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Complex permittivity and microwave absorption properties of OPEFB fiber–polycaprolactone composites filled with recycled hematite (α-Fe2O3) nanoparticles


Citation

Mensah, Ebenezer Ekow and Abbas, Zulkifly and Azis, Raba'ah Syahidah and Ibrahim, Nor Azowa and Khamis, Ahmad Mamoun (2019) Complex permittivity and microwave absorption properties of OPEFB fiber–polycaprolactone composites filled with recycled hematite (α-Fe2O3) nanoparticles. Polymers, 11 (5). art. no. 918. pp. 1-11. ISSN 2073-4360

Abstract

Recycled hematite (α-Fe2O3) nanoparticles with enhanced complex permittivity properties have been incorporated as a filler in a polycaprolactone (PCL) matrix reinforced with oil palm empty fruit bunch (OPEFB) fiber for microwave absorption applications. The complex permittivity values were improved by reducing the particle sizes to the nano scale via high-energy ball milling for 12 h. A total of 5–20 wt.% recycled α-Fe2O3/OPEFB/PCL nanocomposites were examined for their complex permittivity and microwave absorption properties via the open ended coaxial (OEC) technique and the transmission/reflection line measurement using a microstrip connected to a two-port vector network analyzer. The microstructural analysis of the samples included X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and Fourier transform infrared spectroscopy (FTIR). At 1 GHz, the real (ε′) and imaginary (ε″) parts of complex permittivity of recycled α-Fe2O3 particles, respectively, increased from 7.88 to 12.75 and 0.14 to 0.40 when the particle size was reduced from 1.73 μm to 16.2 nm. A minimum reflection loss of −24.2 dB was achieved by the 20 wt.% nanocomposite at 2.4 GHz. Recycled α-Fe2O3 nanoparticles are effective fillers for microwave absorbing polymer-based composites in 1–4 GHz range applications.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.3390/polym11050918
Publisher: MDPI
Keywords: Recycled hematite; Mill scale; Mechanical alloying; Complex permittivity; Reflection loss
Depositing User: Nabilah Mustapa
Date Deposited: 04 May 2020 16:24
Last Modified: 04 May 2020 16:24
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/polym11050918
URI: http://psasir.upm.edu.my/id/eprint/38367
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