Sonochemical magnetite encapsulation in silica at low irradiation power

Magnetite nanoparticles (Fe3O4 NPs) coated with silicon dioxide (SiO2) defined as Fe3O4@SiO2 core-shells are a viable option for the development of addressable and multifunctional nanotargets; because of their superparamagnetic properties, molecular/biological anchor and biocompatibility in nanomedicine and theragnostics. In this work, we report Fe3O4@SiO2 obtained by Stöber and sonochemical methods combination at low irradiation power (130 W, 1 h) with different volumes of tetraethylorthosilicate (TEOS). Fe3O4@SiO2 results showed effects of diamagnetic silanol (Si-OH) layer as function of concentration over magnetic behavior.