Beatriz Suárez-Peña, Luis Negral, Leonor Castrillón, Laura Megido, Elena Marañón, Yolanda Fernández-Nava
Department of Materials Science and Metallurgical Engineering, Polytechnic School of Engineering, Gijón Campus, University of Oviedo, 33203 Gijón, Spain.
Department of Chemical and Environmental Engineering, University Institute of Industrial Technology of Asturias, Gijón Campus, University of Oviedo, 33203 Gijón, Spain.
Materials (Basel). 2016 Feb 11;9(2):109. doi: 10.3390/ma9020109.
This paper presents a study of the quartz fibrous filters used as a substrate for capturing the particulate matter (PM) present in the air. Although these substrates are widely used in environmental applications, their microstructure has been barely studied. The behavior of these devices during the filtration process was investigated in terms of their microstructure and the quartz fibers. Surface and cross sections were monitored. Scanning electronic microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), imaging and stereology techniques were used as tools for this purpose. The results show that most of the quartz filter fibers have sizes that allow them to be classified as nanofibers. It was also observed that, while the mechanisms of the mechanical capture of particles via impaction, interception and diffusion operate simultaneously in the outer zones of the filter cross section, the mechanism of capture by impaction is virtually non-existent in the innermost zones. Particles between 0.1 and 0.5 μm are known to be the most difficult to have captured by means of fibrous substrates. The fibers in inner zones were highly efficient in capturing this type of particle.
本文介绍了一项关于用作捕获空气中存在的颗粒物（PM）的基质的石英纤维过滤器的研究。尽管这些基质在环境应用中被广泛使用，但其微观结构几乎未被研究。从这些装置的微观结构和石英纤维方面对其在过滤过程中的行为进行了研究。监测了表面和横截面。为此使用了带有能量色散X射线光谱的扫描电子显微镜（SEM-EDX）、成像和体视学技术作为工具。结果表明，大多数石英过滤纤维的尺寸使其可被归类为纳米纤维。还观察到，虽然通过撞击、拦截和扩散进行颗粒机械捕获的机制在过滤器横截面的外部区域同时起作用，但在最内部区域几乎不存在通过撞击进行捕获的机制。已知0.1至0.5μm之间的颗粒最难通过纤维基质捕获。内部区域的纤维在捕获这类颗粒方面效率很高。
