噴霧熱分解法によるSiO_2被覆Pd粒子の合成と粒子構造の形成機構

概要

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Silica-encapsulated palladium particles were formed from a palladium nitrate solution containing ultrafine SiO_2 particles by ultrasonic spray pyrolysis. The mechanism of the formation of the encapsulated particles was investigated. A precursor particle formed below 700℃ in the drying stage was composed of the homogeneous mixture of the nano-sized SiO_2 and PdO・xH_2O particles. When PdO is decomposed above 700℃, metallic palladium particles are formed in the matrix of silica. Because of the high surface free energy, the metallic palladium particles coagulate and condense to the composite particle interior. As a result of the relocation within the composite particle, SiO_2 is forced out of the particle towards the surface to form a silica-encapsulated palladium particle.
社団法人日本セラミックス協会の論文
1997-03-01