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利用溶剂热压方法,以ZnO纳米颗粒和不同种类的溶剂为原料,制备了介于纳米粉体和纳米陶瓷体之间的过渡态--体块ZnO多孔纳米固体,并研究了水热热压条件下ZnO纳米颗粒的自组装行为. 实验结果表明:当水在ZnO纳米颗粒间分布不均匀时,在水较多的区域,ZnO纳米颗粒会溶解到高温高压下的水中.温度升高水汽化并从固体中逸出时,ZnO纳米颗粒经历自组装过程而形成一些“纳米花朵” (nanoflowers),并且这种自组装行为对于样品的光致发光性质有很大影响;相反,如果水在纳米颗粒之间均匀分布,则可以得到ZnO多孔纳米固体,而且其孔径比较均匀.另外,实验结果还表明,通过改变溶剂的种类、热压温度和压力,可以在一定程度上控制ZnO多孔纳米固体的孔径及孔容.热分析结果显示,这样制备的ZnO多孔纳米固体具有较高的热稳定性.
In this paper, ZnO nanoparticle and different kinds of solvents were used as raw materials to prepare the transition state - bulk ZnO porous nano-solid between nano-powder and nano-ceramic by solvothermal method. The effects of hydrothermal hot pressing ZnO nanoparticle under the conditions of self-assembly behavior of the experimental results show that: when water is not uniformly distributed between the ZnO nanoparticles in the water more areas, ZnO nanoparticles will dissolve into the water under high temperature and high pressure water temperature And escape from the solid, the ZnO nanoparticles undergo some self-assembly processes to form some “nanoflowers” and this self-assembly behavior has a great effect on the photoluminescence properties of the sample; conversely, if water In the uniform distribution between the nanoparticles, ZnO porous nano-solid can be obtained, and its pore diameter is relatively uniform.In addition, the experimental results also show that by changing the type of solvent, hot pressing temperature and pressure can be controlled to a certain extent ZnO porous nano The pore size and pore volume of the solid were investigated.The thermal analysis results showed that the ZnO porous nano-solid prepared in this way has higher thermal stability.