Metal-Containing Poly(tetrafluoroethylene): A Novel Material

Microgranules and Nanoparticles on Their Surfaces

“…The data obtained in [204] demonstrate that, both at 5 and 300 K, the material studied behaves as a typical ferromagnet (displays a hysteresis loop). The coercive force of that material was H c = 12 kA/m at 300 K and 56 kA/m at 5 K, and its blocking temperature was 765 K [204]. The material was also characterized by EPR.…”

“…The 4.2-K saturation magnetization in a field of 400 kA/m was 52 A m 2 /kg. The magnetic moment per atom was 0.51µ B at 300 K and 0.57µ B at 4.2 K. The blocking temperature of the Co-containing particles was Ӎ270 K. The EPR spectra measured in [205] attested to a complex structure of the Co-containing nanoparticles, just as in the case of the Fe-containing nanoparticles studied in [204].…”

“…Thermal decomposition of metal-containing precursors on the surface of microgranules is a versatile method which offers the possibility of producing nanoparticles of various compositions (Table 2) with a sufficiently narrow size distribution. An important feature of this method is a "fluidized" bed of microgranules (PTFE, SiO 2 , and others) created over heated hydrocarbon oil [203,204]. At a sufficiently high temperature (250-300°C), a solution of a metal-containing precursor is introduced dropwise into the reactor.…”

“…The magnetic properties of Fe-and Co-containing particles immobilized on the surface of PTFE granules were studied in [204,205]. The data obtained in [204] demonstrate that, both at 5 and 300 K, the material studied behaves as a typical ferromagnet (displays a hysteresis loop).…”

Polymer Nanocomposites: Synthesis and Physical Properties

“…Various polymers can be used for this purpose, e.g. polyethylene (Gubin et al, 2005, b;Zanetti & Costa, 2004), polypropylene (Gubin et al, 2005, b;Zanetti et al, 2001), polytetrafluoroethylene (Korobov et al, 2004;Yurkov et al, 2006), etc. These polymers have relatively high thermal stability, unique rheologic properties, high dielectric strength, they are chemically inert and processable, which provides means for fabrication of objects of desired form and dimensions.…”