Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Fe3O4


The Structural and Optical Properties of Nanocrystalline Fe3O4 Thin Films Prepared by PLD

Khalid A. Abdulkareem; Suad Kadhim; Shams B. Ali

Engineering and Technology Journal, 2022, Volume 40, Issue 2, Pages 334-342
DOI: 10.30684/etj.v40i2.2235

In this study, thin films of pure iron oxide (Fe3O4) were prepared using pulsed
laser deposition technique under vacuum (2×10-3 mbar) using Nd: YAG laser at
different laser energies (700, 800, 900, and 1000 mJ) on quartz slides at the
substrate temperature of 200 °C with different thickness (170,190, 220, and 250
nm). The prepared thin films were examined using different techniques. The Xray diffraction showed a polycrystalline structure of cubic Fe3O4 phase, enhanced
its crystallinity, and increased the crystalline size when increasing the laser energy
to 1000 mJ. The results revealed that high transparency samples decreased pulse
laser energy. As the laser pulse power increases, the transparency decreases from
91% to 61%, where optical properties deteriorate significantly. The bandgap
values were detected to be 3.9 eV, 3.75 eV, 3.21 eV, and 3 eV when the laser
energies were increased with thickness (170– 250) nm. In addition, the extinction
coefficient, dielectric constants, optical constants, and refractive constants were
studied


Investigating The Effect of Magnetite (Fe3O4) Nanoparticles on Mechanical Properties of Epoxy Resin

Ehab Kaadhm; Khansaa D. Salman; Ahameed Hameed Raja

Engineering and Technology Journal, 2021, Volume 39, Issue 6, Pages 986-995
DOI: 10.30684/etj.v39i6.2063

In this paper, study the effects of magnetite nanomaterial Fe3O4 on the mechanical properties of epoxy. Dispersion of Fe3O4 nanoparticles in the epoxy resin was performed by ultrasonication. The samples of the nanocomposites were prepared using the casting method. The nanocomposites contain epoxy resins as a matrix material incorporated by different weight percentages of magnetite Fe3O4 that varies from 0wt.% to 15wt.% as a reinforcing material. The epoxy with the additive reinforcement materials Fe3O4 was slowly mixed in a sonication bath for 15 minutes, then the mixture poured into silicon molds. Field Emission Scanning Electron Microscopy FESEM and X-ray diffraction spectra XRD were used to characterize the morphological and structural properties of preparing samples and the distribution of Fe3O4 nanoparticles to the epoxy resin. Mechanical testing consists of tensile, hardness shore, and three-point flexural tests were performed on the samples at room temperature according to ASTM standards. The results showed that reinforcement by 15wt.% of Fe3O4 nanoparticles maximizes these mechanical properties of nanocomposites compared with pure epoxy except for the young modulus's preferred weight at 9 wt.%, this is due to aggregation of the additives nanomaterials in epoxy resin above 9 wt.%.