Carbon covered magnetic nickel nanoparticles embedded in PBT-PTMO polymer: Preparation and magnetic properties

In situ synthesis, morphology and magnetic properties of poly(ether–ester) multiblock copolymer/carbon-covered nickel nanosystems

“…The dynamical magnetic fluctuations of the spin systems influence the broadening of the FMR spectra that is usually connected with magnetic critical phenomena (e.g., magnetic ordering processes). [23]. The ratio of intensity vs. temperature change is essentially greater than for smaller concentrations.…”

“…The detailed experimental procedure has been described in our previous work [23]. According to the XRD measurements, the obtained samples contained fcc nickel and graphite (see Fig.…”

“…It has been shown that a small amount of nanoparticles could substantially change the melting point and polymer-glass transition temperature [11,22]. Recently, nano-size and carbon covered nickel metal particles have been used to lower the reactivity and to improve the stability of polymers (0.1 wt.% Ni/C in PBT-block-PTMO) [23]. The dependence of the ferromagnetic resonance (FMR) field (H r ) on temperature has shown a very considerable change [23].…”

“…Recently, nano-size and carbon covered nickel metal particles have been used to lower the reactivity and to improve the stability of polymers (0.1 wt.% Ni/C in PBT-block-PTMO) [23]. The dependence of the ferromagnetic resonance (FMR) field (H r ) on temperature has shown a very considerable change [23]. This behavior could be associated with the spin reorientation processes inside the matrix.…”