【摘要】 针对吸附相反应技术制备CuO/SiO2的过程,构建了体系中反应物的扩散传递、反应、成核、生长等过程的模型,通过深入剖析过程的机理,对复杂的微分方程组进行解耦。在MATLAB平台上数值求解模型,得到了本体相、吸附相中各组分的浓度随时间的变化以及CuO粒子的生长过程,为深入了解过程的内在规律提供了依据。结果表明:吸附层中Cu(OH)2的浓度迅速上升然后趋于定值,而本体相中的Cu(OH)2浓度一直维持在很低的水平;结晶过程的成核时间短,且最后获得了粒径窄分布的小粒径粒子。更多还原

【Abstract】 Series of models were established for diffusion,reaction,nucleation and growth of the crystal in the system of CuO/SiO2 nanoparticle preparation by Adsorption Phase Reaction Technology(APRT).According to the analysis of mechanism,the complex differential equations were decoupled.The numerical solution procedure was calculated on MATLAB platform.The concentration of each component in both bulk phase and adsorption phase was simulated and the growth of CuO particles was obtained to support the basis for further exploring its inherent law.The investigation shows that the concentration of Cu(OH)2 increases rapidly before becoming a fixed value in adsorption phase,while in bulk phase the concentration maintains at a very low level all along.The nucleation time in the crystallization process was short,and the small particles with narrow size distribution were finally obtained.更多还原