Comments on pattern formation in precipitation processes
Comments on pattern formation in precipitation processes
复制标题
对降水过程中模式形成的评论
DOI：
10.1063/1.443953
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
J. Ross
中科院分区：
文献类型：
--
作者：
G. Venzl;J. Ross
与Ostwald的过饱和(成核前)理论不同，我们研究了沉淀体系中空间花样形成的不稳定性理论，它侧重于后成核现象。标度分析表明，为了与实验观测结果相匹配，需要非常缓慢的颗粒生长动力学；这一结果排除了胶体颗粒的扩散限制生长。我们进一步证明，胶体粒子扩散对于结构形成过程在数量上并不重要，并且不能为扩散限制生长动力学提供宏观的长度尺度。
We investigate the instability theory of spatial pattern formation in precipitating systems which focuses on post‐nucleation phenomena in contrast to the supersaturation (prenucleation) theory of Ostwald. A scale analysis shows that very slow particle growth kinetics are necessary to match the experimental observations; this result rules out diffusion limited growth of colloidal particles. We further show that colloidal particle diffusion is quantitatively unimportant for the process of structure formation and does not provide a macroscopic length scale for diffusion limited growth kinetics.