masks under the microscope — impressive images that show which ones work best

a group of researchers at NIST — USA’s national institute of standards and technology — puts masks under a microscope in order to understand how different materials work in order to slow the spread of COVID-19. the results indicate that cotton fabrics perform better than synthetic masks, with flannels being the most effective cotton overall. 

masks under the microscope — impressive images that show which ones work best
N95 mask
images by E.P. vicenzi/smithsonian’s museum conservation institute and NIST

 

 

edward vicenzi — who works at the smithsonian’s museum conservative institute studying the history and origin of the museum’s collection — used a scanning electron microscope to study the fabrics up close. the images give insights into how each material is able to filter particles depending on its properties. for example, N95 masks are made by melting and then air-blowing polypropylene plastic into a chaotic web. this results in small tangled fibers (shown above in purple) that trap minuscule particles.

masks under the microscope — impressive images that show which ones work best
cotton mask – cross section

 

 

the images taken by the researchers measure the width of the individual fibers present in fabrics as well as their thickness — an important variable that affects filtering. polyester flannel was compared to cotton flannel, and researchers found that in the cotton one, the weave is somehow chaotic, increasing the chance of an aerosol passing through the fabric to collide and stick to it.

masks under the microscope — impressive images that show which ones work best
cotton mask

 

 

as for cotton, once you see it up close, you can see fibers that kink and bend, increasing the amount of surface area that an aerosol can stick to. cotton is also hydrophilic, meaning that it likes water. it absorbs a persons breath and creates a moist environment which is absorbed by the fabric, making it grow larger and therefore creating more space for aerosols to get trapped.

masks under the microscope — impressive images that show which ones work best
top-down views of cotton flannel (left) and polyester flannel (right)

masks under the microscope — impressive images that show which ones work best
polyester mask – cross-sectional shapes of the individual fibers

masks under the microscope — impressive images that show which ones work best
polyester mask

masks under the microscope — impressive images that show which ones work best
rayon mask

 

 

project info:

 

name: masks under microscope

research: NIST

juliana neira I designboom

mar 22, 2021


designboom | architecture & design magazine

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