Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Fabrication of Nano-sized ZnO Colloids from Spray Combustion Synthesis (SCS)

분무연소합성(SCS)법에 의한 나노크기 산화아연(ZnO) 콜로이드의 제조

  • Lee, Sang-Jin (Division of Advanced Materials Engineering, Kyungnam University) ;
  • Lee, Sang-Won (Division of Advanced Materials Engineering, Kyungnam University) ;
  • Jun, Byung-Sei (Division of Advanced Materials Engineering, Kyungnam University)
  • 이상진 (경남대학교 신소재공학부) ;
  • 이상원 (경남대학교 신소재공학부) ;
  • 전병세 (경남대학교 신소재공학부)
  • Published : 2004.01.01
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Abstract

Nano-sized ZnO colloids were prepared by use of spray combustion method. for combustion reaction, $Zn(NO_3)_2{\cdot}6H_2O$ and $CH_6N_4O$ were employed as an oxidizer and a fuel. Exothermic peak was shown at $230^{\circ}C$ by DTA/TGA, and it was considered as a combustion reaction followed by ignition of the precursor mixture. In case of spray combustion method, because insufficient contents of molecules and radicals generated from precursor droplets may lead an incomplete igmition, the ignition temperature of combustion chamber was chosen at $500^{\circ}C$. For diminishing aerosol coagulation, the droplet number concentration was reduced by filter media. The fluid was laminar with 2.5 seconds of aerosol residence time. The synthesized colloids had spherical shape with 180 nanometer size, and the crystalline phase was ZnO with hexagonal structure.

분무연소합성법을 이용하여 나노 크기의 산화아연(ZnO) 콜로이드를 제조하였다. 연소반응을 위한 산화제로서 $Zn(NO_3)_2{\cdot}6H_2O$와 환원제(연료)로서 $CH_6N_4O$를 사용하였다. DTA/TGA를 이용하여 열분석을 행한 결과 $230^{\circ}C$에서 전구체 혼합물의 착화(ignition)에 의한 연소반응으로 생각되는 발열피크가 나타났다. 그러나 분무 연소 반응의 경우 ${\mu}m$ 크기의 액적들로 인해 착화를위한 분자 또는 기들의 함량이 상대적으로 적기 때문에 분무된 액적들의 착화를 위해 연소반응기의 온도를 $500^{\circ}C$로 유지하였다. 응집체의 형성을 억제하기 위하여 여과매체를 사용하여 액적의 개수 농도를 감소시켰으며, 에어로졸 입자의 체류시간을 2.5초로 조절하여 열 유체의 흐름을 층류로 유도하였다. 제조된 입자들의 모양은 모두 구형이었으며, 평균 입자 크기는 180nm이었다. XRD와 TEM 분석 결과 각각의 콜로이드들은 ZnO 고유의 결정성을 나타내고 있었으며, hexagonal 구조를 가지는 것으로 확인되었다.

Keywords

References

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