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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
energyE
a; and that the top-temperature of decompositionT
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 bothE
a andT
p to decline sharply with the decrease of the average diameter of nano-particles.
Project supported by Guizhou Province Natural Science Foundation of China 相似文献
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INTRODUCTIONTherearefewofquantitativethermalanalysis(TA)investigations (Mulokozi,1992 )ofthegoverningrelationsbetweentheparametersofsolidphasereactionkineticsandtheaveragedi ametersofultrafinecalciumcarbonateandtheeffectsoffineparticlesontheirsolidphasere… 相似文献
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