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How to store liquid water at sub-zero temperatures

17.08.2018

Researchers at a hospital in Boston (USA) have come up with an inexpensive way to store liquids at sub-zero temperatures in a liquid state. The method allows to improve the conditions of blood storage.

It is known that water crystallizes at negative temperatures. However, the existing methods of supercooling are short-term, and they are very expensive. The invented method is simple and cheap, effective within a few days. Scientists have called it "deep hypothermia."

The bottom line is that the surface of the liquid is separated from the air by a special substance. In this case, the composition does not mix with water.

The discovery happened by chance: the researchers noticed how, when sealing the top layer of water with a film of carbon-based oil (olive or palm), the liquid did not freeze even at temperatures below 13 degrees Celsius. When using more complex oils, the liquid remains in such a substance for about 100 days at a temperature of minus 20.

A similar method applies to blood content. Previously, it could be stored for six weeks at a temperature of four degrees Celsius, the new method allows you not to change the structure of the blood for 100 days at minus 13. Now scientists hope to adapt a new method for storing organs.

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