The lubricating and catalytic properties of two kinds of nano-MoS2, namely nano-sphere and nano-platelet, were investigated. Results showed that the amount of nano-spheres with a low BET area in the contact area was not enough to lubricate the steel friction pair. However, MoS2 nano-platelets with a high BET area could well function as a powder lubricant. The high BET area also improved the catalytic activity of MoS2 nano-platelets. The findings indicated MoS2 nano-platelets have potential applications in powder lubrication and photocatalysis.
Using FeSO4(NH4)2SO4•6H2O and triethanolamine as iron and alkali sources, magnetite Fe3O4 nanoparticles are synthesized through a microwave-assisted chemical route. The as-prepared products are characterized by X-ray diffraction, field-emission scanning electron microscopy and transmission electron microscopy. The sizes of Fe3O4 nanoparticles ranging from 5 to 20 nm are obtained. The magnetic property of the obtained Fe3O4 nanoparticles is studied by vibrating sample magnetometer. Magnetic analysis reveals that the Fe3O4 nanoparticles are ferromagnetic with a saturation magnetization of 25.5 emu•g-1. The growth mechanism of Fe3O4 nanoparticles is also simply discussed.
Intergranular-type TiC-Ni cermets acquired by spark plasma sintering were reported. Composition and microstructure were studied by X-ray diffraction, field-emission scanning electron microscopy and transmission electron microscopy. Results revealed that TiC@Ni nanopowders less than 100 nm could be effectively used as raw materials to fabricate TiC-Ni cermets at lower sintering temperature by spark plasma sintering.
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