There are three major indicators to measure the properties of porous membranes: porosity, trapped pore size and pore size variance.
Porosity refers to the ratio of the sum of the pore areas in the membrane surface to the area of the entire membrane. The level of porosity determines the level of permeability.
To ensure a high permeability rate, the porosity is required to be as high as possible. However, in order to maintain a certain mechanical strength, the porosity of the membrane is also subject to certain limitations.
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