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Cytotoxicity and filtration properties of the BCNWs. a) The NIH3T3 cell viabilities after 24 h of contacting with different BCNWs. b-d) Live/dead images of control, TOCNWs-PHG, and TOCNWs-NEO. e) Filtration efficiency and pressure drop of BCNWs combined with PP MBNWs. f) Demonstration of good air permeability of BCNWs compared with PP MBNWs. g-i) SEM images of sodium chloride particles capture of PP MBNWs and BCNWs after the loading filtration test.
