Fig. 4.

Protections of POTS on multifunctional PPyn@POTS fabrics. a Water contact angle of PPyn@POTS fabrics. b Self-cleaning process of PPy6@POTS fabric. Dashed red cycles indicate the position of dust. c Water contact angle and d surface resistance of PPy6@POTS after immersion in DI water, NaCl, HCl (pH 1) and NaOH (pH 14) solutions for various times. The inset in c shows droplets of DI water, NaCl, HCl and NaOH on a PPy6@POTS fabric. An air cushion between the liquid and the fabric surface could be observed. e SE of PPy6@POTS and PPy6 fabrics after immersion in aqueous HCl (pH 1) and NaOH (pH 14)