Double-layered radar absorbing structures of MnZn ferrite/Pani-coated MWCNT filled nanocomposites for X-band frequencies

Haritha, T.; Ramji, K.

doi:10.1080/14658011.2021.1971361

Cited by 8 publications

(3 citation statements)

References 67 publications

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“…The addition of CNTs has the potential to improve the thermoelectric properties of the composites and produce the Peltier effect. When Mn 2+ , Zn 2+ , and Fe 3+ are absorbed into carboxyl group-dense regions on the surface of CNTs during chemical co-precipitation, electrostatic interactions lead to the formation of Mn-Zn ferrite nanoparticles [11]. After being treated with strong nitric acid, some metal ions enter the CNT walls and create Mn-Zn ferrite nanoparticles as the ports of the CNTs open at both ends.…”

Section: Mema-2023 Journal Of Physics: Conference Series 2557 (2023) ...mentioning

confidence: 99%

The Correlation Between the Temperature Control Effect and Thermoelectric Properties of CNTs/Mn-Zn Ferrite Composites

Zhang

2023

J. Phys.: Conf. Ser.

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Mn-Zn ferrite has been widely used in cancer therapy. In this paper, CNTs/Mn-Zn ferrite composites with different CNT contents were synthesized using the co-precipitation process and then sintered into bulk materials by SPS. The nanoparticles have good heating and temperature control effects under an alternating magnetic field. Furthermore, the sintered composites have thermoelectric properties. The correlation between the temperature control mechanism and the thermoelectric properties of manganese zinc ferrite for thermotherapy is investigated.

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Section: Mema-2023 Journal Of Physics: Conference Series 2557 (2023) ...mentioning

confidence: 99%

The Correlation Between the Temperature Control Effect and Thermoelectric Properties of CNTs/Mn-Zn Ferrite Composites

Zhang

2023

J. Phys.: Conf. Ser.

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“…These fillers are introduced as a mixture into the volume of matrices. Both mixtures of magnetic powders and non-magnetic particles in combination with magnetic inclusions can be used as such fillers [ 55 , 56 , 57 ].…”

Section: Radio-absorbing Materials and Technologies For Their Productionmentioning

confidence: 99%

Radio-Absorbing Materials Based on Polymer Composites and Their Application to Solving the Problems of Electromagnetic Compatibility

et al. 2022

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Recently, designers of electronic equipment have paid special attention to the issue of electromagnetic compatibility (EMC) of devices with their own components and assemblies. This is due to the high sensitivity of semiconductor microcircuits to electromagnetic interference. This interference can be caused either by natural phenomena, such as lightning strikes, or by technical processes, such as transients in circuits during fast periodic or random switching. Either way, interference implies a sudden change in voltage or current in a circuit, which is undesirable, whether it propagates along a cable or is transmitted as an electromagnetic wave. The purpose of this article is to review the works devoted to the development, creation, and investigation of modern polymeric nanocomposite materials used for shielding electromagnetic radiation and their effective application for solving problems of electromagnetic compatibility. Additionally, the approach to design EMI shielding complex media with predetermined parameters based on investigation of various properties of possible components is shown. In the review, all polymer composites are classified according to the type of filler. The issues of the interaction of a polymer with conductive fillers, the influence of the concentration of fillers and their location inside the matrix, and the structure of the nanocomposite on the mechanisms of electromagnetic interaction are considered. Particular attention is paid to a new generation of nanocomposite materials with widely adjustable electrical and magnetic properties. A wide class of modern filled polymeric materials with dielectric and magneto-dielectric losses is considered. These materials make it possible to create effective absorbers of electromagnetic waves that provide a low level of reflection coefficient in the microwave range. The model mechanisms for shielding electromagnetic radiation are considered in the paper. A detailed review of the electro-physical properties of polymer nanocomposites is provided. Multilayer electrodynamic media containing combinations of layers of filled polymer composite materials with nanoparticles of different compositions and manufactured using a single technology will make it possible to create electrodynamic media and coatings with the required electro-physical characteristics of absorption, transmission, and reflection. Within the framework of the two-layer coating model, the difference in the effects of the interaction of electromagnetic radiation with conductive layers located on a dielectric and metal substrate is demonstrated. It is shown that in order to achieve optimal (maximum) values of reflection and absorption of electromagnetic radiation in the appropriate frequency range, it is necessary to fit the appropriate layer thicknesses, specific conductivity, and permittivity. Such approach allows designers to create new shielding materials that can effectively vary the shielding, absorbing, and matching characteristics of coatings over a wide frequency band. In general, it can be said that the development of innovative polymer composite materials for shielding electronic devices from electromagnetic interference and excessive electromagnetic background is still an important task. Its solution will ensure the safe and uninterrupted operation of modern digital electronics and can be used for other applications.

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“…In its conducting form, polyaniline chains typically adopt a helical or coiled conformation, facilitating charge transport along the polymer chains. Additionally, polyaniline exhibits exceptional environmental stability, mechanical exibility, and ease of synthesis, further enhancing its utility in practical applications [14][15][16]. While, manganese zinc ferrite (MZF) is a magnetic material belonging to the ferrite family.…”

Section: Introductionmentioning

confidence: 99%

Constructing magneto-dielectric dual absorption performance of epoxy based nanocomposites filled with polyaniline-manganese zinc ferrite

Pratap,

Chaurasia,

Shukla

et al. 2024

Preprint

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In this study, we investigate the microwave absorbing properties of epoxy based nanocomposites incorporated with polyaniline-manganese zinc ferrite (PAni-MZF) as hybrid active fillers. Carbonaceous materials due to their high conductivity and weight ratio have emerged as a potential class of electromagnetic interference (EMI) shielding materials while ferrimagnetic materials have unique properties like; magneto crystalline anisotropic and magnetic permeability. Consequently, constructed nanocomposites capable of efficient absorption and shielding to electromagnetic radiation are of paramount importance for electronic and communication applications. Synthesized PAni and MZF nano-fillers have been dispersed with 1.9, 2.4 and 2.9 weight percentages for a series of PAni / MZF-epoxy nano-composites. Synthesized PAni has been characterized for phase and surface morphology using X-ray diffraction (XRD) and Field emission electron microscope (FESEM) respectively. On the other hand, prepared nano-composites were characterized for structural, magnetic and electromagnetic (EM) absorbing properties using FESEM, Vibrating sample magnetometer (VSM) and vector network analyzer (VNA). The combination of magneto-dielectric characteristics has shown the synergetic effect, leading to improved EM absorbing properties for the X Band frequency domains. Constructed nanocomposite’s properties have been demonstrating remarkable reflection loss. Consequently, designed absorbers hold significant application in the EMI shielding, aerospace industries and suppressing of radar signatures.

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Double-layered radar absorbing structures of MnZn ferrite/Pani-coated MWCNT filled nanocomposites for X-band frequencies

Cited by 8 publications

References 67 publications

The Correlation Between the Temperature Control Effect and Thermoelectric Properties of CNTs/Mn-Zn Ferrite Composites

The Correlation Between the Temperature Control Effect and Thermoelectric Properties of CNTs/Mn-Zn Ferrite Composites

Radio-Absorbing Materials Based on Polymer Composites and Their Application to Solving the Problems of Electromagnetic Compatibility

Constructing magneto-dielectric dual absorption performance of epoxy based nanocomposites filled with polyaniline-manganese zinc ferrite

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