Figure 2.

(a) TEM micrograph of 8.5 nm iron oxide nanoparticles showing polydispersity, with an average core size of about 8.5 nm, (b) SQUID magnetometry measurement showing a saturation magnetisation of 84.7 emu g⁻¹ at 300 K and the absence of hysteretic behaviour indicating superparamagnetism, (c) an XRD pattern of iron oxide nanoparticles (compared with a magnetite standard below) and (d) an average DLS size (by number, 15.3 ± 3.61 nm).