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3D Printing Liquid Metal on a Spider's Head at Room Temperature (VIDEO)


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".... a spider killed it beforehand" - Haha, too funny.... Seriously excellent tech, though. So when is Shapeways getting one? :-)
#1 Glenn Slingsby (Homepage) on 2013-07-09 17:56 (Reply)
Heh Sims building music
#2 Dan Lee on 2013-07-09 18:01 (Reply)
Pretty sure that's a moth by the way.
#3 Anonymous on 2013-07-09 18:01 (Reply)
its a Spider Moth
#4 Anonymous on 2013-07-09 18:03 (Reply)
Keep in mind that this alloy is and stays liquid at room temperature, save for
the thin oxide layer that (probably barely) keeps it from pooling on the floor.
(A nice science fair toy nonetheless, though the time-lapse video is probably
more impressive and easier to show around than the thing itself)
#5 mkroeker on 2013-07-09 18:08 (Reply)
If you want all the gory details
http://onlinelibrary.wiley.com/doi/10.1002/adma.201301400/pdf

"We focus on the binary eutectic alloy of gallium and indium (EGaIn, 75% Ga 25% In by weight), but any alloy of gallium will also work. EGaIn is liquid at room temperature (m.p. ?15.7 ° C) with metallic conductivity. [23] The liquid metal exhibits a negligible vapor pressure and low toxicity. Upon exposure to air, the metal forms a thin ( ? 1 nm) passivating“skin” composed of gallium oxide. [2] Passivation occurs nearly instantaneously under atmospheric oxygen levels and electrical resistance remains largely unaffected because the skin is thin. [24] In addition, the liquid metal adheres to most surfaces and alloys with many metals to form ohmic contacts."

There's still the matter of oxides present on the electrical leads of the (Radio Shack) components they are connecting together. Normally with solder you use flux to clean off the oxides and get good metal to metal connections. You may not have such great electrical connections using this technique but perhaps it would be better using gold plated metals on the component connections. This likely has applications in MEMS switches and re-configurable super high frequency antennas.
#6 MrNib on 2013-07-09 19:10 (Reply)
Write more, thats all I have to say. Literally, it seems as though you relied on the video to make your point.
You obviously know what youre talking about, why waste
your intelligence on just posting videos to your site when you could be giving us something informative to read?
#7 bee removal prairie hill (Homepage) on 2013-07-09 20:57 (Reply)
I can't believe I came here only to be lied to by Shapeways.

"on a Spider's Head" - boldfaced lies, I say - the technology isn't as advanced as i'd hoped. ;-)
#8 Bill Shirley (Homepage) on 2013-07-10 15:01 (Reply)
;-)
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