*Editorial* **Special Issue on "Thin Film Processes"**

## **Hyun Wook Jung**

Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; hwjung@grtrkr.korea.ac.kr

Received: 8 May 2020; Accepted: 8 May 2020; Published: 11 May 2020

Thin film processes are significantly incorporated in manufacturing display panels, secondary batteries, fuel/solar cells, catalytic films, membranes, adhesives, and other commodity films. This Special Issue on "Thin Film Processes". listed recent progresses on thin film processes, covering theoretical considerations, experimental observations, and computational techniques.

Articles in this issue consider comprehensive studies on thin film processes and related materials. Moon et al. [1] proposed the novel fabrication method of liquid crystal devices (LCD). Single-wall carbon nanotubes (SWNTs) are deposited onto a substrate via layer-by-layer (LBL) process. This SWNT LBL electrode is an appealing replacement of conventional indium tin oxide (ITO) transparent electrode for its superior optoelectronic performance. Vertically aligned LCD cells with the new electrode exhibited a voltage-transmittance curve similar to that of the conventional ITO electrode, and the enhanced display performance with the number of SWNT layers. Tang et al. [2] investigated the film growth characteristics and anti-coking performance of CVD (chemical vapor deposition)-based TiN and TiO2 anti-coking coatings. Coating growth characteristics are importantly dependent on deposition time, residence time, and partial pressure. Coking tests showed that both TiN and TiO2 coatings satisfactorily inhibited catalytic coking. Li et al. [3] compared the performances of ultrafine powder coatings with two di fferent fillers (Al(OH)3 and BaSO4). Powder coatings consist of polymer resins, fillers, curing agents, additives, and pigments. Unlike BaSO4 filler, Al(OH)3 filler contains the polar groups (hydrogen bond), which induces the chain formation between inorganic filler and organic polymer resin. Several tests were conducted to measure extensive mechanical properties of the films, and films with Al(OH)3 fillers were found to be better in mechanical properties and durability aspects. Algahtani et al. [4] conducted a series of experiments to determine the most e fficient deposition method for the ceramic surface coating with good anti-corrosion ability. SEM and optical microscope were used to observe microstructures of the coated films, and corrosion performance of the films was tested via several electrochemical experiments including inductive coupled plasma (ICP) test. Nguyen et al. [5] designed mathematical models for the drying of lemongrass using the convection drying device. Mass of lemongrass was measured under di fferent drying conditions to calculate the moisture content, and moisture di ffusivity and activation energy of the drying process were nicely fitted from raw data. Kern et al. [6] suggested an alternative approach for developing paint and coating products. The digital platform to stably sugges<sup>t</sup> the new formulation of paints from reliable data was ingeniously established. In this experiment, the digital platform e ffectively reduced the non-value-added activities and also the total throughput time. Gathering reliable safety and/or price data and formulating them into the structured form are crucial in this method. Khan et al. [7,8] and Ullah et al. [9] focused on the thin film flows on time-dependent stretching surface under the presence of the magnetic field. This magnetohydrodynamics (MHD) issue was scrutinized both numerically and analytically, giving good agreemen<sup>t</sup> with each other. The analytical results were acquired employing the homotopy analysis method (HAM).

**Conflicts of Interest:** The author declares no conflict of interest.
