Page 121 - Book Hosokawa Nanoparticle Technology Handbook
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2.5 PORE STRUCTURE FUNDAMENTALS
(a) (b) (c)
X X X
(d) (e)
x=100nm
X X
Figure 2.5.3
SEM images of porous particles prepared by spray-pyrolysis method. (a) SiO , (b) TiO , (c) ZrO , (d) Al O , (e) Y O .
3
2
2
2
2
2
3
High concentration of sol solution
Small droplet size
Very large silica particles size
3 μm
Solid spherical particle
Primary droplet
High carrier gas flow rate
Large droplet size
High temperature
Addition of surfactant 3 μm
Doughnut-type particle
Figure 2.5.4
Spherical and doughnut-type SiO particles prepared by spray-drying method.
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