Electromagnetic radiation reflection, transmission and absorption characteristics of charcoal-containing materials impregnated with chlorides aqueous solutions

The experimentally established regularities of changes in electromagnetic radiation reflection, transmission and absorption characteristics in the frequency range of 2.0–17.0 GHz of materials are presented. These materials contained powdered activated birch charcoal impregnated with chlorides aqueous solutions (calcium chloride, magnesium chloride and sodium chloride). Using the established regularities, it was determined that materials based on powdered activated birch charcoal impregnated with calcium chloride aqueous solution are radioabsorbing if they interact with electromagnetic radiation in the frequency ranges of 3.5–4.5 and 5.5–17.0 GHz. In turn, materials based on powdered activated birch charcoal impregnated with magnesium and sodium chlorides aqueous solutions are radioabsorbing if they interact with electromagnetic radiation in the frequency ranges of 2.0–17.0 and 2.0–7.5 GHz (magnesium chloride solution), 10.0–17.0 GHz (sodium chloride solution). Electromagnetic radiation absorption coefficient values of the studied materials reach 0.95. These materials seem promising for the manufacture of partitions to shield sectors of premises where electronic devices sensitive to electromagnetic interference are located.

1. Chuayjumnong S., Karrila S., Jumratb S., Pianroj Y. Activated carbon and palm oil fuel ash as microwave absorbers for microwave-assisted pyrolysis of oil palm shell waste. RSC Advances, 2020, iss. 53, pp. 32058–32068. https://doi.org/10.1039/D0RA04966B

2. Negi P., Kumar Chhantyal A. K., Dixit A. K., Kumar S., Kumar A. Activated carbon derived from mango leaves as an enhanced microwave absorbing material. Sustainable Materials and Technologies, 2021, vol. 27, art. ID e00244. https://doi.org/10.1016/j.susmat.2020.e00244

3. Boiprav O. V., Savanovich S. E., Belousova E. S. Flexible microwave absorbers based on powdered activated coconut charcoal and moisture-containing ceramsite. Materials Physics and Mechanics, 2022, vol. 50, no. 3, pp. 420–430. https://doi.org/10.18149/MPM.5032022_6

4. Pattanayak S. S., Laskar S. H., Sahoo S. Design from waste: an eco-efficient microwave absorber using dried banana leaves and charcoal based composite. Journal of Materials Science: Materials in Electronics, 2022, vol. 33, pp. 13398–13407. https://doi.org/10.1007/s10854-022-08276-9

5. Boiprav O. V., Bogush V. A. Advanced layered flexible radio-absorbing materials based on powdered charcoal. Perspektivnye materialy, 2023, no. 8, pp. 15–26 (in Russian).

6. Ayad H., Boiprav O. V., Lynkov L. M. Electromagnetic Shields Based on Powdered Coal-Containing Materials. Minsk, Bestprint Publ., 2020. 122 p.

7. Khanh Ngo H. P., Planes E., Iojoiu C., Soudant P., Rollet A.-L., Judeinstein P. Transport properties of alkali/alkaline earth cations in ionic-liquid based electrolytes. Journal of Ionic Liquids, 2022, vol. 2, no. 2, art. ID 100044. https://doi.org/10.1016/j.jil.2022.100044

8. Pinho S. P., Macedo E. A. Solubility of NaCl, NaBr, and KCl in Water, Methanol, Ethanol, and Their Mixed Solvents. Journal of Chemical and Engineering Data, 2005, vol. 50, no. 1, pp. 29–32. https://doi.org/10.1021/je049922y

9. Liang W., Jin-Xiang C., You L., Lei L., Yin-Chang D., Jia W. Anomalous microwave reflection from a metal surface induced by spoof surface plasmon. Chinese Physics B, 2012, vol. 21, no. 1, art. ID 017301. https://doi.org/10.1088/1674-1056/21/1/017301

10. Boiprav O., Ayad H., Abdaljlil S. A., Lynkou L., Abdulmawlay M. Charcoal- and Foil-Containing Materials for Radio Electronic Control Systems Protection from Electromagnetic Interferences. 2022 IEEE 21st International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA), December 2022, pp. 299–304. https://doi.org/10.1109/STA56120.2022.10019059

11. Erkelens J. S., Venema V. K. C., Russchenberg H. W. J., Ligthart L. P. Coherent Scattering of Microwaves by Particles: Evidence from Clouds and Smoke. Journal of the Atmospheric Sciences, 2001, vol. 58, iss. 9, pp. 1091–1102. https://doi.org/10.1175/1520-0469(2001)0582.0.CO;2

12. Hong G., Yang P., Weng F., Liu Q. Microwave scattering properties of sand particles: Application to the simulation of microwave radiances over sandstorms. Journal of Quantitative Spectroscopy and Radiative Transfer, 2008, vol. 109, no. 4, pp. 684–702. https://doi.org/10.1016/j.jqsrt.2007.08.018

13. Sterlyadkin V. V. Some Aspects of the Scattering of Light and Microwaves on Non-Spherical Raindrops. Atmosphere, 2020, vol. 11, iss. 5, art. ID 531. https://doi.org/10.3390/atmos11050531

14. Shukla V. Review of electromagnetic interference shielding materials fabricated by iron ingredients. Nanoscale Advances, 2019, iss. 5, pp. 1640–1671. https://doi.org/10.1039/C9NA00108E

15. Hwang U., Kim J., Seol M., Lee B. Park I.-K., Suhr J., Nam J.-D. Quantitative Interpretation of Electromagnetic Interference Shielding Efficiency: Is It Really a Wave Absorber or a Reflector? ACS Omega, 2022, vol. 7, no. 5, pp. 4135–4139. https://doi.org/10.1021/acsomega.1c05657

16. Gaoui B., Hadjadj A., Kious M. Enhancement of the shielding effectiveness of multilayer materials by gradient thickness in the stacked layers. Journal of Materials Science: Materials in Electronics, 2017, vol. 28, pp. 11292–11299. https://doi.org/10.1007/s10854-017-6920-8

17. Duan J., Wang X., Li Y., Liu Z. Effect of double-layer composite absorbing coating on shielding effectiveness of electromagnetic shielding fabric. Materials Research Express, 2019, vol. 6, no. 8, art. ID 086109. https://doi.org/10.1088/2053-1591/ab1d2d