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Phase-dependent thermophysical properties of a-and g-Al2O3 in aqueous suspension
Bhupender Pal,Soumya Suddha Mallick,Bonamali Pal 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
This study demonstrates the thermal conductivity (TC) and viscosity of as prepared crystalline a-Al2O3 and amorphous g-Al2O3 particles, having size in the range of 30–50 nm. The a and g-Al2O3 aqueous suspension exhibited 10% and 6% enhancement in TC than de-ionized water, but a-Al2O3 showed (4–6%) higher TC than g-Al2O3 aqueous suspension due to more crystallinity of a phase than g 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.