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为解释固态基板上Ag纳米粒子液滴干燥过程中溶质的成膜机理并简化计算模拟过程,建立了一个二维理论模型,然后使用该模型,首先分析并模拟了稳定液滴的干燥成膜过程以及膜厚剖面,进而又分别模拟了较低成膜温度下喷打液滴以及较高成膜温度下液滴干燥后的成膜形貌。上述模拟结果与实验测得的膜厚剖面基本相符。理论分析和模拟结果表明,通过降低溶剂的蒸发速率,例如采用较低的成膜温度或者采用较高沸点的溶剂,可以有效的抑止“咖啡环”的产生。该研究对于喷墨打印成膜过程中成膜形貌的理解与控制具有重要意义。
In order to explain the formation mechanism of solute during the droplet drying of Ag nanoparticles on a solid substrate and to simplify the computational simulation process, a two-dimensional theoretical model was established. Then, the model was used to analyze and simulate the process of stable film formation As well as the film thickness profile, and then the film-forming topography of the droplet at the lower film-forming temperature and the droplet drying at a higher film-forming temperature were simulated respectively. The above simulation results basically agree with the measured film thickness profile. Theoretical analysis and simulation results show that the production of “coffee ring” can be effectively suppressed by reducing the evaporation rate of the solvent, for example, by using a lower film formation temperature or using a higher boiling point solvent. The research is of great significance for the understanding and control of the film-forming morphology during the ink-jet printing process.