| Study on the thermal decomposition kinetics of nano-sized calcium carbonate |
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| 引用本文： | 李代禧,史鸿运,邓洁,徐元植. Study on the thermal decomposition kinetics of nano-sized calcium carbonate[J]. Journal of Zhejiang University. Science. B, 2003, 0(3) |
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| 作者姓名： | 李代禧 史鸿运 邓洁 徐元植 |
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| 作者单位： | Chemistry Department，Guizhou University，Chemistry Department，Guizhou University，Chemistry Department，Guizhou University，Chemistry Department，Zhejiang University Guizhou 550025，China Chemistry Department，Zhejiang University，Hangzhou 310027，China，Guizhou 550025，China，Guizhou 550025，China，Hangzhou 310027，China |
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| 基金项目： | ProjectsupportedbyGuizhouProvinceNaturalScienceFoundationofChina |
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| 摘 要： | INTRODUCTIONTherearefewofquantitativethermalanalysis(TA)investigations (Mulokozi,1992 )ofthegoverningrelationsbetweentheparametersofsolidphasereactionkineticsandtheaveragedi ametersofultrafinecalciumcarbonateandtheeffectsoffineparticlesontheirsolidphasere…
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Study on the thermal decomposition kinetics of nano-sized calcium carbonate |
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| LI Dai xi,SHI Hong yun,DENG Jie,XU Yuan zhi[WT.,.BZ]. Study on the thermal decomposition kinetics of nano-sized calcium carbonate[J]. Journal of Zhejiang University. Science. B, 2003, 0(3) |
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| Authors: | LI Dai xi SHI Hong yun DENG Jie XU Yuan zhi[WT. .BZ] |
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| Affiliation: | LI Dai xi,SHI Hong yun,DENG Jie,XU Yuan zhi[WT9.,10.BZ] |
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| Abstract: | This study of the thermal decomposition kinetics of various average diameter nano particles of calcium carbonate by means of TG DTA(thermogravimetry and differential thermal analysis) showed that the thermal decomposition kinetic mechanisms of the same crystal type of calcium carbonate samples do not vary with decreasing of their average diameters; their pseudo active energy E a; and that the top temperature of decomposition T p decreases gently in the scope of micron sized diameter, but decreases sharply when the average diameter decreases from micron region to nanometer region. The extraordinary properties of nano particles were explored by comparing the varying regularity of the mechanisms and kinetic parameters of the solid phase reactions as well as their structural characterization with the variation of average diameters of particles. These show that the aggregation, surface effect as well as internal aberrance and stress of the nano particles are the main reason causing both E a and T p to decline sharply with the decrease of the average diameter of nano particles. |
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| Keywords: | Nano particle Aggregation Non isothermal kinetics Surface effect Phase interface reaction. |
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