- 期刊
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
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)。
關鍵字
無資料並列摘要
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).
延伸閱讀
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