Nano-lithium ferrite/nanosilica-filled butadiene-acrylonitrile rubber for microwave absorption

Mahmoud, D.S.; Eldesouki, E.M.; Abd El-Gawad, W.M.

doi:10.1016/j.matchemphys.2023.128673

Materials Chemistry and Physics

2024

DOI: 10.1016/j.matchemphys.2023.128673

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Nano-lithium ferrite/nanosilica-filled butadiene-acrylonitrile rubber for microwave absorption

D.S. Mahmoud,

E.M. Eldesouki,

W.M. Abd El-Gawad

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Cited by 4 publications

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Multi‐Interface Electromagnetic Wave Absorbing Material Based on Liquid Marble Microstructures Anchored to SEBS

Xiao,

Chen,

Shi

et al. 2024

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The direct application of liquid marbles in electromagnetic wave (EMW) absorption is challenging due to their poor stability, susceptibility to gravitational collapse, and shaping difficulties. To address this issue, a novel strategy is proposed to incorporate liquid marble microstructures (NaCl/nano‐SiO2) encapsulated in organic phases (Octadecane) into the rubber‐matrix (SEBS) using the ultrasound‐assisted emulsion blending method. The resulting NaCl/SiO2/Octadecane microstructures anchored to SEBS offer a substantial solid–liquid interface consisting of NaCl solution and SiO2. When subjected to an alternating electromagnetic (EM) field, the water molecules and polysorbate within SiO2 exhibit heightened responsiveness to the EM field, and the movement of Na+ and Cl− within these microstructures leads to their accumulation at the solid–liquid interface, creating an asymmetric ion distribution. This phenomenon facilitates enhanced interfacial polarization, thereby contributing to the material's EMW absorption properties. Notably, the latex with 16 wt% SEBS (E‐3), exhibiting a surface morphology similar to human cell tissues, achieves complete absorption of X‐band (fE = 4.20 GHz, RLmin = −33.87 dB). Moreover, the latex demonstrates light density (0.78 g cm−3) and environmental stability. This study not only highlights the predominant loss mechanism in rubber‐based wave‐absorbing materials but also provides valuable insights into the design of multifunctional wave‐absorbing materials.

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Multi‐Interface Electromagnetic Wave Absorbing Material Based on Liquid Marble Microstructures Anchored to SEBS

Xiao,

Chen,

Shi

et al. 2024

Small

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Optimization of (Ba1−xCax)(Ti0.9Sn0.1)O3 ceramics in X-band using Machine Learning

Dikshit,

Das,

Samal

et al. 2024

Journal of Alloys and Compounds

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Development of high performance microwave absorption modified epoxy coatings based on nano-ferrites

Abd El-Gawad,

Eldesouki,

Abd El-Ghany

2024

Sci Rep

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With the rapid spread of wireless technologies and increasing electromagnetic energy, electromagnetic waves (EMW) have become a severe threat to human health. Therefore, minimizing the harmful effects of electromagnetic wave radiation is possible through the development of high-efficiency EMW absorption coatings. The aim of this work was to generate microwave absorbance coatings containing synthesized nano-CuFe2O4 and nano-CaFe2O4. Firstly, nano-CuFe2O4 and nano-CaFe2O4 were synthesized using the sol–gel method. Then, their structure, electrical, dielectric, and magnetic properties were investigated to find out the possibility of using these materials in high-frequency applications (e.g., microwave absorbance coatings). After that, two dosages (2.5 wt% and 5 wt%) of nano-CuFe2O4 and nano-CaFe2O4 were incorporated into epoxy resin to prepare modified epoxy resin as microwave coatings. The dielectric studies show that the AC conductivity of the prepared samples is high at high frequencies. Additionally, the magnetic properties reveal a low coercivity value, making these samples suitable for high-frequency devices. The microwave results illustrate that adding nano-ferrites with high content enhances the absorption characteristics of the tested films. The results showed that the two films have two absorption bands with RL < –10 dB ranging from 10.61 to 10.97 GHz and from 10.25 to 11.2 GHz. The minimum return loss achieved for the two cases is −13 and −16 dB, respectively. Indicating that the film coated with CuFe has a better absorption value than the one coated with CaFe.

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Nano-lithium ferrite/nanosilica-filled butadiene-acrylonitrile rubber for microwave absorption

Cited by 4 publications

References 32 publications

Multi‐Interface Electromagnetic Wave Absorbing Material Based on Liquid Marble Microstructures Anchored to SEBS

Multi‐Interface Electromagnetic Wave Absorbing Material Based on Liquid Marble Microstructures Anchored to SEBS

Optimization of (Ba1−xCax)(Ti0.9Sn0.1)O3 ceramics in X-band using Machine Learning

Development of high performance microwave absorption modified epoxy coatings based on nano-ferrites

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