Synthesis of magnetite nanoparticles–β-cyclodextrin complex

In this work, the synthesis and characterization of a magnetite (M) and β-cyclodextrin (CD) complex is presented. The chemical bonding between the magnetite and CD was studied as evidence of host–guest interaction; therefore the CD works like a reactor with the magnetite inside of it, as consequence the growth of the particle is restricted by the electrostatic interaction of M–CD complex. The particle size of the magnetite–cyclodextrin complex (M–CD) decreased 79.1% with 0.5% of CD. The average particle size of the M–CD complex was 10 nm. The saturation magnetization (σs) and intrinsic coercivity (Hc) increased 10% and 20%, respectively.In order to understand how the the CD affects the results obtained, the second derivate of remission function was obtained from the ultraviolet-visible spectra (UV-vis). Fourier transform infrared spectroscopy (FTIR) was used to elucidate the interaction between the magnetite and CD. The thermal analysis was measured by thermogravimetric and differential thermal analysis (TGA–DTA). The magnetic properties, intrinsic coercivity (Hc) and the saturation magnetization were determined by vibrating sample magnetometry (VSM); the size and shape of nanoparticles were determined by scanning electron microscopy (SEM). The identification of phases was made by X-ray diffraction.