锌和银纳米颗粒的熔化
发布时间：2018-09-13 14:23
【摘要】：金属纳米颗粒的熔点随其颗粒尺寸的变化而变化,其热稳定性及熔化会影响材料的使役行为,是材料选取和工艺设计等诸多环节的重要参数,因此研究金属纳米颗粒的熔化行为具有重要意义。一直以来,在对金属纳米颗粒的熔化行为进行更多研究时,由于受到样品制备方法的影响,所得实验数据有限,限制了该课题的进一步发展。本实验室已经对金属纳米颗粒的熔点进行了深入研究,突破了以往的体系。通过机械球磨法研究了SiO2包覆的Fe和Cu纳米颗粒的熔化现象,以及LiF包覆的Sn纳米颗粒的熔化现象。在上述研究基础上,本文利用机械球磨法制备不同基体包覆的Zn纳米颗粒,并探究其熔化现象:(1)通过机械球磨法制备Al2O3包覆的Zn纳米颗粒以及LiF包覆的Zn纳米颗粒,所得的Zn纳米颗粒的颗粒尺寸分布集中。(2)制备所得的Al2O3包覆的Zn纳米颗粒其颗粒尺寸最小为23 nm,热分析表明其熔点是403℃,相对于体相熔点下降了17℃。而LiF包覆的Zn纳米颗粒颗粒尺寸最小为16 nm,热分析表明其熔点是398℃,相对于体相熔点下降了22℃。Zn纳米颗粒的熔点下降值与理论计算值相符合。同时本文采用机械球磨法制备不同基体包覆的Ag纳米颗粒,探究Ag纳米颗粒的熔化现象。采用机械化学合成法制备C包覆的Ag纳米颗粒时,发现Ag纳米颗粒尺寸为19 nm,热分析表明其熔点为945℃,相对于体相熔点下降了17℃,与理论计算值相符合,丰富了实验数据。
[Abstract]:The melting point of metal nanoparticles varies with the change of particle size. Its thermal stability and melting will affect the causative behavior of the material, which is an important parameter in material selection and process design. Therefore, it is of great significance to study the melting behavior of metal nanoparticles. For a long time, due to the influence of the method of sample preparation, the experimental data are limited, which limits the further development of the subject when more research on the melting behavior of metal nanoparticles is carried out. The melting point of metal nanoparticles has been studied in our laboratory, breaking through the previous system. The melting phenomena of SiO2 coated Fe and Cu nanoparticles and LiF coated Sn nanoparticles were studied by mechanical ball milling. On the basis of the above research, Zn nanoparticles coated with different substrates were prepared by mechanical ball milling and their melting phenomena were investigated. (1) Al2O3 coated Zn nanoparticles and LiF coated Zn nanoparticles were prepared by mechanical ball milling. The particle size distribution of the obtained Zn nanoparticles is concentrated. (2) the Al2O3 coated Zn nanoparticles have the smallest particle size of 23 nm, and the melting point is 403 鈩，
本文编号：2241423
[Abstract]:The melting point of metal nanoparticles varies with the change of particle size. Its thermal stability and melting will affect the causative behavior of the material, which is an important parameter in material selection and process design. Therefore, it is of great significance to study the melting behavior of metal nanoparticles. For a long time, due to the influence of the method of sample preparation, the experimental data are limited, which limits the further development of the subject when more research on the melting behavior of metal nanoparticles is carried out. The melting point of metal nanoparticles has been studied in our laboratory, breaking through the previous system. The melting phenomena of SiO2 coated Fe and Cu nanoparticles and LiF coated Sn nanoparticles were studied by mechanical ball milling. On the basis of the above research, Zn nanoparticles coated with different substrates were prepared by mechanical ball milling and their melting phenomena were investigated. (1) Al2O3 coated Zn nanoparticles and LiF coated Zn nanoparticles were prepared by mechanical ball milling. The particle size distribution of the obtained Zn nanoparticles is concentrated. (2) the Al2O3 coated Zn nanoparticles have the smallest particle size of 23 nm, and the melting point is 403 鈩，
本文编号：2241423
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