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Research on the Carbon Nano Onions Synthesized by CVD

Author: ZhangChenGuang
Tutor: LiJiaJun
School: Tianjin University
Course: Materials Science
Keywords: Carbon nano - onions Ni-Fe Catalysts Chemical vapor deposition Magnetic properties Friction properties
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 43
Quote: 0
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Abstract


Carbon nano - onions ( CNOS ) Following the fullerene carbon nanotubes after another allotrope . The bent closed the graphite shell structure it has a unique self-lubricating properties , magnetic storage performance , chemical stability and good mechanical properties . Explore the preparation of well dispersed and uniform particle size CNOs synthesis process and to study its features, is of great significance for the development of CNOs range of applications . For the first time the co-precipitation method , reduction and reduction / replacement was prepared Ni-Fe composite catalyst carrier , Prepared by Reduction the carrier Ni-Fe/Al2O3 catalyst ; chemical vapor deposition method in the preparation of the catalyst synthesized on CNOS . System Ni and Fe molar ratio , catalyst content , reduction temperature , synthesis temperature and time , the type of carrier gas , CH4 carrier gas flow ratio of process parameters such as the impact on the the CNOs structure and morphology , and tested CNOs magnetic properties and be dispersed in the base lubricating oil friction properties . The results show that these methods are effective synthesis CNOS and catalyst -supported catalysts synthesized cNOS structure , morphology and degree of dispersion is superior to carrier . In the present experimental conditions , the use of the best the reduction method Ni-Fe/Al2O3 catalyst synthesis of the cNOS product structure and morphology . The CNOS having good magnetic properties , and will be dispersed in the lubricating base oil may play a significant antifriction effect . Reduction / substitution method in the gas flow rate of CH4 : H2 = 60 ml : 30 ml under the conditions of synthesis of the the cNOS magnetic storage performance better ; the CNOS dispersion in oil content is 0.15% , the friction properties is preferable .

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