UPM Institutional Repository

Enhancement of complex permittivity and attenuation properties of recycled hematite (α-Fe2O3) using nanoparticles prepared via ball milling technique


Citation

Mensah, Ebenezer Ekow and Abbas, Zulkifly and Azis, Raba'ah Syahidah and Khamis, Ahmad Mamoun (2019) Enhancement of complex permittivity and attenuation properties of recycled hematite (α-Fe2O3) using nanoparticles prepared via ball milling technique. Materials, 12 (10). art. no. 1696. pp. 1-12. ISSN 1996-1944

Abstract

The purpose of this study was to synthesize high-quality recycled α-Fe2O3 to improve its complex permittivity properties by reducing the particles to nanosize through high energy ball milling. Complex permittivity and permeability characterizations of the particles were performed using open-ended coaxial and rectangular waveguide techniques and a vector network analyzer. The attenuation characteristics of the particles were analyzed with finite element method (FEM) simulations of the transmission coefficients and electric field distributions using microstrip model geometry. All measurements and simulations were conducted in the 8–12 GHz range. The average nanoparticle sizes obtained after 8, 10 and 12 h of milling were 21.5, 18, and 16.2 nm, respectively, from an initial particle size of 1.73 µm. The real and imaginary parts of permittivity increased with reduced particle size and reached maximum values of 12.111 and 0.467 at 8 GHz, from initial values of 7.617 and 0.175, respectively, when the particle sizes were reduced from 1.73 µm to 16.2 nm. Complex permeability increased with reduced particle size while the enhanced absorption properties exhibited by the nanoparticles in the simulations confirmed their ability to attenuate microwaves in the X-band frequency range.


Download File

[img] Text
38364.pdf
Restricted to Repository staff only

Download (4MB)

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.3390/ma12101696
Publisher: MDPI
Keywords: Recycled hematite (α-Fe2O3); Ball milling technique; Reduced particle size; Finite element method; Attenuation; Complex permittivity; X-band
Depositing User: Nabilah Mustapa
Date Deposited: 04 May 2020 16:23
Last Modified: 04 May 2020 16:23
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/ma12101696
URI: http://psasir.upm.edu.my/id/eprint/38364
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item