Figure 4. self-cleaning ability of the (silicate/TiO₂)*20 coated stainless steel mesh.

(a) Change of water contact angle of the oleic-acid-contaminated meshes as a function of UV illumination time. () (silicate/TiO₂)*20 coated mesh; () PDDA/silicate coated mesh; () original mesh. () original mesh without oleic acid contamination. (b) Water contact angle changes on the (silicate/TiO₂)*20 coated mesh in the five cycles of the oleic acid contamination and UV illumination based recovery. () (silicate/TiO₂)*20 coated mesh; () after oleic acid contamination; () after UV illumination recovery.