Abstract:
The purpose of this study was to improve the dielectric, magnetic, and thermal properties of polytetrafluoroethylene (PTFE) composites using recycled Fe2O3 (rFe2O3) nanofiller. Hematite (Fe2O3 ) was recycled from mill scale waste and the particle size was reduced to 11.3 nm after 6 h of high-energy ball milling. Different compositions (5�25 wt %) of rFe2O3 nanoparticles were incorporated as a filler in the PTFE matrix through a hydraulic pressing and sintering method in order to fabricate rFe2O3�PTFE nanocomposites. The microstructure properties of rFe2O3 nanoparticles and the nanocomposites were characterized through X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). The thermal expansion coefficients (CTEs) of the PTFE matrix and nanocomposites were determined using a dilatometer apparatus. The complex permittivity and permeability were measured using rectangular waveguide connected to vector network analyzer (VNA) in the frequency range 8.2�12.4 GHz. The CTE of PTFE matrix decreased from 65.28 � 10?6/?C to 39.84 � 10?6/?C when the filler loading increased to 25 wt %. The real (?? ) and imaginary (??? ) parts of permittivity increased with the rFe2O3 loading and reached maximum values of 3.1 and 0.23 at 8 GHz when the filler loading was increased from 5 to 25 wt %. A maximum complex permeability of (1.1 ? j0.07) was also achieved by 25 wt % nanocomposite at 10 GHz. � 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Description:
Khamis, A.M., Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor, 43400, Malaysia; Abbas, Z., Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor, 43400, Malaysia, Introp, University Putra Malaysia, Serdang, Selangor, 43400, Malaysia; Azis, R.S., Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor, 43400, Malaysia, Institute of Advanced Material, University Putra Malaysia, Serdang, Selangor, 43400, Malaysia; Mensah, E.E., Faculty of Science Education, University of Education, Winneba, P.O. Box 40, Ashanti, Mampong, Ghana; Alhaji, I.A., Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor, 43400, Malaysia