Some adhesives may soon occupy a metallic sheen and be particularly easy to unstick. Researchers at the Max Planck Institute for clever Systems in Stuttgart are suggesting gallium as just such a reversible adhesive. By inducing slight changes in temperature,they can control whether a layer of gallium sticks or not. This is based on the fact that gallium transitions from a solid state to a liquid state at around 30 degrees Celsius. A reversible adhesive of this kind could occupy applications everywhere that temporary adhesion is required, such as industrial pick-and-place processes, and transfer printing,temporary wafer bonding, or for moving sensitive biological samples such as tissues and organs. Switchable adhesion could also be suitable for use on the feet of climbing robots.
Source: phys.org