Functionalized Double-Gradient Janus Filters for Full-Scale Capture and Inactivation of Multiscale Aqueous Bioaerosols,Advanced Functional Materials

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Functionalized Double-Gradient Janus Filters for Full-Scale Capture and Inactivation of Multiscale Aqueous Bioaerosols
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-04-18 , DOI: 10.1002/adfm.202402969
Zhiqiang Zhou ₁ , Di Wang ₁ , Tianle You ₁ , Zhengyuan Pan ₂ , Guilong Xu ₁ , Yun Liang ₁ , Min Tang ₁

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Exposure to bioaerosols can result in severe infection and even death, prompting the development of numerous air filters to capture and inactivate bioaerosols. Although the wettability of filter media determines its bioaerosol-capture efficiency, the dynamic collision behavior of multiscale aqueous bioaerosols on most filter media is poorly understood. A double-gradient Janus paper (Janus paper) with a pore-size gradient, asymmetric wettability, and biocidal and bioadhesion properties is fabricated in this study using an industrially available papermaking process. The dynamic collision behavior at the micrometer and millimeter scales indicates that the Janus paper enables the full-scale blocking and/or capture of aqueous aerosols by a two-step mechanism where the water-repellent top layer blocks large-size aqueous aerosols, while the hydrophilic bottom layer permits the adherence of small-size aerosols to its fibers. The Janus paper exhibits a higher capture and inactivation capacity (inactivation efficiency: 98.3%), better dust-holding capacity (> 21 g m⁻²), and a longer lifetime than commercial filter media. Commercial air purifiers comprising the Janus paper exhibit high potential for large-scale commercial applications owing to the facile, low-cost, and scalable fabrication method. This study enables future research on efficient and practicable Janus-paper filter media.

中文翻译：

用于全面捕获和灭活多尺度水性生物气溶胶的功能化双梯度 Janus 过滤器

接触生物气溶胶会导致严重感染甚至死亡，这促使人们开发出多种空气过滤器来捕获和灭活生物气溶胶。尽管过滤介质的润湿性决定了其生物气溶胶捕获效率，但对大多数过滤介质上多尺度水性生物气溶胶的动态碰撞行为知之甚少。本研究采用工业上可用的造纸工艺制造了具有孔径梯度、不对称润湿性以及杀菌和生物粘附特性的双梯度 Janus 纸（Janus 纸）。微米和毫米尺度的动态碰撞行为表明，Janus 纸能够通过两步机制全面阻挡和/或捕获水性气溶胶，其中防水顶层阻挡大尺寸水性气溶胶，而亲水底层允许小尺寸气溶胶粘附在其纤维上。与商用过滤介质相比，Janus纸表现出更高的捕获和灭活能力（灭活效率：98.3%）、更好的容尘能力（> 21 gm ^-2 ）和更长的使用寿命。由于简单、低成本和可扩展的制造方法，包含 Janus 纸的商用空气净化器在大规模商业应用中表现出巨大的潜力。这项研究使得未来对高效实用的 Janus 纸过滤介质的研究成为可能。

更新日期：2024-04-18

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