Superconductivity Theory
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Superconductivity Theory
Once again I'll leave it to the well educated on the subject to say if this has any importance:
http://www.sciencedaily.com/releases/20 ... 132930.htm
The story sure sounds interesting...
Mike
http://www.sciencedaily.com/releases/20 ... 132930.htm
The story sure sounds interesting...
Mike
Basically, they tried to break a superconductor in a known way, and it didn't break. So they came up with a model that explains this. A more fundamental question will be is their model correct, or is there some other way to explain the behavior.
In any case, it is a really nice discovery. Proves there is a hell of a lot we still don't know about how things work!
In any case, it is a really nice discovery. Proves there is a hell of a lot we still don't know about how things work!
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Yeah, that's mentioned in the Wikipedia article here: http://en.wikipedia.org/wiki/High-tempe ... rconductor
Mike
Mike
You bet, and SC at dry-ice temperatures would be better still!scareduck wrote:Superconductivity at liquid nitrogen temperatures would be a big improvement over liquid helium temperatures.KitemanSA wrote:What interests me is the recent indications of superconductivity near 200K. That should be quite easy to support. Not room temperature, but a lot closer than 77K.
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assuming you don't use dry ice, solids are hard to pump, I'd wager.KitemanSA wrote:You bet, and SC at dry-ice temperatures would be better still!scareduck wrote:Superconductivity at liquid nitrogen temperatures would be a big improvement over liquid helium temperatures.KitemanSA wrote:What interests me is the recent indications of superconductivity near 200K. That should be quite easy to support. Not room temperature, but a lot closer than 77K.
The pursuit of knowledge is in the best of interest of all mankind.
True.Professor Science wrote:assuming you don't use dry ice, solids are hard to pump, I'd wager.KitemanSA wrote:You bet, and SC at dry-ice temperatures would be better still!
In the NASA... forum that preceded this one there was a long discussion on using certian electronics cooling fluids as a preference to LN because they have a much higher specific heat, but it turns out they get gloppy at LN temperatures. I suspect they would be a lot less viscous at 200K than 77k.
Assuming dry ice as a refrigerant, alcohol or acetone might be circulated for heat transfer. But in any case, the higher your superconductor operating temperature, the easier the refrigeration.Professor Science wrote:Assuming you don't use dry ice, solids are hard to pump, I'd wager.KitemanSA wrote:You bet, and SC at dry-ice temperatures would be better still!
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acetone as a thermally conductive medium
Back in college I wandered past a lab and saw some friends goofing around with dry ice and acetone. They did most of the same fun things (e.g. shattering roses) you see done with liquid nitrogen.Assuming dry ice as a refrigerant, alcohol or acetone might be circulated for heat transfer.
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to be fair liquid nitrogen is somewhat overkill for things like that, as it's at 70 K, while dry ice would probably be around 220 K, maybe a bit lower. water freezes spontaneously at 233 K and the acetone likely just provided something to conduct the heat to and from readily.
edit: OK, bad use of the term spontaneously, i meant without crystaline seed. water can be chilled considerably below 0 celsius if it doesn't have something to form a crystal around. example.
edit: OK, bad use of the term spontaneously, i meant without crystaline seed. water can be chilled considerably below 0 celsius if it doesn't have something to form a crystal around. example.
The pursuit of knowledge is in the best of interest of all mankind.
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I was working off of -50 celsius, guess i had a trivia point mis memorized. to be fair, the only time i needed a specific temperature on it was to figure out if i could use it as a coolant for my super chilled water runs and when i found out it was too cold i disregarded it all together.
The pursuit of knowledge is in the best of interest of all mankind.