Photothermal Effect of Superparamagnetic Fe₃O₄ Nanoparticles Irradiated by Near-Infrared Laser

Figure 2

(a) Magnetic hysteresis loop and (b) left-hand-side photograph of Fe₃O₄ NPs suspended in water under daylight. Right-hand-side photograph shows a magnet in contact with the wall of the vial. The solution became clear because all Fe₃O₄ NPs were attracted by the magnet and separated from the water.

(a)

(b)