Figure 7From: Coating of magnetite with mercapto modified rice hull ash silica in a one-pot process VSM hystheresis curve of magnetite materials; (a) u-Fe 3 O 4 , (b) Fe 3 O 4 -SH, (c) Fe 3 O 4 -SiO 2 , and (d) Fe 3 O 4 -SiO 2 -SH(50:50). Back to article page