https://en.wikipedia.org/wiki/Synthetic ... ko_Tape.22"Gecko Tape"[edit]
This example is one of the first developments of synthetic setae, which arose from a collaboration between the Manchester Centre for Mesoscience and Nanotechnology, and the Institute for Microelectronics Technology in Russia. Work started in 2001 and 2 years later results were published in Nature Materials.[12]
The group prepared flexible fibres of polyimide as the synthetic setae structures on the surface of a 5\mum thick film of the same material using electron beam lithography and dry etching in an oxygen plasma. The fibres were 2\mum long, with a diameter of around 500 nm and a periodicity of 1.6\mum, and covered an area of roughly 1 cm2 (see figure on the left). Initially, the team used a silicon wafer as a substrate but found that the tape’s adhesive power increased by almost 1,000 times if they used a soft bonding substrate such as Scotch tape – This is because the flexible substrate yields a much higher ratio of the number of setae in contact with the surface over the total number of setae.
The result of this "gecko tape" was tested by attaching a sample to the hand of a 15 cm high plastic Spider-Man figure weighing 40g, which enabled it to stick to a glass ceiling, as is shown in the figure. The tape, which had a contact area of around 0.5 cm2 with the glass, was able to carry a load of more than 100g. However, the adhesion coefficient is only 0.06, which is low compared with real gecko(8~16).