Zhu Wenqi, Guo Xingzhong, Wu Lan, Yang Hui
Zhejiang-California International Nanosystems Institute, Zhejiang University, Hangzhou 310058, China.
School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Materials (Basel). 2020 Apr 1;13(7):1635. doi: 10.3390/ma13071635.
This paper focuses on the light transmittance of macroporous silica as a photocatalyst carrier. In addition to the characteristics of photocatalysts, the structure of porous bulk is also important since it affects the propagation of light. Realistic porous structures are generated by a Voronoi-based approach. Four morphological parameters are highly controlled during generating, that is, porosity, coefficient of variation, diameter ratio and normalized curvature. Finite element method (FEM) is used to simulate the propagation of light in the porous models in the visible light range. The intensity shows a quadratic decrease with the increase of the depth of light propagation. The influences of the morphological parameters on the light transmittance are analysed. It turns out that the porosity has a great influence on the light transmittance while the coefficient of variation and the diameter ratio have small ones. Moreover, the influence of the normalized curvature is little. Besides, the effect of the wavelength of visible light can not be ignored. With the simulation, the depth of visible light entering the porous silica can be estimated, which is challenging to access experimentally.
本文聚焦于大孔二氧化硅作为光催化剂载体的光透射率。除了光催化剂的特性外，多孔体的结构也很重要，因为它会影响光的传播。通过基于Voronoi的方法生成实际的多孔结构。在生成过程中高度控制四个形态参数，即孔隙率、变异系数、直径比和归一化曲率。采用有限元法（FEM）模拟可见光范围内多孔模型中的光传播。光强随光传播深度的增加呈二次方下降。分析了形态参数对光透射率的影响。结果表明，孔隙率对光透射率有很大影响，而变异系数和直径比对光透射率的影响较小。此外，归一化曲率的影响很小。此外，可见光波长的影响也不容忽视。通过模拟，可以估计可见光进入多孔二氧化硅的深度，这在实验上很难实现。
