Synthesis of ceramics in MOn/2-SiO2 systems through sol-gel processing under coexistence of polyethylene glycol and in vitro evaluation of their bioactivity
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- KIM Ill-Yong
- Graduate School of Engineering, Nagoya University
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- KAMITAKAHARA Masanobu
- Graduate School of Environmental Studies, Tohoku University
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- KAWACHI Giichiro
- Graduate School of Engineering, Nagoya University
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- KIKUTA Koichi
- Graduate School of Engineering, Nagoya University
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- CHO Sung-Baek
- Korea Institute of Geosciences and Mineral Resources (KIGAM)
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- OHTSUKI Chikara
- Graduate School of Engineering, Nagoya University
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Sol-gel processing from tetraethoxysilane (TEOS) under coexistence of polyethylene glycol (PEG) allows controlled morphology of the formed silica because of the phase separation during the polycondensation of the hydrated sol. The presence of PEG controlled the morphology effective in preparation of the ceramics, even in the CaO-SiO2 binary system, starting from TEOS and Ca(NO3)2. In the present study, some ceramics were prepared using the MOn/2-SiO2 binary systems, where M is given as Na+ (n=1), Mg2+ (n=2) and Al3+ (n=3), through sol-gel processing in the presence of PEG, to compare the compositional changes in the morphology of the ceramics. In the case of NaO1/2-SiO2, the framework size increased remarkably with increasing amounts of Na+ in the starting compositions up to 30 mol%, while continuous pores of approximately 10 μm were observed at 5 mol% of Na+. In the case of MgO-SiO2, the framework size increased with increasing amounts of Mg2+ up to 20 mol% in the starting composition. Aggregation of particles with approximately 3 μm in size was observed at 25 mol% and more. The trend in morphological change with addition of Mg2+ was quite similar to that with Ca2+. With AlO3/2-SiO2, particles were obtained when the starting composition was more than 10 mol% Al3+. The size of the particles appeared to decrease with increasing amounts of Al3+. The morphology and phase separation behavior are strongly affected by the charge value of the metal ions, because the number of non-bridging oxygens coordinated to the metal ion increased with increasing charge value in the sol-gel processing. A specimen prepared with starting composition 20NaO1/2•80SiO2 and heated at 600°C formed hydroxyapatite on the particle surfaces within 7 d after soaking in a simulated body fluid (SBF), suggesting a potential for bioactivity on application of bone repair.<br>
収録刊行物
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- Journal of the Ceramic Society of Japan
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Journal of the Ceramic Society of Japan 116 (1349), 56-62, 2008
公益社団法人 日本セラミックス協会
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詳細情報 詳細情報について
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- CRID
- 1390282680259289472
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- NII論文ID
- 110006614242
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- NII書誌ID
- AA12229489
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- ISSN
- 13486535
- 18820743
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- NDL書誌ID
- 9312684
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可