한국분말재료학회지 (Journal of Powder Materials)

  • 제23권4호
  • /
  • Pages.311-316
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  • 2016
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  • 2799-8525(pISSN)
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  • 2799-8681(eISSN)
한국분말재료학회 (*구 분말야금학회) (The Korean Powder Metallurgy & Materials Institute)
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마이크로 주입장치를 이용한 용매치환결정화에 의한 중공상 수산화니켈 분말의 제조

Preparation of Ni(OH)2 Hollow Spheres by Solvent Displacement Crystallization Using Micro-Injection Device

  • 김세기 (한국세라믹기술원 이천분원 엔지니어링세라믹팀) ;
  • 박경수 ((주)비츠로셀 연구소) ;
  • 정광일 ((주)비츠로셀 연구소)
  • 투고 : 2016.08.01
  • 심사 : 2016.08.09
  • 발행 : 2016.08.28
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초록

$Ni(OH)_2$ hollow spheres have been prepared by solvent displacement crystallization using a micro-injection device, and the effect of process parameters such as concentration and the relative ratio of the injection speed of the precursor solution, which is an aqueous solution of $NiSO_4{\cdot}6H_2O$, to isopropyl alcohol of displacement solvent have been investigated. The crystal phases after NaOH treatment are in the ${\beta}-phase$ for all process parameters. A higher concentration of $NiSO_4{\cdot}6H_2O$ aqueous solution is injected by a micro-injection device and bigger $Ni(OH)_2$ hollow spheres with a narrower particle size distribution are formed. The crystallinity and hardness of the as-obtained powder are so poor that hydrothermal treatment of the as-obtained $Ni(OH)_2$ at $120^{\circ}C$ for 24 h in distilled water is performed in order to greatly improve the crystallinity. It is thought that a relative ratio of the injection speed of $NiSO_4{\cdot}6H_2O$ to that of isopropyl alcohol of at least more than 1 is preferable to synthesize Ni(OH)2 hollow spheres. It is confirmed that this solution-based process is very effective in synthesizing ceramic hollow spheres by simple adjustment of the process parameters such as the concentration and the injection speed.

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