Magnetic studies of 0.7(Fe₂O₃)/0.3(ZnO) nanocomposites in nanopowder form and dispersed in polymer matrix

Abstract

Magnetic properties of 0.7(Fe 2 O 3 )/0.3(ZnO) nanocomposite synthesized by traditional wet chemistry method and containing only two phases: ZnO (nonmagnetic) and ZnFe 2 O 4 (magnetic, with nanocrystallites of average size 12 nm, but forming large agglomerates, up to 100 nm in size) were studied by DC magnetization and ferromagnetic resonance (FMR). The investigated nanocomposite was either in a form of nanopowder or dispersed at concentration of 0.1 wt.% in poly(ethylene naphthalate-block-tetramethylene oxide) PTMO-b-PEN polymer matrix. Similarities and differences in magnetic behavior of these two samples revealed by the study of static magnetization and FMR spectra have been discussed relative to different morphologies and the associated variation of interparticle interactions. Moreover, thermal and thermo-oxidative stability of the nanocomposite and the neat polymer have been studied by thermogravimetric method.

High-Efficiency DNA Extraction Using Poly(4,4′-Cyclohexylidene Bisphenol Oxalate)-Modified Microcrystalline Cellulose-Magnetite Composite

“…Typek et al [24] measured the M s and H c values for the nanopowder sample, and the results of their study indicated that the M s value was smaller than the present study results; however, the H c values were higher. As compared to other studies, the observation of such decreased H c values for composite in the present study can be attributed to the formation of composite structure with high Table 2: The values of surface area and pore volume for poly(4,4′-cyclohexylidene bisphenol oxalate).…”