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Coatings
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Plasma Surface Engineering II
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Plasma Surface Engineering II

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Plasma Coatings, Surfaces & Interfaces".

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 11353

Special Issue Editor

Prof. Dr. Jong-Shinn Wu

E-Mail Website
Guest Editor
Department of Mechanical Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan
Interests: atmospheric-pressure plasma and its applications; low-temperature plasma modeling for semiconductor materials processing; hybrid rocket propulsion, rarefied gas dynamics; parallel scientific computing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We would like to invite you to submit your recent work to this Special Issue, entitled “Plasma Surface Engineering II”, which is the result of a successful first issue. Surface engineering plays an important role in a variety of applications in modern science and engineering. Among these different techniques for surface engineering, plasma surface engineering has been termed as one of the most important and versatile technologies for many years and is still growing rapidly. Its development has been strongly supported by universities, research institutes, and industrial companies around the world.

The objective of this Special Issue is to demonstrate recent theoretical, experimental, and modeling studies, which would lead to a more widespread application of plasma surface engineering through a deeper understanding of the surface science and technologies that underly it. All original research and review papers related to this topic from leading groups around the world are welcome.

In particular, the topics of interest include, but are not limited to, the following:

  • Principles of plasma–surface interactions;
  • Methods of in situ process diagnostics of plasma-treated surfaces;
  • Simulation and modeling of growth, structure, and properties of plasma-interacted surfaces;
  • Analytics of film structures;
  • Atmospheric-pressure plasma and its application in biomedicine and biology;
  • Plasma-enhanced chemical vapor deposition and applications;
  • Physical vapor deposition through discharge processes;
  • Plasma etching, pattern transfer, and related effects and applications;
  • Plasma cleaning and functionalization;
  • Plasma surface treatment effects on adhesion and bonding;
  • Protective and tribological coatings using plasma technologies;
  • Optical coatings using plasma.

Prof. Jong-Shinn Wu
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. Coatings 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.

Published Papers (5 papers)

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Research

11 pages, 5487 KiB  
Article
Plasma-Induced Graft Polymerization of Polyethylenimine onto Chitosan/Polycaprolactone Composite Membrane for Heavy Metal Pollutants Treatment in Industrial Wastewater
by Sung-Lin Tu, Chih-Kuang Chen, Shih-Chen Shi and Jason Hsiao Chun Yang
Coatings 2022, 12(12), 1966; https://doi.org/10.3390/coatings12121966 - 15 Dec 2022
Cited by 2 | Viewed by 1842
Abstract
The present study manifests an innovative and green approach to graft metal ion adsorbent, polyethylenimine (PEI), onto an electrospun chitosan (CS)/polycaprolactone (PCL) composite membrane via atmospheric pressure nitrogen plasma grafting polymerization. FTIR absorption peak at around 1690 cm−1 was attributed to the [...] Read more.
The present study manifests an innovative and green approach to graft metal ion adsorbent, polyethylenimine (PEI), onto an electrospun chitosan (CS)/polycaprolactone (PCL) composite membrane via atmospheric pressure nitrogen plasma grafting polymerization. FTIR absorption peak at around 1690 cm−1 was attributed to the bending vibration of N-H from PEI. Since the plasma exposure time is a dependent factor of –NH bond formation, an increased nitrogen content up to 3.3% was observed with an extensive reaction time under plasma treatment. In addition, N1s spectra showed a clear PEI dominating characteristic at 401.7 eV, which suggested a successful grafting of PEI onto the CS/PCL membrane. According to the EDX analysis, a significant amount of copper ions was detected in PEI-CS/PCL membranes. This study showed that a greener wastewater treatment can be realized with the developed plasma synthesis technology. Full article
(This article belongs to the Special Issue Plasma Surface Engineering II)
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12 pages, 4224 KiB  
Article
Indoor Floor Heel Mark Removal Using Spark Discharges and Pressurized Airflow
by Yoshihiro Sakamoto, Takayoshi Tsutsumi, Hiromasa Tanaka, Kenji Ishikawa, Hiroshi Hashizume and Masaru Hori
Coatings 2022, 12(12), 1938; https://doi.org/10.3390/coatings12121938 - 09 Dec 2022
Viewed by 1297
Abstract
Heel marks (HMs), which are the black stains made by shoe soles on indoor floors, can be difficult to remove. However, this study shows how spark discharges combined with pressurized airflow in 60 s discharge treatments can remove such HMs. We further show [...] Read more.
Heel marks (HMs), which are the black stains made by shoe soles on indoor floors, can be difficult to remove. However, this study shows how spark discharges combined with pressurized airflow in 60 s discharge treatments can remove such HMs. We further show that maximizing the HM removal rates depended on the electrode gap distance because of changes in the spark discharge parameters. In our experiments, the electrical voltage waveforms are shown with voltage spikes, called spark discharges, and the spike numbers were counted in 0.6-ms time units. It was found that the number of spark discharges increases when the electrode gap distance was widened from 5 mm to 10 mm and the pressurized airflow was added, and the HM removal rates increased 11.5%, the HM removal rates could be maximized. Taken together, the results show that spark discharges combined with pressurized air can remove HMs from indoor floors without no visual damage. This paper is a preliminary report showing that HMs can be removed by plasma. Full article
(This article belongs to the Special Issue Plasma Surface Engineering II)
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17 pages, 5358 KiB  
Article
Simulation of Cold Atmospheric Plasma Generated by Floating-Electrode Dielectric Barrier Pulsed Discharge Used for the Cancer Cell Necrosis
by Samira Elaissi and Kamel Charrada
Coatings 2021, 11(11), 1405; https://doi.org/10.3390/coatings11111405 - 19 Nov 2021
Cited by 7 | Viewed by 2908
Abstract
A numerical simulation of a pulsed floating electrode dielectric barrier discharge (FE-DBD) at atmospheric pressure, used for melanoma cancer cell therapy, is performed using a plasma model in COMSOL Multiphysics software. Distributions of electron density, space charge, and electric field are presented at [...] Read more.
A numerical simulation of a pulsed floating electrode dielectric barrier discharge (FE-DBD) at atmospheric pressure, used for melanoma cancer cell therapy, is performed using a plasma model in COMSOL Multiphysics software. Distributions of electron density, space charge, and electric field are presented at different instants of the pulsed argon discharge. Significant results related to the characteristics of the plasma device used, the inter-electrodes distance, and the power supply are obtained to improve the efficiency of FE-DBD apparatus for melanoma cancer cell treatment. The FE-DBD presents a higher sensitivity to short pulse durations, related to the accumulated charge over the dielectric barrier around the powered electrode. At higher applied voltage, more energy is injected into the discharge channel and an increase in electron density and electric consumed power is noted. Anticancer activity provided by the FE-DBD plasma is improved using a small interelectrode distance with a high electron emission coefficient and a high dielectric constant with a small dielectric thickness, allowing higher electron density, generating reactive species responsible for the apoptosis of tumor cells. Full article
(This article belongs to the Special Issue Plasma Surface Engineering II)
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8 pages, 23053 KiB  
Article
Effect of Substrate Biasing on the Epitaxial Growth and Structural Properties of RF Magnetron Sputtered Germanium Buffer Layer on Silicon
by Gui-Sheng Zeng, Chi-Lung Liu and Sheng-Hui Chen
Coatings 2021, 11(9), 1060; https://doi.org/10.3390/coatings11091060 - 02 Sep 2021
Cited by 2 | Viewed by 2573
Abstract
High-quality single-crystal-like Ge (004) thin films have been epitaxially grown using radio-frequency magnetron sputtering on Si (001) substrates successfully. The crystalline quality of the Ge films can be obviously improved by applying a positive bias on the substrate holder. X-ray diffraction measurements show [...] Read more.
High-quality single-crystal-like Ge (004) thin films have been epitaxially grown using radio-frequency magnetron sputtering on Si (001) substrates successfully. The crystalline quality of the Ge films can be obviously improved by applying a positive bias on the substrate holder. X-ray diffraction measurements show that the single-crystal-like Ge film has a narrow full width at half maximum of 0.26°. The perpendicular lattice constant (aGe⊥) and in-plane lattice constant (aGe∥) are 0.5671 and 0.564 nm. The Raman shift full width at half maximum shows that the defects in the film are obviously reduced. Transmission electron microscopy diffraction patterns also show that the Ge (004) film has good crystalline quality. The results can be applied as Ge buffer layers on Si substrates for the fabrication of high-efficiency III–V solar cells and photodetectors. Full article
(This article belongs to the Special Issue Plasma Surface Engineering II)
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18 pages, 5524 KiB  
Article
Plasma-Induced Hemi-Wicking on Sanded Polymer Surfaces
by Po-Hsien Chiu, Ching-Jung Wu, Chun-Ping Hsiao, Chih-Tung Liu, Mu-Chien Wu and Jong-Shinn Wu
Coatings 2021, 11(8), 871; https://doi.org/10.3390/coatings11080871 - 21 Jul 2021
Cited by 1 | Viewed by 1956
Abstract
In this paper, a plasma-induced hemi-wicking phenomenon observed on hydrophobic sanded polymer surfaces, polypropylene (PP), polyethylene terephthalate (PET) and polyethylene (PE) is reported. An atmospheric-pressure argon plasma jet was used to treat a limited area of the carefully sanded polymer surfaces to induce [...] Read more.
In this paper, a plasma-induced hemi-wicking phenomenon observed on hydrophobic sanded polymer surfaces, polypropylene (PP), polyethylene terephthalate (PET) and polyethylene (PE) is reported. An atmospheric-pressure argon plasma jet was used to treat a limited area of the carefully sanded polymer surfaces to induce the hemi-wicking phenomenon. Such hemi-wicking triggered by the plasma activation is different from the traditional type, which is achieved purely by the surface topography. Surface analyses by X-ray photoelectron spectroscopy (XPS) and water contact analysis (WCA) show that the combination of sanding and plasma treatment increased the oxygen-to-carbon ratio, which is highly beneficial for surface hydrophilicity. The shear stress tests show that the combination of sanding and plasma treatment can enhance the shear stress by 125%, 95%, and 296% on PP, PET, and PE, respectively. The study shows that the newly developed technique by combining the sanding and plasma processing for polymers could be a potentially useful method in future industry applications. Full article
(This article belongs to the Special Issue Plasma Surface Engineering II)
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