tailieunhanh - NANOWIRES IMPLEMENTATIONS AND APPLICATIONS_2

Tham khảo sách 'nanowires implementations and applications_2', kỹ thuật - công nghệ, hoá học - dầu khí phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Part 4 Nanowire Fabrication 16 Obtaining Nanowires under Conditions of Electrodischarge Treatment Dikusar Alexandr Shevchenko State University Tiraspol Pridnestrovie Institute of Applied Physics Academy of Science of Moldova Chishinau Republic of Moldova 1. Introduction At present various methods for obtaining nanowires and nanotubes are known using different materials. Nevertheless the list of these methods grows constantly. This may be accounted for by the fact that on the one hand new methods for developing nanomaterials appear using both the technology of bottom-up and top-down. On the other hand it becomes clear that nanowires and nanotubes can be manufactured using the methods and technologies that are known for a long time under certain conditions. One such method is the electrodischarge treatment that is the basis for the electrodischarge machining the method that was proposed more than 50 years ago by the spouses . Lazarenko and . Lazarenko . This work describes the peculiarities of application of the electrodischarge machiningelectrodischarge doping. The conditions for manufacturing nanowires are described along with certain mechanical properties of the surfaces that are developed by introducing the nanowires into the surface layer composition. 2. Electrodischarge machining EDM and its technological use When a certain value of a critical voltage Ucr is applied across the interelectrode gap IEG that consists of two electrodes and is filled with a dielectric liquid kerosene or deionized water the electrical breakdown of the gap . the formation of the electroconducting region in this medium is registered. The order of lifetime in this region is 10-7 s Fig. 1 Ucr l Ecr where Ecr is the critical value of the field intensity that induces the gap breakdown a discharge l is the distance between the electrodes. Since both electrodes in the considered situation have a natural roughness Ecr will be reached firstly at the points with a minimum interelectrode

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