A composite electrolyte film includes a composite electrolyte layer including: a first domain including a plurality of two-dimensional nanostructures, and a second domain which is disposed in an interstitial space between neighboring two-dimensional nanostructures of the plurality of two-dimensional nanostructures, wherein the plurality of two-dimensional nanostructures includes a first electrolyte.

A spiral separation membrane element includes a water collection tube; a separation membrane wound around the water collection tube, having a feed-side surface and a permeate-side surface, and including a band-shaped region on at least one end of the feed-side surface in an axial direction of the water collection tube; and a channel material fused to the band-shaped region.

Provided is a hydrophilic porous membrane including a porous membrane and a hydroxyalkyl cellulose (preferably, hydroxypropyl cellulose) retained in the porous membrane, the hydroxyalkyl cellulose having a weight-average molecular weight of 10,000 or more and less than 110,000. The hydrophilic porous membrane of embodiments of the invention has high water permeability and can pass an integrity test in the case of being used as a filtration membrane of a filter cartridge. Also provided is a method for producing the above-mentioned hydrophilic porous membrane, the method comprising causing a hydrophilizing liquid including 0.005% to 0.500% by mass of a hydroxyalkyl cellulose having a weight-average molecular weight of 10,000 or more and less than 110,000, to permeate a porous membrane.

A membrane for fluid species transport includes a porous substrate and a selective-transport layer comprising 2-D-material flakes. The porous substrate defines surface pores with dimensions larger than 2 microns, and the selective-transport layer coats the porous substrate and spans across the surface pores. The porous substrate can be contacted with a liquid or coating to fill or coat the surface pores of the porous substrate. Next, a 2-D-material-flake solution is deposited on the porous substrate. Evaporation of solvent from the deposited 2-D-material-flake solution forms the selective-transport layer.

A filter device includes one or more filter membranes, and a filter housing enclosing the one or more filter membranes. Each of the filter membranes includes a base membrane made of a ceramic material, and a plurality of through holes. The base membrane is coated with a coating material.

Methods for hydrophilizing porous PTFE membranes, and hydrophilized membranes, are disclosed.

A porous membrane comprising PTFE blended with PFSA is disclosed.

The present invention provides a porous polymer flat-sheet membrane for MBR wherein surface of the porous polymer membrane is kept hydrophilic for a long period and high water permeability and anti-fouling properties are kept. A porous polymer flat-sheet membrane for MBR comprising a hydrophobic porous polymer membrane forming a network structure and a sheet substrate supporting it, characterized in that at least surface of the porous polymer membrane is coated and fixed with an insolubilized hydroxypropyl cellulose, that a ratio of the hydroxypropyl cellulose to the porous polymer membrane is 0.4 to 1.0% by weight and that, when NMR spectrum of the hydroxypropyl cellulose coated on and fixed to the membrane is measured using a nuclear magnetic resonance apparatus (proton NMR), an intensity ratio (B/A) of a spectral peak (B) appearing at 4.12 ppm to a spectral peak (A) appearing at 3.75 ppm is 12 to 30%.

A method of making a gas separation membrane by providing a plating vessel with a volume of plating solution of gas-selective metal ions into which is placed a porous support. The plating solution is circulated over a surface of the porous support while maintaining conditions within the plating vessel so as to promote the electroless deposition. The circulation rate of the plating solution is such as to enhance the metal deposition onto the surface of the porous support in the formation of the gas separation membrane.

A thin film composite membrane including a thin film polyamide layer positioned between a porous support and an outer coating, and a humectant; wherein the membrane has an A-value of at least 8 l/m.sup.2 hr/bar when tested at 25 l/m.sup.2 hr with pure water at 25 C. for one hour, and wherein the outer coating comprises a dissolvable cellulose polymer provided at coverage of at least 10 mg/m.sup.2 that substantially dissolves from the membrane after one hour of continuous cross-flow of water at 25 l/m.sup.2 hr and 25 C.