Recently, the incorporation of magnetic nanoparticles in nanomaterials has been showning to be very efficient, which leads to several scientific studies being carried out. Magnetic silica nanoparticles have excellent properties, enabling application in different fields including nanoscience. In this context, this work aimed to synthesize and characterize nanosilica with magnetic properties, in order to evaluate of the cytotoxicity in L929 cell line. The methodology for incorporation of magnetic nanoparticles proved to be fast and effective for obtaining the magnetic nanosilica (Nano SiO 2 .Fe 3 O 4). Through the characterization of FTIR, and exposure of the magnetic field it was possible to verify the incorporation of ferrite in the nanosilica, as well as the XRD technique, the reduction of the particle size and the degree of crystallinity was evidenced. It was possible to verify that the synthesized nano SiO 2 .Fe 3 O 4 showed to be safe in the treatments with lower concentrations with less amount of incoporated ferrite. Nevertheless, more characterizations and studies will be developed to determine the safety and therapeutic efficacy of this magnetic nanoparticles.

The exceptional properties of graphite, such as excellent thermal and electrical conductivity, corrosion resistance, allow this material to be widely explored in the industrial sector as an anatomic component in different material applications for instance lithium batteries. Magnetic nanoparticles, such as magnetite, presented biocompatibility, biodegradability, thermal conductivity, chemical stability, and the possibility of formation of nanocomposites. Thus, this work proposed the magnetization of graphite through a co-precipitation method that employs FeCl 2 as an iron source. This methodology proved a magnetics nanocomposite with different amounts of magnetite incorporated and control of that. The results obtained through the instrumental analysis of XRD demonstrate a high crystallinity of the material and the presence of magnetite on the surface of the graphite. The average crystallite size, updated by the Scherrer equation, shows a decrease of the size as more nanoparticles are incorporated into the nanomaterial. Finally, it is possible to confirm the obtainment of a magnetic nanocomposite using a fast, economical and efficient method.

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