Preparation of surface coated nano particles by spray pyrolysis = 분무열분해법으로 코팅된 나노입자 제조

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The surface of particle can be tailored to get specific physical, optical, electronic, chemical, and biomedical properties by coating a thin film of material on the surface of the particles while the core particle is given new functions maintaining its fundamental physical properties. In order to prepare the magnetically separable photocatalyst, $TiO_2/SiO_2$ coated $NiFe_2O_4$ was prepared by a continuous multi-step spray pyrolysis process. This new type photocatalyst combined the magnetic property of core part and catalytic property of shell part of particle. Submicron size $NiFe_2O_4$ particle was prepared by ultrasonic spray pyrolysis and titania nano particle was coated continuously. There are no impurities between coated titania layer and core material, $NiFe_2O_4$ under the high reaction temperatures. Prepared photocatalyst showed good photoactivity compared with commercial photocatalyst ($Degussa^\textregistered P-25$) and titania and silica double layer coated $NiFe_2O_4$ particle had more enhanced photoactivity. To give the hydrophobicity on bare silica surface, fumed silica surface was modified with Octhytriethoxysilane (OTES). From the coating process, surface property of silica powder was easily changed. We investigated an aerosol spray reactor method for modifying the hydrophobicity of silica particle. The aerosol spray reactor method has all the advantages of liquid-phase process, while it produces agglomeration-free particle at lower operating cost than the gas-phase process. Hydrophobicity of the modified particles was compared with the silica particle modified by liquid-phase process and gas-phase process. Hydrophobicity of commercial silica ($Aerosil^\textregistered R812, Degussa$) was also measured as a reference. In order to non-oxide coating on ceramic powder, lithium-salt was coated on fumed silica surface and its electrical property was measured. Lithium-salt-coated silica was used as new type lithium rechargeable polymer elect...
Advisors
Park, Seung-Binresearcher박승빈researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
237616/325007  / 000995340
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2004.2, [ ix, 108 p. ]

Keywords

HYDROPHOBICITY; PHOTOCATALYST; SPRAY PYROLYSIS; COATED NANO PARTICLE; HOLLOW PARTICLE; 중공입자; 소수성; 광촉매; 분무열분해법; 나노입자 코팅

URI
http://hdl.handle.net/10203/28924
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=237616&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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