Immobilization of metal-containing nanoparticles on the surface of polytetrafluoroethylene nanogranules

Microgranules and Nanoparticles on Their Surfaces

“…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).…”

“…At a sufficiently high temperature (250-300°C), a solution of a metal-containing precursor is introduced dropwise into the reactor. Decomposition of the precursor is accompanied by the formation Cl 4 -of nanoparticles of the desired composition on the surface of the microgranules [205]. Figure 2 shows a schematic of the reactor and the processes involved [205].…”

“…Figure 3 shows a TEM micrograph of one of the samples obtained in [205] and its particle size distribution.…”

“…The magnetic properties of Co-containing nanoparticles attached to the surface of PTFE granules were studied in detail in [205]. The coercive force of that material was H c = 32 kA/m at 300 K and 48 kA/m at 4.2 K, and its room-temperature saturation magnetization (in a field of 376 kA/m) was M s Ӎ 47 A m 2 /kg [205], which is substantially lower than the 160 A m 2 /kg of bulk Co.…”

Comparative study of nano iron catalysts in the presence of the crude polymer matrix and their cross link polymer in the Fischer-Trophsch synthesis

“…Such materials are highly reactive and have tendency to combined together, leading to lose their unique properties. Therefore, to keep their main properties without any change it was necessary to embed them in a matrix polymer [11][12][13][14] . The aim of the present work is prepare FTS's catalysts over iron nano-sized particles inserted in the paraffin and polymers to be loaded in dispersion medium to investigate the catalytic properties: activity, selectivity, and conversion of CO efficiency in FTS.…”