Membranes, methods of making the membranes, and methods of using the membranes are described herein. The membranes can comprise a gas permeable support layer, an inorganic layer disposed on the support, the inorganic layer comprising a plurality of discreet nanoparticles having an average particle size of less than 1 micron, and a selective polymer layer disposed on the inorganic layer, the selective polymer layer comprising a selective polymer having a CO.sub.2:N.sub.2 selectivity of at least 10 at 57 C. In some embodiments, the membrane can be selectively permeable to an acidic gas. The membranes can be used, for example, to separate gaseous mixtures, such as flue gas.

The present invention is a structure, method of making and method of use for a novel macroscopic hierarchically structured, nitrogen-doped, nano-porous carbon membrane (HNDCMs) with asymmetric and hierarchical pore architecture that can be produced on a large-scale approach. The unique HNDCM holds great promise as components in separation and advanced carbon devices because they could offer unconventional fluidic transport phenomena on the nanoscale. Overall, the invention set forth herein covers a hierarchically structured, nitrogen-doped carbon membranes and methods of making and using such a membranes.

One or more embodiments relate to providing substrate for separating a first gas component from a gaseous mixture, said substrate comprising a benzimidazole-linked polymer. Also provided is a method for synthesizing a substrate for separating a first gas component from a gaseous mixture, the method comprising performing a free condensation reaction between an aryl-o-diamine and an aryl-aldehyde to yield a benzimidazole-linked polymer. Other embodiments related to providing a CO.sub.2 separation membrane comprising benzimidazole-linked polymer residing within a matrix.

A polymerizable composition for forming an ion-exchange resin precursor, the polymerizable composition containing a monomer component and polyethylene particles in an amount of 50 to 120 parts by mass per 100 parts by mass of the monomer component, wherein the monomer component contains an aromatic monomer for introducing ion-exchange groups and a nitrogen-containing aliphatic monomer, the nitrogen-containing aliphatic monomer being present in an amount of 10 to 35% by mass in said monomer component. An ion-exchange membrane is produced by applying the polymerizable composition onto a polyolefin type filament base material and polymerizing the polymerizable composition to form an ion-exchange resin precursor and, thereafter, introducing ion-exchange groups into the precursor.

A hand-carry gravity-driven water filter with high throughput and water disinfection performance is formed. Membranes used for this water filter can be fabricated using electrospun method and non-solvent induced phase inversion method. A novel composite membrane structure (interwoven composite structure) was designed for further enhances water permeability and mechanical strength. The composite membrane can be composed of nanofibers with different diameter from the same polymer or different polymers. Membrane porosity and surface pore size can be controlled. Silver nanoparticles can be in-situ loaded on the surface of the membranes. The developed filter is effective for removal of a wide range of contaminants (e.g., pathogens, suspended solids and heavy metals). The purification process can be carried out under the drive of gravity (with an option for mechanically-enhanced filtration) without electricity.

A nanocomposite including a mesoporous, macroporous, or a combination thereof oxide and a zeolitic imidazolate framework (ZIF) that is filling the pores of the oxide to form a ZIF phase embedded and at least substantially confined mostly within the oxide. Methods of making nanocomposites including the steps of depositing an oxide in the pores of a mesoporous oxide; and further treating the resulting material with vapor, liquid, or supercritical CO.sub.2 comprising an azole-based compound, a carboxylate based compound, or a combination thereof. Use of disclosed articles to separate propylene and propane in a mixture thereof.

The present disclosure belongs to the technical field of membrane separation, and discloses a preparation method of a Ti.sub.3C.sub.2T.sub.x MXene quantum dot (MQD)-modified polyamide (PA) reverse osmosis (RO) membrane. The preparation method includes the following steps: subjecting a Ti.sub.3C.sub.2T.sub.x MXene material to liquid nitrogen intercalation and interlayer expansion to obtain a Ti.sub.3C.sub.2T.sub.x MQD nanomaterial; preparing an aqueous phase solution with the Ti.sub.3C.sub.2T.sub.x MQD nanomaterial and an organic phase solution; soaking an ultrafiltration (UF) base membrane in the aqueous phase solution , and removing the aqueous phase solution on a surface of the UF base membrane through blow-drying; soaking the second UF base membrane in the organic phase solution to allow interfacial polymerization to form an active layer; and allowing a composite membrane obtained after the interfacial polymerization to stand, followed by a heat treatment to further promote the interfacial polymerization.

Described herein are mixed matrix filtration membranes and related, dendrimers, dendrimer particles, compositions, methods and systems and in particular mixed matrix filtration membranes with an embedded dendrimer particles and related compositions, methods, and systems wherein each dendrimer particle comprises at least two dendrimers each having at least two core chemical moieties having a core multiplicity Nc; branch cell units attached to the core chemical moiety or one to another, with the branch cell units attached one to another having a branch cells multiplicity Nb; and a number of surface functional groups Z presented on terminal branch cell units, wherein Z=NcNb.sup.G with G?3.

Water-filtration compositions, membranes, devices, and manufacturing processes including graphene oxide with hydrophilic functional groups. Disclosed are a composition comprising graphene oxide with an average particle diameter of no more than about 1 ?m and has an oxygen atomic percentage of at least about 30%, a membrane comprising the composition, a water-permeable device comprising the membrane, a method of making the membrane using the composition, and several methods of generating the composition.

A monolayer, bilayer, trilayer, or multilayer porous membrane having at least one layer that contains a thermoplastic resin and a polymer that is incompatible with the thermoplastic resin. One structure is a multilayer porous membrane where at least one internal layer of the multilayer porous membrane contains the thermoplastic resin and the polymer that is incompatible with the thermoplastic resin. Higher amounts of incompatible polymer may be used in an internal layer. This structure has improved properties, including improved puncture strength. Another structure includes at least one layer containing polyethylene and a polymer that is incompatible with polyethylene. The at least one layer containing polyethylene and a polymer that is incompatible with polyethylene may be an internal layer or an external layer. An internal layer may include more incompatible polymer than an external layer. The porous membranes may be used as battery separators. For example, they may be used as battery separators in secondary batteries such as lithium ion secondary batteries.