Nanofiltration membranes and methods of using and making thereof are disclosed. The nanofiltration membranes contain a silk layer, a porous substrate, and a selective layer. The silk layer is an interlayer sandwiched between the porous substrate and selective layer. The nanofiltration membranes have high performance for filtering water, such as improved water permeance and/or high ion removal rate. For example, the nanofiltration show a water permeance that is at least 2-fold, such as about 5-fold, of the water permeance of a commercially available nanofiltration membrane, such as DuPont FilmTec? NF270 and/or DuPont FilmTec? NF90, and an ion rejection of at least 70% against a target ion, such as a divalent or multivalent ion. The greatly improved water permeance of the nanofiltration membranes can result in up to a magnitude lower energy consumption in water filtration applications.

The present invention relates to a composite membrane comprising at least one 2D material and an inorganic porous material. The composite membrane described herein may be housed within a separation device which may be used for selective permeation of one or more gaseous compounds.

Filter media having a relatively small pore size and related components, systems, and methods associated therewith are provided. The filter media may include a fibrous efficiency layer, a fibrous support layer, and a third layer adjacent to the efficiency layer. The efficiency layer may impart a relatively homogeneous pore structure to the filter media without adding substantial bulk to the filter media. The support layer may promote the homogeneity of the pore structure. For example, the support layer may prevent and/or minimize defects in the relatively thin efficiency layer that may result from manufacturing and/or processing. The third layer may serve to impart beneficial filtration (e.g., efficiency, dust holding capacity) and/or non-filtration (e.g., layer protection) properties to the filter media without adversely affecting one or more properties of the filter media. Filter media, as described herein, may be particularly well-suited for applications that involve liquid filtration, amongst other applications.

An electrolyte membrane with a backsheet is sent out from an electrolyte membrane unwinding roller, and is separated with its second side sucked on a suction roller by a first press roller. While the electrolyte membrane from which the backsheet has been separated is transported with the electrolyte membrane sucked and supported on the suction roller, an electrode ink is applied to a first side of the electrolyte membrane to form an electrode ink layer, which is dried by blowing hot air thereto to form a catalyst layer. Thereafter, in a state in which the outer surface of a second press roller disposed close to the suction roller is in contact with and supported on the first side of the electrolyte membrane, a support film is pressed against the second side of the electrolyte membrane by a third press roller and attached thereto to manufacture a catalyst-coated membrane.

Provided is a reverse osmosis membrane using a hydrophilized polyolefin-based microporous membrane.

A reverse osmosis membrane according to the present invention may provide a large treatment area per unit volume by using a thin film type support, thereby improving water treatment performance.

A filter medium is provided. The filter medium according to an embodiment of the present invention comprises: a first support body having a plurality of pores; a nanofiber web comprising nanofibers disposed on upper and lower sides of the first support body and forming a three dimensional network structure; and a second support body having a plurality of pores interposed between the first support body and the nanofiber web, wherein the nanofiber web is realized as a filter medium that satisfies: (1) an elongation of 25% or more, (2) an air permeability of 0.1 to 2.00 cfm, and 3) porosity of 60%85%. Accordingly, since the filter medium has a fixed level of mechanical properties of the nanofiber web, the shape, structure deformation, and damage of the filter medium are minimized and a flow path is smoothly secured during a water treatment operation so that the filter medium can have a high flow rate. In addition, since the filter medium of the present invention has a prolonged use life due to excellent durability of the filter medium even at high pressure applied during backwashing, and has excellent filtration efficiency and water permeability, the filter medium can be applied in various ways in various water treatment fields.

The present invention relates to an ion exchanging membrane, a method for manufacturing the same, and an energy storage system comprising the same. The ion exchanging membrane includes a porous support including a plurality of pores, a first ion conducting material located on one surface of the porous support, and a second ion conducting material located on the other surface of the porous support, in which the first ion conducting material and the second ion conducting material are polymers including hydrophilic repeating units and hydrophobic repeating units, and the first ion conducting material and the second ion conducting material have different molar ratios of the hydrophilic repeating units and the hydrophobic repeating units.

According to the ion exchanging membrane, it is possible to improve overall efficiency of the energy storage system by improving both performance efficiency and voltage efficiency of the energy storage system due to excellent ion-conductivity performance and reduced membrane resistance and ensure durability of the energy storage system by having excellent morphological stability and reducing a crossover of vanadium ions.

A polyolefin microporous membrane is disclosed. The membrane has a width of not less than 100 mm, and a variation range of an F25 value in a width direction is not greater than 1 MPa. The F25 value is a value obtained by dividing a load at 25% elongation of a sample of the laminated polyolefin microporous membrane as measured with a tensile testing machine by a cross-sectional area of the sample.

The purpose is to produce a molded filter body using graphene having water passage holes with a desired size by an easy process. A method for producing a molded filter body having a layer of graphene 2 as a filter medium, includes the steps of: forming a layer of a support 5 on a surface of graphite 1; forming support water passage holes in the layer of the support 5; peeling the layer of the support 5 from the graphite 1 in a state of attaching the layer of graphene 2 on the surface of the graphite 1 to the layer of the support 5; and holding the layer of graphene 2 by heating at a low temperature for a predetermined time in the air containing oxygen at 160 to 250 C. and forming graphene water passage holes.

The invention relates to a membrane, and method of manufacture of a membrane for reverse osmosis having a porous substrate, and a layer adjacent the porous substrate comprising a two dimensional nanosheet material and crosslinked polymer. The two dimensional nanosheet material is preferably chosen from the group comprising graphene oxide including reduced graphene oxide, holey graphene, holey graphene oxide, laminated graphene oxide and holey reduced graphene oxide.