Nanotechnology scientists have developed a metallic glue that can bind metals together at room temperature.
MesoGlue can bind metals to other surfaces without soldering or pressure. It could potentially change the landscape of electronics.
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“MesoGlue was founded by Huang and two of his PhD students: They had a dream of a better way of sticking things together.”
Those “things” are everything from a computer’s central processing unit and a printed circuit board to the glass and metal filament in a light bulb. The “way” of attaching them is, astonishingly, a glue made out of metal that sets at room temperature and requires very little pressure to seal. “It’s like welding or soldering but without the heat,” says Huang, who is professor and chair in the Department of Mechanical and Industrial Engineering.
In a new paper, published in the January issue of Advanced Materials & Processes, Huang and colleagues, including Northeastern doctoral student Paul Elliott, describe their latest advances in the glue’s development. Our curiosity was piqued: Soldering with no heat? We asked Huang to elaborate.
On new developments in the composition of the metallic glue:
“Both ‘metal’ and ‘glue’ are familiar terms to most people, but their combination is new and made possible by unique properties of metallic nanorods–infinitesimally small rods with metal cores that we have coated with the element indium on one side and galium on the other. These coated rods are arranged along a substrate like angled teeth on a comb: There is a bottom ‘comb’ and a top ‘comb.’ We then interlace the ‘teeth.’ When indium and galium touch each other, they form a liquid. The metal core of the rods acts to turn that liquid into a solid. The resulting glue provides the strength and thermal/?electrical conductance of a metal bond. We recently received a new provisional patent for this development through Northeastern University.”
On the special properties of the metallic glue:
“The standard polymer glue does not function at high temperatures or high pressures, but the metallic glue does. The standard glue is not a great conductor of heat and/?or electricity, but the metallic glue is. Furthermore, the standard glue is not very resistant to air or gas leaks, but the metallic glue is.
“‘Hot’ processes like soldering and welding can result in metallic connections that are similar to those produced with the metallic glue, but they cost much more. In addition, the high temperature necessary for these processes has deleterious effects on neighboring components, such as junctions in semiconductor devices. Such effects can speed up failure and not only increase cost but also prove dangerous to users.”
What are some applications of the technology?
“The metallic glue has multiple applications, many of them in the electronics industry. As a heat conductor, it may replace the thermal grease currently being used, and as an electrical conductor, it may replace today’s solders. Particular products include solar cells, pipe fittings, and components for computers and mobile devices.”
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