Method and device for measuring the freezing point lowering
AssigneeKyoto Daiichi Kagaku Co., Ltd.
InventorTakatoshi Uchigaki
Life of this patent
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Abstract
A method and device for measuring the osmotic pressure on the basis of an improved supercooling process, whereby and wherein cryohydrate nuclei are made to generate almost spontaneously in a part of a sample liquid by cooling the above part down further to a temperature (to an extra-supercooled state) lower than the temperature of a supercooled state, wherethrough the sample liquid as a whole is induced to freeze statically. Because of a non-necessity of using any stirring rod, it becomes possible to design a small-sized device, to reduce the sample liquid to be used to a possible infinitesimal, and further to perform the continuous measurement with the aid of the adoption of a flow cell.
Claims14
A method for measuring a freezing point, comprising the steps of:
- reducing the temperature of a sample liquid to a temperature representing a supercooled state;
- generating cryohydrate nuclei in a portion of said sample liquid by cooling said portion to a temperature lower than the temperature of said supercooled state, thereby to freeze said sample liquid using the cryohydrate nuclei as a freezing stimulant;
- and
- measuring the subsequent thermal arrest point of said sample.
An apparatus for measuring a freezing point comprising
- a container for holding a sample liquid;
- means for cooling all of the liquid of the sample to a temperature representing a supercooled state;
- means for cooling a portion of the sample to a temperature lower than the temperature of said supercooled state thereby to generate cryohydrate nuclei in said portion as a freezing stimulant to freeze the sample;
- and
- means for measuring the subsequent thermal arrest point of the sample.
Dependencies are inferred from the claim text.