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지식나눔

지식나눔

xCoO.10-xSiO2제조에서...

2003-03-13 org.kosen.entty.User@70f7d425 최영일(nanology)
  • 1
코발트니트레이트를 에탄올에 녹인후 TEOS를 넣고 HClaq를 촉매로 사용하여 코팅을 위한 졸을 제조하였습니다. 코팅후 청보라를 가진 투명한 막을 만들 수 있었습니다. 하지만 다시 같은 테스트를 해보니 같은 막을 만들수가 없었습니다. 청보라가 아닌 검정 갈색의 이상한 막이 생성되더군요. 제생각엔 코발트가 6배위에서 반응후 소성과정에서 용매와 물이 빠져나가면서 4배위로 바뀌고 주변의 실리케이트와 결합을 해야 하는것 같은데....실제로 결합이 잘 안일어나는것 같습니다. 그래서 코발트 옥사이드폼으로 남아있어서 검은색으로 나오는것 같습니다. 좋은 의견이나 제조법에대해 아시는 분은 많은 도움 부탁드립니다. 코발트가 아니더라도 금속산화물 실리케이트합성법에대한 자료도 있으신 분은 도움 부탁드립니다.
  • 졸겔
  • 코발트실리케이트
  • 반응성
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    김덕양님의 답변

    2003-03-14
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    첨부파일

    도움이 되실지 몰라서 열처리와 관련된 논문 하나를 올려드립니다. 전에도 몇번 질문하신 적이 있는데 중복된 답변인지도 모르겠군요. 아래는 Co 의 배위수 변화와 관련된 논문입니다. 필요하시다면 복사해서 보내드리겠습니다. 그럼. Journal of Sol-Gel Science and Technology 19 (1-3): 701-704, December 2000 Copyright © 2000 Kluwer Academic Publishers All rights reserved Changes in Coordination Number of Co Ion and Fluorescence Spectrum of 1-Naphthol during the Sol-Gel Reaction of TEOS Nobuaki Tanaka Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan. ntanaka@gipwc.shinshu-u.ac.jp Eri Aoki Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan Tsuneo Fujii Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan Abstract Changes in coordination number of Co2+ and fluorescence spectra of 1-naphthol during the sol-gel transitions of TEOS have been investigated as a function of time. The change in the coordination number of Co2+ has been observed as follows. Six-coordinated Co2+ decreased quickly within several hours in the first stage of the reaction corresponding to water consumption by initial hydrolysis reaction. Then six-coordinated Co2+ increased around gelation due to polycondensation. After the gelation four-coordinated Co2+ increased, where isomorphous-replacement of Co2+ into the –O–Si–O– networks occurred. In the Co2+/1-naphthol mixed system, separate ion pair of 1-naphthol is preferentially coordinated on the six-coordinated Co2+ where water molecule(s) plays an important role to geometrical relaxation of excited-state 1-naphthol. Keywords Co2+ complex, sol-gel, 1-naphthol, contact ion pair, separate ion pair Article ID: 277385
    답변수정
    도움이 되실지 몰라서 열처리와 관련된 논문 하나를 올려드립니다. 전에도 몇번 질문하신 적이 있는데 중복된 답변인지도 모르겠군요. 아래는 Co 의 배위수 변화와 관련된 논문입니다. 필요하시다면 복사해서 보내드리겠습니다. 그럼. Journal of Sol-Gel Science and Technology 19 (1-3): 701-704, December 2000 Copyright © 2000 Kluwer Academic Publishers All rights reserved Changes in Coordination Number of Co Ion and Fluorescence Spectrum of 1-Naphthol during the Sol-Gel Reaction of TEOS Nobuaki Tanaka Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan. ntanaka@gipwc.shinshu-u.ac.jp Eri Aoki Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan Tsuneo Fujii Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan Abstract Changes in coordination number of Co2+ and fluorescence spectra of 1-naphthol during the sol-gel transitions of TEOS have been investigated as a function of time. The change in the coordination number of Co2+ has been observed as follows. Six-coordinated Co2+ decreased quickly within several hours in the first stage of the reaction corresponding to water consumption by initial hydrolysis reaction. Then six-coordinated Co2+ increased around gelation due to polycondensation. After the gelation four-coordinated Co2+ increased, where isomorphous-replacement of Co2+ into the –O–Si–O– networks occurred. In the Co2+/1-naphthol mixed system, separate ion pair of 1-naphthol is preferentially coordinated on the six-coordinated Co2+ where water molecule(s) plays an important role to geometrical relaxation of excited-state 1-naphthol. Keywords Co2+ complex, sol-gel, 1-naphthol, contact ion pair, separate ion pair Article ID: 277385
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