Imagine you are standing on a slippery surface and the slightest imbalance makes you stumble. Researchers in the聽聽have developed such a surface, not for you, but for water droplets.
The super-slippery coating, called a superhydrophobic surface, makes water roll-off the surface even if it is tilted by just two degrees. Such surfaces can be used for self-cleaning windows, safer medical tools, waterproof clothing, protection of electronics and even to help ships and planes move faster.
Researchers took soot from a wax candle flame and transformed it into a durable coating that makes it practically impossible for water to stick to the surface. This invention doesn鈥檛 stop at water. It also repels sticky substances like honey and chocolate syrup and even cleans itself from dirt and dust.
Unlike other artificially developed water-repelling superhydrophobic coatings, which fail under heat and prolonged exposure to water, the design has proven astonishingly robust. It survived high-speed water jets, chemical baths, saltwater, scorching temperatures up to 650掳F and even a full month submerged underwater, emerging dry and intact.
鈥淭he magic comes from a clever combination of candle soot with oil-infused porous silica structure,鈥 says doctoral student Maheswar Chaudhary, who worked on the project alongside fellow doctoral student Ashok Thapa under the guidance of Mechanical and Aerospace Engineering Professor Shalabh C. Maroo. 鈥淭he porous structure holds the oil, which in-turn holds the soot particles making the surface superhydrophobic. We have shown this approach to work on both flat and curved surfaces, making it versatile for real-world applications. This isn鈥檛 just about repelling water, it鈥檚 about creating an easy-to-fabricate coating that truly survives real-world conditions.鈥
Maroo sees the discovery as a reminder that innovation doesn鈥檛 always start with exotic ingredients.
鈥淓ven something as ordinary as a wax candle can inspire groundbreaking ideas,鈥 he says. 鈥淲e鈥檝e turned candle soot into science, blending simple materials with simple nanoscale engineering to open up exciting possibilities for technology and sustainability.鈥
The research was recently published, with open access, in 鈥.鈥
