There was a time when if you wanted to scale a wall you had to turn a camera on its side and call [Adam West] or [Lionel Ritchie]. Unless you were a gecko, that is. Their host of tiny bristles and intramolecular forces allow them to run up walls and across the ceiling with ease.
You may have seen synthetic gecko-like adhesive surfaces using the same effect. Some impressive wall-climbing robots have used these materials, though they’ve all shared the same problem. Gecko adhesion can’t be turned off. Happily, for the robot wall climber unwilling to expend the extra force to detach a foot there is an alternative approach. Electroadhesives use electrostatic force to attach a plate held at a high potential to a surface, and today’s featured video is [Carter Hurd]’s home-made electroadhesive panel (YouTube).
He cites this paper and this description of the technology as the influences on his design, two aluminium foil electrodes sandwiched between plastic sheet and sticky tape. He applies 6kV from an Emco DC to DC converter to his plates, and as if by magic it sticks to his drywall. Of course, it’s not quite as simple as that, he tried several surfaces before finding the one it stuck to. Adhesion is fully under control, and such a simple device performs surprisingly well. The Emco converters are sadly not cheap, but they are an extremely efficient product for which he only needs a few AA cells on the low voltage side.
His full description is in the video below the break.