Bonding analysis of magnetic nanoparticles (MNPS) zinc ferrite (ZnFe2O4) encapsulated with silica (SIO2)

Abstract

Magnetic nanoparticles have synthesized by method ZnFe2O4 coprecipitation with mixing ZnSO4.7H2O and FeCl3.6H2O at 90 °C, stirring speed with 1000 rpm during 1 hour and NaOH as copresicipitan. FeCl3.6H2O is Ferric chloride hexahydrate or also called iron (III) chloride hexahydrate, or iron (III) chloride hexahydrate is a chemical compound in the form of solid and brownish-yellow or orange. Then encapsulated to modify the surface ZnFe2O4 with silica and considering the concentration of variation at 50%, 30%, 20%, 15%, 10%, and 5%. after while encapsulated of silica tested using X-Ray Diffraction (XRD). XRD is an analysis method used to identify the crystalline phase in the material by determining the parameters of the lattice structure and to get particle size. XRD tested resulted, indicating a change of normal spinel structure turned into Hexagonal Close-Packed (HCP). FTIR is one of the tools used to analyze chemical compounds. FTIR Test results are used for functional group analysis and identifying absorption peaks. Test analysisof functional groups using a Fourier Transformation Infra-Red Spectroscopy (FTIR) identifies peak absorption, while the characteristic functional groups of ZnFe2O4 that are M-O, Zn-Otet, Fe-Oct, and Zn-O-Fe shifting towards wavenumber more hight after encapsulated with silica due to lower vibrational energy due to absorption by the silica.