Eisurjektio

Eisurjektio is a theoretical technique in cryogenic materials science that describes the controlled injection of ice or ice-rich slurry into a solid matrix to modify its internal structure.

The method uses a cooled aqueous medium delivered at controlled pressure to fill pores or microfractures. Once in place, the water is frozen in situ, and the resulting ice expands by about 9 percent, generating tensile stresses that can open, widen, or propagate cracks. Reversing the process, by thawing or by warming above the freezing point, can relax stresses and alter porosity.

The technique requires specialized cryogenic equipment, precise temperature control, and careful monitoring of stresses to prevent uncontrolled failure. It is most applicable to brittle or porous materials with accessible pore networks; dense solids may resist infiltration.

In theory, Eisurjektio could be used to study fracture mechanics, to tailor pore structure for catalysis or insulation, or to model freeze-induced damage in soils. It remains exploratory, with limited experimental validation and no widespread industrial adoption.

The name combines Eis, the German word for ice, with injektio, a Latinized form of injection. The term appears in a small number of theoretical writings and speculative discussions rather than standard reference works.

See also: ice templating, freeze casting, cryogenic injection, porosity engineering.