서지주요정보
분무열분해법에서 복합염이 금속산화물 형샹에 미치는 영향 = The effect of mixed salts on the morphology of metal oxide in spray pyrolysis
서명 / 저자 분무열분해법에서 복합염이 금속산화물 형샹에 미치는 영향 = The effect of mixed salts on the morphology of metal oxide in spray pyrolysis / 송은경.
저자명 송은경 ; Song, Eun-Kyoung
발행사항 [대전 : 한국과학기술원, 2005].
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소장정보

등록번호

8016162

소장위치/청구기호

학술문화관(문화관) 보존서고

MCBE 05011

SMS전송

도서상태

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초록정보

The requirements of the advanced metal oxide materials in terms of purity, homogeneity, strength, chemical resistance and electrical properties have been brought up and defined through the research of the last decade. The clear relationship between the initial metal oxide powder properties and the properties of the final bulk material has led to a great deal of research on the possible improvement of powder properties such as size, size distribution, homogeneity and chemical composition. Spray pyrolysis (SP) is one of the methods to contribute to the advancement of this improvement. The major premises of SP are that the precursors are well-mixed solution and the composition in droplet is homogeneous. It is also often reported, and generally accepted, that phase separation in droplet does not occur. So the multi-component particle is made by SP, and many researches in controlling the morphology and composition is conducted under these premises. In this work, metal oxide particles such as ZnO, CuO, NiO, $Co_3O_4$, $Y_2O_3$, $CeO_2$, and MgO were also prepared from metal acetate, nitrate and mixed salts. Different morphologies were obtained by changing the mixing ratio. As the fraction of acetate salt became larger in precursor solution, the product metal oxide particle was nanometer-sized particle because of the disintegration of primary particle. However, as the fraction of nitrate salt was increased, the product metal oxide particle became spherical and hollow particles with a rough surface in the range of micron or submicron size. Metal oxide particles prepared from mixed salts kept internal homogeneity. But the internal phase segregation occurred in only ZnO particle. This result was explained by the considerable difference of melting temperature and solubility. This phenomenon is examined by TGA and DTA. The morphologies of the MO were observed by SEM and TEM. In conclusion, the assumption that the homogeneous composition throughout the particle is in principle correct except when solubility and melting point are extremely different.

CuO, NiO $Co_3O_4$, MgO, $Y_2O_3$, $CeO_2$ 입자들은 전구체 염의 녹는점 차이가 ZnO만큼 크지 않고 혼합염의 녹는점이 대부분 acetate 와 nitrate 사이에 존재하므로 그 차이가 더 작아지기 때문에 상분리 현상이 일어나지 않으며, 이것은 분무열분해법으로 입자제조 시 일반적인 현상이다. 결국 혼합염으로 입자를 제조할 때, 염들간의 녹는점 차이가 크면 분무열분해법의 ‘액적 내의 모든 조성은 일정하며, 균일화합물이다’라는 대전제를 벗어나 상분리 현상이 일어나게 되며, 특별히 이상분리를 원하지 않는다면, 녹는점이 유사한 염을 전구체로 선택하는 것이 좋다.

서지기타정보

서지기타정보
청구기호 {MCBE 05011
형태사항 ix, 101 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Eun-Kyoung Song
지도교수의 한글표기 : 박승빈
지도교수의 영문표기 : Seung-Bin Park
학위논문 학위논문(석사) - 한국과학기술원 : 생명화학공학과,
서지주기 참고문헌 : p. 87-90
주제 복합염
분무열분해법
금속산화물
Mixed salt
spray pyrolysis
metal oxide
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