Physiochemical properties and electromagnetic wave absorption performance of Ni0.5Cu0.5Fe2O4 nanoparticles at X-band frequency

Wahaab, Fatai Adisa; Adebayo, Lawal Lanre; Adekoya, Abibat Asabi; Hakeem, Ibrahim Gbolahan; Alqasem, Bilal; Obalalu, Adebowale Martins

doi:10.1016/j.jallcom.2020.155272

Cited by 47 publications

(15 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An appreciation of β decreases yield stress, thereby leading to a decrease in performance of both natural and radial speeds. An increase in the Hartmann number ( Ha ) means an increase of the transverse magnetic field, which increased the resistivity forces (Lorentz) 35 . The effect of variable viscosity (

ξ_{1}

) and squeezing ( ε ) parameters on the dimensionless normal and radial parameters were shown in Figure 2C,D.…”

Section: Validation Computational Results and Discussionmentioning

confidence: 95%

Heat and mass transfer in an unsteady squeezed Casson fluid flow with novel thermophysical properties: Analytical and numerical solution

Obalalu

2021

Heat Trans

View full text Add to dashboard Cite

This study investigates the heat and mass transfer in an unsteady squeezing flow between parallel plates under the influence of novel variable diffusivity. In most of the literature, it is believed that the thermophysical properties of the fluid are unchanged. However, this present study bridges this gap by assuming that viscosity, conductivity, and diffusivity are all temperature‐dependent. Physically, an appropriate analysis of thermophysical variables in such a system is required to achieve the best performance for effective heat and mass transfer processes. The equations controlled were first nondimensional and then simplified by a similarity transformation to ordinary nonlinear differential equations. The present study provides a fast convergent method on finite parallel plates, namely, the optimal homotopy analysis method (OHAM) and spectral collocation method (SCM) are used to analyze the fluid flow, heat, and mass transport. The graphical and table understanding is given via an error table and flow behavior of physical parameters. The result reveals that the SCM is more accurate than OHAM. However, the method employed in this paper offers excellent convergence solutions with good accuracy. The solution convergence is also discussed. In this type of problem, squeeze numbers play an important role and the rise in the squeezing parameter increases the fluid temperature.

show abstract

ξ_{1}

) and squeezing ( ε ) parameters on the dimensionless normal and radial parameters were shown in Figure 2C,D.…”

Section: Validation Computational Results and Discussionmentioning

confidence: 95%

Heat and mass transfer in an unsteady squeezed Casson fluid flow with novel thermophysical properties: Analytical and numerical solution

Obalalu

2021

Heat Trans

View full text Add to dashboard Cite

show abstract

“…In addition to this, the resonance peaks at 4.0–9.0 GHz can be ascribed to natural resonance, and that at 11.0–14.5 GHz can be ascribed to exchange resonance. Dielectric loss tangent (tanδ ϵ ) and magnetic loss tangent (tanδ μ ) are intent to assess the dielectric loss capacity and magnetic loss capacity of absorbers [53,54] . The tanδ ϵ of four samples in Figure 9 (b) are much higher than tanδ μ values (Figure 9 (c)), meaning the dielectric loss plays a primary role in dissipating EM waves.…”

Section: Resultsmentioning

confidence: 99%

“…Dielectric loss tangent (tanδ ε ) and magnetic loss tangent (tanδ μ ) are intent to assess the dielectric loss capacity and magnetic loss capacity of absorbers. [53,54] The tanδ ε of four samples in Figure 9 (b) are much higher than tanδ μ values (Figure 9 (c)), meaning the dielectric loss plays a primary role in dissipating EM waves. The LF-700 has the highest tanδ ε values at ∼ 4.5-16.0 GHz because most of the carbon matrix was not detected by magnetic particles so that the carbon matrix can provide some conductive loss.…”

Section: Complex Permittivity and Complex Permeabilitymentioning

confidence: 90%

Hierarchically Porous Carbon/α‐Fe@Fe₃C Absorbers Derived from Luffa Sponge with Efficient Microwave Absorption

Zheng

Wang

et al. 2020

ChemistrySelect

View full text Add to dashboard Cite

Biomass‐based carbon materials have attracted much attention in the field of microwave absorption because of their light weight, environmental friendliness, low cost and high efficiency. In this work, carbon matrix of porous microtubule structure with different magnetic particles was synthesized from natural luffa sponge by a simple calcination process. The carbon matrix possesses hierarchical porous structures including micrometer‐scale tubular channels, nanometer‐scale macrospores, mesopores and micropores, of which microspores are the most. The Fe3O4, FeO/α‐Fe, α‐Fe/γ‐Fe and α‐Fe/Fe3C particles were formed in the temperature range of 700–1000 °C. The porous carbon/α‐Fe@Fe3C composites obtained at 1000 °C exhibit excellent microwave absorption (MA) performance, its minimum reflection loss can reach −48.9 dB with only a thickness of 1.5 mm, and the effective absorption bandwidth (RL≤−10 dB) is 3.86 GHz. The porous structure, synergies between dielectric loss and magnetic loss, high attenuation constant are the key factors for good MA performance.

show abstract

“…A gas chromatograph/ mass spectrometry (GC-MS) analysis was performed to determine the intermediates in CIP degradation process. FT-IR is shown in Figure 3(a), the peak around 3,400 cm À1 can be attributed to the stretching vibration peak of O-H. Two main ferrite characteristic bands were detected: octahedral metal stretching inherent in the low-frequency band (415-455 cm À1 ) and tetrahedral stretching vibration in the high-frequency band (570-630 cm À1 ) (Wahaab et al 2020).…”

Section: Degradation Efficiency (100%mentioning

confidence: 99%

Insight into the performance and mechanism of magnetic Ni0.5Cu0.5Fe2O4 in activating peroxydisulfate for ciprofloxacin degradation

Wang

et al. 2022

Water Science and Technology

View full text Add to dashboard Cite

Magnetic nickel-copper ferrite (NixCuyFe2O4) nano-catalyst was synthesized by co-precipitation method, and it exhibited excellent ability for activating peroxydisulfate (PDS) in the degradation of ciprofloxacin (CIP). As-prepared Ni0.5Cu0.5Fe2O4 properties were characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope equipped with an energy-dispersive X-ray (SEM-EDX), transmissions electron microscopy (TEM), N2 adsorption-desorption isotherm plot of Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH), vibrating sample magnetometer (VSM). The maximum degradation efficiency is 80.2% by using 0.500 g/L of Ni0.5Cu0.5Fe2O4 for activating 5.00 mmol/L of PDS to degrade CIP (20.0 mg/L) at 25 ± 2 °C for 50 min (pH = 6.00). The presence of interfering ions Cl−, NO3−, and HCO3− inhibited the reaction by producing reactive species with low oxidation potential, inducing the degradation efficiency decreased down to 60.0%, 58.1% and 21.5% respectively. Ni0.5Cu0.5Fe2O4 displayed great magnetic separation characteristic for the satisfactory magnetization saturation value is ∼8.6 emu/g. The degradation efficiency of recycled samples is no significant difference after using for three times, which is about 60%, indicating that Ni0.5Cu0.5Fe2O4 is a reusability catalyst in activating PDS for CIP degradation. This work might provide an efficient and promising approach to construct recyclable magnetic materials that can be used for wastewater treatment.

show abstract

Physiochemical properties and electromagnetic wave absorption performance of Ni0.5Cu0.5Fe2O4 nanoparticles at X-band frequency

Cited by 47 publications

References 36 publications

Heat and mass transfer in an unsteady squeezed Casson fluid flow with novel thermophysical properties: Analytical and numerical solution

Heat and mass transfer in an unsteady squeezed Casson fluid flow with novel thermophysical properties: Analytical and numerical solution

Hierarchically Porous Carbon/α‐Fe@Fe₃C Absorbers Derived from Luffa Sponge with Efficient Microwave Absorption

Insight into the performance and mechanism of magnetic Ni0.5Cu0.5Fe2O4 in activating peroxydisulfate for ciprofloxacin degradation

Contact Info

Product

Resources

About

Physiochemical properties and electromagnetic wave absorption performance of Ni0.5Cu0.5Fe2O4 nanoparticles at X-band frequency

Cited by 47 publications

References 36 publications

Heat and mass transfer in an unsteady squeezed Casson fluid flow with novel thermophysical properties: Analytical and numerical solution

Heat and mass transfer in an unsteady squeezed Casson fluid flow with novel thermophysical properties: Analytical and numerical solution

Hierarchically Porous Carbon/α‐Fe@Fe3C Absorbers Derived from Luffa Sponge with Efficient Microwave Absorption

Insight into the performance and mechanism of magnetic Ni0.5Cu0.5Fe2O4 in activating peroxydisulfate for ciprofloxacin degradation

Contact Info

Product

Resources

About

Hierarchically Porous Carbon/α‐Fe@Fe₃C Absorbers Derived from Luffa Sponge with Efficient Microwave Absorption