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Next-gen adhesive based on octopus suckers
Now, Korean scientists have developed a material that mimics the sucker discs on those tentacles. It could be used for adhesive pads that are reversible, reusable, fast-acting, and effective even in wet conditions.
A real octopus sucker disc has a hollow cavity in the middle, surrounded by a ring of muscle tissue. The size of the cavity is controlled by the octopus making that tissue thicker or thinner – the thinner the muscle tissue, the larger the cavity, and the lower the air pressure within it. A larger cavity creates more suction, while a smaller one causes the disc to release.
The scientists, from the Korea Institute of Science and Technology (KIST) and Ulsan National Institute of Science and Technology (UNIST), made their pad using rubbery polydimethylsiloxane (PDMS) studded with an array of tiny pores. Each of those pores is lined with a thermally-responsive polymer.