Abstract: Disclosed is a nanoporous membrane including a porous support layer and a selective layer. The selective layer, being deposited on a surface of the porous support layer, has an effective pore size smaller than that of the porous support layer and contains an array of polymeric nanoparticles that have on their surfaces a plurality of —C(?O)XR groups. Also disclosed are methods of fabricating a nanoporous membrane described above and using the nanoporous membrane for separating a mixture that contains two solutes.

Abstract: A two-layer membrane including a polymer layer and a support layer, the polymer layer being disposed on a surface of the support layer. The polymer layer, having a pore size of at most 50 nm and a thickness of 5 nm to 10 ?m, is formed of an amphiphilic copolymer that contains both charged groups and hydrophobic groups. The support layer has a pore size of 3 nm to 10 ?m, which is larger than the pore size of the polymer layer. Also disclosed is a process of filtering a liquid using the two-layer membrane described above.

Abstract: A method for coating a porous support with a thin membrane selective layer via interfacial free-radical polymerization. The method is carried out by immersing a porous support in a monomer-containing solution, removing the porous support from the solution, covering the porous support with a second solution immiscible with the first solution, the second solution containing a polymerization initiator, activating the initiator to effect polymerization of the monomer, and washing the porous support having the membrane selective layer. Also disclosed are membranes prepared by the method and filtration methods using the membranes.

Abstract: A two-layer membrane including a polymer layer and a support layer, the polymer layer being disposed on a surface of the support layer. The polymer layer, having a pore size of at most 50 nm and a thickness of 5 nm to 10 ?m, is formed of an amphiphilic copolymer that contains both charged groups and hydrophobic groups. The support layer has a pore size of 3 nm to 10 ?m, which is larger than the pore size of the polymer layer. Also disclosed is a process of filtering a liquid using the two-layer membrane described above.