The innovative use of suction cups inspired by the highly adaptive suckers of octopuses is not a new concept. Various models have drawn from their unique capabilities, utilizing pressurized chambers to achieve a strong adherence to surfaces. Others have aimed to replicate the biological structure of these suckers by incorporating features such as microdenticles, tiny projections found on octopus suckers that enhance their grip strength.
While previous designs have demonstrated some effectiveness, they often suffered from leakage due to insufficient contact between the sucker and the surface. Additionally, many of these models required vacuum pumps for functionality. In an effort to overcome these challenges, Yue and his research team have developed a new type of sucker that mimics the morphology and mechanics of an octopus’s natural abilities.
These suckers are crafted to be muscular and highly flexible, allowing them to adapt to various surface contours without any leakage. They not only grip securely but can also release their hold with ease. The researchers utilized silicone sponge material for the core and a soft silicone pad for the exterior to achieve these properties.
To further enhance the biomimicry aspect of their design, Yue tackled one significant issue in earlier models: the absence of mucus secretion, which plays a crucial role in the adherence of octopus suckers.
This really sucks
Traditionally, it was believed that the suction capabilities of cephalopods arose solely from their soft and flexible bodies, which could easily shape themselves to adhere to surfaces. However, the role of mucus secretion had often been overlooked—until Yue introduced it into his robotic suckers.
Known for being five times thicker than water, mollusk mucus significantly enhances grip. In Yue’s new suckers, an advanced fluidic system simulates the adhesive secretions produced by biological suckers, ensuring a liquid seal that nearly eliminates the possibility of gaps. While this artificial fluid may not match the strength of octopus slime, water serves as a pragmatic alternative for underwater exploration, whether in caves or on the ocean floor.
