SYNTHESIS AND CHARACTERIZATION OF MAGNETIC FILMS BASED ON MAGNETITE NANOPARTICLES IN A KAPPA-CARRAGEENAN BIOPOLYMER MATRIX

• Main Author: Artha Febriyanti Turnip, Maria
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86958
• Institution: Institut Teknologi Bandung

Magnetic films were produced by solution casting using kappa-carrageenan as the matrix, glycerol as the plasticizer, and trisodium citrate-modified Fe3O4 nanoparticles (Fe3O4 NP-TS) as magnetic material. The Fe3O4 NPs were synthesized by co-precipitation using iron sand and ammonium hydroxide as precursors. TEM images showed that the Fe3O4 NP were spherical and formed agglomerates. However, after modification with trisodium citrate, the nanoparticles became more monodisperse while retaining their spherical shape. The XRD pattern of the magnetic film matched the XRD patterns of both the kappacarrageenan/glycerol (KG) film and the Fe3O4NP-TS. SEM images of the magnetic film sample confirmed the presence of agglomerated Fe3O4NP-TS dispersed in the KG matrix. The surface of the magnetic film was rough due to uneven dispersion of the Fe3O4 NP-TS. Magnetic characterization by VSM measurements showed that the magnetic film exhibited soft-ferromagnetic behavior. The addition of Fe3O4NPTS increased the saturation magnetization but decreased the coercivity. Initial optical characterization of the magnetic film by UV-Vis spectroscopy showed that the film absorbed more UV light than visible light due to the presence of Fe3O4 NPs. More UV light was reflected than absorbed by the magnetic film, suggesting its potential use as UV protection. Electrical characterization of the magnetic film by LCR spectroscopy showed a decrease in resistance compared to the matrix. Increasing the amount of Fe3O4 NP-TS further decreased the resistance. Measurements using a fabricated setup showed that an applied electric field tended to be dissipated rather than stored.