Lesson 5 - Advanced materials for electromagnetic attenuation
Advanced materials for electromagnetic attenuation
Recent studies are associated with the EM shielding and other properties too, such as: breathability, anti-microbial character, mechanical resistance, wash-ability [2-6]. As main application, fabrics with electro-conductivity may shield the EM radiation according to the principle of the Faraday-cage, by inducing Eddy currents with an opposite direction to the incident EM field and thus with an attenuation effect [7].
The protection against EM radiation is important nowadays, due to the various sources of EM pollution: GSM, WiFi, Power transmission lines, broadcasting etc. Such radiation may cause severe health problems to humans, according to several studies [8-9] and also interference with other electronic equipment, which should be avoided according to the protection principles of electromagnetic compatibility [7].References
1. Ziaja, J, Jaroszewski, M., EMI shielding using composite materials with plasma layers. In Electromagnetic Waves; InTechOpen: London, UK, 2011; p. 425.
2. Mengwei Dai et al., A green approach to preparing hydrophobic, electrically conductive textiles based on waterborne polyurethane for electromagnetic interference shielding with low reflectivity, Chemical Engineering Journal, (2020), https://doi.org/10.1016/j.cej.2020.127749
3. Qiongzhen Liu et al., Flexible, breathable, and highly environmental-stable Ni/PPy/PET conductive fabrics for efficient electromagnetic interference shielding and wearable textile antennas, Composites Part B 215 (2021) 108752, https://doi.org/10.1016/j.compositesb.2021.108752
4. Xiaohua Zhang, Qingwen Li et al., Developing thermal regulating and electromagnetic shielding textiles using ultra-thin carbon nanotube films, Composites Communications 21 (2020) 100409, https://doi.org/10.1016/j.coco.2020.100409
5. Esfandiar Pakdel, Xungai Wang et al, Advances in photocatalytic self-cleaning, superhydrophobic and electromagnetic interference shielding textile treatments, Advances in Colloid and Interface Science 277 (2020) 102116, https://doi.org/10.1016/j.cis.2020.102116
6. Joao Cortez et al., Sintering of nanoscale silver coated textiles, a new approach to attain conductive fabrics for electromagnetic shielding, Materials Chemistry and Physics 147 (2014) 815e822, http://dx.doi.org/10.1016/j.matchemphys.2014.06.025
7. Schwab, A., Kuerner, W., Electromagnetic compatibility, AGIR publishing house, 2013
8. Community research: Health and electromagnetic fields, EU-funded research into the impact of electromagnetic fields and mobile telephones on health, 2005
9. World Health Organization (WHO): Radiation: Electromagnetic fields - Questions and Answers,
https://www.who.int/news-room/questions-and-answers/item/radiation-electromagnetic-fields , 2015, Accessed 19.04.2022
10. The Handbook of the Textile Engineer, AGIR publishing house, 2005
11. Standard ASTM ES-07, https://infostore.saiglobal.com/en-us/standards/astm-es-7-1983-154532_saig_astm_astm_371798/ , Accessed 19.04.2022
12. Bădic M., Marinescu M-J., The Failure of Coaxial TEM Cells ASTM Standards Methods in H.F. Range, IEEE Xplore, DOI: 10.1109/ISEMC.2002.1032442 (2002)