Article on a modified surgical mask to make it 100% effective for viruses:
https://www.nature.com/articles/srep39956
Free and down-loadable.
"Universal and reusable virus deactivation system for respiratory protection"
Adds a plain salt coating(!) to the inner layer of a three-layer mask.
I just skimmed it, seems a little light on details on how to prepare the mask.
There are expert experimentalists on this site; any tips on how to do what they did?
ETA:
Ah, should have read more. Procedure under "Methods".
And from the Abstract:
"When tested with tightly sealed sides, salt-coated filters showed remarkably higher filtration efficiency than conventional mask filtration layer, and 100% survival rate was observed in mice infected with virus penetrated through salt-coated filters."
