Thermodynamic process
Directional freezing freezes from only one direction.
Directional freezing can freeze water, from only one direction or side of a container, into clear ice. ;ref name="alcademics/doesnt" ; ;/ref ; ;ref name="alcademics/what" ; ;/ref ;
Directional freezing in a domestic freezer can be done by putting water in a insulated container so that the water freezes from the top down, and removing before fully frozen, so that the minerals in the water are not frozen.
F Hoffmann La Roche AG, Roche Diagnostics GmbH has a 2017 directional freezing patent for drying solid material. ;ref name="google/patent/EP2877795B1" ; ;/ref ;
References.
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