Liquid film stability and contact line dynamics of emulsion liquid films in curtain coating process / A. Mohammad Karim in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 6 (11/2021) . - p. 1531-1541 Titre : Liquid film stability and contact line dynamics of emulsion liquid films in curtain coating process Type de document : texte imprimé Auteurs : A. Mohammad Karim, Auteur ; Wieslaw J. Suszynski, Auteur ; Saswati Pujari, Auteur Année de publication : 2021 Article en page(s) : p. 1531-1541 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Liquides polyphasiques Revêtement au rideau Le revêtement au rideau, également connu sous le nom de revêtement conforme ou de contour, est un processus industriel dans lequel un rideau de fluide lisse tombe comme une cascade sur la surface à revêtir. L’objet à revêtir est transporté sur une bande transporteuse et se déplace à une vitesse prédéterminée et contrôlée. Il traverse le rideau tombant de fluide où il acquiert un revêtement uniforme, dont l’épaisseur est déterminée par la quantité et la viscosité du fluide qui quitte le réservoir et la vitesse de la bande transporteuse. Tout excès de liquide est collecté dans une auge et est renvoyé dans le réservoir de coulée. Le liquide tombe dans un tamis mince sur l’objet à travers une fente réglable étroite dans la base du réservoir de coulée, et la surface supérieure de l’objet qui passe à travers le tamis est recouverte uniformément de fluide. Revêtements en phase aqueuse:Peinture en phase aqueuse Tags : 'Stabilité  du  film  liquide'  'Amincissement  par  cisaillement'  'Liquide  multiphase'  'Ligne  de  contact Index. décimale : 667.9 Revêtements et enduits Résumé : Previous studies reported that single-phase liquid curtains become more stable with increasing Ohnesorge number. Many liquid films used in the coating industry are types of emulsion samples. Despite this fact, the effect of multiphase liquids on the dynamics of the curtain breakup has not yet been considered. This study explores the stability of emulsion curtain coating via high-speed visualization. The critical condition at the onset of curtain breakup was determined by finding the flow rate below which the curtain broke. Curtain breakup was observed via a hole initiation within the curtain. The results reveal that curtain breakup dynamics is governed by the characteristic dynamic viscosity and the surface tension. The emulsion curtain stability, defined by Weber number, increases as Ohnesorge number rises, similar to the single-phase liquid (i.e., Newtonian and pure shear thinning) curtain stability. The critical web speed at which the contact line moves upstream of the curtain, a phenomenon called heel formation, and that at which air entrainment occurs, were determined for emulsion solutions at different flow rates. The results reveal that the surface tension increase delays the onset of air entrainment which could help to conduct faster curtain coating substrates with emulsion liquid films. Note de contenu : - MATERIALS AND METHODS : Experimental setup - Materials - RESULTS AND DISCUSSION : Liquid velocity in the curtain - Visualization of the liquid curtain breakup - Growth dynamics of hole within the emulsion liquid film - Liquid curtain stability - Stability of the dynamic contact line - Table : The physical properties of emulsion solutions DOI : https://doi.org/10.1007/s11998-021-00520-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00520-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36806 [article]

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A Raman spectroscopic method to find binder distribution in electrodes during drying / Hideki Hagiwara in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 11-17 Titre : A Raman spectroscopic method to find binder distribution in electrodes during drying Type de document : texte imprimé Auteurs : Hideki Hagiwara, Auteur ; Wieslaw J. Suszynski, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2014 Article en page(s) : p. 11-17 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Electrodes Liants Réticulation (polymérisation) Revêtements Spectroscopie Raman Index. décimale : 667.9 Revêtements et enduits Résumé : Lithium ion batteries are used extensively in electronic devices as well as hybrid and electric vehicles. The anode electrode layer in the battery can be fabricated by coating an aqueous dispersion of carbon, binder, and additives, and then drying. During manufacturing, the distribution of the binder through the coating thickness can become nonuniform, which compromises the properties and performance of the battery. In this study, a quantitative method to analyze the binder distribution in the electrode during drying was established. A drying apparatus with an integrated analytic balance and surface-temperature measurement was used to prepare specimens. At specific time points during drying, specimens were removed from the apparatus, quickly frozen, and then freeze-dried. Raman spectroscopy was then used to measure the binder concentration at different points through the cross section of the freeze-dried electrode coating. Scanning electron microscopy was also used to explore the changing microstructure qualitatively. Using a model electrode formulation, the method demonstrated different binder distributions for electrodes dried at 150°C under airflow and room temperature, 20°C, with no airflow. The results also showed continued changes in distribution in the interior of the coating as drying continued. Note de contenu : - EXPERIMENTAL METHODS : Materials - Dispersion preparation and coating - Specimen preparation - Characterization - Supporting experiments - RESULTS AND DISCUSSION : Raman spectra and calibration curve - Binder distribution during drying DOI : 10.1007/s11998-013-9509-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9509-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20611 [article]

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Water-based coatings for 3D printed parts / Jiayi Zhu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 889-897 Titre : Water-based coatings for 3D printed parts Type de document : texte imprimé Auteurs : Jiayi Zhu, Auteur ; Julia L. Chen, Auteur ; Robert K. Lade, Auteur ; Wieslaw J. Suszynski, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2015 Article en page(s) : p. 889-897 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dip-coating Impression tridimensionnelle Revêtements en phase aqueuse Rhéologie Surfaces (technologie) Surfaces -- Analyse Viscosimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Three-dimensional (3D) printing or additive manufacturing is an emerging technology that enables the exploration of new ideas and designs. The process converts a 3D digital model into a 3D object, allowing end users to hold and easily visualize their designs. Since 3D printed parts are built through layer-by-layer deposition, they exhibit limited surface smoothness and surface quality. By applying water-based coatings onto 3D printed parts, surface quality can be improved by reducing surface roughness and by sealing surface gaps without deforming the parts themselves. In this study, water-based coatings were applied to 3D printed parts using a computer-controlled dip coater. Surface profiles of 3D printed parts before and after dip coating were measured using a profilometer and parts were examined with optical microscopy. Two commercial water-based coating systems were evaluated, and the effect of coating speed, drying conditions, and number of coated layers on surface roughness of 3D printed parts was studied. The effect of printing with different print tips and in different orientations on surface roughness before and after coating was also studied. Coating liquids with higher solids loading were found to be most effective at smoothing or planarizing the 3D printed part surface. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Coating preparation - viscosity measurements - Surface characterization - RESULTS AND DISCUSSION : Rheology of the coating solutions - Surface morphology of 3D printed parts before coating - Surface morphology of 3D printed parts after coating DOI : 10.1007/s11998-015-9710-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9731-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24689 [article]

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