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Avoiding surface instability and slurry jamming in simultaneous multilayer coating of structured particulate films / J. Alex Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
[article]
Titre : Avoiding surface instability and slurry jamming in simultaneous multilayer coating of structured particulate films Type de document : texte imprimé Auteurs : J. Alex Lee, Auteur ; Aaron Kessman, Auteur ; David Shackleford, Auteur ; Martin Z. Bazant, Auteur ; Brian Barry, Auteur ; Courtland Chapman, Auteur ; Jeff Peet, Auteur Année de publication : 2022 Article en page(s) : p. 131–142 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Piles à combustible
Revêtements multicouchesTags : 'Revêtement multicouche' 'Glissière 'Emplacement double couche' Instabilité Boue Aqueux 'Système miscible' 'Épaississement par cisaillement' Marangoni SOFC 'Pile à combustible' Diffusion Index. décimale : 667.9 Revêtements et enduits Résumé : Simultaneous multilayer coating techniques are widely known, but their industrial application remains limited to narrow market sectors. One barrier to adoption may be the mismatch between industries that are familiar with such processes but have no need, and industries that have need but are not familiar. Moreover, there are application-specific technical challenges to developing multilayer-coating processes. In this article, we describe our resolution of two specific issues in simultaneous multilayer coating of all-aqueous highly loaded slurries for new and emerging energy applications. The first issue is particle jamming (associated with shear-thickening) of the highly loaded slurries in the die internals, which we alleviated by adding small amounts of viscosity modifiers without reducing the solid loading. The second issue is a Marangoni-driven surface instability that resembles top layer de-wetting, which we solved by carefully selecting surfactants to tune the dynamic surface tensions of each slurry. Both issues were resolved early in a step-wise development, saving significant development cost which in our case was driven by expensive materials. Note de contenu : - SLURRY JAMMING ASSOCIATED WITH SHEAR-THICKENING : Relevant literature on shear-thickening - Elimination of shear-thickening and jamming - Discussion of slurry jamming and rheology
- SURFACE INSTABILITY RESEMBLING TOP LAYER DE-WETTING : Spreading and the surface tension grading rule - Marangoni-driven self-thinning film flows - Relationship between surface tension grading and Marangoni instability - The role of dynamic surface tension in the Marangoni instability - Elimination of surface instability in simultaneous multilayer coating - Discussion on DST grading and mechanisms of multilayer coating instability
- Table 1 : Reformulation attempts to suppress shear-thickening
- Table 2 : Equilibrium surface tensions with air (EST) of incumbent and reformulated slurries’ supernatants. Measured by Biolin Attension Theta tensiometer at 22°C
- Table 3 : Comparison of EST and DST at different surface ages for different surfactants. Parentheses indicate difference from the value of S5DOI : https://doi.org/10.1007/s11998-021-00542-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00542-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37151
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 131–142[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23313 - Périodique Bibliothèque principale Documentaires Disponible Self stratifying coating : A review / Sudip Nath in PAINTINDIA, Vol. LII, N° 10 (10/2002)
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Titre : Self stratifying coating : A review Type de document : texte imprimé Auteurs : Sudip Nath, Auteur Année de publication : 2002 Article en page(s) : p. 31-40 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Autostratification 'Article synthèse' 'Revêtement multicouche' Stratification 'Formation film' Peinture 'Matériau revêtement' Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, recent advances in coating industries namely self-stratifying coating has been discussed from mechanistic point of view. After application as thinned film, self stratifying coating does spontaneously form two coherent layers as base coat/clear coat, primer/top coat in one single operation. The necessary requirements for this type of coating have been discussed in detail, including compatibility between the resins, surface energies and other parameters. Stratification can be predicted from the extent of overlaping of solubility spheres using Hansen solubility parameters (HSP) and surface energies. Various factors like evaporation rate, viscosity, film thickness and curing rate effecting self stratifying coating have also been focused on. Very good stratification have been observed in epoxy/acrylic, epoxy vinylether copolymer and epoxy/floro ethelene in their unpigmented systems. Success have also been achieved to locate a protective pigment in the primer and subsequent clear over it. Good stratification were also formulated with the adhesion promote silane coated rutile, where protective pigment was located in the primer layer while rutile in top-coat. Note de contenu : - THEORY FOR STRATIFICATION
- NECESSARY CONDITION FOR STRATIFICATION
- PREDICTION OF STRATIFICATION - Application of Hansen solubility parameter (HSP) - Stratification from solid resin surface energies - Solution surface energies
- FACTOR EFFECT STRATIFICATION - Preferential evaporation of solvents - Effect of curing agents on stratification - Film thickness - Pigments systems - Molecular weight - AdditivesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12413
in PAINTINDIA > Vol. LII, N° 10 (10/2002) . - p. 31-40[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001286 - Périodique Bibliothèque principale Documentaires Disponible