Method for freezing-point determination

Details Method for freezing-point determination Method for freezing-point determination

1984-06-06

1987-04-14

Frankfort, Charles

Thermal measuring and testing

Transformation point determination

By thermal arrest

374 16, G01N 2504

Patent

active

046574093

ABSTRACT:
A method for measuring the freezing point of a liquid utilizing non-adiabatic thermodynamics for the chilling chamber. The temperature of the chilling chamber in which the measurement is made is actively altered to reduce net heat flow from the sample portion of the liquid being measured at least during nucleation of the sample portion. By actively altering the chilling-chamber temperature, the thermodynamics of the sample itself more nearly approach a true adiabatic condition during nucleation. Preferably, the freezing-point measurement is made in the sample-handling or pick-up device itself.

REFERENCES:
patent: 3150515 (1964-09-01), Malina
patent: 3203226 (1965-08-01), Fiske, Jr.
patent: 3263487 (1966-08-01), Fiske, Jr.
patent: 3667280 (1972-06-01), Simpson
patent: 4248830 (1981-02-01), Kallies et al.
patent: 4299795 (1981-11-01), Bates
patent: 4304119 (1981-12-01), Uchigaki
patent: 4484822 (1984-12-01), Hancock
Prager et al. "Freeze-Point Depression: New Method for Measuring Ultramicro Quantities of Fluid," in Science, 10/63, vol. 142, No. 3589, pp. 237-239.
Abele, "The Physical Background to Freeze Point Osmometry-its Medical Biological Applications", American Journal of Medical Electronics, Jan.-Mar. 1963, vol. 2, No. 1, pp. 32-41.

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