Study On The Preparations And Analytical Applications Of Two Kinds Of Nano-materials

Nano-materials, as new materials, are made from nano-particles. Due to their small size (1～100nm), nano-particles exhibit novel materials properties that differ considerably from those of the bulk solid state, such as , quantum size effect, undersized effect, surface and interface effect and macroscopical quantum tunnel effect, etc. Nano-materials are now being studied intensively as their physical and chemical properties are quite different from those of the bulk materials in optics, calorifics, electricity and magnetism.As nano-sized magnetic particles, nano-Fe3O4 are a group of technologically important magnetic materials of current interest. They are mainly used as magnetic cores in the electronics, communication and information industries. In addition, they are also extensively used as catalysts. At present, many methods have been developed to prepare nano-sized Fe3O4 powders, such as co-precipitation, micro-emulsion mediated process, mechanical trituration, hydrothermal processes, sonochemical method, sol-gel method, and so on. In this thesis, a new method by microwave method has been successfully developed for the first time. Several methods, including chemical precipitation, ultrasonic method, magenetic milling method and microwave method have been used...