Figure 1.

Transmission electron microscopy images of the magnetic nanoparticles. (A) Particle cores measured to be 11.3 ± 2.3 nm (scale bar = 100 nm). (B) High-resolution lattice image of a 9.9 nm particle showing its crystalline core (scale bar = 5 nm). (C) Electron diffraction pattern, identifying cores as Fe₃O₄ (scale bar = 10 nm⁻¹).