期刊
JOURNAL OF CHEMICAL PHYSICS
卷 135, 期 4, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.3613674
关键词
crystallisation; diffusion barriers; fluctuations; nucleation
资金
- NSF [0955502]
- Direct For Mathematical & Physical Scien [0955502] Funding Source: National Science Foundation
- Division Of Chemistry [0955502] Funding Source: National Science Foundation
We model the coupling between slow diffusion transport and nucleation using the diffusion equation, an Ostwald-Freundlich boundary condition, and a mass balance linking nucleus size to flux across the nucleus-solution interface. The model retains some characteristics of the classical nucleation theory because of the common theoretical foundations behind classical nucleation theory and the Ostwald-Freundlich equation. For example, the classically critical-sized nucleus in the uniform supersaturated concentration field is an unstable equilibrium point. However, the model also shows that certain types of concentration profiles can drive a classically pre-critical nucleus over the nucleation barrier. We identify the separatrix as a function of both nucleus size and characteristics of the local concentration field. Our analysis may be useful for understanding the effects of local concentration fluctuations and especially for understanding the role of dense precursor particles in driving two-step nucleation processes. Our analysis may also provide a starting point for further statistical field theory analyses of local concentration fluctuations and their effects on nucleation rates. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3613674]
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据