过渡金属二硫化物基纳米材料中溶剂扩散的数值建模
Numerical Modeling of Solvent Diffusion through the Transition Metal Dichalcogenides based Nanomaterials
AI总结：
本文通过改进的菲克扩散定律和动态键渗透模型，研究了溶剂扩散对纳米颗粒层剥离及尺寸变化的影响，揭示了扩散率和迭代次数对纳米颗粒均匀性的作用机制。
摘要：
本文提出了过渡金属二硫化物基纳米材料中溶剂扩散的数值模拟，旨在研究溶热反应过程中层剥离及纳米颗粒尺寸减少的现象。通过求解改进的菲克扩散定律并利用动态键渗透模型，研究了纳米颗粒系统的演变。在模拟过程中，分析了关键参数，如决定扩散速率的扩散率变量以及达到增强纳米颗粒尺寸均匀性所需的迭代次数。为了更深入理解纳米颗粒尺寸的演变，利用了雪崩统计和香农熵波动分析。研究了不同扩散率变量和迭代次数下的尺寸分布，预测了系统中特定尺寸纳米颗粒出现的概率。建立了最大熵迭代与粒子尺寸相对变化最小值之间的相关性，表明存在使系统趋于纳米颗粒平均尺寸饱和的迭代次数。数值结果表明，实验参数如溶剂选择性、扩散率和反应时间在确定纳米颗粒尺寸和均匀性方面起重要作用，从而提升潜在材料应用。
英文摘要：
This article presents a numerical simulation of solvent diffusion in transition metal dichalcogenide based nanomaterials during solvothermal reaction, leading to layer exfoliation and, consequently, a reduction in the average nanoparticle size. By solving modified Ficks law of diffusion and utilizing the dynamic bond percolation model, this study examines the evolution of a system of nanoparticles. During the simulation, the effects of key parameters, such as the diffusivity variable that determines the diffusion rate, and the number of iterations needed to achieve enhanced nanoparticle size uniformity, have been analyzed. To gain more insight into the size evolution of the nanoparticles, avalanche statistics, and fluctuations in the average nanoparticle size by Shannon entropy has been utilized. The size distribution observed for different diffusivity variables and iterations has also been studied, which predicts the probability of finding the nanoparticles of specific sizes within the system. A correlation between the iteration for maximum entropy and the minimum of relative change in particle size with iteration has been established, indicating that an iteration exists that takes the system towards saturation in terms of the average size of the nanoparticles. The numerical findings indicate that the experimental parameters, such as solvent selectivity and diffusivity, as well as reaction time, play significant roles in determining nanoparticle size and uniformity, thereby enhancing potential material applications.
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