TY - GEN
T1 - Silica-coating of barium titanate particles
AU - Matsumoto, Hideki
AU - Nagao, Daisuké
AU - Kobayashi, Yoshio
AU - Konno, Mikio
PY - 2007
Y1 - 2007
N2 - Barium titanate (BT) particles were coated with silica to improve their stability in water. The BT particles were prepared using a sol-gel method in a mixed solvent of ethanol and acetonitrile (weight ratio = 25/75) with additives of methylamine (MA) and acetylacetone. The silica coating was produced with the hydrolysis of tetraethylorthosilicate (TEOS) in the mixed solvent using a MA catalyst in the presence of the BT particles. TEM observation showed that the BT particles are spherical and have silica shells. The Zeta-potential measured for the coated BT particles with thick silica shells revealed that isoelectric point of the coated particles was almost consistent with that of silica particles. The size distribution of the coated particles was measured with dynamic light scattering (DLS) to examine the colloidal stability of the coated particles in water. The high stability of the coated particles was confirmed in the DLS measurement, and the averaged diameter of the coated particles obtained in this measurement was close to that obtained by TEM. Annealing of the coated particles produced fresnoite (Ba2TiSi2Og) crystallite particles.
AB - Barium titanate (BT) particles were coated with silica to improve their stability in water. The BT particles were prepared using a sol-gel method in a mixed solvent of ethanol and acetonitrile (weight ratio = 25/75) with additives of methylamine (MA) and acetylacetone. The silica coating was produced with the hydrolysis of tetraethylorthosilicate (TEOS) in the mixed solvent using a MA catalyst in the presence of the BT particles. TEM observation showed that the BT particles are spherical and have silica shells. The Zeta-potential measured for the coated BT particles with thick silica shells revealed that isoelectric point of the coated particles was almost consistent with that of silica particles. The size distribution of the coated particles was measured with dynamic light scattering (DLS) to examine the colloidal stability of the coated particles in water. The high stability of the coated particles was confirmed in the DLS measurement, and the averaged diameter of the coated particles obtained in this measurement was close to that obtained by TEM. Annealing of the coated particles produced fresnoite (Ba2TiSi2Og) crystallite particles.
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M3 - Conference contribution
AN - SCOPUS:57649195694
SN - 9780470184141
T3 - Ceramic Transactions
SP - 57
EP - 62
BT - Proceedings of the 2nd Int. Conf. Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials
T2 - 2nd International Conference on Characterization and Control of Interfaces for High Quality Advanced Materials, and Joining Technology for New Metallic Glasses and Inorganic Materials
Y2 - 6 September 2006 through 9 September 2006
ER -