Figure 4

N₂ adsorption-desorption isotherms (a) and pore-size distribution curves (b) for Fe₃O₄@mTiO₂ and B-Fe₃O₄@mTiO₂. (c) Room-temperature magnetization curves of Fe₃O₄ (black line) and B-Fe₃O₄@mTiO₂ (red line). Inset shows magnetic response of B-Fe₃O₄@mTiO₂ to a magnet.