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Continuous aerosol photopolymerization to coat de-agglomerated nanoparticles

Hamed Nasri Lari, Jamal Chaouki, Jason Robert Tavares

Article (2020)

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Abstract

A novel continuous aerosol photopolymerization technique to coat nanoparticles that have beenpreviously de-agglomerated is presented. After de-agglomeration in a jet-impactor assisted fluidizedbed, monomer vapors are condensed onto the surface of aerosol nanoparticles via heterogeneouscondensation. Photopolymerization is initiated through exposure to UV light. To demonstrate theprocess, titanium dioxide (TiO2) and methyl methacrylate (MMA) were selected as nanoparticle andorganic monomer, respectively. We demonstrated this light-based technique, operated at ambientpressure and room temperature, is able to graft a PMMA-like film with a thickness of 1.5 nm on thesurface of nanoparticles, confirmed by TEM and FTIR. XPS analysis confirmed formation of covalentbonds with the TiO2 surface, indicating a surface-initiated photopolymerization. Particle sizemeasurements in suspension state illustrated the efficiency of the de-agglomeration and subsequentcoating process, as coated particles remained smaller than bare particles. UV-Vis absorbance spectrashow 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 particleparticleand particle-solvent. This technique can be easily combined with any continuous inorganicnanoparticle synthesis processes as a solvent-free post-synthesis process to impart a functional coating.

Uncontrolled Keywords

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

Subjects: 1800 Chemical engineering > 1800 Chemical engineering
2000 Materials science and technology > 2004 Polymers and coatings
Department: Department of Chemical Engineering
Funders: CRSNG/NSERC, Canada Foundation for Innovation, Sigma Xi Grants-in-Aid of Research
Grant number: 418447-2013, 458788-2014, 33887, G20141015728200
PolyPublie URL: https://publications.polymtl.ca/10442/
Journal Title: Chemical Engineering Journal (vol. 390)
Publisher: Elsevier
DOI: 10.1016/j.cej.2020.124526
Official URL: https://doi.org/10.1016/j.cej.2020.124526
Date Deposited: 01 Sep 2022 12:55
Last Modified: 19 Nov 2022 05:14
Cite in 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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