Effects on rapid cooling of small samples in quenching.

Abstract:

:Rapid cooling of small samples is necessary both to cryofixation for electron microscopy and to vitrification for cryopreservation. Several effects on the cooling rates of small samples quenched into liquid nitrogen were studied, including the diameter of samples, the subcooling of liquid nitrogen, the quenching speed, and the quenching distance. The heat flux is 1.4 x 10(6) W/m2; the cooling rate is also up to 8200 K/s at the CHF point of boiling curves for sphere of diameter 0.287 mm quenching into subcooled liquid nitrogen. It is also found that if the time of sample moving inside the liquid nitrogen is not longer than the time required for forming stable vapor in the liquid, the quenching boiling heat transfer is not influenced by the quenching speed. Several equation for calculating heat flux of samples are also presented.

journal_name

Ann N Y Acad Sci

authors

Cao Q,Hua TC

doi

10.1111/j.1749-6632.1998.tb10160.x

subject

Has Abstract

pub_date

1998-09-11 00:00:00

pages

262-9

eissn

0077-8923

issn

1749-6632

journal_volume

858

pub_type

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