Hydrophobic blue ceramic nano pigments based on heulandite-Na zeolite and coating on the ceramic tile surface

Inorganic nanopigments have been used in various research and industrial fields due to their special properties and applications such as in digital printing, paint, cool coating, and hydrophobic and resistance surface coating. In this perspective, we have synthesized the blue color ceramic nanopigments from the host heulandite-Na zeolite with the guests of zinc oxide and cobalt chloride. The advantage of using zeolite and zinc oxide is the plentiful and cheap materials, which help to reduce less amount of cobalt to achieve intense blue color. The method was mixing the amount of the precursors in water with stirring for ۶ hrs at ۸۵℃. The method was ion-exchange and heat-induced collapse of the zeolite structure at ۱۰۰۰℃. Co-willemite and Co-gahnite are two phases that responsible for the blue color in the sample as characterized by X-ray diffraction (XRD) analysis. From the UV-vis spectroscopy, the absorption band showed that the three peaks from ۵۰۰ nm to ۶۵۰ nm were related to the cobalt transition in the sample. Besides, the colorimetric result indicated that the pigment color in the region of blue color as represented by L*=۴۹.۲, b*=-۲۲, and a*=-۱۱. Then we modified the surface of the achieved pigments with the use of sodium dodecyl sulfate as a surfactant with water. The latter were mixing for ۱ hour and thermal treatment at ۲۰۰℃ for ۱hr. Then it coated on the surface of ceramic tile. We achieved the hydrophobic surface with the contact angle CA=۱۳۵˚, this can be used as a self-cleaning ceramic surface.

کلیدواژه ها:

Blue color ، Crystal structure ، Clinoptilolite zeolite ، Hydrophobicity ، Coating ، Ceramic surface