I never seem to get tired of that. Here is a frozen surface of toluene:
And a final slush with an apparatus:
Wednesday, January 17, 2007
Toluene/liquid nitrogen slush bath
Today I needed -95C temperature, so it was a good occasion to take some pictures of slush bath being made. As you pour liquid nitrogen in a "hot" (room temperature) solvent, it rapidly evaporates, producing very low temperatures in the gas phase and freezing bath solvent vapors, forming this white mist: 
I never seem to get tired of that. Here is a frozen surface of toluene:
And a final slush with an apparatus:
I never seem to get tired of that. Here is a frozen surface of toluene:And a final slush with an apparatus:
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3 comments:
I had seen the solid state, but not the mist. Great captures! What are you using this system for?
Thanks! It's a constant-temperature bath, for cryocooling. In case when the coolant you use provides a lower temperature then the one you need, you need to use the slush bath to get stable temperature. As long as the bath has both solid and liquid phases (that's why it's called "slush") of the solvent, the temperature will be constant (it's a system with one degree of freedom). This way you can generate and sustain the whole range of temperatures from RT to -196C (if you are using liquid nitrogen) by picking a solvent with the right melting point.
Hi I am an embryologist and I need to produce liquid nitrogen slush. Do you know how to produce it ? Need help please. (ativet@gmail.com)
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