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Role of gas-aerosol mixing during in situ coating of flame-made titania particles / Alexandra Teleki in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 85-92 Titre : Role of gas-aerosol mixing during in situ coating of flame-made titania particles Type de document : texte imprimé Auteurs : Alexandra Teleki, Editeur scientifique ; Beat Buesser, Editeur scientifique ; Martin C. Heine, Editeur scientifique Année de publication : 2009 Article en page(s) : p. 85-92 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas-aerosol  Flame  Titania  X-ray  Photocatalysis Résumé : Rutile TiO2 particles of 40 nm average diameter were made by flame spray pyrolysis (FSP) and in situ coated with ultrathin (2−4 nm) SiO2 layers. The spray flame was enclosed by a quartz glass tube while hexamethyldisiloxane (HMDSO) vapor-laden N2 was injected in swirling crossflow to and downstream of the flame through a metal torus pipe ring. The as-prepared powders were characterized by transmission electron microscopy (TEM), X-ray diffraction, and nitrogen adsorption. The effect of mixing between HMDSO-laden N2 jets and freshly made titania aerosol on product coating quality was investigated by varying systematically the number and gas flowrate through these jets experimentally and by computational fluid dynamics. The coating quality of titanium dioxide was evaluated further by photocatalysis of isopropanol to acetone under UV light using suspensions of the above particles. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800226d [article] Role of gas-aerosol mixing during in situ coating of flame-made titania particles [texte imprimé] / Alexandra Teleki, Editeur scientifique ; Beat Buesser, Editeur scientifique ; Martin C. Heine, Editeur scientifique . - 2009 . - p. 85-92. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 85-92 Mots-clés : Gas-aerosol  Flame  Titania  X-ray  Photocatalysis Résumé : Rutile TiO2 particles of 40 nm average diameter were made by flame spray pyrolysis (FSP) and in situ coated with ultrathin (2−4 nm) SiO2 layers. The spray flame was enclosed by a quartz glass tube while hexamethyldisiloxane (HMDSO) vapor-laden N2 was injected in swirling crossflow to and downstream of the flame through a metal torus pipe ring. The as-prepared powders were characterized by transmission electron microscopy (TEM), X-ray diffraction, and nitrogen adsorption. The effect of mixing between HMDSO-laden N2 jets and freshly made titania aerosol on product coating quality was investigated by varying systematically the number and gas flowrate through these jets experimentally and by computational fluid dynamics. The coating quality of titanium dioxide was evaluated further by photocatalysis of isopropanol to acetone under UV light using suspensions of the above particles. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800226d