Influence of Nonuniform Kinetics on Particle Aggregation

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• 作者：Bin Lin ; Radhakrishna Sureshkumar ; and John L. Kardos
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2002
• 出版时间：March 6, 2002
• 年：2002
• 卷：41
• 期：5
• 页码：1189 - 1194
• 全文大小：75K
• 年卷期：v.41,no.5(March 6, 2002)
• ISSN：1520-5045

文摘

Many pathways for the synthesis of novel materials involve aggregation processes that occur inthe presence of diffusion barriers and spatially nonuniform kinetics (i.e., the ratio of thetimescales of diffusion and reaction depends on the cluster size). In this study, we simulateclusters that grow by diffusion and spatially nonhomogeneous kinetics on two-dimensional squarelattices. The influence of nonuniform kinetics on the fractal dimension, particle densitydistribution, and average diffusion path length is investigated. It is found that if the simulationsare performed for a sufficiently long time, the fractal dimension and packing density are notsignificantly influenced. Specifically, the decrease in the fractal dimension and the increase inthe packing density as compared to their values in the case of diffusion-limited aggregation arerelatively small. However, the effective diffusion path length prior to attachment is significantlyenhanced, especially for smaller cluster sizes. The implications of these observations for particleaggregation processes are discussed.