Development of Multifunctional Ceramic Coatings with Superhydrophobic and Cool Surface Properties Using Blue Nanopigments Based on Heulandite Zeolite

The heulandite zeolite was successfully used as the host structure for a new Co-based blue colorant ceramic pigment. The method was the ion exchange of Co and Zn cations with the host structure, which induced a heat-collapsed structure followed by a recrystallization process at ۱۲۰۰ °C/h. The synthesized blue pigment was coated by spraying on the surface of pre-sintered ceramic tile followed by firing at ۹۸۰ °C/۱۰min. For modification of its surface, ZnO nanoparticles (NPs) and commercial antifouling were used. The blue powder pigment and ceramic coated surface were characterized with XRD, Rietveld refinement, TGA-DTA, FE-SEM-EDS, BET-BJH, UV-VIS-NIR spectroscopy, CIEL*a*b* color measurement, water contact angle (WCA), and roughness analysis. The single-crystal Co-willemite has been achieved (b* = ۴۵ and a* = ۰.۵). The blue pigment coated on the surface after being modified with ZnO NPs and antifouling revealed a superhydrophobic surface with WCA = ۱۵۳.۷°. Due to this, a low water sliding angle of less than ۵° have achieved. The surface showed high thermal stability and adherence. The superhydrophobicity was mainly due to the micro-nanopatterned lotus leaf-like crystal structure and roughness of ۳.۱۵ μm on the surface. The surface showed ۶۴% total reflectance from ۷۰۰ to ۲۵۰۰ nm (UV and NIR), which resulted in a perfect candidate for a cool coating.

کلیدواژه ها:

Blue nanopigment ، Heulandite zeolite ، Superhydrophobic ، Cool coating ، Ceramic tile