SEMI-PERMEABLE MEMBRANE, METHOD FOR PROVIDING ELECTRIC POWERAND A DEVICE

摘要

The present invention concerns a semi-permeable membrane consisting of one thin layer of a non-porous material(the diffusion skin), and one or more layers of a porous material (the porous layer), where the porous layer has a structure where porosity .phi., pore length x(m), and tortuosity .tau., are related to one another as given by the expression: x .tau. = .phi. S wherein S is a structure parameter. Further a method for providing elevated pressure b y osmosis as well as a device for providing an elevated osmotic pressure and electric power is described.