The hydrothermal treatment was applied to sericin and the hydrolysis behavior was investigated. The gel filtration chromatography revealed that sericin was hydrolyzed to di-or tri-peptide easily when the treatment was made at 200*. In addition, the hydrolyzate obtained showed an antioxidant activity against DPPH radicals.
The effects of the presence of Ga 2 O 3 on low-temperature sintering and the phase stability of 4, 5, and 6 mol% Sc 2 O 3 -doped tetragonal zirconia ceramics (4ScSZ, 5ScSZ, and 6ScSZ, respectively) were investigated. A series of zirconia sintered bodies with compositions (ZrO 2 ) 0.99 -x (Sc 2 O 3 ) x (Ga 2 O 3 ) 0.01 , x = 0.04, 0.05, and 0.06 was fabricated by sintering at 1000°C to 1500°C for 1 h using fine powders that were prepared via the combination of homogeneous precipitation method and hydrolysis technique using monoclinic zirconia sols synthesized through the forced hydrolysis of an aqueous solution of zirconium oxychloride at 100°C for 168 h. The presence of 1 mol% Ga 2 O 3 was effective in reducing sintering temperature necessary to fabricate dense bodies and enabled to obtain dense sintered bodies via sintering at 1100°C for 1 h. The phase stability, that is, low-temperature degradation behavior of the resultant zirconia ceramics was determined under hydrothermal condition. The zirconia ceramics codoped with 1 mol% Ga 2 O 3 and 6 mol% Sc 2 O 3 (1Ga6ScZ) fabricated via sintering at 1300°C for 1 h showed high phase stability without the appearance of monoclinic zirconia phase, that is the tetragonal-tomonoclinic phase transformation was not observed in the 1Ga6ScZ after treatment under hydrothermal condition at 150°C for 30 h.
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