The Max Planck Institute (Germany) has developed a gallium-based reversible glue, in which, if necessary, you can “turn on” and “turn off” the gluing functions.
A few words about gallium. It is a soft, silvery metal that melts as early as 30 ° C, which is slightly above room temperature. Scientists at the Planck Institute decided to take advantage of the unique fusibility of gallium to create a reversible adhesive.
To glue two objects together, a drop of liquid glue is introduced between them and then cooled to a temperature below 30 degrees, at which gallium solidifies, fixing the gluing. To separate these objects again, the glue is heated again to 30 degrees.
Unlike conventional adhesives, the gallium formulation leaves no residue. Other advantages of the glue are reusability without loss of quality and electrical conductivity, which will allow it to be used in electrical circuits as a temporary connection.
The reversible adhesive is especially effective when bonding fragile materials. It perfectly "copes" with glass, plastic, gold and does not lose its properties even on wet surfaces. Its creators are convinced that the material has a bright future.