The Effect of High Gravity Field on the Hydrothermal Preparation of the Nanostructured Materials

Abstract:

The nanostructured ZnS, CdS/CdCO₃ and MnCO₃ were prepared by the hydrothermal method with gravity field of 1000 /g in the oil/water system at 100-150 for 0.5h. The products were characterized by eld-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD) and BET method. The results showed that the ZnS samples obtained using ZnCl₂ and Na₂S₂O₃ as precursors at 100-120 for 0.5h were the polycrystalline microspheres self-assembled by the crystallites with the size of 3-25nm. The pore volume of polycrystalline microspheres decreased with the increase of the size of the applied gravity forces. The morphology of CdS/CdCO₃ samples obtained at 100 for 0.5h was the flower-like structure, while the as-prepared samples at 120 for 0.5h were the nanoceramic microspheres in shape. The gravity force favors the formation of CdS/CdCO₃ samples. Moreover, the MnCO₃ polycrystalline flake can be obtained at 100-120 for 0.5h under gravity field of 1000 /g.

• Periodical: Materials Science Forum (Volumes 745-746)
• Pages: 78-83
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.745-746.78
• Online since: February 2013
• Authors: Wen Jun Li, Tang Zhou, Liu Liu Ding, Lu Fang
• Keywords: CdS/CdCO₃, Gravity Field, Hydrothermal, MnCO₃, ZnS

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