TY - JOUR
T1 - Effect of reaction temperature on CVD-made TiO2 primary particle diameter
AU - Nakaso, Koichi
AU - Okuyama, Kikuo
AU - Shimada, Manabu
AU - Pratsinis, Sotiris E.
N1 - Funding Information:
The authors thank Mr. Fukumoto, Mr. Kojio and Mr. Tomonaga (Hiroshima University) for their help in the experiment. This work was supported in part by Research Fellowships of the Japan Society for the Promotion of Science (JSPS) for Young Scientists (Grant No. 01238), by grant-in-aid for scientific research from the Ministry of Education, Science, Sports, and Culture of Japan, by the New Energy and Industrial Technology Development Organization (NEDO)'s “Nanotechnology Materials Program-Nanotechnology Particle Project” based on fund provided by the Ministry of Economy, Trade, and Industry (METI), Japan, and by Hosokawa Powder Technology Foundation.
PY - 2003/8
Y1 - 2003/8
N2 - The effect of chemical reaction rate on the generation of titania nanoparticles by chemical vapor deposition using two different precursors was investigated by FTIR, XRD, and microscopy. The size of the primary particle exhibited a minimum with increasing reactor temperature. At lower reaction temperatures, the continuous and gradual formation of titania monomers occurred followed by coagulation and/or surface reaction on the existing particles. In addition, unreacted precursor condensed at the reactor exit. As the reaction temperature increased, the rate of monomer production increased, the dominant characteristics of particle growth were coagulation and sintering. The reactor temperature where the minimum primary particle diameter was produced was different for the two precursors due to differences in chemical reaction rates. Phase composition as well as the primary particle diameter of product titania were affected by the chemical reaction rate. Particle-laden reactor wall enhanced the precursor conversion at low reactor temperatures, where surface reactions compete effectively with gas-phase precursor conversion.
AB - The effect of chemical reaction rate on the generation of titania nanoparticles by chemical vapor deposition using two different precursors was investigated by FTIR, XRD, and microscopy. The size of the primary particle exhibited a minimum with increasing reactor temperature. At lower reaction temperatures, the continuous and gradual formation of titania monomers occurred followed by coagulation and/or surface reaction on the existing particles. In addition, unreacted precursor condensed at the reactor exit. As the reaction temperature increased, the rate of monomer production increased, the dominant characteristics of particle growth were coagulation and sintering. The reactor temperature where the minimum primary particle diameter was produced was different for the two precursors due to differences in chemical reaction rates. Phase composition as well as the primary particle diameter of product titania were affected by the chemical reaction rate. Particle-laden reactor wall enhanced the precursor conversion at low reactor temperatures, where surface reactions compete effectively with gas-phase precursor conversion.
KW - Agglomeration
KW - Chemical processes
KW - Condensation
KW - Particle formation
KW - Reaction engineering
KW - Sintering
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U2 - 10.1016/S0009-2509(03)00213-6
DO - 10.1016/S0009-2509(03)00213-6
M3 - Article
AN - SCOPUS:0041565318
VL - 58
SP - 3327
EP - 3335
JO - Chemical Engineering Science
JF - Chemical Engineering Science
SN - 0009-2509
IS - 15
ER -