Spherical particles and their surface properties. III. Formation of spherical particles of metal oxides by O2-H2 flame fusion.

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概要

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• The formation mechanism of spherical particles of various metal oxides through O<SUB>2</SUB>–H<SUB>2</SUB> flame fusion was investigated. Molten droplets of Al<SUB>2</SUB>O<SUB>3</SUB> are solidified to form spherical particles having the structure of δ- and θ-Al<SUB>2</SUB>O<SUB>3</SUB> in the surface layer and α-Al<SUB>2</SUB>O<SUB>3</SUB> inside. Heat treatment of the spherical particles of Al<SUB>2</SUB>O<SUB>3</SUB> at temperatures higher than 1573 K gave rise to the transition from δ- and θ-Al<SUB>2</SUB>O<SUB>3</SUB> to α-Al<SUB>2</SUB>O<SUB>3</SUB> and made the crystal growth, but no change in the smooth surface structure was observed, contrary to the case of TiO<SUB>2</SUB> where facetting of the surface occurred on heating. In the cases of NiO and Cr<SUB>2</SUB>O<SUB>3</SUB>, particles bigger than 2–3 μm in diameter are spherical, but smaller ones are apt to form single crystals. With ZnO, SnO<SUB>2</SUB>, and MgO, no spherical particles were formed. It is suggested that amorphous or polymorphous substances easily form spherical particles but monomorphous ones do not. Substances, which can sublime or have higher melting point, do not give pherical particles but only single crystals.

• 公益社団法人 日本化学会の論文

著者

• Morimoto Tetsuo

  Department Of Biomechanical Systems Ehime University

• Kittaka Shigeharu

  Department Of Chemistry Faculty Of Science Okayama University Of Science

• MORIMOTO Tetsuo

  Department of Bio-mechanical Systems, Faculty of Agriculture, Ehime University

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