Characterization of Magnetic Nanoparticles from the Shells of Freshwater Mussel L. fortunei and Marine Mussel P. perna

Magnetite (Fe3O4) nanoparticles were extracted from the shells of freshwater Limnoperna fortunei (Dunker 1857) and marine Perna perna (Linnaeus 1758) mussels, followed by full physical chemical characterization using ICP-OES, UV–Vis, EDX, Raman, XRD spectroscopy, VSM magnetometry, SEM TEM techniques. Considering their spatial distribution, ferrimagnetic particles in had low concentration presented superparamagnetic behavior characteristics materials nanometric size. Transmission electron microscopy (TEM, especially HRTEM) indicated round magnetic around 100 nm size, which found to be aggregates about 5 The data no iron oxide at periostracum layer. Nevertheless, roughly (hydr)oxide nanoparticle nacre, namely, aragonite As layer is responsible for more than 97% shell L. considering estimated size nanoparticles, we infer that these may distributed homogeneously throughout shell.