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Micromachines
Special Issues
Micro-Discharges
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Micro-Discharges

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".

Deadline for manuscript submissions: closed (10 March 2023) | Viewed by 1463

Special Issue Editor

Dr. Marija Radmilović-Radjenović

E-Mail Website
Guest Editor
Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia
Interests: micro discharges; plsama modelling; dielectric barrier discharge; materials processing

Special Issue Information

Dear Colleagues,

Micro-discharges have grown into the most interesting field of the physics of collisional nonequilibrium plasmas inevitably present in everyday life. Micro-discharges have demonstrated great promise for photon, radical and ionization sources, and laboratories for plasma and optical physics. Although the initial motivation for studies of micro discharges came from the need to optimize plasma screens, new applications were developed very rapidly. Localized silicon etching, tunable UV sources, gas spectroscopy, localized treatment of materials, and assembly of nanostructures, to name a few, all have features with dimensions in the micron and sub-micron range. Plasma-based microsystems can also find application in bio-microelectromechanical system (bio-MEMS) sterilization, small-scale materials processing, and microchemical analysis systems. However, the integrability of microsystems requires not only a reduction in size but also an understanding of the physics governing the new small-scale discharges. Micro-discharges are often referred to as “high-pressure glow discharges”, since their properties fall somewhere between those attributed to glow discharges and arcs. The fact that micro-discharges operate at atmospheric pressures makes them similar to arcs. Otherwise, electron temperature and the nonequilibrium characteristics of micro discharges are similar to those of glow discharges. Micro-discharges operate under such conditions that the role of boundary-dominated phenomena becomes very important.

Dr. Marija Radmilović-Radjenović
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • micro-discharges
  • electrical breakdown
  • electrical characterization of atmospheric pressure
  • dielectric barrier discharge
  • small-scale materials processing

Published Papers (1 paper)

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Research

12 pages, 3390 KiB  
Article
Application of Micro-Arc Discharges during Anodization of Tantalum for Synthesis of Photocatalytic Active Ta2O5 Coatings
by Stevan Stojadinović, Nenad Radić and Rastko Vasilić
Micromachines 2023, 14(3), 701; https://doi.org/10.3390/mi14030701 - 22 Mar 2023
Cited by 4 | Viewed by 1198
Abstract
Ta2O5 coatings were created using micro-arc discharges (MDs) during anodization on a tantalum substrate in a sodium phosphate electrolyte (10 g/L Na3PO4·10H2O). During the process, the size of MDs increases while the number of [...] Read more.
Ta2O5 coatings were created using micro-arc discharges (MDs) during anodization on a tantalum substrate in a sodium phosphate electrolyte (10 g/L Na3PO4·10H2O). During the process, the size of MDs increases while the number of MDs decreases. The elements and their ionization states present in MDs were identified using optical emission spectroscopy. The hydrogen Balmer line Hβ shape analysis revealed the presence of two types of MDs, with estimated electron number densities of around 1.1 × 1021 m−3 and 7.3 × 1021 m−3. The effect of MDs duration on surface morphology, phase and chemical composition, optical absorption, and photoluminescent, properties of Ta2O5 coatings, as well as their applications in photocatalytic degradation of methyl orange, were investigated. The created coatings were crystalline and were primarily composed of Ta2O5 orthorhombic phase. Since Ta2O5 coatings feature strong absorption in the ultraviolet light region below 320 nm, their photocatalytic activity is very high and increases with the time of the MDs process. This was associated with an increase of oxygen vacancy defects in coatings formed during the MDs, which was confirmed by photoluminescent measurements. The photocatalytic activity after 8 h of irradiation was around 69%, 74%, 80%, and 88% for Ta2O5 coatings created after 3 min, 5 min, 10 min, and 15 min, respectively. Full article
(This article belongs to the Special Issue Micro-Discharges)
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