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Title: Household Materials Selection for Homemade Cloth Face Coverings and Their Filtration Efficiency Enhancement with Triboelectric Charging

Abstract

The COVID-19 pandemic is currently causing a severe disruption and shortage in the global supply chain of necessary personal protective equipment (e.g., N95 respirators). The U.S. CDC has recommended use of household cloth by the general public to make cloth face coverings as a method of source control. We evaluated the filtration properties of natural and synthetic materials using a modified procedure for N95 respirator approval. Common fabrics of cotton, polyester, nylon, and silk had filtration efficiency of 5–25%, polypropylene spunbond had filtration efficiency 6–10%, and paper-based products had filtration efficiency of 10–20%. An advantage of polypropylene spunbond is that it can be simply triboelectrically charged to enhance the filtration efficiency (from 6 to >10%) without any increase in pressure (stable overnight and in humid environments). Using the filtration quality factor, fabric microstructure, and charging ability, we are able to provide an assessment of suggested fabric materials for homemade facial coverings.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [5];  [6]; ORCiD logo [7]
  1. 4C Air, Inc., Sunnyvale, CA (United States)
  2. World Health Organization, Geneva, (Switzerland)
  3. National Personal Protective Technology Lab., Washington, DC (United States)
  4. Stanford Univ. of Medicine, Stanford, CA (United States)
  5. Univ. of Colorado, Aurora, CO (United States)
  6. Stanford Univ., CA (United States)
  7. Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1646803
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 20; Journal Issue: 7; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhao, Mervin, Liao, Lei, Xiao, Wang, Yu, Xuanze, Wang, Haotian, Wang, Qiqi, Lin, Ying Ling, Kilinc-Balci, F. Selcen, Price, Amy, Chu, Larry, Chu, May C., Chu, Steven, and Cui, Yi. Household Materials Selection for Homemade Cloth Face Coverings and Their Filtration Efficiency Enhancement with Triboelectric Charging. United States: N. p., 2020. Web. doi:10.1021/acs.nanolett.0c02211.
Zhao, Mervin, Liao, Lei, Xiao, Wang, Yu, Xuanze, Wang, Haotian, Wang, Qiqi, Lin, Ying Ling, Kilinc-Balci, F. Selcen, Price, Amy, Chu, Larry, Chu, May C., Chu, Steven, & Cui, Yi. Household Materials Selection for Homemade Cloth Face Coverings and Their Filtration Efficiency Enhancement with Triboelectric Charging. United States. https://doi.org/10.1021/acs.nanolett.0c02211
Zhao, Mervin, Liao, Lei, Xiao, Wang, Yu, Xuanze, Wang, Haotian, Wang, Qiqi, Lin, Ying Ling, Kilinc-Balci, F. Selcen, Price, Amy, Chu, Larry, Chu, May C., Chu, Steven, and Cui, Yi. Tue . "Household Materials Selection for Homemade Cloth Face Coverings and Their Filtration Efficiency Enhancement with Triboelectric Charging". United States. https://doi.org/10.1021/acs.nanolett.0c02211. https://www.osti.gov/servlets/purl/1646803.
@article{osti_1646803,
title = {Household Materials Selection for Homemade Cloth Face Coverings and Their Filtration Efficiency Enhancement with Triboelectric Charging},
author = {Zhao, Mervin and Liao, Lei and Xiao, Wang and Yu, Xuanze and Wang, Haotian and Wang, Qiqi and Lin, Ying Ling and Kilinc-Balci, F. Selcen and Price, Amy and Chu, Larry and Chu, May C. and Chu, Steven and Cui, Yi},
abstractNote = {The COVID-19 pandemic is currently causing a severe disruption and shortage in the global supply chain of necessary personal protective equipment (e.g., N95 respirators). The U.S. CDC has recommended use of household cloth by the general public to make cloth face coverings as a method of source control. We evaluated the filtration properties of natural and synthetic materials using a modified procedure for N95 respirator approval. Common fabrics of cotton, polyester, nylon, and silk had filtration efficiency of 5–25%, polypropylene spunbond had filtration efficiency 6–10%, and paper-based products had filtration efficiency of 10–20%. An advantage of polypropylene spunbond is that it can be simply triboelectrically charged to enhance the filtration efficiency (from 6 to >10%) without any increase in pressure (stable overnight and in humid environments). Using the filtration quality factor, fabric microstructure, and charging ability, we are able to provide an assessment of suggested fabric materials for homemade facial coverings.},
doi = {10.1021/acs.nanolett.0c02211},
journal = {Nano Letters},
number = 7,
volume = 20,
place = {United States},
year = {2020},
month = {6}
}

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