The direct measurement of temperature changes within freeze‐fracture specimens during rapid quenching in liquid coolants

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Abstract
We have evaluated the cooling rates of specimens mounted in a variety of freeze-fracture holders when plunged into a series of liquid coolants. These rates were measured using miniature thermocouples placed within the mounted specimens. The most rapid cooling rates were obtained using propane at 83 K as the coolant. When mounted on a newly devised ‘copper sandwich’ holder, specimen cooling rates in excess of 4500 K/s have been recorded. A simple guillotine-like device for quenching freeze-fracture specimens under reproducible conditions is presented.