Malloy James, Marlowe Erin, Jensen Christopher J, Liu Isaac S, Hulse Thomas, Murray Anne F, Bryan Daniel, Denes Thomas G, Gilbert Dustin A, Yin Gen, Liu Kai
Department of Physics, Georgetown University, Washington, DC 20057, USA.
Department of Computer Science, Vanderbilt University, Nashville, TN 37235, USA.
Nanoscale. 2024 Aug 15;16(32):15094-15103. doi: 10.1039/d4nr02368d.
The COVID-19 pandemic has shown the urgent need for the development of efficient, durable, reusable and recyclable filtration media for the deep-submicron size range. Here we demonstrate a multifunctional filtration platform using porous metallic nanowire foams that are efficient, robust, antimicrobial, and reusable, with the potential to further guard against multiple hazards. We have investigated the foam microstructures, detailing how the growth parameters influence the overall surface area and characteristic feature size, as well as the effects of the microstructures on the filtration performance. Nanogranules deposited on the nanowires during electrodeposition are found to greatly increase the surface area, up to 20 m g. Surprisingly, in the high surface area regime, the overall surface area gained from the nanogranules has little correlation with the improvement in capture efficiency. However, nanowire density and diameter play a significant role in the capture efficiency of PM particles, as do the surface roughness of the nanowire fibers and their characteristic feature sizes. Antimicrobial tests on the Cu foams show a >99.9995% inactivation efficiency after contacting the foams for 30 seconds. These results demonstrate promising directions to achieve a highly efficient multifunctional filtration platform with optimized microstructures.
新冠疫情表明，迫切需要开发适用于深亚微米尺寸范围的高效、耐用、可重复使用和可回收的过滤介质。在此，我们展示了一种使用多孔金属纳米线泡沫的多功能过滤平台，该平台高效、坚固、具有抗菌性且可重复使用，有可能进一步防范多种危害。我们研究了泡沫微观结构，详细说明了生长参数如何影响总表面积和特征尺寸，以及微观结构对过滤性能的影响。发现在电沉积过程中沉积在纳米线上的纳米颗粒可大幅增加表面积，高达20 m²/g。令人惊讶的是，在高表面积状态下，纳米颗粒增加的总表面积与捕获效率的提高几乎没有关联。然而，纳米线密度和直径在PM颗粒的捕获效率中起着重要作用，纳米线纤维的表面粗糙度及其特征尺寸也是如此。对铜泡沫进行的抗菌测试表明，与泡沫接触30秒后，灭活效率>99.9995%。这些结果为实现具有优化微观结构的高效多功能过滤平台指明了有前景的方向。
