Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Dispersion Property of Al2O3 Nanosol Prepared by Various Dispersion Factors and Silane Modification under Non-Aqueous Solvent

비수계 용매하에서 다양한 분산인자 및 실란 표면개질에 의해 제조된 Al2O3 나노졸의 분산 특성

  • Na, Ho Seong (Eco-Composite Materials Center, Energy Environment Material Division, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Park, Min-Gyeong (Eco-Composite Materials Center, Energy Environment Material Division, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Lim, Hyung Mi (Eco-Composite Materials Center, Energy Environment Material Division, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Kim, Dae Sung (Eco-Composite Materials Center, Energy Environment Material Division, Korea Institute of Ceramic Engineering & Technology (KICET))
  • 나호성 (한국세라믹기술원 에너지환경소재본부 에코복합소재센터) ;
  • 박민경 (한국세라믹기술원 에너지환경소재본부 에코복합소재센터) ;
  • 임형미 (한국세라믹기술원 에너지환경소재본부 에코복합소재센터) ;
  • 김대성 (한국세라믹기술원 에너지환경소재본부 에코복합소재센터)
  • Received : 2016.11.04
  • Accepted : 2016.11.14
  • Published : 2016.12.27
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Abstract

$Al_2O_3$ nanosol dispersed under ethanol or N-Methyl-2-pyrrolidone(NMP) was studied and optimized with various dispersion factors and by utilizing the silane modification method. The two kinds of $Al_2O_3$ powders used were prepared by thermal decomposition method from aluminum ammonium sulfate$(AlNH_4(SO_4)_2)$ while controlling the calcination temperature. $Al_2O_3$ sol was prepared under ethanol solvent by using a batch-type bead mill. The dispersion properties of the $Al_2O_3$ sol have a close relationship to the dispersion factors such as the pH, the amount of acid additive(nitric acid, acetic acid), the milling time, and the size and combination of zirconia beads. Especially, $Al_2O_3$ sol added 4 wt% acetic acid was found to maintain the dispersion stability while its solid concentration increased to 15 wt%, this stability maintenance was the result of the electrostatic and steric repulsion of acetic acid molecules adsorbed on the surface of the $Al_2O_3$ particles. In order to observe the dispersion property of $Al_2O_3$ sol under NMP solvent, $Al_2O_3$ sol dispersed under ethanol solvent was modified and solvent-exchanged with N-Phenyl-(3-aminopropyl)trimethoxy silane(APTMS) through a binary solvent system. Characterization of the $Al_2O_3$ powder and the nanosol was observed by XRD, SEM, ICP, FT-IR, TGA, Particles size analysis, etc.

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References

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