화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.25, 99-104, May, 2015
DOI10.1016/j.jiec.2014.10.018  Export Citation
Phase-dependent thermophysical properties of α-and γ-Al2O3 in aqueous suspension
Bhupender Pal, Soumya Suddha Mallick1, and Bonamali Pal2, †
  • Thapar University, Patiala 147004 Punjab, India
  • 1Department of Mechanical Engineering, Thapar University, Patiala, Punjab, India
  • 2School of Chemistry and Biochemistry, Thapar University, Patiala 147 004, Punjab, India
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This study demonstrates the thermal conductivity (TC) and viscosity of as prepared crystalline α-Al2O3 and amorphous γ-Al2O3 particles, having size in the range of 30?50 nm. The α and γ-Al2O3 aqueous suspension exhibited ∼10% and 6% enhancement in TC than de-ionized water, but α-Al2O3 showed (∼4?6%) higher TC than γ-Al2O3 aqueous suspension due to more crystallinity of α phase than γ phase. Ultrasonication helps in the breakdown of large clusters which further improves the dispersion stability and TC as verified by dynamic light scattering and zeta potential measurements. The Al2O3 aqueous suspension showed Newtonian characteristics at lower concentration.
Keywords:Alumina phase transition;Zeta potential of Al2O3 suspension;Thermal conductivity;Viscosity of water-Al2O3 dispersion
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