A hollow fiber type semipermeable membrane which achieves both water permeability and selectivity in high level and performs efficient treatment using small membrane area utilizing the concentration difference from high concentration liquid having high osmotic pressure. The hollow fiber type semipermeable membrane is characterized in that, when an aqueous solution of 25? C. having NaCl concentration of 35 g/L and pressure of 1.0 MPa is flown into an outer side of the hollow fiber type semipermeable membrane having length of about 70 cm while freshwater of 25? C. having NaCl concentration of 0 g/L is flown into an inner side of one open end of the hollow fiber type semipermeable membrane and discharged from another open end at 10 kPa or less, the permeation flow rate is 30 to 70 L/m.sup.2/day. An inner diameter thereof is 50 to 200 ?m; and the hollow ratio thereof is 24 to 42%.

The present disclosure relates to a porous membrane and a method of manufacturing the same, and more particularly, to a thermally stable porous membrane capable of securing thermal stability and long-term stability of gas separation performance at high temperatures, and a manufacturing method thereof. This invention is related to a porous membrane comprising: a first Zeolitic Imidazolate Fragments (ZIFs) part formed on a surface of a porous support; and a second ZIFs part embedded in the porous support, wherein the second ZIFs part is formed in a state in which it penetrates from an interface between the first ZIFs part and the second ZIFs part to a predetermined depth.

The present disclosure relates to a highly-permeable microporous thermally crosslinked polymer membrane obtained by thermally crosslinking halogenated aromatic polymers having multiple benzene rings and a halogenated benzene ring, and a preparation method thereof. The microporous thermally crosslinked polymer membrane according to an embodiment of the present disclosure has a dramatically increased free volume, thus enabling excellent gas separation performance, particularly high gas permeability, and improved plasticization resistance, chemical resistance, and durability.

A microporous polymeric composition including a matrix polymer having a fractional free volume of at least 0.1 and dispersed particles having a hypercrosslinked polymer.

A microporous membrane is made by a dry-stretch process and has substantially round shaped pores and a ratio of machine direction tensile strength to transverse direction tensile strength in the range of 0.5 to 5.0. The method of making the foregoing microporous membrane includes the steps of: extruding a polymer into a nonporous precursor, and biaxially stretching the nonporous precursor, the biaxial stretching including a machine direction stretching and a transverse direction stretching, the transverse direction stretching including a simultaneous controlled machine direction relax.

The present invention refers to a process for obtaining reduced graphene oxide (rGO) porous membranes, homogeneous, without cracks, using very low quantities of graphene oxide (GO) nanosheets, highly adhered to the porous support and with high mechanical stability. The obtained rGO membranes present high quality and excellent operational efficiency and can be used in applications involving separation of ionic, molecular and biological species in liquid and gaseous phases, such as the treatment of water and industrial effluents and/or gas purification. Furthermore, the present invention also describes an ideal reactor to make it possible to obtain said reduced graphene oxide membranes obtained by the process described herein.

The present disclosure describes a process of obtaining a carbon membrane derived from polymer polybenzoxazine, for improved separation of gases with different kinetic diameters such as helium (2.60 ), hydrogen (2.89 ), carbon dioxide (3,30 ), oxygen (3.46 ), nitrogen (3.64 ), carbon monoxide (3.70 ), methane (3.80 ), ethylene (4.23 ) and ethane (4.42 ) from the molecular sieving mechanism.

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 microporous membrane is made by a dry-stretch process and has substantially round shaped pores and a ratio of machine direction tensile strength to transverse direction tensile strength in the range of 0.5 to 5.0. The method of making the foregoing microporous membrane includes the steps of: extruding a polymer into a nonporous precursor, and biaxially stretching the nonporous precursor, the biaxial stretching including a machine direction stretching and a transverse direction stretching, the transverse direction stretching including a simultaneous controlled machine direction relax.

Disclosed are a light-driven filtration antibacterial composite membrane and a preparation method and use thereof. The method for preparing the light-driven filtration antibacterial composite membrane includes: mixing dichloromethane and N,N-dimethylformamide to obtain a first solution; adding PCL particles to the first solution, and stirring until being uniform to obtain an electrospinning solution; adding a ZIF-8 powder to the electrospinning solution, and ultrasonically dispersing for at least 1 hour to obtain a PCL/ZIF-8 spinning solution; spraying the PCL/ZIF-8 spinning solution onto a PPCL@PDA/TAEG men-blown membrane to obtain the light-driven filtration antibacterial composite membrane.