Method for dehydration and critical point drying
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United States of America Patent
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Sep 8, 2020
Grant Date -
Jun 27, 2019
app pub date -
Dec 21, 2018
filing date -
Dec 22, 2017
priority date (Note) -
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Abstract
A method for dehydration and critical point drying of a sample in a single chamber is introduced, comprising the steps of (a) dehydrating the sample by replacing water by an intermediate fluid, (b) replacing the intermediate fluid by a transitional fluid, (c) pressurising the transitional fluid to or beyond its critical pressure and/or heating the transitional fluid (4 to or beyond its critical temperature, and (d) in response to gradually releasing the pressure, letting the transitional fluid gasify and escape from the sample. In step (a) and/or step (b), a ratio of the fluid to-be-replaced to the replacing fluid is measured and used to control a supply of the replacing fluid.
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