Freeze drying

Usage

  • Dries samples at low temperature (-45 oC), under vacuum

Principle

Freeze drying is a dehydration process where wet material is placed in a chamber where pressure can be decreased, allowing the water in the material to sublimate directly from the solid phase to the gas phase. The surface tension of ice is much lower that of liquid water so freeze drying does not usually cause clumping, shrinkage or toughening of the material being dried.

Freeze drying