1. XRD patterns of combustion synthesized powders before (a) and after (b) acid washing

2. Characterization of MgO-BN powders and BN powders

3. (a) Photo and (b) contact angle of water droplet on the surface of BN powders, photos of (c) BN powders floated on water without any submersion and (d) a large number of bubbles attached to the surface of BN powders adhering to the glass slide

4. (a) Relationship between water contact angle of BN/FSi coating surface and BN solid content, (b) SEM image of 30% BN/FSi resin coating surface (yellow arrows pointing the upright BN nanosheets), (c) sliding angle of 10 μL water droplet on 30% BN/FSi resin coating surface, and (d) self-cleaning effect of 30% BN/FSi coating