| Nanometer magnesium oxide（MgO）which is of good thermal conductivity,electrical insulation and high temperature resistance is widely applied in several fields such as catalyst,adsorbent and antibacterial agent.However,there are still some problems during preparation of Nanometer magnesium oxide,such as wide particle size distribution,uneven morphologyand poor dispersibility.In addition,nano-magnesia can be used as antibacterial materials,and the study of its physicochemical properties on the antibacterial ability is not deep enough.Above all,nano-MgO with micro-nano structure was fabricated using precursor-pyrolysis method,and antibacterial properties were also tested.The research results mainly include the following aspects:（1）basic magnesium sulfate nanowires（MOS）and flake magnesium hydroxide which were the precursors of basic magnesium chloride（BMC）whiskerswere prepared through hydrothermal or precipitation method.The pyrolysis processes were studied,and the thermal decomposition equations of BMC whisker,MOS nanowiresand Mg（OH）2 were obtained using TG,XRD,SEM and FT-IR as analysis methods.（2）The activation energy E and the pre-exponential factor A were obtained by the thermal decomposition kinetics of the obtained three precursors.Subsequently,the most probable thermal decomposition mechanism functions of each stage of precursors were determined by Satava method.（3）The crystallinity,particle size and purity of the pyrolysis products were investigated by adjusting pyrolysis conditions like burning temperature,heating rate and constant temperature of the obtained three precursors.Finally,the optimal pyrolysis conditions of the precursors were illustrated combined with the thermal decomposition mechanism.（4）The particle size,activity,Zeta potential,specific surface area,exposed crystal faces,and the antibacterial abilities were tested,based on the obtained nano-MgO.Meanwhile,the main factors that affects the antibacterial ability of nano-MgO were identified. |
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