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Heat Reactive Fluid? Answered

I've seen metal once that was reactive to heat, it changed color when heat was applied and changed back afterwards (funny note it was used in a urinal) I'm wondering if a liquid form of this exists ? 

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orksecurity

Best Answer 7 years ago

May just have been a liquid-crystal finish on the urinal's surface.

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frollardorksecurity

Answer 7 years ago

+1
like the stick-on thermometers on aquariums

The author's product in question is a psychological trick to convince drunk people to actually urinate IN the urinal by making a game of it.

Same with any time you've seen an image of a fly printed on the porcelain. Give a wandering mind a target, and they're less likely to piss on the floor XD


As for a liquid form - I know you can get Thermochromic powder which can be added to paint to make a white/black change, but the rainbow colour change is really down to liquid crystal as you say.

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Douglerfulfrollard

Answer 7 years ago

hmmm, what i was planning to do was use in a liquid cooling rig on a computer, would be really interesting to literally see the "heat" move in the system. Is there any way this could be mimed? Perhaps a powder in the water?

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Jack A LopezJack A Lopez

Answer 7 years ago

You might have noticed the SolarColorDust pages have a lot of "Ooh-Ahh! Look at the pretty colors!", but are very much lacking in technical data. 

Regarding questions about what that powder actually is, and what its weaknesses are, I found this:
http://www.qcrsolutions.com/Site/Thermochromic_Pigments,_Inks,_and_Plastics_|_QCR_Solutions_Corp.html
and this pdf:
http://www.qcrsolutions.com/Site/Thermochromic_Pigments,_Inks,_and_Plastics_|_QCR_Solutions_Corp_files/Thermochromic%20Pigments%20%7C%20Technical%20Datasheet%20%7C%20QCR%20Solutions%20Corp.pdf

Anyway, to me it looks like this stuff might work for your PC cooling toy, for some amount of time.  They quote a "shelf life" of 12 months. In addition to this, the pdf tells you other conditions to avoid: UV light, prolonged exposure to temperatures greater than 50C, polar solvents... shear from milling will break the microcapsules, and um... don't feed 'em after midnight.  You'll be sorry if you do. ;-)

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frollardDouglerful

Answer 7 years ago

The powder exists - search for thermochromic pigment. you MIGHT be able to safely add it to your coolant.

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icengfrollard

Answer 7 years ago

Amazing what you pick up as a 911 type :-)

A

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frollardiceng

Answer 7 years ago

I'm an inquisitive type who happens to have a career 911ing :) I blame google, wikipedia, instructables, and stumbleupon for a majority of my knowledge.

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icengfrollard

Answer 7 years ago

I rather look at your life with envy of your wondrous future coming to you.
As doctor Zarkov in Flash Gordon you populate, distill and organize knowledge's
odd bits with compassion, how wonderful to fill a brain this way.
Best Regards,

Alex...

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frollardiceng

Answer 7 years ago

I am genuinely flattered. Thank you very much for the kind words.

-Jamie

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josh.soanes.1

3 years ago

there is. its called LCD it stands for Liquid Crystal Display its inside of screens of older phones the screen contains a really thin sheet of liquid crystal and is electrically separated by a grid of insulating material that separates the sheet into millions of pixels that are connected to two sets of wire arrangements that trigger each pixel similar to a times table chart were the two numbers make up the answer(the two numbers are the wires and the answer is the pixel) but its probably not enough to collect for your use. there is some inks that have this effect when you add heat you can also make a ferro fluid. the gas helium also contains these properties but requires additional technology to use it in the light spectrum and is used in thermal vision equipment

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iceng

7 years ago

Yea...... That is weird,
I once had this spoon that puddled in a hot tea.
Someone told me it was woody metal.
Nut sure though :-þ
Have a good one.

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kelseymhiceng

Answer 7 years ago

Ah, yes. Gallium. Back in the days before toxicity was something people paid attention to :-)

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kelseymhJack A Lopez

Answer 7 years ago

Indeed! Iceng PM'ed me about it, and I found that article to be quite interesting. Not being a metallurgist, I had never encountered the term "eutectic" before. It's always great to learn something new!