Functionalized membranes are produced via grafting of polymer brushes to the membrane surface for use, e.g., in separation and purification of biomolecules. One or more initiators are attached to the membrane surface. A reactant substrate, such as a copper metal plate, is placed adjacent the membrane. A reaction medium is then provided in fluid contact with the membrane and the reactant substrate, the reaction medium including one or more monomers, one or more ligands, and one or more solvents. The polymer brushes are grown on the membrane via Cu(0)-mediated controlled radical polymerization involving the reactant substrate and the reaction medium. This reaction process uses fewer numbers and amounts of chemicals compared to other controlled radical polymerization reactions such as ATRP. The reaction can take place at room temperature, which is more energy efficient than other CRPs which occur at a much higher temperatures. The reaction process described herein is also sixteen times faster than the standard ATRP method without sacrificing subsequent separation performance.

The present invention provides composite particles which are capable of forming an ion exchange membrane with fewer defects and an ion exchange membrane. The composite particles according to the present invention comprise pellets comprising a fluorinated polymer having groups convertible to ion exchange groups, and a powder held on the pellet surface which comprises a polymer, wherein the powder has an average particle diameter of at least 1 μm and at most 1,000 μm, and the ratio of the average particle diameter of the pellets to the average particle diameter of the powder is 2 to 4,500.

The present disclosure is directed to methods and systems of purifying solvents. The purified solvents can be used for cleaning a semiconductor substrate in a multistep semiconductor manufacturing process.

The invention relates to porous polymeric cellulose prepared via cellulose crosslinking. The porous polymeric cellulose can be incorporated into membranes and/or hydrogels. In preferred embodiments, the membranes and/or hydrogels can provide high dynamic binding capacity at high flow rates. Membranes and/or hydrogels comprising the porous polymeric cellulose are particularly suitable for filtration, separation, and/or functionalization media.

The present invention relates to a method for removing metal ions from an aqueous system comprising a step of filtering the aqueous system through a loaded membrane which contains a carrier membrane based on a polyarylene ethersulfone which carries anionic groups, and a cationic polymer which is a polymer comprising primary and/or secondary amino groups. The invention further relates to a loaded membrane which contains a carrier membrane based on a polyarylene ethersulfone which carries anionic groups, and a cationic polymer which is a polymer comprising primary and/or secondary amino groups.

The present invention provides a composition comprising an organic compound having an acid dissociation constant in a 25° C. aqueous solution of 5.0 to 15.0, a hydrophilic resin, and a basic compound, wherein a content of the organic compound is 30 to 1,000 parts by weight per 100 parts by weight of the hydrophilic resin.

The present disclosure is concerned with negatively charged filtration membranes and methods of making and using same, for example, in the concentration and/or filtration of dairy products. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Cation exchange membranes and materials including silica-based ceramics, and associated methods, are provided. In some aspects, cation exchange membranes that include a silica-based ceramic that forms a coating on and/or within a porous support membrane are described. The cation exchange membranes and materials may have certain structural or chemical attributes (e.g., pore size/distribution, chemical functionalization) that, alone or in combination, can result in advantageous performance characteristics in any of a variety of applications for which selective transport of positively charged ions through membranes/materials is desired. In some embodiments, the silica-based ceramic contains relatively small pores (e.g., substantially spherical nanopores) that may contribute to some such advantageous properties. In some embodiments, the cation exchange membrane or material includes sulfonate and/or sulfonic acid groups covalently bound to the silica-based ceramic.

A separation membrane sheet that causes a specific fluid component to selectively permeate therethrough, comprises: a first porous layer; and a resin composition layer formed on the first porous layer. The resin composition layer has a filtration residue fraction of greater than or equal to 20% and less than or equal to 90%; and contains a resin having an ionic group or a salt thereof, and has an ion exchange capacity of greater than or equal to 1 millimole equivalent per 1 g of a dry resin in a filtration residue.

A method of encapsulating an engineered pellet in a porous membrane is disclosed. The method includes the steps of: (i) dissolving a membrane solute in a membrane solvent to produce a membrane solution; (ii) applying the membrane solution to a pellet to form a pellet encapsulated with the membrane solution; (iii) subjecting the membrane solution that encapsulates the pellet to a phase inversion and; (iv) drying the pellet to form a porous membrane encapsulated pellet. A porous membrane encapsulated pellet is also described.