Table 1 The quantification of volume fraction and specific surface area extracted from the reusable, surgical and N95 face masks.

From: Microstructure analysis and image-based modelling of face masks for COVID-19 virus protection

Specimens

Phase volume fraction [%]

Surface area per volume [µm2 µm−3]

Fibre

Air

Particle

Fibre

Air

Particle

Reusable

18

82

-

0.27

0.08

-

Surgical Layer #1

26

74

-

0.17

0.09

-

Surgical Layer #2

31

69

-

0.40

0.18

-

Surgical Layer #3

12

88

-

0.21

0.07

-

N95 Layer #a

55

44

1

0.10

0.20

1.73

N95 Layer #b

14

86

-

0.64

0.14

-

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