Title of article :
De-agglomeration of hydrophobic and hydrophilic silica nano-powders in a high shear mixer
Author/Authors :
Ding، نويسنده , , P. and Orwa، نويسنده , , M.G. and Pacek، نويسنده , , A.W.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
6
From page :
221
To page :
226
Abstract :
The effect of energy density, pH and solid concentration on kinetics of de-agglomeration of hydrophobic silica nano-powder in a high shear mixer and on the rheology of resulting suspensions was investigated and compared with de-agglomeration kinetics and rheology of the suspension of hydrophilic silica nano-powder. In both types of nano-powders large aggregates were broken by fracture and erosion. In hydrophobic nano-powder erosion was more pronounced whilst in hydrophilic nano-powder erosion followed initial fracture of large aggregates. At sufficiently high energy input both hydrophobic and hydrophilic aggregates were broken into nano-aggregates but, even at the highest energy input, those nano-aggregates could not have been broken into single nano-particles. Rheology of the suspensions of hydrophobic nano-aggregates strongly depends on pH and on solid concentration whilst rheology of suspensions of hydrophilic nano-powder is rather weakly dependent on those parameters.
Keywords :
PH , rheology , Hydrophobic and hydrophilic silica nano-powders , De-agglomeration , Energy density
Journal title :
Powder Technology
Serial Year :
2009
Journal title :
Powder Technology
Record number :
1699042
Link To Document :
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