液相析出法におけるTiO_2粒子の成長挙動(<特集>水溶液科学に立脚したセラミックス合成プロセス)

概要

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TiO_2 particles were obtained from aqueous solutions by the liquid phase deposition (LPD) method. The crystalline anatase TiO_2 particles could be prepared below 100℃ directly from aqueous solutions. The growth behavior of TiO_2 particles via the LPD process was investigated by dynamic light scattering (DLS) measurement and transmission electron microscopy (TEM). From DLS measurement, the particle growth process shows a sigmoidal curve and can be divided into three stages, i.e., the initial stage, the acceleration stage, and the completion stage. TEM measurements revealed that the primary particles with a diameter of ca. 50 nm were deposited at the initial stage. At the acceleration stage, these primary particles were assembled to form raspberry-like particles with a diameter of ca. 300 nm. Finally, the particles were precipitated by further aggregation with the micrometer size at the completion stage.
社団法人日本セラミックス協会の論文
2007-12-01