma Device Operating Under Atmospheric Pressure Leads to the Production of Toxic NO2

2020 ◽  
Vol 40 (5) ◽  
pp. 2591-2599
Author(s):  
KARSTEN KLETSCHKUS ◽  
LYUBOMIR HARALAMBIEV ◽  
ANDREAS NITSCH ◽  
FELIX PFISTER ◽  
GERD KLINKMANN ◽  
...  
Keyword(s):  
Low Temperature ◽  
Atmospheric Pressure ◽  
Plasma Device ◽  
Physical Plasma

Low-Temperature PACVD Silicon Carbide Coatings

1991 ◽  
Vol 250 ◽  
Author(s):  
W. Halverson ◽  
G. D. Vakerlis ◽  
D. Garg ◽  
P. N. Dyer
Keyword(s):  
Silicon Carbide ◽  
Low Temperature ◽  
Large Volume ◽  
Chemical Vapor ◽  
Reaction Chamber ◽  
Metallic Substrates ◽  
3 Dimensional ◽  
Carbide Coatings ◽  
Reactor Operating ◽  
Wear Tests

AbstractPlasma-assisted chemical vapor deposition (PACVD) is used extensively to coat planar (2-dimensional) substrates. In principle, the technique can be used to deposit coatings on 3-dinensional objects. However, extending PACVD to coat 3-dimensional objects uniformly requires careful control of the plasma, substrate temperature, and reactant concentrations over a large volume. A novel low-temperature radio frequency PACVD reactor design was developed to deposit coatings uniformly and reproducibly on 3-dimensional metallic substrates. The design features a temperature-controlled reaction chamber fitted with one or more rf-driven electrodes to generate uniform, large-volume plasma. The reactor was used to develop a series of silicon carbide coatings, which were deposited at or below 500°C. The coatings contain SiC and varying amounts of free silicon and/or amorphous carbon (diamond-like carbon), depending on reagent gas composition and reactor operating parameters. The coatings significantly reduced wear on stainless steel samples in ball-on-disk and abrasive wear tests and provided oxidation protection to molybdenum and titanium alloy.

A large volume plasma device

2001 ◽  
Vol 72 (10) ◽  
pp. 3864-3872 ◽  
Author(s):  
S. K. Mattoo ◽  
V. P. Anitha ◽  
L. M. Awasthi ◽  
G. Ravi ◽  
Keyword(s):  
Large Volume ◽  
Plasma Device

A 5 kA pulsed power supply for inductive and plasma loads in large volume plasma device

2016 ◽  
Vol 87 (7) ◽  
pp. 073501 ◽  
Author(s):  
P. K. Srivastava ◽  
S. K. Singh ◽  
A. K. Sanyasi ◽  
L. M. Awasthi ◽  
S. K. Mattoo
Keyword(s):  
Large Volume ◽  
Power Supply ◽  
Pulsed Power ◽  
Pulsed Power Supply ◽  
Plasma Device

Investigations of nonlinear structures in large volume plasma device

2014 ◽  
Author(s):  
S. K. Singh ◽  
L. M. Awasthi ◽  
S. K. Mattoo ◽  
R. Jha ◽  
P. K. Srivastava ◽  
...  
Keyword(s):  
Large Volume ◽  
Nonlinear Structures ◽  
Plasma Device

The Influence on Hydrophilic after the Surface Treatment of the Singed Gray Fabric by the Low Temperature Plasma

2011 ◽  
Vol 331 ◽  
pp. 708-712
Author(s):  
Peng Li ◽  
Shen Jun Zhang ◽  
Shou Guo Wang
Keyword(s):  
Low Temperature ◽  
Surface Treatment ◽  
Plasma Treatment ◽  
Cotton Fabric ◽  
Scientific Basis ◽  
Surface Treatments ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Plasma Technique ◽  
Plasma Device

We carried on the surface treatments to the cotton fabric (singed and hadn't been singed) with the low temperature plasma device. We studied the desizing performances, compared the capillaries. The results showed that after the same plasma treatment, the intensity of the singed hydrophilic was similar to those that hadn't been singed yet. We also explained the influence on hydrophilic, the results provide a scientific basis for the using of the pretreatment plasma technique in the future.

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