How does the frozen -dried sample formed ice flowers?

When you use a frozen dryer in the laboratory, there are many water solutions to produce ice flowers during the pre -frozen process, that is, a piece of water pattern, or irregular water pattern. We call this ice flower.

So how does Binghua produce?

Ice flower, also known as "fog".

In nature, the ice crystals and water droplets formed on the ground objects are not all frost and dew. There are some seemingly frost and exposed phenomena, but they are caused by other weather conditions.

In fact, ice flowers, like ice cubes and snowflakes, are all forming ice crystals formed by the water (below 0 ° C). This ice crystal is hexagonal. In layman's terms, they are all formed by cold.

For example, the original temperature was low, and the temperature of various ground objects was lower. In the encounter, the weather is sharp and warmed (for example, the temperature rises 10 ° C), but some large and heavy objects cannot suddenly become as warm as the surrounding air. In this way, a relatively large one is formed between the air and these objects. Temperature difference. If the temperature is below 0 ° C at this time, ice crystals will be formed on an object, which is called "hardness". If the temperature is above 0 ° C, it will condense into water droplets on the surface of the object, called "water". The formation of "window cream" and "water" on the glass windows in winter are similar.

When the room temperature difference is too large, the water vapor will directly change from the gesture to the solid state, which is called condensation, so the "ice flower" appears that due to the decrease in temperature, the saturated vapor pressure will be reduced, and the water vapor will exceed the saturation state, so it is condensed into it into it into Binghua. If the temperature is not very low, then the water vapor will condense into water. If the temperature is low enough, then the water vapor will be condensed into frost.