Apparatus for making dynamic measurements of solid surface areas

Details Apparatus for making dynamic measurements of solid surface areas Apparatus for making dynamic measurements of solid surface areas

1984-05-03

1985-07-16

Swisher, S. Clement

Measuring and testing

Miscellaneous

G01N 702, G01N 1508

Patent

active

045288500

ABSTRACT:
An apparatus applying the dynamic BET-type approach to the measurement of solid surface areas, allowing the pressure on the sample to be varied from a lower, subatmospheric value to a plurality of upper values either greater than or less than atmospheric pressure. Apparatus comprises, in the order of their appearance from upstream to downstream, the following parts: a source of a mixture of gaseous adsorbate and non-adsorbable gas, a pressure reducing valve, a reference circuit and a measurement circuit arranged in parallel, said measurement circuit incorporating a sample holding a cell and both said circuits going through a katharometer, then converging into a vacuum pump. A flow control valve is installed upstream from the sample holding cell and a throttling valve is inserted between said sample cell and the katharometer.

REFERENCES:
patent: 3211006 (1965-10-01), Haley, Jr.
patent: 3211007 (1965-10-01), Atkins
patent: 3555912 (1971-01-01), Lowell
patent: 3850040 (1974-11-01), Orr, Jr. et al.

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