Single‐Step Wet‐Process Formation of Dual‐Layer Superslippery Coating with Transparency and Robust Omniphobicity

Abstract Robust coatings that fully repel liquids have a broad range of applications. However, it remains challenging to have an easy, scalable, and substrate‐independent preparation method for these coatings. Here, a coating solution that forms stable lubricant surface‐to‐solid substrates simply by casting, dipping, or spraying without specific limitation in the substrate, is synthesized. Moreover, the coating is formed inside the long narrow tube by flowing the solution. The solution constitutes nanoparticles, a silicone binder, and a binary mixture of a lubricant and a suitable solvent. The coating is transparent (>90%), self‐healable, mechanically robust, and repels immiscible liquid droplets, including water, oil, solvent, and fluorinated polymers, with negligible sliding angle. The coating comprises two layers: a lubricant stabilizing base layer and a top lubricant layer. Generally, two‐step coating processes require two layers; however, the coating solution solely forms the two layers by the interplay between a solvent evaporation triggered surface lubrication and the interfacial clogging of nanoparticles. This straightforward and universal coating approach for robust omniphobic surface preparation is widely applicable for applications.