Direct Fabricaton of Ceramics Nano-Composites by Solution Processing

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This study aimed direct fabrication of ceramics nano-composites and/or nano-hybrids by Solution Processing. Following results have been obtained :1) TiO_2/hydroxyapatite nano-compositesTo combine photocatalitic activity of TiO_2 and chemical and biological absorption of hydroxyapatite, their nano-composites have been fabricated in a single step in a solution. Calcium carbonate powders were hydrothermally treated at 100-180℃ in the mixture of H_3PO_4 and water soluble Ti complex solution Anatase nanocrystals with 20 nm width and 60 nm length have been deposited on the surface of hydroxyapatite micro-crystals with severe μm size. Theses composites showed higher photocatalytic activities than TiO_2 only.2) Nano-particles of CeO_2-ZrO_2 Solid SolutionsIn the advance of nano-particle synthesis, we have succeeded to fabricate the nano-particle of metastable tetragonal solid solutions in the CeO_2-ZrO_2 system, by hydrothermal methods at 100 - 150℃ for their co-precipitates.3) Carbon nano-cells and patternsBy applying the electro-discharge in non-aqueous solvents, we could succeed to obtain metal encapsulated carbon nano-cells with 10-100 nm in size, and a pattern of ammorphous carbon directly on conducting substrates. It is very interesting that carbon patterning could be established in liquid phase.