Figure 4  Wettability and chemistry of webs with different treatments. (A) Contact angle of various liquids on the coverweb and filter web, (B) water contact angle, and (C) FTIR-ATR transmittance of the differently-treated media. Contact angles were measured in 60 s upon placing the liquid drop. For EtOH, IPA, and detergent solution, the contact angles were 0°.