Water-based preparation of highly oleophobic thin films through aggregation of nanoparticles using layer-by-layer treatment

► The layer-by-layer process was applied to the surface of TiO2 nano particles. ► This method can control the particle's aggregation and can generate micro-scale rough structure. ► Micro-nano scale rough structure using LBL process shows the high oleophobicity. ► This method may have industrial advantages because it is aqueous based.