Figure 6. (a) TEM image of 10% - HMOCs - 2.5 ml - Fe₃O₄ NPs;(b) 300 K magnetization isotherms of 10% - HMOCs - 2.5 ml - Fe₃O₄ NPs, (red line) 10% - HMOCs - 2.5 ml - Fe₃O₄ NPs after soaked in PBS for 48 h (blue line) and 10% - HMOCs - 2.5 ml - Fe₃O₄ NPs loaded with drug (green line).