材料科学
空气过滤器
过滤(数学)
空气过滤
压力降
纳米纤维
复合材料
透气比表面积
纳米技术
硅酮
工艺工程
化学工程
室内空气质量
机械工程
环境工程
环境科学
入口
工程类
统计
物理
数学
图层(电子)
热力学
作者
Zhiqiang Zhou,Tianle You,Zhiyi Pan,Di Wang,Hao Wang,Lingyun Wang,Guanglong Xu,Yun Liang,Jian Hu,Min Tang
标识
DOI:10.1002/adma.202311129
摘要
Abstract Air pollution threats to human health have increased awareness of the role of filter units in air cleaning applications. As an ideal energy‐saving strategy for air filters, the slip effect on nanofiber surfaces can potentially overcome the trade‐off between filtration efficiency and pressure drop. However, the potential of the slip effect in nanofibrous structures is significantly limited by the tight nanofiber stacks. In this study, trichome‐like biomimetic (TLB) air filters with 3D‐templated silicone nanofilaments (average diameter: ≈74 nm) are prepared based on an in situ chemical vapor deposition (CVD) method inspired by plant purification. Theoretical modeling and experimental results indicate that TLB air filters make significant use of the slip effect to overcome the efficiency‐resistance tradeoff. The selectable filter class (up to U15, ≈99.9995%) allows TLB air filters to meet various requirements, and their integral filtration performance surpasses that of most commodity air filters, including melt‐blown cloth, ePTFE membranes, electrospun mats, and glass fiber paper. The proposed strategy directly transforms commercial filter media and filters into TLB air filters using a bottom‐up, one‐step approach. As a proof‐of‐concept, reusable N95 respirators and air purifiers equipped with TLB air filters are fabricated, overcoming the limitations of existing filter designs and fabrication methods.
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