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Evaluating sag resistance with a multinotched applicator : correlation with surface flow measurements and practical recommendations / Robert K. Lade 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. 809-817 Titre : Evaluating sag resistance with a multinotched applicator : correlation with surface flow measurements and practical recommendations Type de document : texte imprimé Auteurs : Robert K. Lade, Auteur ; Austin D. Musliner, Auteur ; Christopher W. Macosko, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2015 Article en page(s) : p. 809-817 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Ecoulement bidimensionnel Essais (technologie) Latex Racle Résistance à l'écoulement Revêtements:Peinture Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Sag is a coating defect that results from excessive, gravity-driven flow after deposition. Accordingly, characterizing resistance to sag is critically important. In this paper, sag resistance predicted using a multinotched applicator test is compared with results obtained using an in situ particle tracking technique that measures surface velocity. Four commercial latex paints dried on substrates inclined at three angles were investigated. The results are used to provide insight into the strengths and limitations of using a multinotched applicator to evaluate sag resistance. For coatings dried on vertical surfaces (90°), the suggested condition for the multinotched applicator, sag lengths found by particle tracking show differences between paints that the multinotched applicator ranked as identical. At smaller angles (e.g., 10°), the resolution of the multinotched applicator test is greatly enhanced owing to a reduction in the shear stress difference between adjacent coated lines. Based on these results, specific recommendations are made for successfully employing a multinotched applicator to evaluate sag resistance based on user-specific goals. Note de contenu : - Materials - Anti-Sag Meter testing - Rheological characterization of latex paints - Sag length, initial wet film thickness, and evaporation rate measurements DOI : 10.1007/s11998-015-9680-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9680-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24679 [article]

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Simultaneous multilayer coating of water-based and alcohol-based solutions / R. Horiuchi 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. 819-826 Titre : Simultaneous multilayer coating of water-based and alcohol-based solutions Type de document : texte imprimé Auteurs : R. Horiuchi, Auteur ; W. J. Suszynski, Auteur ; M. S. Carvalho, Auteur Année de publication : 2015 Article en page(s) : p. 819-826 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces multicouches Démouillage (chimie des surfaces) Revêtements multicouches Solutions (chimie) Solutions aqueuses (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : Multilayer continuous liquid coating is the most efficient way to manufacture films that require more than one layer for optimal performance. Two-layer slot coating is one of the different coating methods largely used to deposit two thin, uniform liquid layers onto a moving substrate. In recent years, the operating conditions and solution properties which are required to avoid various coating defects have been discussed in the literature. However, these past studies have not focused on the problem of top layer dewetting, which may occur at some operating conditions. It is important to include in the operating window of the process, the region of the parameter space at which the top layer dewetting is avoided. In this work, we used water-based and alcohol-based solutions to create two-layer films over a moving substrate using a two-layer slot coating die. The critical operating condition at which top layer dewetting is observed is determined experimentally for different liquid viscosities, surface tensions, and wet thicknesses. A physical mechanism that explains the reported phenomenon is proposed. The results show how dewetting can be avoided by controlling the liquid properties (surface tension and viscosity) and wet thickness of each layer and will certainly help the design of two-layer slot coating processes. Note de contenu : - Results : Two layer slot coating - Effect of coating flow on top layer dewetting DOI : 10.1007/s11998-015-9689-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9689-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24680 [article]

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Direct thickness measurement of doctor-bladed liquid film on gravure roll surface / Hidenobu Miura 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. 827-833 Titre : Direct thickness measurement of doctor-bladed liquid film on gravure roll surface Type de document : texte imprimé Auteurs : Hidenobu Miura, Auteur ; Masato Yamamura, Auteur Année de publication : 2015 Article en page(s) : p. 827-833 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction Epaisseur -- Mesure Films plastiques Héliogravure Polyéthylène glycol Polyéthylène téréphtalate Index. décimale : 667.9 Revêtements et enduits Résumé : We provide experimental evidence that the liquid film remaining on a doctor-bladed gravure roll surface significantly influences the liquid transfer from the engraved roll surface to a moving substrate. The local free surface profiles of doctor-bladed liquid films were directly measured on both tri-helical grooves and lands (the nongrooved areas between grooves) at different roll speeds and blade thicknesses. The liquid film covered the roll surface with a finite thickness on the lands below the critical capillary number. An increase in the capillary number led to a transition from a fully filled to a starved configuration, in which the liquid barely remained on the lands and partly filled the grooves with a concave surface profile. The liquid transfer ratio monotonically decreased with a decrease in the liquid thickness on the gravure roll surface, obeying a single curve for different blade thicknesses. Furthermore, the decrease in liquid thickness promoted a flow instability transition from unstable dripping though a stable state with a uniform surface to a cascade. DOI : 10.1007/s11998-015-9714-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9714-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24681 [article]

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Processing of CdTe thin films by intense pulsed light in the presence of CdCl2 / R. Dharmadasa 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. 835-842 Titre : Processing of CdTe thin films by intense pulsed light in the presence of CdCl2 Type de document : texte imprimé Auteurs : R. Dharmadasa, Auteur ; Brandon W. Lavery, Auteur ; I. M. Dharmadasa, Auteur ; Thad Druffel, Auteur Année de publication : 2015 Article en page(s) : p. 835-842 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Dépôt électrolytique Dépôt par lumière pulsée Tellurure de cadmium Traitement thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Intense pulsed light (IPL) treatment was used for rapid thermal processing of electroplated CdTe layers, with and without CdCl2. Electroplated CdTe layers consist of small grains showing highly preferential orientation along the (111) planes. IPL processing improves the crystallinity keeping the (111) preferred orientation until an energy input threshold is reached. IPL treatment beyond this point shows a sudden structural transition within the layer with a decrease in each of the orientations. The addition of a CdCl2 treatment prior to the IPL initiates a transition from the preferred (111) orientation to randomly oriented grains throughout the film. X-ray diffraction, scanning electron microscopy, and optical microscopy were used to study the structural and morphological changes of these films. Note de contenu : - IPL and the number of pulses (without CdCl2) - IPL treatment with CdCl2 DOI : 10.1007/s11998-015-9688-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9688-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24682 [article]

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Numerical simulation of the dip-coating process with wall effects on the coating film thickness / Mahyar Javidi 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. 843-853 Titre : Numerical simulation of the dip-coating process with wall effects on the coating film thickness Type de document : texte imprimé Auteurs : Mahyar Javidi, Auteur ; Andrew N. Hrymak, Auteur Année de publication : 2015 Article en page(s) : p. 843-853 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Dip-coating Fluide de Carreau Le fluide de carreau est un type de fluide newtonien généralisé où la viscosité, dépend du taux de cisaillement. Simulation par ordinateur Index. décimale : 667.9 Revêtements et enduits Résumé : The dip-coating process for liquid film deposition on cylindrical substrates is numerically simulated, and the effects of the coating bath walls proximity to the substrate are investigated for the deposited film thickness. In the present work, the hydrodynamics of non-Newtonian liquid films are studied, applying Carreau and power law models. The free surface position is determined by the volume of fluid technique in a three-dimensional system, while the impacts of density, viscosity, and surface tension are taken into account. The momentum and mass balance, alongside the constitutive equations, were solved for dip-coating process using numerical simulations in an open source CFD software package of OpenFOAM. Numerical outcomes are validated with experimental data over a large range of withdrawal velocities up to 6 m/s. Also good agreement is obtained for numerical simulation results with experimental data for coating thickness, considering the proximity effects of bath walls to the cylindrical substrate being withdrawn from a coating bath. Note de contenu : - THEORETICAL PROCEDURE : Mathematical formulation - Free surface implementation - Constitutive equations - NUMERICAL PROCEDURE : Grid generation - Boundary conditions - RESULTS AND DISCUSSION : Validation of simulation results with previous experimental data - Wall effects DOI : 10.1007/s11998-015-9699-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9699-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24683 [article]

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Analysis of transparent conductive silver nanowire films from dip coating flow / Kwangguk Ahn 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. 855-862 Titre : Analysis of transparent conductive silver nanowire films from dip coating flow Type de document : texte imprimé Auteurs : Kwangguk Ahn, Auteur ; Dongjae Kim, Auteur ; Onyu Kim, Auteur ; Jaewook Nam, Auteur Année de publication : 2015 Article en page(s) : p. 855-862 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse d'image L'analyse d'image est la reconnaissance des éléments contenus dans l'image. Il ne faut pas confondre analyse (décomposition en éléments) et traitement (action sur les composantes) de l'image. Argent Conduction électrique Dip-coating Matériaux -- Propriétés optoélectroniques Nanoparticules Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : Silver nanowires are a promising nanomaterial for the fabrication of transparent flexible conductive films. Due to their fascinating properties, numerous studies have been done to determine the relationship among nanowire properties, micro-network structure, and opto-electronic properties, such as transparency and conductivity.1,2 However, most previous studies have used methods that are not suitable for mass production, such as vacuum filtration. To produce the film economically, it is advisable to use a solution process, e.g., a liquid coating method. In this study, we use a simple dip coating method to produce the film using a coating solution, which disperses nanowires in isopropyl alcohol. The amount of nanowires on the film is carefully controlled by the wet film thickness predicted from computational analysis. The important parameters of nanowire networks, such as the diameter, the aspect ratio, and the areal coverage of nanowires are measured directly from image analysis of the electron microscopy images. Finally, the relationship among those parameters and opto-electronic properties is examined in detail. Note de contenu : - EXPERIMENTAL AND NUMERICAL METHODS : Experimental setup and procedure - Prediction of coating thickness and number of nanowires - Image analysis to extract individual nanowires - RESULTS AND DISCUSSION : Thickness prediction for confined dip coating flow - Length and diameter analyses - Estimated and measured area fractions - transparency and sheet resistance DOI : 10.1007/s11998-015-9690-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9690-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24685 [article]

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Free-surface profile of evaporative liquids at the vicinity of the contact line / S. Houssainy 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. 863-867 Titre : Free-surface profile of evaporative liquids at the vicinity of the contact line Type de document : texte imprimé Auteurs : S. Houssainy, Auteur ; H. P. Kavehpour, Auteur Année de publication : 2015 Article en page(s) : p. 863-867 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Evaporation Interfaces (Sciences physiques) Ligne de contact (chimie physique) (Chimie physique) Ligne correspondant à l’intersection apparente de deux interfaces contigües. Mouillage (chimie des surfaces) Surfaces -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : Interfacial phenomenon, specifically those associated with evaporation from thin liquid films near the contact line of a liquid drop, plays a major role in many current engineering applications which require high local heat fluxes, as evident in heat pipes, grooved evaporators, fuel cells, and suction nucleate boiling devices (Potash and Wayner in Int J Heat Mass Transf 15:1851–1863, 1971; Hanchak et al. in Int J Heat Mass Transf 75:196–206, 2014). This study will prove useful in the improvement of such applications. Fluorescence microscopy was used as our main technique for investigating the free-surface profiles of evaporative liquids at the vicinity of the contact line, as it delivers sufficient range and resolution to address the challenge of capturing the microscopic and macroscopic aspects of this phenomenon. The free-surface profiles of relatively low evaporative liquids were compared with those of nonevaporative liquids, specifically one centistoke silicon oil was compared with one hundred centistokes silicon oil and qualitatively no difference has been observed between both profiles near the contact line. DOI : 10.1007/s11998-015-9716-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9716-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24686 [article]

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Freezing of supercooled water drops on cold solid substrates : initiation and mechanism / Faryar Tavakoli 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. 869-875 Titre : Freezing of supercooled water drops on cold solid substrates : initiation and mechanism Type de document : texte imprimé Auteurs : Faryar Tavakoli, Auteur ; Stephen H. Davis, Auteur ; H. Pirouz Kavehpour, Auteur Année de publication : 2015 Article en page(s) : p. 869-875 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Condensation Congélation Hydrophobie Imagerie (technique) Mouillage (chimie des surfaces) Nucléation Recalescence La Recalescence est une augmentation de température qui se produit pendant le refroidissement métallique quand un changement de structure à une augmentation de l'entropie se produit. La chaleur responsable de la variation de la température est due à la variation de l'entropie. Quand une transformation de la structure se produit l'énergie libre de Gibbs de deux structures sont plus ou moins les mêmes. Par conséquent, le processus sera exothermique. La chaleur fournie est la chaleur latente. La recalescence se produit également après la surfusion, lorsque le liquide en surfusion coup cristallise, formant un solide, mais la chaleur de libération dans le processus. Revêtements Solidification Surfusion Index. décimale : 667.9 Revêtements et enduits Résumé : Drops of liquid are placed on substrates having temperatures below the melting point of the liquids (supercooling). All well-known stages of cooling and freezing (supercooling–recalescence–main solidification–ice cooling) of water drops on both hydrophilic and hydrophobic surfaces were observed using a k-type thermocouple and an IR camera. Duration of the main solidification and the ice cooling stages were found to be dependent on the drop size. However, no conclusive relationship can be made regarding the duration of the supercooling stage with the drop size and the surface hydrophobicity. Using an IR camera, we observed that the solidification initiation of the main drop, which corresponds to the supercooling stage duration, is triggered by the erratic wave-like recalescence front of the surrounding condensed microdrops. The nucleation always initiates from the trijunction and propagates into the drop volume with different structural morphologies determined by temperatures and surface hydrophobicity of the substrate. The recalescence front speed of the main drop varies from 50 to 150 mm/s with supercooling temperatures. DOI : 10.1007/s11998-015-9693-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9693-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24687 [article]

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Analytical determination of process windows for bilayer slot die coating / Marcel Schmitt 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. 877-887 Titre : Analytical determination of process windows for bilayer slot die coating Type de document : texte imprimé Auteurs : Marcel Schmitt, Auteur ; Sebastian Raupp, Auteur ; Dennis Wagner, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2015 Article en page(s) : p. 877-887 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accumulateurs lithium-ion Enduction par filière Fluides non newtoniens Revêtements multicouches Index. décimale : 667.9 Revêtements et enduits Résumé : Slot die coating is a film casting process with a highly diverse variety of everyday applications. As a pre-metered process it not only guarantees excellent film uniformity, but is also suitable for simultaneously applied multilayer coatings. Characteristic singularities like the behavior of the liquid–liquid interface and the impact of the additional mid-lip on film uniformity were already investigated before. However, the effect of an altered gap pressure regime on commonly used coating windows has not yet been discussed. In this work, we therefore extended available single-layer coating windows for Newtonian and power-law liquids to the bilayer case. Here, the emphasis was laid on the air entrainment limit. Subsequently, the theoretical results were compared to experimental data. It was found that the onset of air entrainment strongly depends on the top to bottom film thickness ratio for bilayer coatings. A critical film thickness ratio which delivers similar coating limits as those for single-layer coatings was derived and confirmed by experimentally gained results. Note de contenu : - Calculation of the single-layer coating bead pressure - Calculation of the bilayer coating bead pressure DOI : 10.1007/s11998-015-9701-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9701-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24688 [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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Forces generated by web peeling for printing and coating applications / Harrison Gates 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. 899-913 Titre : Forces generated by web peeling for printing and coating applications Type de document : texte imprimé Auteurs : Harrison Gates, Auteur ; Douglas W. Bousfield, Auteur Année de publication : 2015 Article en page(s) : p. 899-913 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Pelage Revêtements Tags : 'Tensioned  web'  Peeling  Coating  Printing  'z-Directional  forces' Index. décimale : 667.9 Revêtements et enduits Résumé : The tensile forces that act on a web in printing and coating applications are important in situations where the web may delaminate or break. A model is proposed that uses lubrication expressions to describe the fluid flow in the thin fluid layer combined with a force balance on the web to describe the peeling event. A novel experimental method is described that measures the forces to separate a tensioned web from a surface with a viscous fluid between them. Forces are measured for various parameters such as viscosity, web tension, separation velocity, fluid volume, and fluid geometry. Dimensionless expressions are developed to correlate experimental results. Web deformation and forces are found to be influenced by a thin air film between web and bottom plate. These initial forces are found to be larger than later peeling forces unless something is done to allow air to flow between the web and the lower plate. Low web tension and stiffness are found to reduce the maximum force. The model predicts the measured forces within the expected accuracies. However, the model overpredicts the forces for large patch areas and thin films; this is likely caused by a cavitation mechanism or be three-dimensional flows for these large patch areas. Simplified expressions are generated to correlate the peeling forces for a wide range of experimental parameters. Note de contenu : - Model development - Numerical methods - Model predictons DOI : 10.1007/s11998-015-9731-y 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=24690 [article]

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Local heat transfer characteristics of a slot nozzle array for batch drying of thin films under industrial process conditions / Michael Baunach 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. 915-920 Titre : Local heat transfer characteristics of a slot nozzle array for batch drying of thin films under industrial process conditions Type de document : texte imprimé Auteurs : Michael Baunach, Auteur ; Stefan Jaiser, Auteur ; Philip Cavadini, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2015 Article en page(s) : p. 915-920 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Revêtements Séchage Thermocinétique Transfert de masse Index. décimale : 667.9 Revêtements et enduits Résumé : For optimizing the drying process of thin functional films, knowledge of the relevant influencing parameters is needed. One paramount parameter for design of experimental conditions and the accurate interpretation of experimental data is the heat transfer coefficient inside a dryer. Information on the heat transfer in a dryer also facilitates a reliable transfer of results obtained in laboratory set-ups to industrial production. In this work, the heat transfer in a batch drying set-up with an array of slot nozzles is investigated. The measurement arrangement consists of a heat flux sensor mounted on the surface of a temperature-controlled plate. For validation of this arrangement, heat transfer measurements with a single round nozzle were compared to transient heat transfer data measured in the batch drying set-up show a periodically homogenous distribution of heat transfer coefficients for the investigated 16 nozzles. This gives the possibility to dry thin films with a coating length of up to 800 mm in the set-up at constant conditions along the coating length. A prerequisite is a periodical movement with an amplitude of at least one nozzle-to-nozzle spacing. DOI : 10.1007/s11998-015-9712-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9712-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24692 [article]

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Investigation of the flow field in thin polymer films due to inhomogeneous drying / Philip Cavadini 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. 927-926 Titre : Investigation of the flow field in thin polymer films due to inhomogeneous drying Type de document : texte imprimé Auteurs : Philip Cavadini, Auteur ; Erz Joachim, Auteur ; Dirk Sachsenheimer, Auteur ; Anne Kowalczyk, Auteur ; Norbert Willenbacher, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2015 Article en page(s) : p. 927-926 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces -- Défauts Déformations (mécanique) Fluorescence Mesure -- Instruments Particules (matières) Polyacétate de vinyle Index. décimale : 667.9 Revêtements et enduits Résumé : In the field of organic and printed electronics (e.g., polymer solar cells, OLEDs, or Li-ion batteries), there is a growing demand for thin functional layers with highly homogeneous surface topology. If these layers are coated from the liquid phase, the coating and drying steps affect the surface quality. As a result of inhomogeneous drying rates, the solvent concentration can vary along the top surface and the thickness of a solidifying solution, leading to local differences in surface tension. In turn, Marangoni convection, as the balancing mechanism, can occur and cause surface inhomogeneity. The in situ reconstruction of the free surface during drying has been presented elsewhere. During this investigation phenomena occurred that could not be completely understood without knowledge of the respective flow field. In the present work, the visualization of the flow field in thin polymer films [methanol-poly(vinyl acetate) solution with 67 wt% methanol] due to inhomogeneous drying is presented. To resolve the flow field, we apply fluorescent particle tracking (µPTV). Since both measurement techniques cannot easily be applied at the same time, the boundary conditions were adapted to the way of observation of each experimental setup. In the case of the setup for surface reconstruction of the free surface, locally different evaporation rates were realized by drying on a structured substrate (varying material). To force similar variation of the drying conditions in the case of the µPTV setup, the drying film was partially covered. As expected, both boundary conditions result in a propagating wave front towards regions of high surface tension. Combining both experimental setups, we were able to visualize the free surface and the flow structures up- and downstream of the wave front and found different flow regimes. DOI : 10.1007/s11998-015-9725-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9725-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24693 [article]

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An experimental and analytical study on intermittent slot die coating of viscoelastic battery slurries / Marcel Schmitt 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. 927-938 Titre : An experimental and analytical study on intermittent slot die coating of viscoelastic battery slurries Type de document : texte imprimé Auteurs : Marcel Schmitt, Auteur ; Ralf Diehm, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2015 Article en page(s) : p. 927-938 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Accumulateurs lithium-ion Enduction par filière Fluides non newtoniens Revêtements:Peinture Viscoélasticité Index. décimale : 667.9 Revêtements et enduits Résumé : Large-scale secondary lithium-ion batteries could be a key technology to compensate for the inconsistent energy supply of renewable sources. However, their manufacture is still very costly. In particular, the intermittent slot die coating of the battery electrodes is the speed-limiting and thus cost-driving process. In this field, various patents have been granted, and most in-house coating equipment was developed in industry. These technologies are often optimized empirically, since intermittent slot die coating is not mentioned in the scientific literature. In this work, we investigate the dominating and limiting mechanisms for intermittent slot die coating of non-Newtonian battery slurries. To characterize the process, we measured the system and die pressure and the associated wet film thickness. To build a common basis for all established technologies, we reduced the coating system to a syringe pump, a bypass valve, and a slot die. Our results show the direct link between casted film and pressure distribution within the coating. To reduce leveling times between the coating and interruption phases of an intermittent coating, a model was developed to predict the optimum pressure levels. It was found that different pressure levels during the coating and interruption phases lead to film break-ups or downstream die swelling, and thus limit the whole process. DOI : 10.1007/s11998-015-9717-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9717-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24694 [article]

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Effect of shear strain in coating on the particle packing of gelled-clay particle dispersions during drying / Yoshiyuki Komoda 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. 939-948 Titre : Effect of shear strain in coating on the particle packing of gelled-clay particle dispersions during drying Type de document : texte imprimé Auteurs : Yoshiyuki Komoda, Auteur ; Shigeyuki Kobayashi, Auteur ; Hiroshi Suzuki, Auteur ; Ruri Hidema, Auteur Année de publication : 2015 Article en page(s) : p. 939-948 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agrégats (chimie) Argile Cisaillement (mécanique) Dispersions et suspensions Particules (matières) Revêtements Rugosité Séchage Index. décimale : 667.9 Revêtements et enduits Résumé : Particle aggregates formed in a dispersing medium may be destroyed depending on the shear history applied in the coating process. Yielding behavior of gelled-clay particle dispersion can be interpreted as the destruction of particle network structure with the increase in shear strain. In the present study, gelled-clay particle dispersion was coated at different shear strain to control the initial status of particle aggregation of the drying process. The packing behavior of clay particles in the coated film was investigated from the viewpoint of void fraction in the film by the simultaneous measurements of weight loss and thickness decrease. Additionally, the change of surface roughness was researched based on the scattering pattern analysis. As a result, it was found that dispersed particles started to be packed tightly in the constant drying rate period, and that void fraction and surface structure of particle-packed layer scarcely changed in the latter part of the falling drying rate period. In contrast, if clay particle aggregates remained at the beginning of drying, a loosely packed particle layer was formed without changing surface structure in the constant drying rate period. However, the surface roughness was increased continuously in the falling drying rate period in spite of keeping constant film thickness, probably because void in the particle layer was collapsed. Note de contenu : - Determination of shear strain necessary for structure destruction - Effect of activtor concentration on drying rate - Thickness decrease and weight loss - Scattering pattern analysis DOI : 10.1007/s11998-015-9719-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9719-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24695 [article]

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Response of slot coating flow to gap disturbances : effects of fluid properties, operating conditions, and die configurations / Semi Lee 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. 949-958 Titre : Response of slot coating flow to gap disturbances : effects of fluid properties, operating conditions, and die configurations Type de document : texte imprimé Auteurs : Semi Lee, Auteur ; Jaewook Nam, Auteur Année de publication : 2015 Article en page(s) : p. 949-958 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Slot  coating'  'Frequency  response'  'Finite  element  method'  Uniformity  'Gap  disturbance' Index. décimale : 667.9 Revêtements et enduits Résumé : Slot coating is perhaps one of the most successful film manufacturing methods and is used to produce a wide variety of products. It is a pre-metered method and ideal for high-precision coating: the steady-state thickness is precisely controlled by the flow rate fed to the die and the web speed. However, the coating method is surrounded by small-scale disturbances that can destroy film thickness uniformity. Among various disturbances, a periodic change of the coating gap, the so-called gap disturbance, is considered the most dangerous in previous studies, e.g., Romero and Carvalho (Chem Eng Sci 63(8):2161–2173, 2008), Tsuda et al. (AIChE J 56(9):2268–2279, 2010), and Lee and Nam (AIChE J, 2015). However, the effects of fluid properties, operating conditions, and die configurations on the slot coating flow under gap disturbances are not examined in detail. In this study, we revisit the computer-aided analysis of transient slot coating flow designed to predict the thickness variations under gap disturbance. Extensive computational predictions reveal important parameters for suppressing film nonuniformity that can be induced by gap disturbance. Note de contenu : - GOVERNING EQUATIONS AND BOUNDARY CONDITIONS - SOLUTION METHODS - RESULTS AND DISCUSSION : Effects of fluid properties - Effects of operating conditions - Effect of die configurations DOI : 10.1007/s11998-015-9684-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9684-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24697 [article]

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Dynamic of spreading on ultra-hydrophobic surfaces / A. Mohammad Karim 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. 959-964 Titre : Dynamic of spreading on ultra-hydrophobic surfaces Type de document : texte imprimé Auteurs : A. Mohammad Karim, Auteur ; H. P. Kavehpour, Auteur Année de publication : 2015 Article en page(s) : p. 959-964 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Cinétique chimique Hydrodynamique Hydrophobie Mouillage (chimie des surfaces) Polyéthylène glycol Polytétrafluoréthylène Verre Index. décimale : 667.9 Revêtements et enduits Résumé : Despite the extensive variety of applications for ultra-hydrophobic surfaces in industry, technology, and biology, due to their wetting characteristics, there has not been considerable attention in the area of dynamics of wetting on ultra-hydrophobic surfaces. In this research, the experimental investigations have been done by applying forced spreading of several polyethylene-glycol/water mixtures in different weight ratios on Teflon plates and ultra-hydrophobic sprayed glass substrates. Hydrodynamics theory and molecular-kinetic theory have been applied to investigate the dynamics of wetting on these substrates. It has been found that the dynamics of receding motion of liquid contact line on ultra-hydrophobic surfaces could be described perfectly with the molecular-kinetic theory. In the case of advancing motion on an ultra-hydrophobic surface, dynamic contact angle is independent of liquid contact line velocity. The advancing and receding motions of liquid contact line on smooth Teflon plates followed molecular-kinetic theory. DOI : 10.1007/s11998-015-9686-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9686-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24702 [article]

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