Figure 5From: Coating of magnetite with mercapto modified rice hull ash silica in a one-pot process TEM image of magnetite materials; (a) u-Fe 3 O 4 , (b) Fe 3 O 4 -SiO 2 , (c) Fe 3 O 4 -SiO 2 -SH(50:50), and (d) Fe 3 O 4 -SH. Back to article page