MICROWAVE ABSORPTION STUDIES ON FERROFLUID-CONDUCTING POLYMER COMPOSITE

In this communication, preparation and characterization of nano-crystalline magnetic particles, their polymer composites prepared by varying doping level of conducting polymer, filler loading graphite in PVA and their microwave absorption studies have been discussed. The electromagnetic interference effect of super-paramagnetic particles (Fe3O4, MnZnFe2O4, CoFe2O4) of ferrofluid in polymer matrix in relation to conductivity of the composites were studied. The measurement of shielding effectiveness (SE) was carried out in X and K band microwave region. It is observed that the shielding effectiveness increases with the increase of doping and filler loading. Samples were analyzed by XRD, SEM and TEM techniques. The correlation of shielding effectiveness and electrical conductivity is discussed. The results suggest that the role of ferrite in electrically conducting matrix have higher SE. This paper focuses on applications of nano-particles and their composites towards the new technology