Figure 3
a Hysteresis induced heating of magnetic nanosphere solutions. Polymer content was varied from 10 to 0.1 wt%, resulting in nanomagnet concentration from 3.5 to 0.035 mg/mL, respectively. Measured with oscillating field strength of 125 Oe and a frequency of 120 kHz, sample volume was 5 mL. b AC field modulated vitamin B12 release from the magnetic nanospheres. M t represents mass released at any time t, and M cum represents total mass released over 96 h