Study of the Influence of Variation in Distances Between Electrodes in Spectral DBD Plasma Excitation

Souza, Ivan Alves de; Neto, Arlindo Balbino do Nascimento; Queiroz, J. C. A.; Matamoros, Efrain Pantaleón; Costa, Thércio Henrique de Carvalho; Feitor, Michelle Cequeira; Souza, John; Camara, Nailton Torres; Sobrinho, Valmar da Silva Severiano

doi:10.1590/1980-5373-mr-2015-0205

Cited by 12 publications

(12 citation statements)

References 19 publications

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“…Currently, the road in NTP research and development points to an increasing importance for application‐oriented plasma sources because of their differences in design, performance and application, depending on the respective task. The number of different NTP sources including plasma needles (Stoffels, Flikweert et al , ; Bora, Aguilera et al , ; Mohammed and Abas, ), plasma jets (Fricke, Koban et al , ; Xu, Shen et al , ; Xu, Shen et al , ), dielectric barrier discharge (DBD; Pietsch, , de Souza, Neto et al , , Offerhaus, Lackmann et al , ) or microwave‐induced plasmas (Jovicevic, Ivkovic et al , ; Baeva, Bösel et al , ) is constantly growing.…”

Section: Discussionmentioning

confidence: 99%

Antimicrobial effects of microwave‐induced plasma torch (MiniMIP) treatment on Candida albicans biofilms

Handorf

Schnabel

Bösel

et al. 2019

Microbial Biotechnology

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Summary The susceptibility of Candida albicans biofilms to a non‐thermal plasma treatment has been investigated in terms of growth, survival and cell viability by a series of in vitro experiments. For different time periods, the C. albicans strain SC5314 was treated with a microwave‐induced plasma torch (MiniMIP). The MiniMIP treatment had a strong effect (reduction factor (RF) = 2.97 after 50 s treatment) at a distance of 3 cm between the nozzle and the superior regions of the biofilms. In addition, a viability reduction of 77% after a 20 s plasma treatment and a metabolism reduction of 90% after a 40 s plasma treatment time were observed for C. albicans. After such a treatment, the biofilms revealed an altered morphology of their cells by atomic force microscopy (AFM). Additionally, fluorescence microscopy and confocal laser scanning microscopy (CLSM) analyses of plasma‐treated biofilms showed that an inactivation of cells mainly appeared on the bottom side of the biofilms. Thus, the plasma inactivation of the overgrown surface reveals a new possibility to combat biofilms.

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Section: Discussionmentioning

confidence: 99%

Antimicrobial effects of microwave‐induced plasma torch (MiniMIP) treatment on Candida albicans biofilms

Handorf

Schnabel

Bösel

et al. 2019

Microbial Biotechnology

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“…In the first analysis, it is visible that both regimes have an excitation of the nitrogen molecules of the second positive system 8,13 , associated to energy levels and 14 region of electromagnetic emission of UVA. The homogeneity of the plasma in diffuse regime is quite visible, extrapolating even the area delimited by the upper electrode, Figure 5A.…”

Section: A Optical Emission Spectroscopy (Oes)mentioning

confidence: 99%

“…It is also used for film deposition 5,6 , dental treatments and dermatological treatments 7 . According to Xi-Ming Zhu, when the work gas is the atmospheric air, the main active species generated are the nitrogen molecules (N2) 8 . There are reports that the use of active N2 species improves soil properties, enabling their use in agriculture 9 , besides it acts as a sterilizer agent eliminating microorganisms 10 .…”

Section: Introductionmentioning

confidence: 99%

“…However, it is still necessary to develop studies to master and understand the chemical, physical and existing mechanisms in the DBD plasma and how the adopted parameters have influence and interact in the emergence of the various active species, electrical fields, UV radiation, free radicals, atoms and electronically excited molecules existing in DBD plasma 8 .…”

Section: Introductionmentioning

confidence: 99%

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Triple Langmuir Probe for Diagnosis of Plasma Produced by Dielectric Barrier Discharge of Parallel Plates in Atmospheric Pressure

I¹,

J²,

A³

et al. 2019

Preprint

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This work aimed to characterize a DBD plasma equipment through optical and electrical measurements, seeking to obtain a greater knowledge of the plasma production process and how it behaves through the adopted parameters, such as frequency and voltage applied between electrodes, at a fixed distance of 1.7 mm. In order to measure them, three different characterization techniques were applied. The first method was the Lissajous figures, a technique quite effective for a complete electrical characterization of DBD equipment. The second technique used was the Optical Emission Spectroscopy, a tool used for the diagnosis of plasma, being it possible to identify the excited species produced in filamentary and diffuse discharge in the plasma. And finally, the triple Langmuir probe technique was used to obtain the electron temperature and electron density. Based on this study, it was possible to identify the equipment efficiency in different regimes. The electron temperature measurement for both systems analyzed were 27.96 eV and 20.69 eV to the filamentary and diffuse regimes, respectively. The density of electrons number to these regimes were 1.09 × 1021 m−3 and 1.56 × 1021 m−3.

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“…An atmospheric-pressure dielectric barrier discharge (AP-DBD) can be generated by injecting into the reactor gap a working gas such as helium, argon, nitrogen, oxygen, air, etc or a mixture of them, while at least two electrodes are energized by an electric power supply such as DC pulsed or AC, where the excitation frequency can range from line frequency [1] to high frequency [2]. The required voltage ranges, from a few kilovolts [3,4] to dozens of kilovolts [5,6], should establish an intense electric field across the gap sufficient to overcome the dielectric breakdown voltage of the applied gas, promoting ionization phenomena of some gas particles and, as a consequence, producing an atmospheric-pressure nonthermal plasma. It is out of thermodynamic equilibrium because the electron temperature is higher than the temperature of the ions or the neutral species.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric-pressure dielectric barrier discharge generation by a full-bridge flying capacitor multilevel inverter

Peña‐Eguiluz

López-Fernández

Mercado-Cabrera

2017

Plasma Sci. Technol.

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A new configuration of a resonant full-bridge flying capacitor multicell inverter has been designed and constructed with the aim of achieving an extended output voltage frequency range with low harmonic distortion and reduced semiconductor commutation losses. This configuration was tested as a power supply for two different coaxial dielectric barrier discharge reactors, one of them employed for electric characterization and the other one for inorganic compound elimination in an aqueous solution. Two different gas mixtures, 90% Ar-10% O 2 and 80% Ar-20% O 2 , were individually supplied during the experiments; the results showed a highefficiency removal of meta-cresol (m-cresol) to the order of 98%, which was obtained by adding more oxygen to the plasma gas mixture.

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Study of the Influence of Variation in Distances Between Electrodes in Spectral DBD Plasma Excitation

Cited by 12 publications

References 19 publications

Antimicrobial effects of microwave‐induced plasma torch (MiniMIP) treatment on Candida albicans biofilms

Antimicrobial effects of microwave‐induced plasma torch (MiniMIP) treatment on Candida albicans biofilms

Triple Langmuir Probe for Diagnosis of Plasma Produced by Dielectric Barrier Discharge of Parallel Plates in Atmospheric Pressure

Atmospheric-pressure dielectric barrier discharge generation by a full-bridge flying capacitor multilevel inverter

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