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Continuous aerosol photopolymerization to coat de-agglomerated nanoparticles

Hamed Nasri Lari, Jamal Chaouki et Jason Robert Tavares

Article de revue (2020)

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Abstract

A novel continuous aerosol photopolymerization technique to coat nanoparticles that have been previously de-agglomerated is presented. After de-agglomeration in a jet-impactor assisted fluidized bed, monomer vapors are condensed onto the surface of aerosol nanoparticles via heterogeneous condensation. Photopolymerization is initiated through exposure to UV light. To demonstrate the process, titanium dioxide (TiO2) and methyl methacrylate (MMA) were selected as nanoparticle and organic monomer, respectively. We demonstrated this light-based technique, operated at ambient pressure and room temperature, is able to graft a PMMA-like film with a thickness of 1.5 nm on the surface of nanoparticles, confirmed by TEM and FTIR. XPS analysis confirmed formation of covalent bonds with the TiO2 surface, indicating a surface-initiated photopolymerization. Particle size measurements in suspension state illustrated the efficiency of the de-agglomeration and subsequent coating process, as coated particles remained smaller than bare particles. UV-Vis absorbance spectra show that the coating facilitates dispersion in non-polar solvents. Finally, long-term stability experiment confirmed the suspension stability is enhanced not only because of the reduction of agglomerate sizes, but also as a result of the carbon coating which improves the interfacial interactions between particleparticle and particle-solvent. This technique can be easily combined with any continuous inorganic nanoparticle synthesis processes as a solvent-free post-synthesis process to impart a functional coating.

Mots clés

nanoparticle; coating; aerosol; photopolymerization; continuous; Photo-initiated Chemical Vapor Deposition (PICVD)

Sujet(s): 1800 Génie chimique > 1800 Génie chimique
2000 Science et technologie des matériaux > 2004 Polymères et revêtements
Département: Département de génie chimique
Organismes subventionnaires: CRSNG/NSERC, Canada Foundation for Innovation, Sigma Xi Grants-in-Aid of Research
Numéro de subvention: 418447-2013, 458788-2014, 33887, G20141015728200
URL de PolyPublie: https://publications.polymtl.ca/10442/
Titre de la revue: Chemical Engineering Journal (vol. 390)
Maison d'édition: Elsevier
DOI: 10.1016/j.cej.2020.124526
URL officielle: https://doi.org/10.1016/j.cej.2020.124526
Date du dépôt: 01 sept. 2022 12:55
Dernière modification: 26 sept. 2024 17:02
Citer en APA 7: Nasri Lari, H., Chaouki, J., & Tavares, J. R. (2020). Continuous aerosol photopolymerization to coat de-agglomerated nanoparticles. Chemical Engineering Journal, 390, 124526 (12 pages). https://doi.org/10.1016/j.cej.2020.124526

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