碩士 / 高苑科技大學 / 高分子環保材料研究所 / 95 / Since the first application in diamond nanoparticle, energetic explosives providing the need of high temperatures and high shock waves can be used to produce nano-materials. Recently, many methods have been developed to synthesize nano-materials such as arc-discharge of graphite electrode, catalytically decomposition of hydrocarbons, laser ablation and catalytic disproportionation of CO. However, these processes are both high energy and hardware intensive, which lead to high cost of nano-materials and therefore constrains their practical application. Therefore, catalytic detonation of carbon-rich explosives can be designed as a useful method and with the potential application for the production of nano-structured materials.
Nano-materials have been synthesized by a self-heating detonation process using RDX explosives with or without the presence of various metallic-containing catalysts. This research presents the use of this specially system to study the catalytic detonation process, the relationship between the experimental conditions and product distribution and roles of the catalyst types. The products of carbon nano-materials and nano-scale catalyst particles are characterized by XRD, SEM, EDX and TEM techniques. The detonation of pure RDX alone results in very little solid carbon, and the contained solid product shows no tubular structure with a lot of disordered amorphous carbon, with only little spherical carbon nanoparticles. The morphologies, crystallinity and structure of nano-materials are dependent on the kind of catalyst (Co, Ni, cobalt acetate, nickel formate and NiB) used in this study. In the formation of sphere encapsulated with metal nanocrystals, the detonation reaction gives a very high ratios of metal/carbon atmosphere to form carbon nano-encapsules on a microsecond time at a very high pressure. The heat and the carbon species produced from the detonation promote the decomposition and the reduction of catalyst particle and this lead to help the size control. In the case of RDX/NiB detonation, the reaction generated products is rather complex because the carbon and boron spices related to nickel metal for nano-particle assembling are supplied at a different reaction conditions.
In this research, a laboratory self-heating process has been successfully designed and a more effective synthesis of carbon nano-materials using RDX energetic materials in relation to the catalysis-assisted detonation. This approach involving bottom-up nanotechnology is universal and low-cost, and especially it has the potential ability to convert waste energetic explosives to form highly valuable materials, as well as providing the suitable alternatives to reuse the energetic explosive further.
| Identifer | oai:union.ndltd.org:TW/095KYIT0566008 |
| Date | January 2007 |
| Creators | YUNG CHANG LIN, 林永昌 |
| Contributors | Y. H. Lin, 林岳輝 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 97 |
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