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    Flexible Nanoporous Template for the Design and Development of Reusable Anti-COVID-19 Hydrophobic Face Masks

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    Name:
    Flexible.pdf
    Size:
    5.142Mb
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    PDF
    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Elatab, Nazek cc
    Qaiser, Nadeem cc
    Badghaish, Huda cc
    Shaikh, Sohail F. cc
    Hussain, Muhammad Mustafa cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering
    Electrical Engineering Program
    Integrated Nanotechnology Lab
    KAUST Grant Number
    OSR-2015-Sensors-2707
    OSR-2016-KKI-2880.
    Date
    2020-05-20
    Online Publication Date
    2020-05-20
    Print Publication Date
    2020-06-23
    Embargo End Date
    2021-05-20
    Submitted Date
    2020-05-12
    Permanent link to this record
    http://hdl.handle.net/10754/662934
    
    Metadata
    Show full item record
    Abstract
    Since the outbreak of the severe respiratory disease caused by the novel coronavirus (COVID-19), the use of face masks has become ubiquitous worldwide to control the rapid spread of this pandemic. As a result, the world is currently facing a face mask shortage, and some countries have placed limits on the number of masks that can be bought by each person. Although the surgical grade N95 mask provides the highest level of protection currently available, its filtration efficiency for sub-300 nm particles is around 85% due to its wider pore size (∼300 nm). Because the COVID-19 virus shows a diameter of around 65-125 nm, there is a need for developing more efficient masks. To overcome these issues, we demonstrate the development of a flexible, nanoporous membrane to achieve a reusable N95 mask with a replaceable membrane and enhanced filtration efficiency. We first developed a flexible nanoporous Si-based template on a silicon-on-insulator wafer using KOH etching and then used the template as a hard mask during a reactive ion etching process to transfer the patterns onto a flexible and lightweight (<0.12 g) polymeric membrane. Pores with sizes down to 5 nm were achieved with a narrow distribution. Theoretical calculations show that airflow rates above 85 L/min are possible through the mask, which confirms its breathability over a wide range of pore sizes, densities, membrane thicknesses, and pressure drops. Finally, the membrane is intrinsically hydrophobic, which contributes to antifouling and self-cleaning as a result of droplets rolling and sliding on the inclined mask area.
    Citation
    El-Atab, N., Qaiser, N., Badghaish, H., Shaikh, S. F., & Hussain, M. M. (2020). Flexible Nanoporous Template for the Design and Development of Reusable Anti-COVID-19 Hydrophobic Face Masks. ACS Nano. doi:10.1021/acsnano.0c03976
    Sponsors
    This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. Sensor Innovation Initiative OSR-2015-Sensors-2707 and KAUSTKFUPM Special Initiative OSR-2016-KKI-2880. The authors would like to acknowledge Prof. Aftab Hussain, Prof. Jhonathan Prieto Rojas, and Dr. Galo Torres Sevilla and Maurilio Matracia who have worked on the release of the template.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Nano
    DOI
    10.1021/acsnano.0c03976
    PubMed ID
    32432461
    PubMed Central ID
    PMC7243426
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsnano.0c03976
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsnano.0c03976
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Integrated Nanotechnology Lab; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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