Climbing Robot Tank Can Corner Like a Gecko
This is not the first sticky-treaded robotank, but as far as I know, it's the first one that can manage to go around corners and make that tricky transition from horizontal to vertical. The somewhat unfortunately named "Tailless Timing Belt Climbing Platform" (or TBCP-11) comes from Simon Frasier University way up there in Canada. It weighs 240 grams, and has no problems climbing up whiteboards, glass, and other slick surfaces.
The sticking power of those treads comes from the same handy little Van der Waals forces that geckos use to effortlessly stick to, well, everything. Instead of tiny hairs, though, TBCP-11 uses tiny mushrooms, which provide a substantial amount of conformable surface area for the robot to use to adhere to walls.
Maximizing compliant surface area has been an issue for gecko-type (aka dry-adhesion) climbing robots for a long time; the material itself is spectacular, but the tough part is getting enough of the material to make contact with your climbing surface. For example, check out the picture of Stickybot III's toes in this article, and notice how little of the adhesive the robot is relying on to stick. This is one of the advantages of the TBCP-11: the continuous loops of adhesive material provide a lot of adhesion power.
While this robot does have some autonomous capability, it's still tethered for power, since batteries are heavy. It's going to take a little extra work to increase the strength of the adhesive so that the TBCP-11 can bring its power source onboard, and the SFU researchers are also trying to figure out how to get the thing to turn without the treads coming loose and causing the TBCP-11 to plummet to its doom.