Binder materials for modification of functional nanoparticle coating
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There are lots of changes happening in the field of surface modification. The purposes of this thesis is to present a surface modification procedure that could be useful in producing durable coatings from nanoparticles. Generally, there are three ways to modify a surface: change the structure of the material, remove material or add material. Liquid Flam Spray and spin coating processes for adding material to the surface were explained in this research. Since the mid-twentieth century, the interest for usage of natural materials has declined. We want to change this trend and from four binders that were used in this thesis, three of them are natural (pine tar, Zein and gum arabic) and just one of them is a polymer (PMMA). Three different coatings were made from all of the materials in different concentrations (0.2, 1 and 5%). Pine tar and PMMA were dissolved in acetone, gum arabic in water and Zein in ethanol 70%. The prepared solutions were spin coated on top of the clean glass substrate for producing thin film from each concentration. All samples were heat-treated in an oven in order to solidify the thin layer of film on the substrate. Titanium dioxide nanoparticles were deposited on top of the binders by Liquid Flame Spray (LFS) technique. Photocatalytic activity of the samples after scrubbing and ultrasonic bath were tested in order to understand which binder performs best in fixing the nanoparticles on top of the substrate. The results were shown in the graphs, where the concentration of methylene blue changes as function of UV exposure and activity of TiO2. SEM images of the binder coatings were prepared to see the surface structure before and after the nanoparticle deposition. Result evaluation revealed that the pine tar with 1% concentration is better than the other binders in any concentrations tested and, also, Zein was shown to have acceptable results compared to gum arabic and polymethyl methacrylate (PMMA).