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Auteur Jaewook Nam |
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Ajouter le résultat dans votre panier Affiner la rechercheAnalysis 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)
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 resistanceDOI : 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24685
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 855-862[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17467 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Effect of shim configuration on flow dynamics and operability windows in stripe slot coating process Type de document : texte imprimé Auteurs : Gui Hua Han, Auteur ; Si Hyung Lee, Auteur ; Won-Gi Ahn, Auteur ; Jaewook Nam, Auteur ; Hyun Wook Jung, Auteur Année de publication : 2014 Article en page(s) : p. 19-29 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière
Revêtements
Simulation par ordinateurIndex. décimale : 667.9 Revêtements et enduits Résumé : The slot coating method is a strong candidate for the manufacture of secondary batteries and electrodes for electronics. For the production of such devices, one may need to coat multiple lanes simultaneously which is usually done by implementing specially designed stripe shim inside the die manifold. The effects of shim configurations on the stripe-patterned coated film were analyzed in this study. We employed computational and experimental analyses to estimate flow patterns and corresponding desirable operating condition changes for uniform, converging and diverging slit channels. It was found that the slit channel shape, which is determined by the shim design, can manipulate the die-exit velocity distribution, capable of controlling edge shape of the crossflow film thickness profile. However, other than producing a uniform channel, this might decrease the scope of operability windows due to the aggravation of bead break-up near the edge of the slit channel. Note de contenu : - SIMULATION AND EXPERIMENT : Three-dimensional computation for stripe coating flows - Experimental observations for coating flows and operability windows
- RESULTS AND DISCUSSION : Flow simulation within internal die region - Experiments for operability windows and coating profiles - Computational prediction of coating bead region combined with internal channelsDOI : 10.1007/s11998-013-9485-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9485-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20612
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 19-29[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Effect of sloped die lip geometry on the operability window in slot coating flows using viscocapillary and two-dimensional models Type de document : texte imprimé Auteurs : Si Hyung Lee, Auteur ; See Jo Kim, Auteur ; Jaewook Nam, Auteur ; Hyun Wook Jung, Auteur ; Jae Chun Hyun, Auteur Année de publication : 2014 Article en page(s) : p. 47-55 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière
RevêtementsTags : 'Buse à lèvres' 'Vortex en amont' aval' 'Fenêtre inclinée' 'Modèle de Navier-Stokes' Visco-capillaire' Revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : As an indicator for determining the operability window in slot coating flow, the viscocapillary model considering various configurations of upstream and downstream slot die lips was tested and compared with Navier–Stokes two-dimensional model. Bead pressure and sloped lip angle conditions for uniform coating operation demarcated from leaking and bead break-up defects were quantitatively predicted from the position of upstream meniscus from both models. By comparing the results, it is confirmed that the viscocapillary model for many kinds of sloped die lips could predict the operability window accurately. It is also found that there exists vortex or recirculation regimes inside upstream and downstream coating bead regions, depending on the angles of sloped die lips, even for the stable coating flow. The flow control by die lip structure will be usefully applied to design the strategy for the reliable and optimal coating process, including vortex-free windows. Note de contenu : - GOVERNING EQUATIONS FOR COATING BEAD FLOW : Viscocapillary model considering the sloped die configuration - Calculation of 2-D coating bead flow DOI : 10.1007/s11998-013-9504-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9504-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20615
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 47-55[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows Type de document : texte imprimé Auteurs : Won-Gi Ahn, Auteur ; Si Hyung Lee, Auteur ; Jaewook Nam ; See Jo Kim ; Kwan-Young Lee ; Hyun Wook Jung Année de publication : 2018 Article en page(s) : p. 1067-1076 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Enduction par filière
Fluides newtoniens
Mouillage (chimie des surfaces)
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : The coating bead flow and operability window for Newtonian coating liquids are theoretically and experimentally investigated in the slot coating process, with a focus on the shape of the upstream meniscus and contact angles. From the flow visualization in the coating bead region, the contact angles of the upstream meniscus were measured by changing the flow rate and web speed under uniform operating conditions. It was confirmed that the dynamic contact angle is closely related to the capillary number in this process, based on the Hoffman–Voinov–Tanner model. The viscocapillary and two-dimensional Navier–Stokes models using the experimentally observed contact angles accurately predicted the coating bead dynamics and operability windows for two Newtonian liquids. Note de contenu : - EXPERIMENTAL SETUP : Properties of coating liquids
- NUMERICAL SIMULATIONS FOR COATING BEAD FLOWS
- RESULTS AND DISCUSSION : Operability windows by models and experiments - Observation of upstream meniscus shape - Comparison of coating bead flows from experiments and 2-D simulations - Effect of contact angles at upstream meniscus on coating bead dynamics - Effect of contact angles at upstream meniscus on operability windowDOI : 10.1007/s11998-018-0059-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0059-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31133
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1067-1076[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Numerical analysis of pulsatile flows in a slot-die manifold Type de document : texte imprimé Auteurs : Heechan Jung, Auteur ; Jaewook Nam, Auteur Année de publication : 2019 Article en page(s) : p. 1141-1151 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse numérique
Eléments finis, Méthode des
Enduction par filière
Flux pulsatileIndex. décimale : 667.9 Revêtements et enduits Résumé : We analyze the effects of inlet periodic pulsatile flows on the flow inside a slot-die manifold for different locations of the inlet feed port. This type of flow rate disturbance can be caused by a coating liquid pumping mechanism that may lead to coating thickness nonuniformity. In this study, we analyze the transient behavior of the three-dimensional flows inside the slot-die manifold using parallel finite element computations. For a small magnitude of inlet flow rate disturbance with a given frequency, the local flow rate per unit width and the velocity profile at the feed slot exit become periodic. Therefore, the amplification factor can be used to quantify the effect of the inlet pulsatile flows. We found that the flow inside the feed slot, which is the confined channel with a high aspect ratio, dominates the dynamics of the outlet flow. However, the overall trend of the amplification factor along the cross-web direction resembles the steady-state pressure profile inside the cavity, and hence the steady-state profile of the outlet flow rate per unit width, which is strongly affected by the choice of the inlet port location. Note de contenu : - DEFINITIONS AND FORMULATIONS OF THE PROBLEM : Numerical methods - Frequency response analysis
- RESULTS : Steady-state computations - Transient computations
- FINAL REMARKS
- APPENDIX : The stabilized space-time Galerkin finite element formulationDOI : 10.1007/s11998-019-00190-w En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00190-w.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32869
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 4 (07/2019) . - p. 1141-1151[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21127 - Périodique Bibliothèque principale Documentaires Disponible
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