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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 131–142 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 multicouches Tags : '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 S5 DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37151 [article]

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Coupled effect of water absorption and ion transport in hydrated latex anti-corrosion coatings / Yu Ren Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 1 (01/2023) . - p. 187-200 Titre : Coupled effect of water absorption and ion transport in hydrated latex anti-corrosion coatings Type de document : texte imprimé Auteurs : Yu Ren Zhou, Auteur ; Surya Effendy, Auteur ; Juner Zhu, Auteur ; Michael T. Petr, Auteur ; Colin Cwalina, Auteur ; Martin Z. Bazant, Auteur ; Bilge Yildiz, Auteur ; Ju Li, Auteur ; Michael P. Short, Auteur Année de publication : 2023 Article en page(s) : p. 187-200 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Gonflement (physique) Humidité -- Absorption:Eau -- Absorption Latex Revêtements en phase aqueuse Revêtements organiques Revêtements protecteurs Transports d'ions Index. décimale : 667.9 Revêtements et enduits Résumé : Water-based anti-corrosion coatings, which are environmentally-friendly replacements for organic solvent-based coatings, do not perform well enough for use in the most challenging corrosion environments. The high water absorption capacity of water-based latex films may reduce barrier performance by contributing to corrosive reactant/product transport. We seek to understand the coupled effects of water absorption and ion transport in hydrated latex films, and to propose mechanisms explaining these effects. Water absorption and ion transport in films immersed in deionized (DI) water were monitored by mass gain and electrical conductivity measurements, respectively. Despite very similar polymer compositions between films, large differences in water absorption and ion transport rates were observed and explained by percolating networks at latex particle boundaries which facilitate transport. A semi-continuum model with three-component diffusion and convection-like elastic relaxation supported the assumptions of the physical mechanisms governing water absorption and ion transport. The evidence of the coupled processes of water absorption and ion transport in hydrated latex films revealed in this study are useful for designing water-based coatings that provide high levels of corrosion resistance. Note de contenu : - METHODOLOGY : Paint composition - Water absorption - Leached ion transport - Cross-section scanning electron microscopy (SEM) - Structural and chemical characterization - RESULTS AND DISCUSSION : SAXS and FTIR results - Water entry mechanism into latex films - Effect of water absorption on ion leaching -Semi-continuum model - Model fitting procedure - Model output and results - Comparison of model and experiment - Model validation - Table 1 : List of boundary conditions at the plane of symmetry and at the film/water interface - Table 2 : List of known and fitted parameter values for SF-NP and SF-TiO2 - Table 3 : Validation data set is obtained by mass balance, assuming sodium chloride mobile ions and di(propylene glycol) n-butyl ether coalescent DOI : https://doi.org/10.1007/s11998-022-00676-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00676-0.pdf?pdf=button Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38835 [article]

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