WHAT I HAVE LEARNED 3. Fill in the blanks. 1. is a collection of well-defined distinct objects. are the members of the given set. is the number of distinct or well- defined elements in a given set. 4. Set A is a of set B, if and only if every element of set A is also an element of set B. is a set which contains all the elements of the other given sets. 6. is a set which does not contain any element. 5.
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Review Article | Open Access
Volume 2020 |Article ID 7286735 | https://doi.org/10.34133/2020/7286735
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Face Masks in the New COVID-19 Normal: Materials, Testing, and Perspectives
Ming Hui Chua ,1 Weiren Cheng ,1 Shermin Simin Goh ,1 Junhua Kong ,1 Bing Li,1 Jason Y. C. Lim ,1 Lu Mao ,1 Suxi Wang,1 Kun Xue,1 Le Yang ,1 Enyi Ye,1 Kangyi Zhang 1 et al.
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Published
07 Aug 2020
Abstract
The increasing prevalence of infectious diseases in recent decades has posed a serious threat to public health. Routes of transmission differ, but the respiratory droplet or airborne route has the greatest potential to disrupt social intercourse, while being amenable to prevention by the humble face mask. Different types of masks give different levels of protection to the user. The ongoing COVID-19 pandemic has even resulted in a global shortage of face masks and the raw materials that go into them, driving individuals to self-produce masks from household items. At the same time, research has been accelerated towards improving the quality and performance of face masks, e.g., by introducing properties such as antimicrobial activity and superhydrophobicity. This review will cover mask-wearing from the public health perspective, the technical details of commercial and home-made masks, and recent advances in mask engineering, disinfection, and materials and discuss the sustainability of mask-wearing and mask production into the future.
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