Particles, mainly salts, with specific dimensions are then added to the solution.
The mixture is shaped into its final geometry.
For example, it can be cast onto a glass plate to produce a membrane or in a three-dimensional mold to produce a scaffold.
When the solvent evaporates, it creates a structure of composite material consisting of the particles together with the polymer.
The composite material is then placed in a bath which dissolves the particles, leaving behind a porous structure.