(a)
(b)
Figure 2:
TEM micrographs of (a) Fe
3
O
4
/SiO
2
nanoparticles prepared by sonication; inset shows an individual Fe
3
O
4
/SiO
2
nanoparticles and (b) Fe
3
O
4
/SiO
2
nanoparticles prepared by the stirring method.
