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首页> 外文期刊>European Physical Journal Plus >Size dependence of the thermal decomposition kinetics of nano-CaC2O4: A theoretical and experimental study
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Size dependence of the thermal decomposition kinetics of nano-CaC2O4: A theoretical and experimental study

机译：纳米CaC2O4热分解动力学的尺寸依赖性：理论和实验研究

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摘要

In the processes of preparation and application of nanomaterials, the thermal decomposition of nanoparticles is often involved. An improved general theory of thermal decomposition kinetics of nanoparticles, developed over the past 10 years, was presented in this paper where the relations between reaction kinetic parameters and particle size were derived. Experimentally, the thermal decomposition kinetics of nano-sized calcium oxalate (nano-CaC2O4) with different sizes was studied by means of Thermogravimetry Analysis (TGA) at different heating rates. The values of the apparent activation energy and the logarithm of pre-exponential factor were calculated using the equation of Iterative Kissinger-Akahira-Sunose (IKAS) and its deformations. The influence regularities of particle size on the apparent activation energy and the pre-exponential factor were summarized, which are consistent with the thermal decomposition kinetics theory of nanoparticles. Based on the theory, the method of obtaining the surface thermodynamic properties by the determination of kinetic parameters was presented. Theoretical and experimental results show that the particle size, through the effect on the surface thermodynamic properties, has notable effect on the thermal decomposition kinetics. With the particle size decreasing, the partial molar surface enthalpy and the partial molar surface entropy increases, leading to the decrease of the apparent activation energy and the pre-exponential factor, respectively. Furthermore, the apparent activation energy, the pre-exponential factor, the partial molar surface enthalpy and the partial molar surface entropy are linearly related to the reciprocal of particle diameter, respectively.
机译：在纳米材料的制备和应用过程中，经常涉及纳米颗粒的热分解。本文介绍了近十年来发展起来的一种改进的纳米粒子热分解动力学通用理论，推导了反应动力学参数与粒径之间的关系。实验上，通过热重分析（TGA）在不同的加热速率下研究了不同尺寸的纳米级草酸钙（nano-CaC2O4）的热分解动力学。使用迭代基辛格-赤平-Sunose（IKAS）方程及其变形来计算表观活化能和前指数因子的对数。总结了粒径对表观活化能和指数前因子的影响规律，这与纳米粒子的热分解动力学理论相吻合。基于该理论，提出了通过确定动力学参数获得表面热力学性质的方法。理论和实验结果表明，粒径通过影响表面热力学性质，对热分解动力学有显着影响。随着粒径的减小，部分摩尔表面焓和部分摩尔表面熵增加，分别导致表观活化能和指数前因子的减小。此外，表观活化能，预指数因子，部分摩尔表面焓和部分摩尔表面熵分别与粒径的倒数线性相关。

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