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Controllable preparation of SiO2 nanoparticles using a microfiltration membrane dispersion microreactor / Le Du in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8536-8541 Titre : Controllable preparation of SiO2 nanoparticles using a microfiltration membrane dispersion microreactor Type de document : texte imprimé Auteurs : Le Du, Auteur ; Jing Tan, Auteur ; Kai Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 8536-8541 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Microreactor  Dispersion  Membrane  separation  Microfiltration  Nanoparticle  Preparation Résumé : The study presents a new technology for controllable preparation of SiO2 nanoparticles using a membrane dispersion microreactor. A gas―liquid precipitation reaction system was suggested for economics. (NH4)2SiF6 aqueous solution, a byproduct from wet-process phosphoric acid technology, was supplied as the reactant. Pure ammonia (NH3) was used as the precipitation agent. A microfiltation membrane with 0.2 μm pore size was used as the microdispersion medium to control the bubble size. The effect of various operation parameters on nanoparticles was determined, and the process was optimized. The SiO2 nanoparticles were characterized by X-ray powder diffraction, transmission electron microscopy, and Brunauer―Emmet―Teller analysis. The results showed that the preparation process could be easily controlled. The SiO2 nanoparticles were of a pseudospherical shape, the average particle size of which could vary from 10 to 150 nm. The particle size distribution was relatively narrow, and a specific surface area of around 360 m2/g was reached. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346895 [article] Controllable preparation of SiO2 nanoparticles using a microfiltration membrane dispersion microreactor [texte imprimé] / Le Du, Auteur ; Jing Tan, Auteur ; Kai Wang, Auteur . - 2011 . - pp. 8536-8541. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8536-8541 Mots-clés : Microreactor  Dispersion  Membrane  separation  Microfiltration  Nanoparticle  Preparation Résumé : The study presents a new technology for controllable preparation of SiO2 nanoparticles using a membrane dispersion microreactor. A gas―liquid precipitation reaction system was suggested for economics. (NH4)2SiF6 aqueous solution, a byproduct from wet-process phosphoric acid technology, was supplied as the reactant. Pure ammonia (NH3) was used as the precipitation agent. A microfiltation membrane with 0.2 μm pore size was used as the microdispersion medium to control the bubble size. The effect of various operation parameters on nanoparticles was determined, and the process was optimized. The SiO2 nanoparticles were characterized by X-ray powder diffraction, transmission electron microscopy, and Brunauer―Emmet―Teller analysis. The results showed that the preparation process could be easily controlled. The SiO2 nanoparticles were of a pseudospherical shape, the average particle size of which could vary from 10 to 150 nm. The particle size distribution was relatively narrow, and a specific surface area of around 360 m2/g was reached. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346895