A membrane's a layer of material which serves as a selective barrier between two phases and remains impermeable to specific particles, molecules, or substances when exposed to the action of a driving force. Some components are allowed passage by the membrane into a permeate stream, whereas others are retained by it and accumulate in the retentate stream. Membranes can be of various thickness, with homogeneous or heterogeneous structure. Membrane can also be classified according to their pore di… (More on Membranes)