J Air Waste Manag Assoc. 2014 Mar;64(3):322-9. doi: 10.1080/10962247.2013.858652.
Electrospinning is a simple and versatile process to produce polymer nanofibers, which are useful for ultrafine particle filtration. In this study, a polyurethane filter with an average fiber diameter of 150-250 nm was prepared through the electrospinning process and its filtration characteristics were investigated. We found that the electrospun fiber diameter was highly dependent on the polyurethane concentration, electric field, and tip-to-collector distance. As the polyurethane concentration, electric field, and tip-to-collector distance under the same electric field increased, the fiber diameter increased. We also found that the produced filter media had a minimum collection efficiency at particles sizes from 80 to 100 nm, which implies an electrostatic attraction between the filter and the test particles. Furthermore, we observed that interception was a predominant collection mechanism at Peclet numbers higher than 10 in nanofiber filtration for ultrafine particles.
A polyurethane nanofiber filter with excellent mechanical properties was prepared, and the effect of operating conditions on fiber morphology was examined. The filter fabricated by an electrospinning process is charged and has high filtration efficiency due to electrostatic force. Therefore, it can be a good alternative to control hazardous ultrafine particles.
静电纺丝是一种简单而通用的生产聚合物纳米纤维的方法，这些纤维对于超细微粒过滤非常有用。在这项研究中，通过静电纺丝工艺制备了平均纤维直径为 150-250nm 的聚氨酯过滤器，并研究了其过滤特性。我们发现，静电纺丝纤维的直径高度依赖于聚氨酯浓度、电场和针尖到收集器的距离。随着同一电场下聚氨酯浓度、电场和针尖到收集器距离的增加，纤维直径也增加。我们还发现，所制备的过滤介质在粒径为 80-100nm 时具有最小的收集效率，这意味着过滤器和测试颗粒之间存在静电吸引力。此外，我们观察到，在纳米纤维过滤中超细颗粒的 Peclet 数高于 10 时，拦截是主要的收集机制。
制备了具有优异机械性能的聚氨酯纳米纤维过滤器，并研究了操作条件对纤维形态的影响。由于静电力的作用，通过静电纺丝工艺制备的过滤器会带电，并且具有较高的过滤效率。因此，它可能是控制危险超细颗粒的一种很好的选择。
