Barták Jaroslav, Málek Jirí, Bagchi Kushal, Ediger M D, Li Yuhui, Yu Lian
Department of Physical Chemistry, University of Pardubice, Studentská 573, 53210 Pardubice, Czech Republic.
Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
J Chem Phys. 2021 Feb 21;154(7):074703. doi: 10.1063/5.0041273.
Surface diffusion is important for a broad range of chemical and physical processes that take place at the surfaces of amorphous solids, including surface crystallization. In this work, the temporal evolution of nanoholes is monitored with atomic force microscopy to quantify the surface dynamics of amorphous selenium. In molecular glasses, the surface diffusion coefficient has been shown to scale with the surface crystal growth rate (u) according to the power relation u ≈ D . In this study, we observe that the same power law applies to surface crystallization of amorphous selenium, a representative inorganic polymer glass. Our study shows that the surface diffusion coefficient can be used to quantitatively predict surface crystallization rates in a chemically diverse range of materials.
表面扩散对于发生在非晶态固体表面的广泛化学和物理过程（包括表面结晶）而言至关重要。在这项工作中，利用原子力显微镜监测纳米孔的时间演变，以量化非晶态硒的表面动力学。在分子玻璃中，表面扩散系数已被证明根据幂律关系u≈D与表面晶体生长速率（u）成比例。在本研究中，我们观察到相同的幂律适用于非晶态硒（一种代表性的无机聚合物玻璃）的表面结晶。我们的研究表明，表面扩散系数可用于定量预测多种化学材料中的表面结晶速率。
