Is there a structure so efficient at sinking heat it can freeze water?

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Offline thedoc

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Woody asked the Naked Scientists:
   
Is there a material and/or structure that is so efficient at sinking heat that it can passively freeze water?

What do you think?
« Last Edit: 16/10/2014 22:30:02 by _system »

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Offline syhprum

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No structure is required if an area of water is facing the cold of space with no cloud cover and no incoming heat from the ground it will freeze.
no heat sink can extract heat from water unless it is cooled in some way that would make the building of a much longed for perpetual motion machine child's play 
syhprum

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Offline evan_au

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Dry Ice (solid CO2) will freeze water.

It does it "passively" in the sense that there is no external injection of energy or extraction of heat from the dry ice+water system.

But it can only keep cooling water until the dry ice is exhausted, and the system reaches a uniform temperature. This will eventually happen if you keep pouring in warm water (it takes a lot of dry ice to freeze a small amount of water).

Can you clarify what you mean by "passively"?