Documents disponibles écrits par cet auteur

Design of aerosol coating reactors / Beat Buesser in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13831-13839 Titre : Design of aerosol coating reactors : precursor injection Type de document : texte imprimé Auteurs : Beat Buesser, Auteur ; Sotiris E. Pratsinis, Auteur Année de publication : 2012 Article en page(s) : pp. 13831-13839 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Precursor  Reactor  Aerosols  Design Résumé : Particles are coated with thin shells to facilitate their processing and incorporation into liquid or solid matrices without altering core particle properties (coloristic, magnetic, etc.). Here, computational fluid and particle dynamics are combined to investigate the geometry of an aerosol reactor for continuous coating of freshly made titanium dioxide core nanoparticles with nanothin silica shells by injection of hexamethyldisiloxane (HMDSO) vapor downstream of TiO2 particle formation. The focus is on the influence of HMDSO vapor jet number and direction, in terms of azimuth and inclination jet angles, on process temperature and coated particle characteristics (shell thickness and fraction of uncoated particles). Rapid and homogeneous mixing of core particle aerosol and coating precursor vapor facilitates synthesis of core–shell nanoparticles with uniform shell thickness and high coating efficiency (minimal uncoated core and free coating particles). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299848 [article] Design of aerosol coating reactors : precursor injection [texte imprimé] / Beat Buesser, Auteur ; Sotiris E. Pratsinis, Auteur . - 2012 . - pp. 13831-13839. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13831-13839 Mots-clés : Precursor  Reactor  Aerosols  Design Résumé : Particles are coated with thin shells to facilitate their processing and incorporation into liquid or solid matrices without altering core particle properties (coloristic, magnetic, etc.). Here, computational fluid and particle dynamics are combined to investigate the geometry of an aerosol reactor for continuous coating of freshly made titanium dioxide core nanoparticles with nanothin silica shells by injection of hexamethyldisiloxane (HMDSO) vapor downstream of TiO2 particle formation. The focus is on the influence of HMDSO vapor jet number and direction, in terms of azimuth and inclination jet angles, on process temperature and coated particle characteristics (shell thickness and fraction of uncoated particles). Rapid and homogeneous mixing of core particle aerosol and coating precursor vapor facilitates synthesis of core–shell nanoparticles with uniform shell thickness and high coating efficiency (minimal uncoated core and free coating particles). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299848

Design of turbulent flame aerosol reactors by mixing-limited fluid dynamics / Arto J. Grohn in Industrial & engineering chemistry research, Vol. 50 N° 6 (Mars 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3159–3168 Titre : Design of turbulent flame aerosol reactors by mixing-limited fluid dynamics Type de document : texte imprimé Auteurs : Arto J. Grohn, Auteur ; Beat Buesser, Auteur ; Jorma K. Jokiniemi, Auteur Année de publication : 2011 Article en page(s) : pp. 3159–3168 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Turbulent  Fluid  dynamics Résumé : Nanoparticle synthesis in turbulent flame aerosol reactors is elucidated by computational fluid dynamics (CFD). Mixing-limited combustion is modeled, and total particle number, area, and volume concentration are described by transport equations including terms for particle dynamics. The spread of the particle size distribution at a given streamline is neglected as flame-made aerosols rapidly attain their self-preserving distribution. Results are in good agreement with primary particle data of turbulent diffusion flame synthesis of silica nanoparticles by oxidation of hexamethyldisiloxane vapor at different laboratories without adjustable parameters. Measured agglomerate mobility diameters best matched the predicted volume-equivalent soft-agglomerate diameters. The employed fractal-like dimensions (Df = 1.5−3) had no effect on the predicted primary particle and aggregate diameters and a rather small effect on volume-equivalent soft-agglomerate diameters. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1017817 [article] Design of turbulent flame aerosol reactors by mixing-limited fluid dynamics [texte imprimé] / Arto J. Grohn, Auteur ; Beat Buesser, Auteur ; Jorma K. Jokiniemi, Auteur . - 2011 . - pp. 3159–3168. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3159–3168 Mots-clés : Turbulent  Fluid  dynamics Résumé : Nanoparticle synthesis in turbulent flame aerosol reactors is elucidated by computational fluid dynamics (CFD). Mixing-limited combustion is modeled, and total particle number, area, and volume concentration are described by transport equations including terms for particle dynamics. The spread of the particle size distribution at a given streamline is neglected as flame-made aerosols rapidly attain their self-preserving distribution. Results are in good agreement with primary particle data of turbulent diffusion flame synthesis of silica nanoparticles by oxidation of hexamethyldisiloxane vapor at different laboratories without adjustable parameters. Measured agglomerate mobility diameters best matched the predicted volume-equivalent soft-agglomerate diameters. The employed fractal-like dimensions (Df = 1.5−3) had no effect on the predicted primary particle and aggregate diameters and a rather small effect on volume-equivalent soft-agglomerate diameters. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1017817

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