Preparation Of Nanosized Oxide With Hydrothermal Method At Lower-temperature And The Study On Their Property

Because hydrothermal method has a lot of advantage, such as, the reaction is controllable and the lower consumed energy et al. It was widely used in nano-oxide preparation. But the hydrothermal method has not been maturely studied in nano-magnesia preparation.In this paper we introduced the hydrothermal method and it's application in nano-oxide preparation and the current situation. We also introduced the nano-magnesia which is expected to have novel mechanical, catalytic and electronic properties. We successfully prepared ultra-fine nano-magnesia by hydrothermal method at lower-temperature. We studied anti-bacterial of nano-magnesia, and the best anti-bacterial concentration for three kinds of bacterium, and discussed the antibacterial function. We studied the preparation of nano-lanthana in hydrothermal method and obtained lanthana nano powders and investigated it's catalysis of thermal decomposition of the AP.Cubic crystalline of nanosized magnesium oxide was successfully prepared by the hydrothermal method at lower temperature. The preparation process consists of the synthesis of precursors (MgC₂O₄) by the hypothermal process using magnesium dichloride and sodium oxalate as raw materials in the exist of the surfactant and calcining of the precursors to obtain MgO nanocrystalline. The as-prepared sample was characterized by TG-DTA, FTIR, TEM, SAEM, XRD and BET. The results showed that the crystalline was uniform and unabridged, and the size of the crystals is about 5nm.The ultra-fine nano-magnesia we obtained were used for anti-bacteria test, and we found that it had obvious anti-bacterial action for the selective bacterium and the best anti-bacterial concentration is 4mg/ml. Anti-bacterial function was also discussed.Nano-lanthana was prepared by hydrothermal method. The as-prepared sample was characterized by TEM and XRD. It's catalysis of thermal decomposition of the AP was investigated and it was found that Nano-lanthana had catalysis for thermal decomposition of AP and could bring down the temperature of pyrolysis.