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KMID : 0381920040340010023
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Korean Journal of Microscopy
2004 Volume.34 No. 1 p.23 ~ p.29
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Structural Analysis & Phase Transition of Amorphous Silica Nanoparticles Using Energy-Filtering TEM
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Park Jong-Il
Kim Jin-Gyu
Song Ji-Ho
Kim Youn-Joong
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Abstract
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In this study, we introduce the structural analysis of amorphous silica nanoparticles by EF-TEM electron diffraction and in-situ heating experiments. Three diffused rings were observed on the electron diffraction patterns of initial silica nanoparticles, while crystalline spot patterns were gradually appeared during the insitu heating process at 90℃. These patterns indicate the basic unit of SiO4 tetrahedra consisting amorphous silica and gradual crystallization into the ideal layer structure of tridymite by heating. Under high vacuum condition in TEM, SiO nanoparticles were redeposited on the carbon grid after evaporation of SiO gas from SiO2 above 850℃ and the remaining SiO2 were crystallized into orthorhombic tridymite, consistent with ex-situ heating results in furnace at 900℃.
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KEYWORD
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Amorphous silica nanoparticles , EF-TEM , In-situ heating , SiO2 , tridymite ,
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