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Process-dependent conductivity and film homogeneity of slot-die-coated PEDOT:PSS–PVA composite films / Anna-Lena Riegel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
[article]
Titre : Process-dependent conductivity and film homogeneity of slot-die-coated PEDOT:PSS–PVA composite films Type de document : texte imprimé Auteurs : Anna-Lena Riegel, Auteur ; Nora Reichelt, Auteur ; Philip Scharfer, Auteur ; Wilhelm Schabel, Auteur Année de publication : 2017 Article en page(s) : p. 1039-1051 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique
Composites
Conducteurs organiques
Conduction électrique
Couches minces
Enduction par filière
Poly(3,4-éthylènedioxythiophène)
Polystyrène sulfoneIndex. décimale : 667.9 Revêtements et enduits Résumé : In this study, we investigate the impact of process parameters on homogeneity and electrical conductivity of slot-die-coated PEDOT:PSS–PVA composite films that are doped with DMSO. Due to a strong correlation between conductivity and morphology of PEDOT:PSS films and the latter’s dependency on the processing step itself, we apply slot die coating for maximized process control and systematically evaluate the impact of coating gap, speed, and film thickness. Since the entire coating and drying process is run in batch mode, the setup is optimized regarding steady-state conditions and high homogeneity of the films. Overall, for the films manufactured in batch mode, we obtain a reproducibility film thickness of 99% and a low deviation from the set film thickness (below 8%). In order to analyze the impact of the coating parameters, stable operating points derived from the viscocapillary model are chosen and either the dimensionless gap or the capillary number is varied. Coating gap and film thickness emerged as dominating parameters, leading to an increase in conductivity of 40% and 70%, respectively, or, when changing both simultaneously, of 157%. Only a minor impact of shear forces (increase of 10%) was found. Note de contenu : - MATERIALS AND EXPERIMENTAL METHODS : Materials - Coating ink : composition and preparation - Coating and drying process - Experimental approach : coating window and operating points - Film analysis : conductivity and film thickness
- HOMOGENEITY OF COATINGS : IMPACT OF BATCH PROCESSING
- ELECTRIC CONDUCTIVITY OF COATINGS : INFLUENCE OF COATING PARAMETERS : Dependency of conductivity on dimensionless gap - Dependency of conductivity on capillary numberDOI : 10.1007/s11998-017-9981-Y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9981-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29139
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Code-barres Cote Support Localisation Section Disponibilité 19230 - Périodique Bibliothèque principale Documentaires Disponible A process model for slot coating of narrow stripes / Ara W. Parsekian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
[article]
Titre : A process model for slot coating of narrow stripes Type de document : texte imprimé Auteurs : Ara W. Parsekian, Auteur ; Tae-Joong Jeong, Auteur ; Tequila A. L. Harris, Auteur Année de publication : 2019 Article en page(s) : p. 1653-1661 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool polyvinylique
Enduction par filière
Formulation (Génie chimique)
Impression à motifs
Modèles mathématiques
Procédés de fabricationIndex. décimale : 667.9 Revêtements et enduits Résumé : Selective deposition of patterned films, without masks or subtractive postprocessing steps, can potentially be achieved by extending the capabilities of traditional slot coating. Realization of a fully additive-only approach of this nature will elevate the viability of slot coating for numerous emerging technologies such as flexible optoelectronic devices, sensors, and wearables. In this study, we develop a process model for slot coating of variable-width narrow stripes, as a fundamental and representative pattern feature for patterned slot coating. Our process model addresses the sensitivity of stripe output to fluid deposition rate, substrate speed, and coating gap for a given coating material. To explain the observed process behavior, we distinguish between separate configurations of contact line pinning of the liquid bridge at the coating tool surface and show experimentally how these configurations relate to regimes in the process model that must be characterized separately. We also demonstrate how the geometry of the liquid bridge and range of intermediate contact angles along its contact line correspond to observed hysteresis of the coated stripe width. Note de contenu : - MATERIALS AND METHODS : Materials - Experimental methods - Empirical modeling approach
- RESULTS AND DISCUSSION : Dimensional analysis - Empirical model formulation - Methodology and demonstrationDOI : 10.1007/s11998-019-00233-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00233-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33418
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Code-barres Cote Support Localisation Section Disponibilité 21321 - Périodique Bibliothèque principale Documentaires Disponible Shear orientation of nematic phases of clay nanosheets : processing of barrier coatings / Maximilian Röhrl in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)
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Titre : Shear orientation of nematic phases of clay nanosheets : processing of barrier coatings Type de document : texte imprimé Auteurs : Maximilian Röhrl, Auteur ; Judith H. Mettke, Auteur ; Sabine Rosenfeldt, Auteur ; Holger Schmalz, Auteur ; Ulrich Mansfeld, Auteur ; Renee L. Timmins, Auteur ; Christoph Habel, Auteur ; Josef Breu, Auteur ; Franz Durst, Auteur Année de publication : 2022 Article en page(s) : p. 487-495 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile
Caractérisation
Dispersions et suspensions
Enduction par filière
Matériaux -- Propriétés barrières
Matières plastiques -- Revêtement
Nanoparticules
Oxygène
Perméabilité
Polyéthylène téréphtalate
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : When suspensions are exposed to shear forces, the particles may form ordered structures depending on their shapes, concentrations, and the material. For some processes, e.g., for wet-film coating, it is important to know how fast these structures form in shear fields and for how long the structures persist when the shear is relaxed. To obtain information on the particle structure formation and the decay time, the effective viscosity of nematic suspensions of Na-hectorite nanosheets was investigated by rheology employing a cone-plate measurement geometry. The necessary time for the formation textured nematic films could be deduced by carrying out effective viscosity measurements at constant time steps. Information could also be obtained on the lifetime of the platelet textures when shear is relaxed. All this information was employed to identify geometrical requirements for slot dies to produce barrier liners with nanosheet layers oriented parallel to PET substrates. Thereby, we obtained green and simple coatings that are in line with state-of-the-art high-performance materials such as metalized plastic foils in terms of oxygen barrier properties. Note de contenu : - EXPERIMENTAL : Materials and sample preparation - Characterization methods - Coating experiments
- RESULTS AND DISCUSSION : Shear orientation of NaHec nanosheets - Slot die coating
- Table 1 : OTRs of slot die coated NaHec films (1.5 µm) measured at 23°C and different r.h.DOI : https://doi.org/10.1007/s11998-021-00535-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00535-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37280
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Code-barres Cote Support Localisation Section Disponibilité 23408 - Périodique Bibliothèque principale Documentaires Disponible A simulation model to approximate penetration of a non-newtonian fluid into a porous media during slot die coating / Xiaoyu Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
[article]
Titre : A simulation model to approximate penetration of a non-newtonian fluid into a porous media during slot die coating Type de document : texte imprimé Auteurs : Xiaoyu Ding, Auteur ; Thomas F. Fuller, Auteur ; Tequila A. L. Harris, Auteur Année de publication : 2014 Article en page(s) : p. 83-87 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière
Fluides non newtoniens
Matériaux poreux
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : A computational fluid dynamics (CFD) model has been developed to predict the penetration depth of a non-Newtonian fluid as it is directly coated onto porous media by a slot die coating process. The model couples 1-D modified Blake–Kozeny equations and Navier–Stokes equations. Experiments of coating a non-Newtonian solution (black strap molasses) onto carbon paper (Toray 090) are conducted and the penetration depths are measured to validate the model. Preliminary results show that predicted and measured penetration depths follow the same trend; that is, as the coating speed increases the penetration depth decreases. However, the simulated penetration depths are found to be one to two times higher than measured values at low coating speeds. Even so, the results are considered reasonable, due to imposed simplifications and approximations of the CFD model and errors associated with the experiments and measurements. DOI : 10.1007/s11998-013-9501-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9501-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20619
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible Simulation of slot-coating of nanocellulosic material subject to a wall-stress dependent slip-velocity at die-walls / P. A. Fuaad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
[article]
Titre : Simulation of slot-coating of nanocellulosic material subject to a wall-stress dependent slip-velocity at die-walls Type de document : texte imprimé Auteurs : P. A. Fuaad, Auteur ; Agne Swerin, Auteur ; Fredrik Lundell, Auteur ; Martti Toivakka, Auteur Année de publication : 2022 Article en page(s) : p. 111-120 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Enduction par filière
Formulation (Génie chimique)
Nanoparticules
Revêtements organiques
RhéologieTags : 'Enduction filière' 'Modèle Casson' 'Glissement non linéaire' Nanocellulose Index. décimale : 667.9 Revêtements et enduits Résumé : Bio-based nanocellulosic materials are non-toxic, renewable, exhibit excellent barrier properties, and are suitable candidates for sustainable food packaging applications. Sizing and designing coating parameters for slot-coating process using nanocellulose suspensions is challenging due to complex shear-thinning rheology and the presence of a water-rich boundary layer, effecting significant apparent slip at the wall. Previous studies have shown that the flow inside the coating bead can be complex, with occasional stagnation regions and a rheological model incorporating yield stress which should be considered while analyzing slot coating of nanocellulosic flows. This work extends earlier investigations by including the effects of the particle depleted water-rich boundary layer. The suspension is modeled as a Casson fluid with a shear-thinning viscosity, and the particle depletion at the wall is represented by an infinitely thin layer modeled as a local shear-dependent nonlinear slip law. The resulting two-phase flow equations are solved using a Finite Volume Method (FVM) coupled with the Volume of Fluid (VoF) method for tracking the free surface interface. It is observed that slip alters the flow’s dynamics in the coating bead, and the effect of slip cannot be ignored, especially at high shear rates. For thin films, the presence of slip enhances the flow, leading to more material coated on the substrate. In contrast, for thicker coatings, apparent slip leads to an augmentation in stagnant, non-yielded regions, potentially generating uneven surfaces. Note de contenu : - Mathematical formulation
- Numerical solution
- Table 1 Operating parametersDOI : https://doi.org/10.1007/s11998-021-00516-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00516-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37149
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Code-barres Cote Support Localisation Section Disponibilité 23313 - Périodique Bibliothèque principale Documentaires Disponible Slot die coating of lithium-ion battery electrodes : investigations on edge effect issues for stripe and pattern coatings / Marcel Schmitt in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
PermalinkSlot die stripe coating of low viscous fluids / Sebastian M. Raupp in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
PermalinkSteering and in situ monitoring of drying phenomena during film fabrication / Fabien Scheepers in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)
PermalinkTrailing edge formation during slot coating of rectangular patches / D. Maza in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
PermalinkTransient response of slot coating flows of shear-thinning fluids to periodic disturbances / Semi Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
PermalinkWetting behavior of the shear thinning power law fluids / Sima Didari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
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