SYNTHESIS AND CHARACTERIZATION OF MAGNETIC FILMS BASED ON MAGNETITE NANOPARTICLES IN A KAPPA-CARRAGEENAN BIOPOLYMER MATRIX
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...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/86958 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | 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.
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