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Magneto‐dielectric and magneto‐conducting fillers based polymer composites: Effect of functionalization, coating and dispersion process on electromagnetic shielding properties
Author(s) -
Vyas Manoj Kumar,
Chandra Amita
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50602
Subject(s) - materials science , composite material , dielectric , nanocomposite , surface modification , coating , carbon nanotube , nanoparticle , electromagnetic shielding , polymer , epoxy , dispersion (optics) , electrolyte , magneto , chemical engineering , nanotechnology , electrode , voltage , physics , optoelectronics , optics , engineering , chemistry , quantum mechanics
Electromagnetic interference shielding of magneto‐dielectric (BaTiO 3 ‐Fe 3 O 4 ) and magneto‐conducting ( f ‐MWCNT‐Fe 3 O 4 ) fillers based polymer electrolyte composites in the X‐band have been studied in the present work. Magneto‐dielectric and magneto‐conducting fillers have been obtained by in situ preparation of Fe 3 O 4 nanoparticles by chemical precipitation in the presence of BaTiO 3 and functionalized multiwalled carbon nanotubes ( f‐ MWCNT). Functionalization of MWCNT has resulted in their strong bonding with the polymer electrolyte adversely affecting the charge transport properties and shielding effectiveness. Dielectric, magnetic and conducting properties of the magneto‐dielectric and magneto‐conducting fillers are found to be significantly different as a result of coating by Fe 3 O 4 nanoparticles on BaTiO 3 and f‐ MWCNT. Combining two fillers in a single nanocomposite has exhibited non‐complimentary addition of their individual properties. The ultra‐sonication method of dispersion of the magneto‐conducting filler has been found to give better conducting and shielding effectiveness in comparison to the homogenization method due to better disentanglement of the nanotubes.