Original news release was issued by Nanyang Technological University at ResearchSea.
Glue with completely adjustable strength and viscosity? Immensely more useful than you might imagine. This novel adhesive pretty much erases the various issues that come up in manufacturing and repair: damp environments, vibrating surfaces, and materials with properties anywhere between gel-like and completely solid. It really only needs a tiny jolt of electricity.
It was developed by Dr. Terry Steele and his student Gao Feng from the Nanyang Technological University in Singapore, and it has the potential of completely changing the way manufacturing industry operates. But it goes beyond that, as it could prove to be a suitable replacement for surgical stitching, and is even capable of underwater pipe repairs.
The bonding agent is a light, low-viscosity flowing liquid that allows users to coat and exactly position the materials to be joined. Applying voltage to the gel then rapidly cures it to a strong bond with high elasticity and high sheer strength. The liquid gel “cures” to form a polymer bond when a voltage of less than two volts is passed through it. Curing is the amount of time it takes for a glue to reach full strength after it dries. The glue stops curing as soon as the current is turned off. Users can fine-tune the bond’s strength and flexibility by varying the current’s voltage and duration.
Currently available quick-curing adhesives used in industry are activated by light, heat or chemical catalysts, each of which limits uses to particular materials and appropriate environments. Light-activated adhesives, for example, are only suited to materials that are somewhat transparent, while thermosetting can only be used with components that can tolerate heat.
Such quick-curing adhesives are used widely in the manufacture of medical devices, automobiles and other consumer goods, where they are favoured over more labour-intensive, heavier mechanical fasteners such as rivets, screws or bolts, which weaken the materials to be fixed. However, there has been little innovation in the field for decades.
Potential uses for electro-cured adhesives include biological devices for which photo- or thermo-setting glues are problematic, such as bioelectronics or polymer electronics designed for attachment to living tissue. The adhesive can be tuned to handle certain vibration frequencies or to match the firmness and flexibility of the soft tissue to which it will be attached.
The researchers have worked on the electric glue for a while, and claim that it should be possible to reverse the “curing” process, opening doors to wide reusability, great savings and a more sustainable manufacturing industry.