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首页> 外文期刊>RSC Advances >Hierarchical carbon-nanotube/quartz-fiber films with gradient nanostructures for high efficiency and long service life air filters
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Hierarchical carbon-nanotube/quartz-fiber films with gradient nanostructures for high efficiency and long service life air filters

机译：具有梯度纳米结构的分层碳纳米管/石英纤维膜，可实现高效率和长使用寿命的空气过滤器

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Hierarchical and gradient nanostructures are important to exploit the full potential of nanofibers in filtration applications. The introduction of a gradient into carbon nanotube (CNT)/fiber hierarchical structures could result in a change of the particle capturing properties. Here, we show the fabrication of hierarchical carbon nanotube (CNT)/quartz-fiber (QF) filters with gradient nanostructures where the content of CNTs decreases exponentially along the thickness direction of the filters. The loading of catalysts for the growth of CNTs in the QF filter has been achieved using an aerosol technique, which can be carried out on a large-scale. With only 1.17 wt% CNT, the penetration of the CNT/QF filter at the most penetrating particle size (MPPS) has been reduced by one order of magnitude, while the pressure drop only increases about 6% with respect to that of the pristine QF filter, leading to an obvious higher quality factor (Q(f)) for the CNT/QF filter. More importantly, the service life of the CNT/QF filter with the CNT-rich side downstream has increased by 64% when compared with the pristine QF filter. In contrast, when the CNT-rich side is placed upstream, the service life of CNT/QF filter is only 41.7% of that observed when placing the CNT-rich side downstream. Scanning electron microscopy (SEM) images reveal that the gradient nanostructure of the CNT/QF filter, together with the CNT/QF hierarchical structure play very important roles in the simultaneous enhancement of the filtration efficiency and the service life of the air filters.
机译：分层和梯度纳米结构对于充分发挥纳米纤维在过滤应用中的潜力很重要。将梯度引入碳纳米管（CNT）/纤维分层结构可能会导致粒子捕获特性发生变化。在这里，我们展示了具有梯度纳米结构的分层碳纳米管（CNT）/石英纤维（QF）过滤器的制造，其中CNT的含量沿过滤器的厚度方向呈指数下降。使用气溶胶技术已经实现了在QF过滤器中装载用于CNT生长的催化剂，该技术可以大规模实施。仅使用1.17 wt％的CNT，在最穿透的粒径（MPPS）下，CNT / QF过滤器的渗透率降低了一个数量级，而相对于原始QF而言，压降仅增加了约6％。滤波器，从而明显提高了CNT / QF滤波器的品质因数（Q（f））。更重要的是，与原始QF过滤器相比，具有富CNT侧下游的CNT / QF过滤器的使用寿命增加了64％。相反，当将富CNT的一面放在上游时，CNT / QF过滤器的使用寿命仅为将富CNT的一面放在下游时的41.7％。扫描电子显微镜（SEM）图像显示，CNT / QF过滤器的梯度纳米结构以及CNT / QF分层结构在同时提高空气过滤器的过滤效率和使用寿命方面起着非常重要的作用。

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