[en] In this present study we developed anti-scratch and anti-algal coating formulation with silica, titania and silicatitania core-shell nanoparticles individually. This core-shell nanoparticle was synthesized because of silica is a hard material that improves the mechanical strength and shell TiO₂ on core silica can impart the antimicrobial property of the material. These nanoparticles were prepared through sol-gel process and peptization process. These nanoparticles were characterized by Dynamic light scattering, UV-visible spectrophotometer, scanning electron microscopy and X-Ray Diffraction. Particle size was measured 90 nm for silica nanoparticle prepared through sol gel process. TiO₂ nanoparticle size was measured 107 nm prepared through sol-gel synthesis and 77 nm prepared through peptization process. Particle size of core-shell nanoparticle was measured 240 nm prepared through sol gel process and 144 nm from peptization process. Coating formulation was developed with polyurethane binder. Scratch testing was carried out for these coating formulations on glass substrate applying different load from 3N to 9N with coating thickness of around 100 μm. These same coating formulation were applied on bricks for anti-algal testing against green algae and mix green algae with 4wt % material concentration. (author)