Inspired by Spiders and Ants, Researchers Create Unsinkable Metal

The team used femtosecond bursts of laser to create the surface of the metal with specific patterns that trap air, which makes them water repellent. However, this method worked only for a while, as after being submerged in water, the structures would lose their floating powers.

This is where the ants and the spiders come into the equation. 

Both insects have the power to stay afloat for long periods of time. So the researchers set off on their quest to find ways to trap air in an enclosed area, much like diving bell spiders and fire ants. 

"That was a very interesting inspiration," said Guo. As the researchers noted in their paper: "The key insight is that multifaceted superhydrophobic (SH) surfaces can trap a large air volume, which points towards the possibility of using SH surfaces to create buoyant devices."

The team built a structure that uses two parallel aluminum plates that face inward. This way, the plates are enclosed and don't wear and tear from external factors. These plates are also distanced just the right amount to trap enough air between them to keep them afloat. 

Impressively, even after being entirely submerged and held down for two months, when freed, the structures bobbed right back up to the surface of the water. 

Guo said that the "etching process could be used for literally any metals, or other materials," and not only aluminum. 

This creation could light the way for future water-based projects.