Epidemics of viral diseases are the most preva‎lent in the world. Viruses are spread when an infected person coughs, sneezes, or exhales. In some cases, these droplets are too heavy to float in the air, quickly settle on surfaces and can remain on surfaces for a long time. To minimize the risk of infection, the entire surrounding environment should be regularly disinfected. Developing anti-viral coating for surfaces frequently used by the public can be a practical route to prevent the spread of viral particles and disable the transmission of viruses. One of the types of these coatings is nano photocatalysts. On the surface of the photocatalysts, OH, O2- radicals and other active oxygen metabolites are produced, which oxidize the absorbed viruses and cause damage to the protective protein membrane, followed by the inactivation and destruction of the viruses. Bacteriophage is one of the most resistant types of viruses, and if it is deactivated by a nano photocatalyst, it can be expected that the studied nano photocatalyst will also affect animal and human viruses and deactivate them as well. In this research, the substrate made of 316L stainless steel, which is widely used in medical and general equipment, was coated by TiO2 by two coating methods, vapor phase and sol-gel. Adding 2wt% of copper nanoparticles to TiO2 in sol-gel coating improved the photocatalytic activity and increased the degradation percentage of Methylene blue from 35% to 79% compared to the sol-gel coating without copper addition. To characterize the coating, Field emission scanning electron microscope (FESEM) images, X-Ray diffraction analysis (XRD) and elemental mapping were used. By examining the surface roughness and also measuring the contact angle of the water drop with the coating surface, it was determined that the surface of the coating is super hydrophilic and the contact angle of the water drop with the surface was measured to be less than 10 degrees. This was while the contact angle of the water drop with the surface, before coating, was about 117 degrees. Also, the average surface roughness for optimal coverage was measured at about 5.9 micrometers. The potentiodynamic polarization test and electrochemical impedance spectroscopy were conducted to compare the corrosion resistance of the surface before and after coating, which indicated a drop in corrosion resistance after coating due to the creation of porosity on the surface so that the corrosion current after coating increased by 1.6×10-7 (A/ Cm2). Finally, the antiviral performance of the coating was eva‎luated with the Agar Overlay method. The decrease in the titer or the number of bacteriophage λ showed the optimal antiviral performance of the coating so that after 1 hour of placing the solution containing bacteriophage on the surface of the photocatalyst under UV light, 99% reduction in Bacteriophage titer was observed.

عبدالمجيد اسلامي , شيدا لباف

مهدي رنجبر , مهدي قاسمي

مريم كرباسي , مهشيد خرازيهاي اصفهاني