A surface can be super-repellent to completely wetting liquids through a specific doubly re-entrant structure that minimizes liquid-solid contact. Researchers at UCLA, Tingyi "Leo" Liu and Chang-Jin "CJ" Kim, demonstrated that a silica surface, when structured with micro/nano-features, can repel all liquids, including fluorinated solvents like perfluorohexane, which have extremely low surface energy. This surface, made without any hydrophobic coating, withstands high temperatures and resists biofouling. The key is the surface roughness, which allows the liquid to be suspended and repelled by minimizing contact. The study shows that the intrinsic wettability of the material is irrelevant, and the structure's geometry is the main factor. The surface's ability to repel liquids is due to a low liquid-solid contact fraction, enabling a high apparent contact angle and low roll-off angle. The research also confirms that similar superomniphobic properties are achievable with other materials like metals and polymers. The findings have implications for various applications, including cooling systems and anti-biofouling surfaces. The study highlights the importance of surface structure in achieving extreme liquid repellency, even for highly wetting liquids.A surface can be super-repellent to completely wetting liquids through a specific doubly re-entrant structure that minimizes liquid-solid contact. Researchers at UCLA, Tingyi "Leo" Liu and Chang-Jin "CJ" Kim, demonstrated that a silica surface, when structured with micro/nano-features, can repel all liquids, including fluorinated solvents like perfluorohexane, which have extremely low surface energy. This surface, made without any hydrophobic coating, withstands high temperatures and resists biofouling. The key is the surface roughness, which allows the liquid to be suspended and repelled by minimizing contact. The study shows that the intrinsic wettability of the material is irrelevant, and the structure's geometry is the main factor. The surface's ability to repel liquids is due to a low liquid-solid contact fraction, enabling a high apparent contact angle and low roll-off angle. The research also confirms that similar superomniphobic properties are achievable with other materials like metals and polymers. The findings have implications for various applications, including cooling systems and anti-biofouling surfaces. The study highlights the importance of surface structure in achieving extreme liquid repellency, even for highly wetting liquids.