Assessment of the Functionalization of Chitosan/ Iron Oxide Nanoparticles
Unknown authors
Abstract
A composite of chitosan and chitosan with Fe3O4 (5, 10, 15 and 20 wt%) is casted forming film. At room temperature, prepared samples were analyzed with ATR-FTIR spectroscopy, X-ray diffraction (XRD), and a vibrating sample magnetometer (VSM). Then, antimicrobial activity against different microorganisms was evaluated. ATR-FTIR results showed that the bands for chitosan/Fe3O4 at 3250 cm-1 of the O-H band become broader compared to pure chitosan. Fe3O4 shows bands at 3195 cm-1 and 1628 cm-1 related to O-H stretching and bending. Magnetite Fe3O4 has two strong infrared absorption bands at 547 cm-1 and 435 cm-1. X-ray diffraction results confirmed the reaction and showed that a 10% weight percentage is the most reactive ratio consistent with FTIR results. The crystallinity index and crystallite size increase with increasing the concentration of magnetite, indicating that the samples prefer the amorphous form at the low concentrations of Fe3O4, and they rearrange towards the crystalline state due to the presence of magnetite. Magnetic measurements showed that both saturation magnetizations (Ms) and remanent magnetizations (Mr) increase while the coercive field (Hc) first decreases and then increases as the Fe3O4 concentration increases in the prepared nanocomposites. From antimicrobial activity against different microorganisms results, chitosan/Fe3O4 with different weight percentages of Fe3O4 showed strong antibacterial activity against bacterial species.