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Vahid Fahimpour |
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Master Graduate of Materials Science and Engineering |
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Research Projects M.Sc. Thesis |
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Title: Synthesis of Magnesium Nanoparticles With Ball Mill Supervisor: Professor S.K Sadrnezhaad Grade: 20/20 Abstract: In recent years magnesium nanoparticles due to their noticeable differences from bulk and their wide applications in various branches including the ability to absorb hydrogen, application in batteries, activation of propellant, different applications in biochemistry and strengthening secondary phase in composites, are well under investigation. The objective of this study is to find an easy, economical and high purity method to obtain magnesium nanoparticles and to introduce an innovative approach of magnesium nanoparticles synthesis in an industrial scale. To achieve this goal, milling process is applied. Micron-sized magnesium powders with different amounts of sodium chloride salt powders were used in the process. Specimens were designed using 0%, 30%, 60% and 80% salt and milling was performed at 250 rpm and ball to powder ratio of 10:1. Milling was conducted at different times from 0 to 50 hours and the effect of time and salt concentration on powder size was investigated. To characterize the obtained powders, SEM, XRD, TEM, DSC and sivert analysis were used. Eventually the specimen with 10% wt. salt concentration and 50 hours of milling was selected as the optimum in which sizes of powders were about 17 nanometers. Continue for this work: Thermal analysis results in presence of ammonium perchlorate showed that little amounts of magnesium drastically reduce the decomposition temperature of ammonium perchlorate and increase the amount of the released heat during this process. This effect was even more noticeable when using nanoscale magnesium particles. Absorption and release of hydrogen in sivert analysis revealed that micron-sized magnesium resulted in maximum 2.2% hydrogen absorption, while this was 4.7% when magnesium nanoparticles were used. Publications:
2. V. Fahimpour and S.K. Sadrnezhaad, Breakage mechanism during ball milling of Mg for nanopowder production ( Accepted in Metallurgical and Materials Transaction B)
Conference papers: 1. V. Fahimpour and S.K. Sadrnezhaad, Synthesis and characterization of magnesium nanoparticles, 5th Joint Conference of Iranian Metallurgical Engineers Society and Iranian Foundry men’s Society, Iran, 2011. 2. V. Fahimpour and S.K. Sadrnezhaad, Effect of magnesium nanoparticles on ammonium perchlorate activation, The 1th conference of Iranian Aircraft Structure Integrity Program, Iran, 2011.
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M.Sc. Thesis |
contact:Vahid.fahimpour@gmail.com |
