[DeTomaso] NPC: more on glues

Larry - Ohio Time Larry at ohiotimecorp.com
Tue Jan 12 11:46:24 EST 2016


 
 
Usually, if you want to join two metal objects together, you either weld or
solder them - depending on how big they are. Both processes involve the
application of heat, however. This can damage the items (in the case of
electronics), or even cause explosions (in the case of things like gas
pipes). That's why scientists at Boston's Northeastern University created
MesoGlue. It's a glue that bonds metal to metal - or to other materials -
and it sets at room temperature.
Designed by a team led by Prof. Hanchen Huang, MesoGlue is made up of
microscopic nanorods that have a metal core. Some of them are coated with
the ele-ment indium, and some with gallium.
The facing surfaces of the two objects-to-be-joined are first treated with
these rods. A layer of the indium-coated rods is applied to one surface,
while a layer of the gallium-coated rods goes on the other. In both cases
the rods stand up from the surface, sort of like the bristles of a
hairbrush. 
"When you mash the heads of the brushes together, all the little bristles
push past each other so the two brushes are basically stuck together," PhD
student/co-inventor Paul Elliott explains to us. "The interlacing process is
fairly similar in our glue. The bristles are spaced well enough so they can
slide or be pressed in between each other."
 <http://www.gizmag.com/mesoglue-metal-glue/41292/pictures#2> 
A diagram illustrating how the nanorods interlace and then create a liquid
which is subsequently solidified
When the indium and gallium on the rods come into contact, they form a
liquid. The metal cores of the rods then react with that liquid, causing it
to harden into a cohesive solid. This results in a bond that reportedly
matches the strength of a traditional weld or solder.
Additionally, unlike those formed by regular polymer-based glues, MesoGlue
bonds are thermally and electrically conductive, they aren't adversely
affected by heat, they're highly resistant to air/moisture leaks, and they
require little pressure when being formed. 
"The metallic glue has multiple appli-ca-tions, many of them in the
electronics industry," says Huang. "As a heat conductor, it may replace the
thermal grease currently being used, and as an electrical conductor, it may
replace today's solders. Par-tic-ular products include solar cells, pipe
fittings, and com-po-nents for computers and mobile devices."
MesoGlue is now being commercially developed by a spin-off company of the
same name. "We are working on turning this into a liquid form that will make
the process just like a glue or epoxy that you would use at home," Elliott
tells us.
A paper on the research was recently published in the journal Advanced
<http://mio.asminternational.org/amp/201601/#22>  Mate-rials & Processes,
plus there's more information in the video below.
Sources: Northeastern University
<http://www.northeastern.edu/news/2016/01/researchers-metallic-glue-may-stic
k-it-to-soldering-and-welding/> , MesoGlue <http://mesoglue.com/> 
 
 
Larry - Cleveland
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   Usually, if you want to join two metal objects together, you either
   weld or solder them - depending on how big they are. Both processes
   involve the application of heat, however. This can damage the items (in
   the case of electronics), or even cause explosions (in the case of
   things like gas pipes). That's why scientists at Boston's Northeastern
   University created MesoGlue. It's a glue that bonds metal to metal - or
   to other materials - and it sets at room temperature.

   Designed by a team led by Prof. Hanchen Huang, MesoGlue is made up of
   microscopic nanorods that have a metal core. Some of them are coated
   with the element indium, and some with gallium.

   The facing surfaces of the two objects-to-be-joined are first treated
   with these rods. A layer of the indium-coated rods is applied to one
   surface, while a layer of the gallium-coated rods goes on the other. In
   both cases the rods stand up from the surface, sort of like the
   bristles of a hairbrush.

   "When you mash the heads of the brushes together, all the little
   bristles push past each other so the two brushes are basically stuck
   together," PhD student/co-inventor Paul Elliott explains to us. "The
   interlacing process is fairly similar in our glue. The bristles are
   spaced well enough so they can slide or be pressed in between each
   other."

   [1][cid:image001.gif at 01D14D2E.DCD891B0]

   A diagram illustrating how the nanorods interlace and then create a
   liquid which is subsequently solidified

   When the indium and gallium on the rods come into contact, they form a
   liquid. The metal cores of the rods then react with that liquid,
   causing it to harden into a cohesive solid. This results in a bond that
   reportedly matches the strength of a traditional weld or solder.

   Additionally, unlike those formed by regular polymer-based glues,
   MesoGlue bonds are thermally and electrically conductive, they aren't
   adversely affected by heat, they're highly resistant to air/moisture
   leaks, and they require little pressure when being formed.

   "The metallic glue has multiple applications, many of them in the
   electronics industry," says Huang. "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."

   MesoGlue is now being commercially developed by a spin-off company of
   the same name. "We are working on turning this into a liquid form that
   will make the process just like a glue or epoxy that you would use at
   home," Elliott tells us.

   A paper on the research was recently published in the journal
   [2]Advanced Materials & Processes, plus there's more information in the
   video below.

   Sources: [3]Northeastern University, [4]MesoGlue



   Larry - Cleveland

References

   1. http://www.gizmag.com/mesoglue-metal-glue/41292/pictures#2
   2. http://mio.asminternational.org/amp/201601/#22
   3. http://www.northeastern.edu/news/2016/01/researchers-metallic-glue-may-stick-it-to-soldering-and-welding/
   4. http://mesoglue.com/
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