Thermodynamics and Characteristics of Heterogeneous Nucleation on Fractal Surfaces
Thermodynamics and Characteristics of Heterogeneous Nucleation on Fractal Surfaces
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分形表面异质成核的热力学及特性
DOI：
10.1021/acs.jpcc.5b07709
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发表时间：
2015
影响因子：
3.7
通讯作者：
徐世烺
中科院分区：
文献类型：
--
作者：
曾强;徐世烺
阐明分形表面上的非均质形核过程对于理解其热力学原理和推进工程应用具有重要意义。我们建立了一个热力学模型来描述在分形表面上形成晶体或滴胚的过程以及相应的特征参数。我们发现，分形表面上的胚胎的临界尺寸和那些在平面上的差异是可以忽略不计的疏水核，但成为显着的亲水核。首次给出了形成临界胚的有效区域，并得到了临界胚的形状函数。结果也恢复了文献中报道的数据。最后，我们提出了可能的机制消失的能量障碍，对形成的临界胚胎的分形表面上的表观接触角是相对较小的。所获得的结果可能有助于工程师的形核过程中设计的分形结构的衬底表面。
Clarifying heterogeneous nucleation process on fractal surfaces is an important issue to understand its thermodynamic principles and forward the engineering aspects. We developed a thermodynamic model to capture the process of forming a crystal or drop embryo on fractal surfaces and the corresponding characteristic parameters. We showed that the differences between the critical size of the embryos on the fractal surfaces and those on the flat surfaces are negligible for the hydrophobic nuclei, but become significant for the hydrophilic nuclei. We reported the available domains of forming the critical embryos and obtained the shape function for the first time. The results also recover the data reported in the literature. Finally, we present the possible mechanisms of vanishing of the energy barriers against forming the critical embryos on the fractal surfaces as the apparent contact angle is relatively small. The obtained results may help to engineer the nucleation process by designing substrate surfaces in a fractal structure.