In this work, Core-shell structure palygorskite/nanoCaCO3(PnC) composite particles have been synthesized chemically, employing solution precipitation methods. Crystal structure, morphology and thermal stability properties are investigated by means of X-ray diffraction (XRD), transmission electronic microscopy (TEM) and Thermogravimetric (TG) analysis. The results showed that the PnC particles were almost monodispersed microsphere aspect with the size was about 1-3 μm diameter. The nanocomposite particles exhibit the marked thermal stability properties than the palygorskite clay mineral.
In this work, amorphous silicon (a-Si) thin films were prepared by ion-beam-assisted sputtering, the effect of assisted-ion-beam gases on the thin-film structure were investigated using Raman spectroscopy, Fourier transform infrared spectroscopy, and spectroscopic ellipsometry. It was observed that the introduction of assisted-ion beam improved the thin-film structure, and the ion-beam-assisted sputtering a-Si thin films possessed higher short-range order, intermediate-range order, lower microstructure parameter (R*) and defect density of states with the increased of hydrogen concentration in the assisted-ion beam gases, which due to the transfer of energy from ion to the surface Si atoms and the formation of Si-H bonds in the a-Si thin films. The a-Si thin films deposited with hydrogen-ion beam possessed the absorption coefficient at 0.8 eV and microstructure factor of 0.7 cm-1 and 0.48. It was illumined that the device-quality a-Si thin films can be achieved under the ion-beam-assisted sputtering.
In this paper, we have synthesized new functionalized Al2O3 nanoparticles successfully via reaction, which was grafted polyurethane onto the surface of nanoparticles dispersed in n-butyl acetate. The structure, surface properties, and thermal stability of the functionalized Al2O3 nanoparticles were characterized by means of by FT-IR, TGA and SEM. The results showed that the surface of Al2O3 nanoparticles has been grafted with polyurethane (PU). Furthermore, Al2O3 nanoparticles was dispersed evenly in the organic solvent, which can show a long suspension stability near to 6 months without precipitation, indicating that this product is very useful to prepare stabilized coating nanocomposites.
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