Reduction of Electromagnetic Interference Using ZnO-PCL Nanocomposites at Microwave Frequency

Yakubu, Abubakar; Abbas, Zulkifly; Ibrahim, Nor Azowa; Fahad, Ahmad

doi:10.1155/2015/132509

Cited by 9 publications

(3 citation statements)

References 17 publications

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“…This behaviour might be attributed to the compact and dense nature of the nano filler [7]. The decrease in dielectric constant as frequency increases can be attributed to the permittivity dispersion which is interfacial polarization [8]. The high permittivity observed at the lower frequency range is due to heterogeneous conduction in the multiphase of the composites [9].…”

Section: Dielectric Characterizationmentioning

confidence: 99%

Enhancing the Permittivity, Permeability and Morphology of Zno-PCL Nanocomposites via Nano Inclusion Treatment

Yakubu

Abba

Sahabi³

2019

Global J. Polym. Sci.

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This study involves an investigation to ascertain the effect of ZnO nano inclusion on the evolution and dielectric properties of ZnO-PCL nanocomposites. The effect of the nano inclusion towards attenuation of the composites is also reported. In this study, ZnO nano particles and polycaprolactone (PCL) were blended to form composites using melt blending technique. The composites were employed to study the effect of nano inclusion on the materials. Further analysis was done using FTIR to investigate the band positions and absorption peak of the prepared samples, SEM and EDX for the morphology and elemental composition of samples. The FTIR spectra indicated a strong interaction at the interface of the ZnO nano particles with the polymer matrix. Amongst other findings, it was confirmed that the dielectric constant increases as the ZnO nano content increases where the average values for the different compositions are 4.39, 4.14, 3.62, 3.31 and 3.21 from highest to lowest filler percentage respectively. The high dielectric properties of the composites makes it suitable for small microwave absorption devices

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Section: Dielectric Characterizationmentioning

confidence: 99%

Enhancing the Permittivity, Permeability and Morphology of Zno-PCL Nanocomposites via Nano Inclusion Treatment

Yakubu

Abba

Sahabi³

2019

Global J. Polym. Sci.

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“…However, the imaginary permittivity limitation can be effectively reduced by modifying the particle sizes while retaining the magnetic properties, since the microstructure and morphology of ferrites are known to influence their complex permittivity properties [ 10 ]. Recycled α-Fe 2 O 3 nanoparticles with enhanced permittivity can be reinforced with non-conducting polymer matrices such as polycaprolactone (PCL) since as a thermoplastic polymer, it can easily be melt-blended with metal oxides [ 11 , 12 ] to fabricate novel absorbers that could possess promising attenuation properties critical for electromagnetic interference (EMI) suppression and radar-signature reduction. This application can be further supported by the magnetic nature of the recycled α-Fe 2 O 3 nanoparticles coupled with their high interfacial density due to their compactness.…”

Section: Introductionmentioning

confidence: 99%

Complex permittivity and power loss characteristics of α-Fe2O3/polycaprolactone (PCL) nanocomposites: effect of recycled α-Fe2O3 nanofiller

Mensah

Abbas

Azis

et al. 2020

Heliyon

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The development of microwave absorbing materials based on recycled hematite (α-Fe 2 O 3 ) nanoparticles and polycaprolactone (PCL) was the main focus of this study. α-Fe 2 O 3 was recycled from mill scale and reduced to nanoparticles through high energy ball milling in order to improve its complex permittivity properties. Different compositions (5% wt., 10% wt., 15% wt. and 20% wt.) of the recycled α-Fe 2 O 3 nanoparticles were melt-blended with PCL using a twin screw extruder to fabricate recycled α-Fe 2 O 3 /PCL nanocomposites. The samples were characterized for their microstructural properties through X - ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The complex permittivity and microwave absorption properties were respectively measured using the open ended coaxial (OEC) probe and a microstrip in connection with a vector network analyzer in the 1–4 GHz frequency range. An average α-Fe 2 O 3 nanoparticle size of 16.2 nm was obtained with a maximum imaginary (ε " ) part of permittivity value of 0.54 at 4 GHz. The complex permittivity and power loss values of the nanocomposites increased with recycled α-Fe 2 O 3 nanofiller content. At 2.4 GHz, the power loss (dB) values obtained for all the nanocomposites were between 13.3 dB and 14.4 dB and at 3.4 GHz, a maximum value of 16.37 dB was achieved for the 20 % wt. nanocomposite. The recycled α-Fe 2 O 3 /PCL nanocomposites have the potential for use in noise reduction applications in the 1–4 GHz range.

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“…Current usage of mobile telephones has plunged the industry into critical thinking of how to curb the menace of electromagnetic interference (EMI) pollution arising from the ever growing number of the telecommunication users via mobile telephones, local area networks, wide area networks and radar systems [1].…”

Section: Introductionmentioning

confidence: 99%

Easy Determination of Radiation Absorption in Brain Tissue from Mobile Phones Using Finite Element Method

Yakubu¹,

Abbas²,

Yunusa³

2019

OJBIPHY

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Brain tissue plays a significant role in both cognitive and psychomotor behavior of humans. However, their interaction with radiation emanating from hand held mobile devices is still not fully understood. This research was aimed at investigating radiation absorption in brain tissue. Bovine brain tissues ranging from lesser than 1 year to greater than 10 years of age were bought from a specialty store (Sigma-Aldrich). The tissues were used within 72 h of extraction for ex vivo brain experiments. The brain tissue was stored at 6˚C and then 16˚C for 24 h in the MRI room to reach thermal equilibrium before any experiments were undertaken. The averages for the dielectric constant were measured from 1-4 GHz using open ended coaxial probe (OECP) (85,070E; Agilent Technologies). The results obtained for the dielectric properties were then used as raw data in the numerical computation and simulation of the radiation absorption by the brain tissues for both adolescent and adults bovine brain tissue using finite element method (FEM). The measured dielectric constants varied for the different brain tissue from 54.39 to 39.29. Analysis showed that adolescents tissue absorbed more radiation than adults from mobile phoneradiation which is due to the higher dielectric property of adolescent brain tissue. The results obtained can be applied to human brain tissue since bovine shares the same compositional properties with humans.

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Reduction of Electromagnetic Interference Using ZnO-PCL Nanocomposites at Microwave Frequency

Cited by 9 publications

References 17 publications

Enhancing the Permittivity, Permeability and Morphology of Zno-PCL Nanocomposites via Nano Inclusion Treatment

Enhancing the Permittivity, Permeability and Morphology of Zno-PCL Nanocomposites via Nano Inclusion Treatment

Complex permittivity and power loss characteristics of α-Fe2O3/polycaprolactone (PCL) nanocomposites: effect of recycled α-Fe2O3 nanofiller

Easy Determination of Radiation Absorption in Brain Tissue from Mobile Phones Using Finite Element Method

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