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Cryocrystallography: effect of cooling medium on sample cooling rate
Author(s) -
Walker Linda J.,
Moreno Phillip O.,
Hope Håkon
Publication year - 1998
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889898005299
Subject(s) - silicone rubber , propane , thermocouple , analytical chemistry (journal) , materials science , reproducibility , chemistry , composite material , chromatography , organic chemistry
The rates of cooling of small samples with cold N 2 gas (100 K), liquid N 2 (77 K) and liquid propane (100 K) have been measured. The samples were one bare Cu‐constantan thermocouple and one coated with a 0.25 mm layer of silicone rubber cement. Gas cooling yielded the lowest rate, liquid N 2 the highest. With the gas, cooling of the centers of the samples from 295 to 140 K took 0.8 and 2 s for the bare and coated samples, respectively; with liquid N 2 the times were 0.15 and 0.6 s, and with liquid propane they were 0.15–0.18 and 1.2 s, respectively (time reproducibility is within ±10%).