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Particle coating of talc with tiO2 nanoparticles using ultrasonic irradiation in liquid CO2 / Kiyoshi Matsuyama in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1289–1296 Titre : Particle coating of talc with tiO2 nanoparticles using ultrasonic irradiation in liquid CO2 Type de document : texte imprimé Auteurs : Kiyoshi Matsuyama, Auteur ; Kenji Mishima, Auteur Année de publication : 2010 Article en page(s) : pp. 1289–1296 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Particle  Coating--Talc  with  TiO2--Nanoparticles--Ultrasonic--Irradiation--Liquid  CO2 Résumé : We describe particle coating using ultrasonic irradiation in liquid carbon dioxide (CO2). Talc (Mg3Si4O10(OH)2) microparticles were coated with hydrophilic and hydrophobic TiO2 nanoparticles. Shock waves generated by collapsing cavitation bubbles induced with ultrasonic irradiation accelerated the deagglomeration and dispersion of TiO2 nanoparticles and achieved dry particle coating in liquid CO2. Talc particles coated with TiO2 nanoparticles were observed using scanning electron microscopy (SEM). This revealed that the talc was completely coated with TiO2 nanoparticles, and a smooth coating surface was obtained. The flowability and wettability of the talc was improved by TiO2 nanoparticle coating. A comparative study was also conducted with conventional hand mixing and ultrasonic irradiation in water as a coating media. Effects of the experimental conditions (depressurizing method, ultrasonic intensity, TiO2 concentration, and TiO2 particle size) on the morphology and properties of the composite microparticles were also investigated. ISSN : 0888-5885 [article] Particle coating of talc with tiO2 nanoparticles using ultrasonic irradiation in liquid CO2 [texte imprimé] / Kiyoshi Matsuyama, Auteur ; Kenji Mishima, Auteur . - 2010 . - pp. 1289–1296. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1289–1296 Mots-clés : Particle  Coating--Talc  with  TiO2--Nanoparticles--Ultrasonic--Irradiation--Liquid  CO2 Résumé : We describe particle coating using ultrasonic irradiation in liquid carbon dioxide (CO2). Talc (Mg3Si4O10(OH)2) microparticles were coated with hydrophilic and hydrophobic TiO2 nanoparticles. Shock waves generated by collapsing cavitation bubbles induced with ultrasonic irradiation accelerated the deagglomeration and dispersion of TiO2 nanoparticles and achieved dry particle coating in liquid CO2. Talc particles coated with TiO2 nanoparticles were observed using scanning electron microscopy (SEM). This revealed that the talc was completely coated with TiO2 nanoparticles, and a smooth coating surface was obtained. The flowability and wettability of the talc was improved by TiO2 nanoparticle coating. A comparative study was also conducted with conventional hand mixing and ultrasonic irradiation in water as a coating media. Effects of the experimental conditions (depressurizing method, ultrasonic intensity, TiO2 concentration, and TiO2 particle size) on the morphology and properties of the composite microparticles were also investigated. ISSN : 0888-5885

Preparation of hollow ZnO microspheres using poly(methyl methacrylate) as a template with supercritical CO2-ethanol s / Kiyoshi Matsuyama in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8510–8517 Titre : Preparation of hollow ZnO microspheres using poly(methyl methacrylate) as a template with supercritical CO2-ethanol s Type de document : texte imprimé Auteurs : Kiyoshi Matsuyama, Auteur ; Kenji Mishima, Auteur ; Takafumi Kato, Auteur Année de publication : 2010 Article en page(s) : pp. 8510–8517 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Microspheres Résumé : Hollow ZnO microspheres were prepared using poly(methyl methacrylate) (PMMA) as a template with the assistance of supercritical CO2-ethanol solution. A precursor solution of zinc nitrate (Zn(NO3)2·6H2O) was dissolved in supercritical CO2/ethanol mixtures and was impregnated on the surface of the PMMA template. After the removal of the PMMA template by calcination in air, hollow ZnO microspheres were obtained. The products were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), nitrogen adsorption−desorption experiments, and scanning electronic microscopy (SEM). Furthermore, the effects of experimental conditions, such as the concentration of precursor, calcination temperature, impregnation media, and operating temperature during the depressurization process, on the particle morphology were investigated. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100551t [article] Preparation of hollow ZnO microspheres using poly(methyl methacrylate) as a template with supercritical CO2-ethanol s [texte imprimé] / Kiyoshi Matsuyama, Auteur ; Kenji Mishima, Auteur ; Takafumi Kato, Auteur . - 2010 . - pp. 8510–8517. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8510–8517 Mots-clés : Microspheres Résumé : Hollow ZnO microspheres were prepared using poly(methyl methacrylate) (PMMA) as a template with the assistance of supercritical CO2-ethanol solution. A precursor solution of zinc nitrate (Zn(NO3)2·6H2O) was dissolved in supercritical CO2/ethanol mixtures and was impregnated on the surface of the PMMA template. After the removal of the PMMA template by calcination in air, hollow ZnO microspheres were obtained. The products were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), nitrogen adsorption−desorption experiments, and scanning electronic microscopy (SEM). Furthermore, the effects of experimental conditions, such as the concentration of precursor, calcination temperature, impregnation media, and operating temperature during the depressurization process, on the particle morphology were investigated. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100551t