Advanced Carbon Based Foam Materials for EMI Shielding

Surendran, Anu; Aswathi, M. K.; Geethamma, V. G.; Thomas, Sabu

doi:10.1002/9781119128625.ch14

Cited by 2 publications

(2 citation statements)

References 64 publications

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“…11,14−16 Also, these possess low weight, corrosion resistance, and high surface area. 17,18,8,19 In the past, numerous scientists have developed various techniques to produce porous carbon materials, including pitch-based and polymer-based carbon foams. 17,20,21 Narasimman et al 22 have successfully fabricated carbon foam with multiwalled carbon nanotubes (MWCNTs) through the thermoforming technique, utilizing molten sucrose as the precursor material.…”

Section: ■ Introductionmentioning

confidence: 99%

Microwave Absorption Performance of Flexible Porous PVDF-MWCNT Foam in the X-Band Frequency Range

Khade,

Wuppulluri

2024

ACS Omega

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Lightweight electromagnetic absorbers made of polymers and multiwall carbon nanotubes (MWCNTs) have attracted a lot of attention because of their potential to shield next-generation electronics devices from electromagnetic radiation without reflecting it back into space. In this research, a flexible foam composed of MWCNTs and polyvinylidene fluoride (PVDF) is developed. This foam is designed to be an electromagnetic shielding material that is both flexible and absorption-dominant, reducing electromagnetic interference. The solvent approach is used to fabricate the PVDF-MWCNT foam. It is discovered that the foam has a porosity of 88.9%. Each cell in the PVDF-MWCNT foam is formed in a porous layered manner. The foam demonstrates a dielectric constant (ϵ′) of around 7.19 and dielectric loss (ϵ " ) of 4.46 at 9.96 GHz as calculated from MATLAB using the Nicolson− Ross−Wire algorithm. This developed EM absorber exhibits a high shielding efficiency of 78.46 dB. With an ideal reflection loss of −26.5 dB, this absorber attains the desired outcomes. The electromagnetic shielding performance is supported by calculations of the impedance matching degree, which was found to be 0.54. The PVDF-MWCNT foam displayed absorption-dominant characteristics, with a significantly low shielding due to reflection. This newly developed foam EM absorber has proven itself capable in a variety of commercial and stealth-related applications.

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Section: ■ Introductionmentioning

confidence: 99%

Microwave Absorption Performance of Flexible Porous PVDF-MWCNT Foam in the X-Band Frequency Range

Khade,

Wuppulluri

2024

ACS Omega

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“…Absorbing materials exhibit high dielectric loss, leading to the absorption of microwaves, the extent of which depends on the dielectric loss factor [8,9]. This absorption is inversely related to both transmission and reflection, resulting in the conversion of microwave energy into heat [10].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characteristics of High-Performance, Low-Density Metallo–Ceramics Composite

Abramovskis,

Drunka,

Csáki

et al. 2023

Materials

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By applying the physical vapour deposition method, hollow ceramic microspheres were coated with titanium, and subsequently, they were sintered using the spark plasma sintering technique to create a porous ceramic material that is lightweight and devoid of a matrix. The sintering process was carried out at temperatures ranging from 1050 to 1200 °C, with a holding time of 2 min. The samples were subjected to conventional thermal analyses (differential scanning calorimetry, thermogravimetry, dilatometry), oxidation resistance tests, and thermal diffusivity measurements. Phase analysis of the samples was performed using the XRD and the microstructure of the prepared specimens was examined using electron microscopy. The titanium coating on the microspheres increased the compressive strength and density of the resulting ceramic material as the sintering temperature increased. The morphology of the samples was carefully examined, and phase transitions were also identified during the analysis of the samples.

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Advanced Carbon Based Foam Materials for EMI Shielding

Cited by 2 publications

References 64 publications

Microwave Absorption Performance of Flexible Porous PVDF-MWCNT Foam in the X-Band Frequency Range

Microwave Absorption Performance of Flexible Porous PVDF-MWCNT Foam in the X-Band Frequency Range

Preparation and Characteristics of High-Performance, Low-Density Metallo–Ceramics Composite

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