| Other Abstract | "Nanometer technology is a newly arisen front science in science research field in recent twenty years. Because nanoparticles are the untra-fine particles that the particles size generally within the scope of 1～100 nm, nanoparticles indicate characteristics such as small size effect, surface effect, quantum size effect and quanta tunnel effect, etc. Consequently result in the dramatic properties in mechanics, calorifics, electrics, optics, magnetic, chemistry properties, sensitive and surface stability, and appear many strange phenomena differ from the macroscopic materials and single isolated atom. Recent years, the great progress and fruitful achievements have been made in nanomaterials studies. Therefore, nanometer technology will arouse great interest for theoretical researches, application and exploration, etc.
This thesis reviews the production and development of nanometer technology as well as the preparation and application of the metallic nanopowders, and particularly introduces the plasma apparatus self-designed and fabricated by ourselves. Our experimental method is based upon the physical method of preparation metallic nanopowders by condensed arc discharging plasma method. The thesis summarized the research work of preparing the production of nanopowders by condensed arc discharging plasma method. Some important results are as follows:
(1) The pure Ni, Cu, Fe, Zn nanopowders of high quality were fabricated successfully by condensed arc discharging plasma method. The crystal microstructure, morphology, heat stability, the specific surface area, pore structure and specific surface area of asdeposited nano-powders were characterized by means of X-ray powder diffraction (XRD), transmission electron microscopy (TEM)，the corresponding electron diffraction (ED), thermogravimetric analyzer（TGA）, diffirential scanning calorimeter（DSC）and Brunauer-Emmett-Teller (BET)，respectively.
(2) The average size of metallic nanoparticles was estimated by Scherrer formula. In addition, the surface area, pore volume, pore size of metallic nanopowders accurately calculated by Brunauer-Emmett-Teller (BET) specific surface area method. As a result, the metallic nanopowders can be used as the material in the chemical promoter.
(3) In a condensed arc discharging plasma conditions, this article discussed the growth meachanism of heterogeneous reaction of metallic nanopowders by experimental parameters and chemical analysis data.
(4) This article demonstrate... |
