Wet coating of calcite with silica nanoparticles in CO2 environment / Qitong Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 423-434 Titre : Wet coating of calcite with silica nanoparticles in CO2 environment Type de document : texte imprimé Auteurs : Qitong Liu, Auteur ; Payam Hosseini, Auteur ; Raghavendra Ragipani, Auteur ; Bu Wang, Auteur Année de publication : 2024 Article en page(s) : p. 423-434 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calcite Grâce à leurs performances analytiques, on observe un intérêt croissant pour l’utilisation des installations en rayonnement synchrotron et de certains appareils portables employant des sources de rayons X afin d’analyser, de révéler et de conserver les matériaux des objets du patrimoine. La diffraction des rayons X va ainsi permettre de révéler la complexité de la nature des pigments utilisés par les artistes : c’est par la structure de la matière cristalline que l’on peut comprendre certaines de leurs propriétés optiques et mécaniques ainsi que leurs modes de synthèse. Caractérisation Dioxyde de silicium Enrobage (technologie) Granulométrie Nanoparticules Particules (matières) Potentiel zeta Revêtement humide Index. décimale : 667.9 Revêtements et enduits Résumé : Calcite particles coated with nano-silica find use in applications such as enhanced oil recovery, paper-making, and thermal energy storage. In this study, the surface coating of calcite particles by silica nanoparticles (nano-SiO2) in aqueous solutions assisted by a CO2 environment was investigated. The result indicates that the coating performance can be controlled by altering the electrostatic attraction between calcite and nano-SiO2, with the calcite surface charge being the predominant factor. An elevated CO2 partial pressure (up to 3.7 atm) is beneficial for the coating process. However, similar coating performance can be achieved under lower CO2 partial pressures by introducing calcium salt into the aqueous solution. With the addition of 15 wt% of nano-SiO2 in a 6.5 mM CaCl2 solution, a nano-SiO2 loading content of 12.6 wt% (with an average calcite particle size of 6.74 µm) was achieved under 1 atm CO2 pressure after 24 h of the coating experiment. Overall, the coating of calcite surfaces with high contents of well-dispersed nano-SiO2 can be achieved in a CO2 environment, and calcium salts can be used to reduce the required CO2 pressure. As such, it is potentially feasible to integrate wet coating into aqueous carbonation-based CO2 mineralization processes to enhance process economics by making nano-SiO2-coated calcite a valuable byproduct. Note de contenu : - MATERIALS AND METHODS : Materials - Coating experiment - Sample characterizations - Particle size analysis (PSA) - Scanning electron microscopy (SEM) - Thermogravimetric analysis (TGA) - Zeta potential (ZP) measurement - Surface area measurement - Stability test - RESULTS AND DISCUSSION : Characterization of calcite coated with nano-SiO2 - Effect of the CO2 environment on coating performance - Role of calcium concentration in coating performance - Enhancing the experimental feasibility and loading content - Table 1 : The zeta potential of calcite and nano-SiO2 - Table 2 : Quantity of coated nano-SiO2 before and after stability tests DOI : https://doi.org/10.1007/s11998-023-00812-4 En ligne : https://drive.google.com/file/d/1zoCnzLvSPDBemL0-7QZUZBTVJBQUMfjp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40463 [article]

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