[en] The aim of this research is to develop nanomaterials for coating applications. This research studied the effect of various TiO₂-SiO₂ composites in acrylic paint to enhance the hydrophobic properties of the substrate. Titanium dioxide containing silica in the range 20–35 mol% has been synthesized using sol–gel route. The XRD’s spectra show that increasing SiO₂ content in the composite, decreasing its crystalline properties but increasing the surface area. TiO₂-SiO₂ composite was dispersed in acrylic paint in 2% composition by weight. The largest contact angle was 70, which produced by the substrate coated with TS-35-modified acrylic paint. This study also investigated the enhanced photo-activity of TiO₂-SiO₂ modified with poly-aniline. The XRD spectra show that the treatment does not change the crystal structure of TiO₂. The photo-activity of the composite was evaluated by degradation of Rhodamine-B with visible light. The best performance of the degradation process was handled by the composite treated with 0.1mL anilines per gram of TiO₂-SiO₂ composite (TSP-A). On the other side, the contact angle 70 has not shown an excellent hydrophobic activity. However, the AFM spectra showed that nanoroughness has started to form on the surface of acrylic paint modified with TiO₂-SiO₂ than acrylic alone. (paper)