Buchsbaum Julia, Ranis Stephan, Angelow Krassimir, Linden Sven, Tegenkamp Christoph, Goedel Werner A
Physical Chemistry, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, Germany.
Math2Market, Richard-Wagner-Straße 1, 67655 Kaiserslautern, Germany.
Langmuir. 2021 Feb 16;37(6):2040-2055. doi: 10.1021/acs.langmuir.0c02936. Epub 2021 Feb 1.
This article shows a new way to produce hierarchical microsieves by layering three types of float-cast microsieves, differing from each other in their pore diameters (approximately 68 μm, 7 μm, and 0.24 μm) on top of each other. The unsupported microsieves with 7 and 0.24 μm pore sizes are mechanically fragile. The complete hierarchical sieve composed of all three layers, however, can be handled manually without special precaution. This article further investigates the flow through the hierarchical sieve and filtration via experiment, theory (Hagen-Poiseuille's and Sampson-Roscoe's law), and simulation (numerically solving the Navier-Stokes equations for a predefined set of discrete volumetric elements). The experimental, theoretical, and simulated permeances of the microsieves and the hierarchical sieves are in reasonable agreement with each other and are significantly higher than the permeances of conventional filtration media. In filtration experiments, the hierarchical sieves show the expected sharp size cut-off, retaining particles of diameters exceeding the pore diameter.
本文展示了一种通过将三种孔径不同（分别约为68μm、7μm和0.24μm）的浮法铸造微筛相互叠加来制造分级微筛的新方法。孔径为7μm和0.24μm的无支撑微筛在机械性能上较为脆弱。然而，由所有三层组成的完整分级筛可以手动处理，无需特别小心。本文还通过实验、理论（哈根 - 泊肃叶定律和桑普森 - 罗斯科定律）以及模拟（针对一组预定义的离散体积单元数值求解纳维 - 斯托克斯方程）进一步研究了通过分级筛的流动和过滤情况。微筛和分级筛的实验、理论及模拟渗透率相互之间具有合理的一致性，并且显著高于传统过滤介质的渗透率。在过滤实验中，分级筛显示出预期的尖锐尺寸截止，能够截留直径超过孔径的颗粒。
