Documents disponibles écrits par cet auteur

Utilizing polystyrene microspheres as confined space to help TiO2 nanocrystals formation with assistance of supercritical CO2 / Aping Niu in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7103–7109 Titre : Utilizing polystyrene microspheres as confined space to help TiO2 nanocrystals formation with assistance of supercritical CO2 Type de document : texte imprimé Auteurs : Aping Niu, Auteur ; Yan Li, Auteur ; Jiafu Chen, Auteur Année de publication : 2009 Article en page(s) : pp. 7103–7109 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Titania  nanocrystals  Tetrabutyl  titanate  Polystyrene  microspheres Résumé : Titania nanocrystals were prepared by a particular way: first, supercritical CO2 (SC CO2) carried precursor tetrabutyl titanate (TBT) into the confined space of polystyrene (PS) microspheres; second, hydrolysis of TBT was controlled by the confined space of PS microspheres, which had a restraining effect on the hydrolysis rate of TBT; finally, TiO2 nanocrystals were obtained by calcining PS@TiO2 composite microspheres. The products obtained after hydrolysis and calcination, that is, PS@TiO2 composite microspheres and the finally obtained TiO2 nanocrystals, were characterized by transmission electron microscope and scanning electron microscope, respectively. Further high-resolution transmission electron microscopy and X-ray diffraction (XRD) indicated that the obtained TiO2 nanocrystals had fine crystalline structure. Additionally, the XRD pattern verified the presence of anatase and rutile in TiO2. The nucleation mechanism of TiO2 nanocrystals in the confined space of PS microspheres was also proposed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900204y [article] Utilizing polystyrene microspheres as confined space to help TiO2 nanocrystals formation with assistance of supercritical CO2 [texte imprimé] / Aping Niu, Auteur ; Yan Li, Auteur ; Jiafu Chen, Auteur . - 2009 . - pp. 7103–7109. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7103–7109 Mots-clés : Titania  nanocrystals  Tetrabutyl  titanate  Polystyrene  microspheres Résumé : Titania nanocrystals were prepared by a particular way: first, supercritical CO2 (SC CO2) carried precursor tetrabutyl titanate (TBT) into the confined space of polystyrene (PS) microspheres; second, hydrolysis of TBT was controlled by the confined space of PS microspheres, which had a restraining effect on the hydrolysis rate of TBT; finally, TiO2 nanocrystals were obtained by calcining PS@TiO2 composite microspheres. The products obtained after hydrolysis and calcination, that is, PS@TiO2 composite microspheres and the finally obtained TiO2 nanocrystals, were characterized by transmission electron microscope and scanning electron microscope, respectively. Further high-resolution transmission electron microscopy and X-ray diffraction (XRD) indicated that the obtained TiO2 nanocrystals had fine crystalline structure. Additionally, the XRD pattern verified the presence of anatase and rutile in TiO2. The nucleation mechanism of TiO2 nanocrystals in the confined space of PS microspheres was also proposed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900204y