문화기술의 융합 (The Journal of the Convergence on Culture Technology)

  • 제9권3호
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  • Pages.587-592
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  • 2023
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  • 2384-0358(pISSN)
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  • 2384-0366(eISSN)
국제문화기술진흥원 (The International Promotion Agency of Culture Technology)
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Cobalt(II) chloride hexahydrate와 결정성 셀룰로오스를 출발물질로 사용한 산화코발트(Co3O4·CoO) 초미세입자의 합성

Preparation of cobalt oxide(Co3O4·CoO) ultra fine particles using cobalt(II) chloride hexahydrate and crystalline cellulose as a starting materials

  • 김수종 (한라대학교 신소재화학공학과)
  • Soo-Jong Kim (Dept. of Advanced Materials & Chemical Engineering, Halla University)
  • 투고 : 2023.05.01
  • 심사 : 2023.05.15
  • 발행 : 2023.05.31
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초록

CoCl2·6H2O 수용액을 결정성셀룰로오스에 함침시켜 건조한 후, 하소, 소성을 통하여 산화코발트(Co3O4·CoO) 초미세입자를 합성하였다. 합성된 코발트 산화물 입자의 결정구조 및 표면구조를 주사전자현미경(SEM)과 X-선회절분석(XRD)으로 조사하였다. CoCl2·6H2O 수용액을 함침시키는 매개체로 사용한 결정성셀룰로오스(crystalline cellulose)는 470℃ 정도에서 열분해 되었고, Co3O4 결정상은 350℃에서 생성되기 시작하였다. Co3O4 결정상은 500℃까지 유지되었으며, 500℃ 이상의 온도에서는 CoO 결정상으로 변화하는 것을 알 수 있었다. 열처리 온도가 증가함에 따라 산화코발트 입자의 크기가 커지는 현상이 나타났으며, 900℃ 이상의 온도에서는 입자간 용융이 일어나는 것이 관찰되었다. 하소온도 700℃ 이하의 온도에서 입자크기 2-10㎛의 Co3O4와 CoO의 초미세입자가 생성되는 것을 확인하였다.

Cobalt oxide (Co3O4·CoO) ultra fine particles were synthesized by liquid phase precursor method. cobalt(II) chloride hexahydrate (CoCl2·6H2O) was as a starting material. A plant-derived crystalline cellulose was used as impregnating materials. A impregnated precursor was calcined at a temperature of 350 to 900℃ to obtain cobalt oxide particles having a particle size of 1 to 10㎛. The crystallization process and morphology according to the calcination temperature were examined, and the properties of the synthesized powder were evaluated using SEM and XRD. It was confirmed that a crystal phase of Co3O4 began to form around 350℃ and crystal growth occurred up to 900℃. At a temperature above 500℃, the Co3O4 crystal was changed to another crystal phase CoO.

키워드

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