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J. Korean Ceram. Soc. > Volume 45(10); 2008 > Article
Journal of the Korean Ceramic Society 2008;45(10): 644.
doi: https://doi.org/10.4191/kcers.2008.45.1.644
졸 겔 법을 이용한 Cao-SiO2계 겔의 합성 및 구조분석
이태형, 이수정1, 황연, 김일용2, Chikara Ohtsuki2, 조성백1
서울산업대학교 신소재공학과
1한국지질자원연구원 자원활용소재연구부
2나고야대학 대학원 공학연구과
Preparation and Structural Analysis of Cao-SiO2 Gel by Sol-Gel Method
Tae-Hyung Lee, Su-Jeong Lee1, Yeon Hwang, Ill-Young Kim2, Chikara Ohtsuki2, Sung-Baek Cho1
Department of Materials Science & Engineering, Seoul National University of Technology
1Korea Institute of Geoscience and Mineral Resources
2Graduate School of Engineering, Nagoya University
It has been proposed that the Cao-$SiO_2$ binary system can be good basic composition of bioactive glasses and glass-ceramics. In the present study, various kinds of Cao-$SiO_2$ gels were prepared by sol-gel method in order to control the microstructure which are related to their dissolution rate, induction period of apatite formation in body environment. Characterization of the gels were done by wet chemical analysis, SEM observation, FT-IR spectroscopy and XRD. The gelation time decreased with CaO content. However, the volume of all the dried gel decreased to 50% of the wet gels irrespective of increasement of CaO content. All the Cao-$SiO_2$ gels were amorphous and contained a large amount of silanol groups on their surfaces after heat treatment up to $800^{circ}C$. The interconnected structure of the gel changed to agglomerated spherical powders when Ca content exceed to 20 mol%. Most of the Cao-$SiO_2$ gel showed amorphous when heat-treated up to $900^{circ}C$. However, quartz and cristobalite was produced when heat-treated at $1000^{circ}C$ and resultant microstructure of the gel contained microporous structure.
Key words: Sol-gel method, Cao-$SiO_2$ gel, Silanol group
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