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2. How a membrane works
An artificial membrane with selective permeability is a material barrier which, under the action of an acting force, allows substances to be selectively stopped or passed between the two volumes it separates . The permeability of the membrane, characterized by the transmembrane flux, is directly related to the intensity of this force.
Depending on whether the force consciously applied is due to a pressure gradient, an electrical potential gradient or a chemical potential gradient, often assimilated to a concentration gradient, the industrial operation carried out with an artificial membrane constitutes a pressomembrane,...
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How a membrane works
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In Engineering Techniques
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The Ultimate Scientific and Technical Reference