Special Issue "Thin Film Processes"

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Other Topics".

Deadline for manuscript submissions: closed (31 March 2019)

Special Issue Editor

Guest Editor
Prof. Dr. Hyun Wook Jung

Department of Chemical and Biological Engineering, Korea University, Korea
Website 1 | Website 2 | E-Mail
Interests: rheology; rheological processes; coating and drying; flow instability; micro flows

Special Issue Information

Dear Colleagues,

Thin film processes are significantly incorporated in manufacturing displays, secondary batteries, fuel cells, solar cells, catalytic films, membranes, adhesives, and commodity films. Final properties of functionalized films are closely linked with applied processes, considering rheological aspects and process conditions. It is thus important to carefully scrutinize flow characteristics of materials in various processes for guaranteeing uniform and stable films.

This special issue on “Thin Film Processes” aims to address recent theoretical and experimental developments of thin film properties and related processes. Topics include, but are not limited to:

  • Fundamentals of coating and drying processes
  • Analysis of rheological processes (Film casting, film blowing, etc)
  • Characterization of various properties of thin films (Crosslinking, rheological, and mechanical properties)
  • Flow dynamics and stability in thin film processes
  • General rheology of complex fluids

Prof. Dr. Hyun Wook Jung
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 papers will be 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. Processes 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 1100 CHF (Swiss Francs). Please note that for papers submitted after 30 June 2019 an APC of 1200 CHF applies. 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

  • Film processes
  • Coating and drying
  • Rheology
  • Stability
  • Flow dynamics
  • Property characterization
  • Complex fluids

Published Papers (4 papers)

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Research

Open AccessArticle Impact of Thermal Radiation and Heat Source/Sink on MHD Time-Dependent Thin-Film Flow of Oldroyed-B, Maxwell, and Jeffry Fluids over a Stretching Surface
Processes 2019, 7(4), 191; https://doi.org/10.3390/pr7040191
Received: 1 March 2019 / Revised: 26 March 2019 / Accepted: 27 March 2019 / Published: 2 April 2019
Cited by 1 | PDF Full-text (2977 KB) | HTML Full-text | XML Full-text
Abstract
In this study paper, we examined the magnetohydrodynamic (MHD) flow of three combined fluids, Maxwell, Jeffry, and Oldroyed- B fluids, with variable heat transmission under the influence of thermal radiation embedded in a permeable medium over a time-dependent stretching sheet. The fluid flow [...] Read more.
In this study paper, we examined the magnetohydrodynamic (MHD) flow of three combined fluids, Maxwell, Jeffry, and Oldroyed- B fluids, with variable heat transmission under the influence of thermal radiation embedded in a permeable medium over a time-dependent stretching sheet. The fluid flow of liquid films was assumed in two dimensions. The fundamental leading equations were changed to a set of differential nonlinear and coupled equations. For this conversion, suitable similarity variables were used. An optimal tactic was used to acquire the solution of the modeled problems. The convergence of the technique has been shown numerically. The obtained analytical and numerical consequences are associated graphically and tabulated. An excellent agreement was obtained between the homotropy analysis method (HAM) and numerical methods. The variation of the skin friction and Nusslet number and their influence on the temperature and concentration profiles were scrutinized. The influence of the thermal radiation, unsteadiness effect, and MHD were the main focus of this study. Furthermore, for conception to be physically demonstrated, the entrenched parameters are discussed graphically in detail along with their effect on liquid film flow. Full article
(This article belongs to the Special Issue Thin Film Processes)
Figures

Figure 1

Open AccessArticle Model for Thin Layer Drying of Lemongrass (Cymbopogon citratus) by Hot Air
Processes 2019, 7(1), 21; https://doi.org/10.3390/pr7010021
Received: 7 December 2018 / Revised: 23 December 2018 / Accepted: 28 December 2018 / Published: 4 January 2019
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Abstract
Lemongrass is a plant that contains aromatic compounds (myrcene and limonene), powerful deodorants, and antimicrobial compounds (citral and geraniol). Identifying a suitable drying model for the material is crucial for establishing an initial step for the development of dried products. Convection drying is [...] Read more.
Lemongrass is a plant that contains aromatic compounds (myrcene and limonene), powerful deodorants, and antimicrobial compounds (citral and geraniol). Identifying a suitable drying model for the material is crucial for establishing an initial step for the development of dried products. Convection drying is a commonly used drying method that could extend the shelf life of the product. In this study, a suitable kinetic model for the drying process was determined by fitting moisture data corresponding to four different temperature levels: 50, 55, 60 and 65 °C. In addition, the effect of drying temperature on the moisture removal rate, the effective diffusion coefficient and activation energy were also estimated. The results showed that time for moisture removal increases proportionally with the air-drying temperature, and that the Weibull model is the most suitable model for describing the drying process. The effective diffusion coefficient ranges from 7.64 × 10−11 m2/s to 1.48 × 10−10 m2/s and the activation energy was 38.34 kJ/mol. The activation energy for lemongrass evaporation is relatively high, suggesting that more energy is needed to separate moisture from the material by drying. Full article
(This article belongs to the Special Issue Thin Film Processes)
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Figure 1

Open AccessArticle Experimental Studies on Corrosion Behavior of Ceramic Surface Coating using Different Deposition Techniques on 6082-T6 Aluminum Alloy
Processes 2018, 6(12), 240; https://doi.org/10.3390/pr6120240
Received: 24 October 2018 / Revised: 18 November 2018 / Accepted: 21 November 2018 / Published: 26 November 2018
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Abstract
Aluminum alloys cannot be used in aggressive corrosion environments application. In this paper, three different surface coating technologies were used to coat the 6082-T6 aluminum alloy to increase the corrosion resistance, namely Plasma Electrolytic Oxidation (PEO), Plasma Spray Ceramic (PSC) and Hard Anodizing [...] Read more.
Aluminum alloys cannot be used in aggressive corrosion environments application. In this paper, three different surface coating technologies were used to coat the 6082-T6 aluminum alloy to increase the corrosion resistance, namely Plasma Electrolytic Oxidation (PEO), Plasma Spray Ceramic (PSC) and Hard Anodizing (HA). The cross-sectional microstructure analysis revealed that HA coating was less uniform compared to other coatings. PEO coating was well adhered to the substrate despite the thinnest layer among all three coatings, while the PSC coating has an additional loose layer between the coat and the substrate. X-ray diffraction (XRD) analysis revealed crystalline alumina phases in PEO and PSC coatings while no phase was detected in HA other than an aluminum element. A series of electrochemistry experiments were used to evaluate the corrosion performances of these three types of coatings. Generally, all three-coated aluminum showed better corrosion performances. PEO coating has no charge transfer under all Inductive Coupled Plasma (ICP) tests, while small amounts of Al3+ were released for both HA and PSC coatings at 80 °C. The PEO coating showed the lowest corrosion current density followed by HA and then PSC coatings. The impedance resistance decreased as the immersion time increased, which indicated that this is due to the degradation and deterioration of the protective coatings. The results indicate that the PEO coating can offer the most effective protection to the aluminum substrate as it has the highest enhancement factor under electrochemistry tests compared to the other two coatings. Full article
(This article belongs to the Special Issue Thin Film Processes)
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Figure 1

Open AccessArticle Fabrication of New Liquid Crystal Device Using Layer-by-Layer Thin Film Process
Processes 2018, 6(8), 108; https://doi.org/10.3390/pr6080108
Received: 29 June 2018 / Revised: 20 July 2018 / Accepted: 26 July 2018 / Published: 1 August 2018
Cited by 1 | PDF Full-text (12293 KB) | HTML Full-text | XML Full-text
Abstract
Indium tin oxide (ITO) transparent electrodes are troubled with high cost and poor mechanical stability. In this study, layer-by-layer (LBL)-processed thin films with single-walled carbon nanotubes (SWNTs) exhibited high transparency and electrical conductivity as a candidate for ITO replacement. The repetitive deposition of [...] Read more.
Indium tin oxide (ITO) transparent electrodes are troubled with high cost and poor mechanical stability. In this study, layer-by-layer (LBL)-processed thin films with single-walled carbon nanotubes (SWNTs) exhibited high transparency and electrical conductivity as a candidate for ITO replacement. The repetitive deposition of polycations and stabilized SWNTs with a negative surfactant exhibits sufficiently linear film growth and high optoelectronic performance to be used as transparent electrodes for vertically aligned (VA) liquid crystal display (LCD) cells. The LC molecules were uniformly aligned on the all of the prepared LBL electrodes. VA LCD cells with SWNT LBL electrodes exhibited voltage-transmittance (V-T) characteristics similar to those with the conventional ITO electrodes. Although the response speeds were slower than the LCD cell with the ITO electrode, as the SWNT layers increased, the display performance was closer to the LCD cells with conventional ITO electrode. This work demonstrated the good optoelectronic performance and alignment compatibility with LC molecules of the SWNT LBL assemblies, which are potential alternatives to ITO films as transparent electrodes for LCDs. Full article
(This article belongs to the Special Issue Thin Film Processes)
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Graphical abstract

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