Hydration of Hydrophilic Cloth Facial Coverings Greatly Increases the Filtration Properties for Nanometer and Micrometer-sized Particles
Christopher D. Zangmeister, James Radney, Matthew E. Staymates, Edward P. Vicenzi, Jamie Weaver
Filtration efficiencies (FE) of natural, synthetic, and blended fabrics were measured as a function of relative humidity (RH) for particles with mobility diameters between 50 nm and 825 nm. Fabrics were equilibrated at 99 % RH, mimicking conditions experienced when worn as a cloth facial covering. The FE increased after equilibration at 99 % RH by a relative percentage increase of 33 % ± 12 % for fabrics comprised of two layers of 100 % cotton when tested by 300 nm diameter NaCl aerosol. The FE for samples of synthetics and polyester/cotton blends were unchanged upon equilibration at 99 % RH. Increases in FE for 100 % cotton fabrics were a function of particle size and increased by a relative percentage increase of 61 % at the largest measured particle size (825 nm). Flow visualization data for 100 % cotton and polyester also showed that equilibration at 99 % RH increased capture of particles > 1 µm. The experimental results are consistent with increased particle capture due to H2O adsorption on the fiber surface.
, Radney, J.
, Staymates, M.
, Vicenzi, E.
and Weaver, J.
Hydration of Hydrophilic Cloth Facial Coverings Greatly Increases the Filtration Properties for Nanometer and Micrometer-sized Particles, ACS Applied Nano Materials
(Accessed September 24, 2023)