scholarly journals Evaluation of Coating Film Formation Process Using the Fluorescence Method

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1076
Author(s):  
Ayako Yano ◽  
Kyoichi Hamada ◽  
Kenji Amagai
Keyword(s):  
Film Thickness ◽  
Formation Process ◽  
Film Formation ◽  
Injection Pressure ◽  
Measurement Range ◽  
Fluorescence Method ◽  
Coating Film ◽  
Coating Films ◽  
Tracer Particles ◽  
Overlap Ratio

In this paper, we invented a novel observation method of the coating film formation process using the fluorescence method. With this method, the temporal change in the coating film thickness can be evaluated quantitatively. In addition, since the thickness and flow of the coating film can be measured simultaneously, the detailed coating film formation process was clarified. In the experiment, the adhesion behavior of the spray-paint droplets when applied to a wall was investigated. The characteristics of coating films formed by the spray droplets, particularly the influence of injection pressure on the coating film formation, were determined using the fluorescence method. At the initial stage of the coating process, the coating area increased linearly. When the ratio of the coating area to the measurement range reached about 80%, the rate at which the coating area increased slowed down, and an overlap began. The amount of paint that adhered to the coating film formation could be estimated by calculating the overlap ratio. Moreover, the thickness and smoothness of the coating film were evaluated using the histogram data of the fluorescence intensity. The leveling process was discussed in relation to the standard deviation of the histogram data. In addition, the flow of the paint during the coating film formation was investigated using tracer particles, and the effect of the spray gun injection pressure on the leveling process was investigated. Changes in the film thickness and flow during the coating film formation process could be evaluated through fluorescence observation.

scholarly journals Development of a simultaneous measurement system for SAXS–WAXD and the thickness of coating films during film formation by solvent evaporation

2014 ◽  
Vol 47 (1) ◽  
pp. 476-481 ◽  
Author(s):  
Keisuke Shimokita ◽  
Tsukasa Miyazaki ◽  
Hiroki Ogawa ◽  
Katsuhiro Yamamoto
Keyword(s):  
Methyl Methacrylate ◽  
Formation Process ◽  
Simultaneous Measurement ◽  
Film Formation ◽  
Solvent Evaporation ◽  
Coating Film ◽  
Coating Films ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
X Ray Absorption

A system for the simultaneous measurement of small-angle X-ray scattering and wide-angle X-ray diffraction (SAXS–WAXD) and the thickness of a coating film, obtained with an automatic coater, during film formation has been developed. The system was installed on beamline BL03XU at SPring-8. As model specimens, poly(methyl methacrylate)-b-poly(n-butyl acrylate)-b-poly(methyl methacrylate) (PMMA-b-PnBA-b-PMMA) triblock copolymers with different compositions were used to investigate the film formation process during solvent evaporation. First of all, the data correction methods were examined for the coating films during solvent evaporation. Since the scattering invariant was affected by the scattering volume and the absorption of X-rays by the solvent and the copolymer during drying, the scattering invariant should be corrected for the film width and the X-ray absorption of the sample. The polymer concentration was estimated from the thickness of the coating film during solvent evaporation, while the X-ray absorption was evaluated by using the X-ray linear absorption coefficients of the solvent and the copolymer. The results showed that the correction of the scattering invariant is crucial for an exact description of the film formation process during solvent evaporation.

scholarly journals Electrochemical Impedance Spectroscopy Study of Waterborne Epoxy Coating Film Formation

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 254 ◽  
Author(s):  
Končan Volmajervarna ◽  
Steinbücher ◽  
Berce ◽  
Venturini ◽  
Gaberšček
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Formation Process ◽  
Volume Concentration ◽  
Electrochemical Impedance ◽  
Film Formation ◽  
Coating Film ◽  
Epoxy Coatings ◽  
Pigment Volume Concentration ◽  
Corrosion Stability

The film formation process in waterborne (WB) epoxy coatings is studied using electrochemical impedance spectroscopy (EIS) measurements and dynamic mechanical analysis (DMA). Ten epoxy coatings with different pigment volume concentration were prepared on standard steel substrates and carefully monitored over four weeks (30 days). It is shown that impedance spectroscopy can serve as a very sensitive tool for accurate experimental detection of the critical pigment volume concentration. We also show that the optimal film formation process and corrosion stability of coatings are greatly affected by the coating pigment volume concentration (PVC) value. As a whole, the study confirms that the optimization of coating protection ability needs to take into account both maximization of the barrier effect as well as maximization of the degree of epoxy-amino cross-linking.

scholarly journals The Effect of Film Thickness and Content on Film Formation from PS/ Nanocomposites Prepared by Dip-Coating Method

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
M. Selin Sunay ◽  
Onder Pekcan ◽  
Saziye Ugur
Keyword(s):  
Film Thickness ◽  
Elevated Temperatures ◽  
Film Formation ◽  
Fluorescence Emission ◽  
Dip Coating ◽  
Atomic Force ◽  
Annealing Step ◽  
Coating Method ◽  
Fluorescence Emission Intensity ◽  
Dip Coating Method

Steady-state fluorescence (SSF) technique in conjunction with UV-visible (UVV) technique and atomic force microscope (AFM) was used for studying film formation from TiO2covered nanosized polystyrene (PS) latex particles (320 nm). The effects of film thickness and TiO2content on the film formation and structure properties of PS/TiO2composites were studied. For this purpose, two different sets of PS films with thicknesses of 5 and 20 μm were prepared from pyrene-(P-) labeled PS particles and covered with various layers of TiO2using dip-coating method. These films were then annealed at elevated temperatures above glass transition temperature () of PS in the range of 100–280°C. Fluorescence emission intensity, from P and transmitted light intensity, were measured after each annealing step to monitor the stages of film formation. The results showed that film formation from PS latexes occurs on the top surface of PS/TiO2composites and thus developed independent of TiO2content for both film sets. But the surface morphology of the films was found to vary with both TiO2content and film thickness. After removal of PS, thin films provide a quite ordered porous structure while thick films showed nonporous structure.

scholarly journals Paint Film Formation Process in Spray Coating

1986 ◽  
Vol 59 (12) ◽  
pp. 711-718 ◽  
Author(s):  
Kazuyuki TACHI ◽  
Chikaaki OKUDA ◽  
Yoichi OYAMA ◽  
Shouichi SUZUKI
Keyword(s):  
Formation Process ◽  
Film Formation ◽  
Paint Film ◽  
Spray Coating

Mechanical Coating Technique and Its Development as a Novel Film Formation Process

2020 ◽  
Vol 2020 (0) ◽  
pp. 16A12
Author(s):  
Yun LU ◽  
Hiroyuki YOSHIDA ◽  
Liang HAO ◽  
Sujun GUAN ◽  
Satoshi SEKI
Keyword(s):  
Formation Process ◽  
Film Formation ◽  
Coating Technique ◽  
Mechanical Coating

scholarly journals Preparation of Cellulose-Based Fluorescent Materials as Coating Pigment by Use of DMSO/DBU/CO2 System

2021 ◽  
Author(s):  
Qinghua Cao ◽  
Jinyue Dai ◽  
Xin Bao ◽  
Zhenyu Zhang ◽  
Fei Liu ◽  
...  
Keyword(s):  
Uv Light ◽  
Tensile Modulus ◽  
Coating Film ◽  
Coating Films ◽  
Fluorescence Response ◽  
Mild Conditions ◽  
Fluorescent Materials ◽  
Bright Color ◽  
Molecular Skeleton ◽  
Quenching Phenomenon

Abstract A series of cellulose-based fluorescent materials are prepared under relative mild conditions by use of the DMSO/DBU/CO2 system to utilize as coating pigments. Through the observation under 365nm UV light, the cellulose-based fluorescent materials exhibit good fluorescence response and bright color. Furthermore, due to the limitation of the molecular skeleton of cellulose, the intrinsic aggregation caused quenching phenomenon commonly existed in conventional organic fluorescent pigments can be effectively inhibited, which is very helpful to retain good fluorescence response in epoxy-based coating material and its coating films. Moreover, the addition of cellulose-based fluorescent materials also increases the mechanical properties of the coating film. The increase of tensile strength and tensile modulus respectively reaches ~39% and ~66%. Solvent resistance and thermal property of the coating films generally remain unchanged. The fabrication of cellulose-based fluorescent materials in DMSO/DBU/CO2 system provides a feasible way to develop the functional application of cellulose.

Different colloidal particle formation process between conjugated polymer and unmodified C60 in preparation of suspension for electrophoretic deposition by reprecipitation method

2021 ◽  
Author(s):  
Kazuya Tada ◽  
Daiya Fujimoto
Keyword(s):  
Molecular Weight ◽  
Electrophoretic Deposition ◽  
Formation Process ◽  
Colloidal Particle ◽  
Film Formation ◽  
Particle Formation ◽  
Large Area ◽  
Significant Difference ◽  
Reprecipitation Method ◽  
The Difference

Abstract Electrophoretic deposition provides material-efficient film formation on large area electrodes. In this study, it has been found that there is a significant difference in the colloidal particle formation process between a thiophene-based copolymer poly(3-octylthiophene- 2,5-diyl-co-3-decyloxythiophene-2,5-diyl) (POT-co-DOT) and C60 in preparation of suspension for electrophoretic deposition by reprecipitation method. This difference is attributed to the difference between low molecular weight materials with specific molecular weight and polymers with molecular weight distribution. The composition of POT-co-DOT:C60 composite film by electrophoretic deposition has also been estimated.

Elucidation of PVD MoS2 film formation process and its structure focusing on sub-monolayer region

2021 ◽  
Author(s):  
Ryo Ono ◽  
Shinya Imai ◽  
Yuta Kusama ◽  
Takuya Hamada ◽  
Masaya Hamada ◽  
...  
Keyword(s):  
Vapor Deposition ◽  
Formation Process ◽  
Physical Vapor Deposition ◽  
Film Formation ◽  
Dark Field ◽  
Film Structure ◽  
Internal Stresses ◽  
Large Area ◽  
Scanning Transmission ◽  
Annular Dark Field

Abstract Sputtering enables uniform and clean deposition over a large area, which is an issue with exfoliation and chemi-cal vapor deposition methods. On the other hand, the process of physical vapor deposition (PVD) film formationhas not yet been clarified. We prepared several samples from the sub-monolayer region, and performed Ra-man spectroscopy, X-ray photon spectroscopy and high-angle annular dark-field scanning transmission electronmicroscopy. From these results, the internal stresses inherent to PVD films, the bonding states specific to sub-monolayers, and the unique film structure and the grain formation process of PVD films were discussed fromthe perspective of sub-monolayers. As a conclusion, we found that it is important to suppress the formation ofsub-monolayers on the substrate to completely form the first layer.

Control by Mixed-Chloride Additives of the Quality and Homogeneity of Bulk Halide Perovskite upon Film Formation Process

2021 ◽  
Author(s):  
Thierry Pauporté ◽  
Daming zheng
Keyword(s):  
Solar Cells ◽  
Formation Process ◽  
High Efficiency ◽  
Film Formation ◽  
Perovskite Solar Cells ◽  
X Ray Diffraction ◽  
X Ray ◽  
Stability Issue ◽  
Halide Perovskite ◽  
The Stability

Nowadays, overcoming the stability issue of perovskite solar cells (PSCs) while keeping high efficiency has become an urgent need for the future of this technology. By using x-ray diffraction (XRD),...

Analyzing the Film Formation Process of Paint Applied in a Wet Surface

2021 ◽  
Vol 70 (5) ◽  
pp. 150-154
Author(s):  
Kunio Shimura ◽  
Yuki Ota ◽  
Takeo Yanagiguchi ◽  
Hideki Matsuda
Keyword(s):  
Formation Process ◽  
Film Formation ◽  
Wet Surface
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