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題 名 | Oxidation Kinetics of Nickel Nanoparticles from Chemical Reduction Method=化學還原法製備之奈米鎳微粒氧化動力學研究 |
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作 者 | 周更生; 黃國政; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 34:5 2003.09[民92.09] |
頁 次 | 頁595-598 |
分類號 | 460.02 |
關鍵詞 | 化學還原法; 奈米鎳微粒; 氧化動力學; Oxidation kinetics; Nickel; Nanoparticles; Activation energy; |
語 文 | 英文(English) |
中文摘要 | 本研究以化學選原法製備粒徑大約15.5nm之奈米級鎳微粒,並以TGA與XRD兩種方法觀其在280~350℃溫度下的氧化行為。這兩種方法所得到的結果互相吻合,並顯示此氧化機制十分接近於灰殼擴散控制機制。由不同溫度下的氧化速率數據,我們得到其反應活化能為32.4 kcal/mol,而反應速率常數之Arrhenius表示式如下:k(cm²/s)=9.33×10^-5exp(-32.4(kcal/mol) /RT)。 |
英文摘要 | The oxidation kinetics of nickel nanoparticles having an approximate mean diameter of 15.5 nm was studied here. Conversion data were derived from both thermogravimetric analysis (TGA) and X-ray diffraction (XRD) analysis in the temperature range of 280~350℃. The results were consistent with each other and found to be modeled well by the equation based on core-shell diffusion controlled kinetics. Oxidation rate constant of nickel nanoparticles were fitted for these temperatures and its activation energy was found to be about 32.4 kcal/mol. The resulting Arrhenius expression of rate constant is k(cm²/s)=9.33×10^-5exp(-32.4(kcal/mol)/RT). |
本系統中英文摘要資訊取自各篇刊載內容。