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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 Surface rearrangement of tailored polyurethane-based coatings / Mariëlle Wouters in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 6 (04/2005)
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Titre : Surface rearrangement of tailored polyurethane-based coatings Type de document : texte imprimé Auteurs : Mariëlle Wouters, Auteur ; Teun Vereijken, Auteur ; Frank Huijs, Auteur ; Joyce van Zanten, Auteur Année de publication : 2005 Article en page(s) : p. 435-443 Note générale : Bibliogr. Langues : Américain (ame) Tags : Réarrangement surface Structure moléculaire Caoutchouc thermoplastique Propriété mécanique Etude expérimentale Dureté Résistance rayure Analyse Milieu aqueux Immersion Densité réticulation Relation structure propriété Angle contact composition Polymère fluor Matériau revêtement Uréthanne élastomère Index. décimale : 667.9 Revêtements et enduits Résumé : Polyurethane coatings with different network composition were prepared from an oligomeric diol, a diisocyanate, and a low molecular weight triol. The glass transition temperature of the network was tuned by the ratio of diol and triol and the composition (aromatic or aliphatic) of the diisocyanate. All coatings were studied for their bulk properties as well as their surface properties. It was found that by the addition of a fluorinated additive the surface free energy of the coating was lowered by approximately 15 mN.m-1, leaving the bulk properties intact. It was also shown that these polyurethane coatings are able to adapt their surface free energy in a reversible manner when exposed to water. The magnitude and rate of surface rearrangement is strongly dependent on the network density of the coating. DOI : 10.1007/BF02733886 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02733886.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3838
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 6 (04/2005) . - p. 435-443[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001483 - Périodique Bibliothèque principale Documentaires Disponible