scholarly journals Atmospheric Pressure Dielectric Barrier Discharge Plasma-Enhanced Optical Contact Bonding of Coated Glass Surfaces

2021 ◽  
Vol 11 (15) ◽  
pp. 6755
Author(s):  
Josephine Neumann ◽  
Stephan Brückner ◽  
Wolfgang Viöl ◽  
Christoph Gerhard
Keyword(s):  
Shear Strength ◽  
Dielectric Barrier Discharge ◽  
Atmospheric Pressure ◽  
Barrier Discharge ◽  
Surface Preparation ◽  
Curing Temperature ◽  
Dbd Plasma ◽  
Functional Layer ◽  
Dielectric Barrier ◽  
The Impact

This paper reports on plasma-enhanced bonding of optics surfaces coated with highly sensitive functional layers using surface preparation by a dielectric barrier discharge (DBD) plasma. The samples to be bonded were treated with a DBD in diffuse mode at atmospheric pressure for 30 s which is applied directly to the sample surface, then joined with the aid of de-ionised water and cured subsequently. The plasma treatment itself already increased the shear strength achieved by a factor of two compared to classical wringing or direct contacting, while the curing process led to a further increase by a factor of up to five, depending on curing temperature. The observed enhancement of shear strength can be attributed to DBD plasma-induced cleaning and most likely additional activation of the surface as verified by contact angle measurements. Since the impact of the used plasma on the surface is quite gentle in comparison to other bonding processes or other plasma-based processes reported in the literature, a destruction of the treated functional layer is avoided. This advantage makes it possible to bond even optics surfaces coated with sensitive materials.

scholarly journals Virucidal Effects of Dielectric Barrier Discharge Plasma on Human Norovirus Infectivity in Fresh Oysters (Crassostrea gigas)

Foods ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1731
Author(s):  
Man-Seok Choi ◽  
Eun Bi Jeon ◽  
Ji Yoon Kim ◽  
Eun Ha Choi ◽  
Jun Sup Lim ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Dielectric Barrier Discharge ◽  
Copy Number ◽  
Barrier Discharge ◽  
Quantitative Polymerase Chain Reaction ◽  
Inactivation Kinetics ◽  
Dbd Plasma ◽  
Human Norovirus ◽  
Dielectric Barrier ◽  
The Impact

This study investigates the effects of dielectric barrier discharge (DBD) plasma treatment (1.1 kV, 43 kHz, N2 1.5 L/min, 10~60 min) on human norovirus (HuNoV) GII.4 infectivity in fresh oysters. HuNoV viability in oysters was assessed by using propidium monoazide (PMA) as a nucleic acid intercalating dye before performing a real-time reverse transcription–quantitative polymerase chain reaction (RT-qPCR). Additionally, the impact of the DBD plasma treatment on pH and Hunter colors was assessed. When DBD plasma was treated for 60 min, the HuNoV genomic titer reduction without PMA pretreatment was negligible (<1 log copy number/µL), whereas when PMA treatment was used, HuNoV titer was reduced to >1 log copy number/µL in just 30 min. D1 and D2-value of HuNoV infectivity were calculated as 36.5 and 73.0 min of the DBD plasma treatment, respectively, using the first-order kinetics model (R2 = 0.98). The pH and Hunter colors were not significantly different (p > 0.05) between the untreated and DBD-plasma-treated oysters. The results suggest that PMA/RT-qPCR could help distinguish HuNoV infectivity without negatively affecting oyster quality following >30 min treatment with DBD plasma. Moreover, the inactivation kinetics of nonthermal DBD plasma against HuNoV in fresh oysters might provide basic information for oyster processing and distribution.

Surface Modification of Polypropylene Melt Blown Non-Woven Using Atmospheric Pressure Dielectric Barrier Discharge Plasma

2010 ◽  
Vol 42 ◽  
pp. 228-231 ◽  
Author(s):  
Yan Zhang ◽  
Yin Ding Lv
Keyword(s):  
Dielectric Barrier Discharge ◽  
Atmospheric Pressure ◽  
Barrier Discharge ◽  
Treatment Time ◽  
Woven Fabric ◽  
Dbd Plasma ◽  
Water Contact ◽  
Dielectric Barrier ◽  
Barrier Discharge Plasma ◽  
Plasma Treatment Time

In this paper, polypropylene (PP) melt blown non-woven fabric is treated by atmospheric pressure N2 or N2/CO2 dielectric barrier discharge (DBD) plasma. The variation of the surface hydrophilicity of PP sample is experimentally investigated by surface water contact angle, Fourier transform infrared reflectance spectroscopy (FTIR-ATR). The results show that the hydrophilicity of PP sample is considerably improved as long as the very short plasma treatment time (several seconds). However, the treatment effect of atmospheric N2/CO2 plasma is worse than that of atmospheric N2 plasma.

scholarly journals INHIBITION OF CANDIDA ALBICANS GROWTH ON SURFACES TREATED BY DIELECTRIC BARRIER DISCHARGE WITH VARIOUS BARRIERS

2014 ◽  
Vol 54 (4) ◽  
pp. 290-294 ◽  
Author(s):  
Jan Sláma ◽  
Vítezslav Kríha
Keyword(s):  
Candida Albicans ◽  
Dielectric Barrier Discharge ◽  
Atmospheric Pressure ◽  
Barrier Discharge ◽  
Low Temperature Plasma ◽  
Dbd Plasma ◽  
Barrier Material ◽  
Temperature Plasma ◽  
Dielectric Barrier ◽  
Non Destructive

Discharges generating low temperature plasma at atmospheric pressure have the potential to treat surfaces biologically contaminated by organic matter in a non-destructive manner. We have been studying ways of inhibiting the growth of microorganisms with the use of dielectric barrier discharge (DBD) plasma. The effect of the choice of a barrier material and its thickness on the<br />germicide properties of the DBD is described. We used Saboraud agar inoculated by 10<sup>5</sup> cfu/cm<sup>2</sup> of <em>Candida albicans</em> yeast as the model contaminated surface. After cultivation, the proportion of the treated surface with no <em>C. albicans</em> colony was evaluated.

scholarly journals Reel-to-Reel Atmospheric Pressure Dielectric Barrier Discharge (DBD) Plasma Treatment of Polypropylene Films

2017 ◽  
Vol 7 (4) ◽  
pp. 337 ◽  
Author(s):  
Lukas Seidelmann ◽  
James Bradley ◽  
Marina Ratova ◽  
Jonathan Hewitt ◽  
Jamie Moffat ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Dielectric Barrier Discharge ◽  
Atmospheric Pressure ◽  
Barrier Discharge ◽  
Dbd Plasma ◽  
Dielectric Barrier ◽  
Polypropylene Films

Surface Wettability of Polypropylene Non-Woven Using Atmospheric Pressure N2 Dielectric Barrier Discharge Plasma

2010 ◽  
Vol 455 ◽  
pp. 472-475
Author(s):  
Yan Zhang ◽  
Bo Zhao ◽  
Jing Lin Tong
Keyword(s):  
Dielectric Barrier Discharge ◽  
Photoelectron Spectroscopy ◽  
Atmospheric Pressure ◽  
Barrier Discharge ◽  
Chemical Properties ◽  
Angle Measurement ◽  
Surface Wettability ◽  
Dbd Plasma ◽  
Water Contact ◽  
Dielectric Barrier

In this thesis, the atmospheric pressure nitrogen dielectric barrier discharge (DBD) plasma modified polyproylene (PP) melt blown non-woven surface wettability are investigated. The change of surfaces physical and chemical properties are studied by water contact angle measurement and X-ray photoelectron spectroscopy (XPS) before and after plasma treatment. The experimental results indicate the surface hydrophilic can be greatly improved when the PP simples is treated by atmospheric pressure nitrogen DBD plasma for a short time. And a large number of oxygen-containing and nitrogen-containing functional groups are inplanted on the PP non-woven sample surface.

Effects of Atmospheric Pressure Dielectric Barrier Discharge Plasma Irradiation on Yeast Growth

2012 ◽  
Vol 1469 ◽  
Author(s):  
Satoshi Kitazaki ◽  
Kazunori Koga ◽  
Masaharu Shiratani ◽  
Nobuya Hayashi
Keyword(s):  
Dielectric Barrier Discharge ◽  
Atmospheric Pressure ◽  
Barrier Discharge ◽  
Growth Promotion ◽  
Lag Phase ◽  
Dielectric Barrier Discharge Plasma ◽  
Dbd Plasma ◽  
Dielectric Barrier ◽  
Plasma Irradiation ◽  
Barrier Discharge Plasma

ABSTRACTWe investigated effects of atmospheric pressure dielectric barrier discharge (DBD) plasma irradiation on growth characteristics of bread yeast (Saccharomyces cerevisie). Nitric oxide of 400 ppm and O3above 200 ppm are produce by the DBD plasmas. DBD plasma irradiation of 50 and 100 s enhances the growth of yeast in the lag phase, whereas 150 s irradiation suppresses the growth. There is an optimum duration of plasma irradiation for the growth promotion.

Inactivation of yeast by dielectric barrier discharge (DBD) plasma in helium at atmospheric pressure

2005 ◽  
Vol 33 (4) ◽  
pp. 1405-1409 ◽  
Author(s):  
Hong Yu ◽  
Zhi Long Xiu ◽  
Chun Sheng Ren ◽  
Jia Liang Zhang ◽  
De Zhen Wang ◽  
...  
Keyword(s):  
Dielectric Barrier Discharge ◽  
Atmospheric Pressure ◽  
Barrier Discharge ◽  
Dbd Plasma ◽  
Dielectric Barrier

scholarly journals Study on Chemical Modifications of Glutathione by Cold Atmospheric Pressure Plasma (Cap) Operated in Air in the Presence of Fe(II) and Fe(III) Complexes

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Dariusz Śmiłowicz ◽  
Friederike Kogelheide ◽  
Katharina Stapelmann ◽  
Peter Awakowicz ◽  
Nils Metzler-Nolte
Keyword(s):  
Transition Metal ◽  
Dielectric Barrier Discharge ◽  
Atmospheric Pressure ◽  
Sulfonic Acid ◽  
Barrier Discharge ◽  
Atmospheric Pressure Plasma ◽  
Chemical Modifications ◽  
Dbd Plasma ◽  
Dielectric Barrier ◽  
Cold Atmospheric Pressure Plasma

AbstractCold atmospheric pressure plasma is an attractive new research area in clinical trials to treat skin diseases. However, the principles of plasma modification of biomolecules in aqueous solutions remain elusive. It is intriguing how reactive oxygen and nitrogen species (RONS) produced by plasma interact on a molecular level in a biological environment. Previously, we identified the chemical effects of dielectric barrier discharges (DBD) on the glutathione (GSH) and glutathione disulphide (GSSG) molecules as the most important redox pair in organisms responsible for detoxification of intracellular reactive species. However, in the human body there are also present redox-active metals such as iron, which is the most abundant transition metal in healthy humans. In the present study, the time-dependent chemical modifications on GSH and GSSG in the presence of iron(II) and iron(III) complexes caused by a dielectric barrier discharge (DBD) under ambient conditions were investigated by IR spectroscopy, mass spectrometry and High Performance Liquid Chromatography (HPLC). HPLC chromatograms revealed one clean peak after treatment of both GSH and GSSH with the dielectric barrier discharge (DBD) plasma, which corresponded to glutathione sulfonic acid GSO3H. The ESI-MS measurements confirmed the presence of glutathione sulfonic acid. In our experiments, involving either iron(II) or iron(III) complexes, glutathione sulfonic acid GSO3H appeared as the main oxidation product. This is in sharp contrast to GSH/GSSG treatment with DBD plasma in the absence of metal ions, which gave a wild mixture of products. Also interesting, no nitrosylation of GSH/GSSG was oberved in the presence of iron complexes, which seems to indicate a preferential oxygen activation chemistry by this transition metal ion.

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