| 摘要 |
A specimen chamber for storing materials in a dewar vessel that uses liquid cryogen is made of an open-celled porous thermoplastic material that is cryogenically compatible, such as an aerated polypropylene foam. The specimen chamber allows liquid cryogen to pass through it into a plastic foam and allows liquid cryogen in a vapor phase liquid state to pass from the plastic foam into it. The thermoplastic material of the specimen chamber acts as a filter to prevent particles or fragments of plastic foam from entering into the specimen chamber and also acts as a wicking device for rapid transfer of the liquid cryogen to the plastic foam.
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