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  • 02월 19일 10시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

대한화학회 제121회 학술발표회 및 총회 Unique transformation behavior of manganese oxide nanocrystal during high temperature solid-state reaction within silica nanosphere

등록일
2018년 2월 7일 15시 52분 54초
접수번호
5410
발표코드
INOR.P-180 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 19일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Inorganic Chemistry
저자 및
공동저자
Taewan Kwon, Kyun sang Ji, In Su Lee*
Department of Chemistry, Pohang University of Science and Technology, Korea
The solid-state conversion of nanoparticles is the attractive synthetic approach which would contribute to understanding of conversion chemistry in nanoscale. We observed the unique thermal transformation behavior above the glass transition temperature (Tg) of silicate nanoparticles. The hollow manganese silicate nanoparticles, which are formed from MnO@SiO2 nanoparticles via reductive annealing process, refill their interior voids with surrounding manganese silicate phase at higher temperature than Tg of silicate. Interestingly, the manganese silicate core confined in silica nanoshell transform into porous structured core composed of Mn2O3 phase segregated from the silicate by subsequent annealing under the oxidative condition. We can obtain the porous Mn2O3 nanoparticles after removing the silica. In this study, we not only report our finding and understanding for this transformation, but also provide the insight into the conversion mechanism in solid-state reaction which could offer the novel pathway to synthesize complex nanomaterials.
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