Process model for multilayer slide coating of polymer electrolyte membrane fuel cells / Kristianto Tjiptowidjojo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 73-81 Titre : Process model for multilayer slide coating of polymer electrolyte membrane fuel cells Type de document : texte imprimé Auteurs : Kristianto Tjiptowidjojo, Auteur ; Janghoon Park, Auteur ; Scott A. Mauger, Auteur ; Michael Ulsh, Auteur ; Peter Randall Schunk, Auteur Année de publication : 2022 Article en page(s) : p. 73-81 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eléments finis, Méthode des Encre Equations Fluides, Mécanique des Piles à combustible Revêtements multicouches Slide coating Index. décimale : 667.9 Revêtements et enduits Résumé : Slide coating is a precision method suitable for depositing multiple liquid-film layers simultaneously. Originally developed in the photographic film industry, it has been deployed for manufacturing of other products that benefit from multilayer coatings. One emerging application is the manufacture of polymer electrolyte membrane fuel cells (PEMFCs), which are used to produce electricity through electrochemical reactions of hydrogen and oxygen gas. The membrane-electrode assembly (MEA), in which key electrochemical reactions occur, consists of three layers that are typically deposited separately in serial fashion and then laminated together to form the three-layer MEA, i.e., three sequential steps of coat and dry. Adapting the process to simultaneous, multilayer slide coating of all three layers will save equipment cost and space while minimizing possible exposure to contaminants during transition between the steps. We are developing a three-layer slide coating model to aid the manufacturing process design of PEMFC. The model accounts for rheology of each layer, which typically exhibit shear thinning behavior. Model predictions are used to investigate simultaneous coatability of catalyst inks and to determine the best layer-by-layer ink selection. Note de contenu : - Governing equations and solution method - Table 1 Geometry description of slide die used in this study. Refer to Fig. 1 for the nomenclature - Table 2 Physical properties of inks used in the slide coating flow model. No surface tension and contact angles values needed for Nafion due to being in the middle layer DOI : https://doi.org/10.1007/s11998-021-00508-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00508-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37146 [article]

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Roll-to-roll gravure printing of thick-film silver electrode micropatterns for flexible printed circuit board / Kee-Hyun Shin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 1 (01/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 1 (01/2017) . - p. 95-106 Titre : Roll-to-roll gravure printing of thick-film silver electrode micropatterns for flexible printed circuit board Type de document : texte imprimé Auteurs : Kee-Hyun Shin, Auteur ; Ho Anh Duc Nguyen, Auteur ; Janghoon Park, Auteur ; Dongjun Shin, Auteur ; Dongjin Lee, Auteur Année de publication : 2017 Article en page(s) : p. 95-106 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argent Couches minces Electrodes Electronique imprimée Encre d'imprimerie Polyimides Rotogravure Index. décimale : 667.9 Revêtements et enduits Résumé : This paper presents a novel method for printing thick silver electrodes with high fidelity using a rotogravure technique and high-viscosity silver ink. The widths and thicknesses of the printed electrodes were investigated with respect to the printing angle and printing speed. In addition, the use of a low-surface-energy polyethylene terephthalate substrate was found to decrease the ink transfer for printing angles of up to 60°, possibly because of the small adhesive force at the interface between the ink and substrate. We therefore employed substrates with higher surface energies, namely polyimide and treated polyimide, to enhance the ink transfer. A lower printing speed of 0.5 m/min and high viscosity of 15 Pa·s are required to obtain better functionality with a lower resistivity. However, using the proposed method, the fidelities of the printed patterns were achieved even with a high printing speed of 10.5 m/min using the high viscosity of 15 Pa·s, necessitating a subsequent sintering process. Therefore, the printed pattern was sintered in an oven at 350°C for 10 min. Patterned silver electrodes 1 m in length, 121 ± 2.2 μm in line width, 6.5 ± 2.2 μm in average thickness, and with a resultant resistivity of 9 µΩ·cm were achieved. The findings of this study confirm the potential of rotogravure printing for fabricating thick electrodes with high fidelity for flexible printed circuit boards with large areas. DOI : 10.1007/s11998-016-9844-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9844-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27792 [article]

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