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Liquid film coating of small molecule OLEDs / Katharina Peters in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
[article]
Titre : Liquid film coating of small molecule OLEDs Type de document : texte imprimé Auteurs : Katharina Peters, Auteur ; Lukas Wengeler, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2014 Article en page(s) : p. 75-81 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Démouillage (chimie des surfaces)
Diodes électroluminescentes
Enduction par filière
Lame d'enduction
Molécules
Revêtements
Tension superficielle
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : Organic small molecules typically deposited by vacuum deposition are a promising material for efficient, low-cost, area light-emitting diodes (OLEDs). In this article we discuss methods to apply these materials by solvent-based large area coating methods. As a basis for the technical description of the coating and wetting process, we present material properties, such as viscosity and surface tension of SMOLED solutions and polar and disperse part for the surface energy of typical substrates or semiconducting organic layers. Whereas SM content has little effect on the ink properties, impurities were identified as an important factor for the wetting behavior. Based on the material properties and coating experiments with SMOLED solutions, the coating methods of blade and slot die coating are discussed with respect to film thickness and stability. We found that the film thickness of knife-coated films does depend on velocity, temperature, provided fluid volume, and composition. Calibration curves for commercial materials (NMP and Spiro-MeOTAD) are given. The stability of slot die coating was lower than expected from literature. However, homogeneous SMOLED layers could be produced by slot die coating at gap-to-film-thickness ratios of up to 50. Note de contenu : - EXPERIMENTAL : Materials - Methods
- MATERIALS PROPERTIES
- LIQUID FILM COATING OF SMALL MOLECULE SINGLE LAYERS : Self-metering method : knife coating - Pre-metered method : slot die coatingDOI : 10.1007/s11998-013-9515-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9515-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20618
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 75-81[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible Numerical investigation of multiple-slot jets in air-knife wiping / A. Yahyaee Soufiani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
[article]
Titre : Numerical investigation of multiple-slot jets in air-knife wiping Type de document : texte imprimé Auteurs : A. Yahyaee Soufiani, Auteur ; J. R. McDermid, Auteur ; Andrew N. Hrymak, Auteur ; F. E. Goodwin, Auteur Année de publication : 2017 Article en page(s) : p. 1015-1025 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Enduction par filière
Galvanisation
Lame d'enduction
Matériaux -- Epaisseur
Métaux -- Revêtements protecteurs
Revêtement métallique
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : Gas-jet wiping using an air knife is an effective hydrodynamic method to control the coating thickness of zinc on a moving steel substrate in the continuous hot-dip galvanizing process. The current generation of single-slot air knives is widely used in the galvanizing industry but has limitations in producing low coating weights at the higher line speeds desired for the current generation of automotive sheet steel products. In this work, a novel configuration of a multiple-slot jet (multijet) air knife is investigated through numerical simulations as an alternative to the traditional single-slot air knife. The aim of this study is to investigate the sensitivity of the coating weight to the pressure and shear stress profiles in order to determine whether there are operating regions that are more robust to air-knife geometry changes. A modified geometry for the multislot air knife is proposed based on computational fluid dynamics results obtained from a parametric study. The effects of different operating conditions such as the main jet Reynolds number (Rem), auxiliary jet Reynolds number (Rea), and jet-to-wall distances (Z/D) on the final coating thickness were investigated. The results of the modeling showed that by setting the auxiliary jet Reynolds number at a fraction (25%) of the main jet Reynolds number, lighter coating weights can be achieved for higher strip velocities and higher wall-to-jet distances as compared to the single-slot jet design. It is believed that this geometry will provide a robust operating window to enable the prototype design to be employed in the industrial setting. Note de contenu : - Analytical model of film thickness
- Numerical modeling
- Boundary conditions and grid generation
- Validation
- Results and discussion : Effect of Da - Effect of auxiliary jet tilt angle (h) - Effect of a - Effect of s - Effect of jet-to-wall distance - Effect of main jet Reynolds number - Effect of auxiliary jet Reynolds number effectDOI : 10.1007/s11998-017-9963-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9963-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29137
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 5 (09/2017) . - p. 1015-1025[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19230 - Périodique Bibliothèque principale Documentaires Disponible