Table 3.

Examples of different types of IONPs.

Type of IONPs	Synthesis Method	Physicochemical Properties	Magnetometric Properties	Reference
Fe3O4	Thermal decomposition of iron oleate in NaCl	Octapodes; 20–30 nm	Ms = 51–71 emu∙g−1 Tb = 240–290 K (SQUID)	[72]
Fe3O4	Liquid precipitation + controlled crystal growth	Crystallite Cube; 10–300 nm	Ms = 54.7–84.7 emu∙g−1 Dc = 76 nm (SQUID)	[78]
Fe3O4 in SiO2 matrix	Co-precipitation + Stober modification	Cubic inverse spinel structure; 6–17 nm	Ms = 0.001–0.0015 emu Hc = 24–26 Oe (SQUID)	[79]
Fe3O4	Thermal decomposition of iron oleate	Cuboid shape; 7–11 nm	Ms 5 K = 11.96 emu∙g−1 Ms 310 K = 11.01 emu∙g−1 Tb = 181 K Hc = 375 Oe (5 K) (VSM)	[84]
FemOn	Precipitation method	Spherical shape; 28.8–68.1 nm	Ms = 43.8 emu∙g−1 (VSM)	[85]
FemOn-SiO2	Co-precipitation	Irregular nanoflakes; 98–101 nm	Ms = 11 emu∙g−1 (VSM)	[82]
SiO2-FemOn	Co-precipitation	Core-shell structure; 98–101 nm	Ms = 37.2 emu∙g−1 (VSM)	[82]

M_s = saturation magnetization; T_b = blocking temperature; D_c = critical size; and H_c = coercivity field.