| Summary: | 碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 96 === Crystalline LaAlO3 nanoparticles were prepared using a spray pyrolysis process. Citric acid, as a chelating agent, was added into the aqueous solution containing the stoichiometric amount of lanthanum nitrate and aluminum nitrate to form LaAlO3. The obtained solution was then adjusted to neutral condition using NH4OH and/or HNO3. The neutral aqueous solution was transform to solution aerosols by a two-fluid type atomizer. The formed aerosols were introduced to the reaction tube and after solvent evaporation and solid salt decomposion, the resultant solid particles were collected using an electrostatic precipitator. The as-formed particles and the post-treated particles were characterized using thermogravimetric analysis, thermal differential analysis, infrared spectroscopy, x-ray diffractomtry, scanning electron microscopy, and transmission electron microscopy. The particles directly collected on the end of the process were noncrystalline hollow spherical particles with particle sizes in several micrometers. After heating the as-formed particles at 700℃ and grinding the calcined particles, crystalline LaAlO3 nanoparticles were obtained.
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