A liquid metal TIM seems more reasonable form the cost end of things than liquid metal as a cooling fluid. Although it does give me a bit of pause -- does it ever cure? How would you clean it? Is it going to squeeze out when pressed into a film under the heatsink, and the little extra become a contaminate in my system?
Wouldn't we be looking at a different set of properties for a TIM than a cooling fluid? Hopefully one of the knowledgeable folks can correct me if I am wrong, but my naive first thought is for a TIM a very low specific heat capacity would be best, whereas cooling fluid would want a very high specific heat capacity.
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