Geckos are amazing creatures, with the ability to walk on and stick to all manner of surfaces. If you’ve ever woken up to see lizards on your ceiling, you’re already familiar with their capabilities. The mechanisms behind this have been an area of much research in recent times, and [The Thought Emporium] decided to try and recreate the effect himself (Youtube video, embedded below).
The way geckos stick to surfaces is through the use of nano-scale hairs on their feet. These hairs dramatically increase the surface area of contact between the gecko and the surface in question. This allows the usually-small intermolecular forces to stack up and keep the gecko adhered.
Several teams have managed to create synthetic substances that recreate this ability; indeed we’ve featured some here before. In this case, experimentation started with an attempt to generate the requisite nanostructures by casting RTV silicone on a microporous filter. This was unsuccessful, with the hairs on the surface of the material created being too sparse and at random angles. The next stage involved attempting to use a tattoo gun, needles, and finally sharpened tungsten wires to pattern wax, which could then have silicone cast onto it to pick up the geometry. This too was unsuccessful, as it wasn’t possible to generate tiny enough features to generate the effect.
The final experiment involved casting silicone upon a 1000 line per millimeter diffraction grating. This generated tiny ridges on the surface of the silicone, and greatly improved its sticking ability. While the ridges generated aren’t as capable as gecko feet or professionally-produced films, they do have an impressive weight holding ability. A small section of the silicone was able to hold over 20 pounds for an extended period in testing.
It’s a great example of how to do seemingly complicated science with materials that can be easily acquired for the home workshop. We’d love to see just how strong a gecko tape could be produced with more work done on this method. Video after the break.
Continue reading “Easy DIY Gecko Tape”
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.
Continue reading “An Easy Home Made Electroadhesive”
If you need to build a robot to carry something, you need a bit motor, right? Not so with these tiny robots out of Stanford’s Biomimetic Dexterous Manipulation Laboratory. One of these 12g MicroTugs can drag a 600g mug of coffee across a table, or even a 12kg weight. According to the authors, it’s a, ‘capability … comparable to a human dragging a blue whale.’ Square-cube law notwithstanding, of course.
What makes these little robots so strong? It’s not the actuators; it’s their feet. On the bottom of this robot is a material that uses mechanical anisotropic adhesion, a fancy material that only sticks to flat surfaces when it’s being pulled in a specific direction.
The best description of this material inspired by gecko feet would be this video, also from the Stanford BDML lab. It’s a neat material that we’ll probably find in Post-It notes in a decade, and with a single motor, a tiny robot can lift thousands of times its own body weight.
Videos below. Thanks [Adrian] for the tip.
Continue reading “Strong Little Robots With Gecko Technology”
Stickybot has gone through a pretty radical upgrade. You may recall the gecko looking glass walking bot from all over the net. While it was pretty cool, the technology has gone much further. Not only is it designed to look like a gecko, the feet are actually made to adhere to surfaces in the same manner. They are using an adhesive system based off Van Der Waals forces. Though the stickybot 3 doesn’t walk yet, the feet are already impressive. Look how little of the foot is actually making contact with the glass. See how easily he can remove and re-adhere it? Simply amazing.