69 results about "Size selectivity" patented technology

Membranes for filtration by size exclusion are formed from open-ended nanotubes embedded in a polymeric matrix. The matrix forms a layer whose thickness is substantially less than the average length of the nanotubes, allowing the nanotubes to be randomly oriented throughout the matrix while providing channels extending through the layer for the selective passage of molecular species or particles based on size.

Size-selective hemocompatible porous polymeric adsorbents are provided with a pore structure capable of excluding molecules larger than 50,000 Daltons, but with a pore system that allows good ingress and egress of molecules smaller than 35,000 Daltons. The pore system in these porous polymeric adsorbents is controlled by the method of synthesis so that 98% of the total pore volume is located in pores smaller than 300 Angstroms (Å) in diameter with a working pore size range within 100 to 300 Å in diameter. The porous polymeric adsorbents of this invention are very selective for extracting midsize proteins, such as cytokines and β₂-microglobulin, from blood and other physiologic fluids while keeping the components required for good health such as cells, platelets, albumin, hemoglobin, fibrinogen, and other serum proteins intact.

The invention discloses a preparation method of a layered molybdenum sulfide nanosheet molecule separating membrane. According to the preparation method, n-butyllithium is taken as an intercalation modular and enters a molybdenum sulfide crystal lattice after long-time stirring; water is added for decomposing n-butyllithium, so that the interlayer distances of a molybdenum sulfide sheet are enlarged; molybdenum sulfide is dispersed into monoatomic layer materials through ultrasonic treatment; redundant impurities are removed through dialysis, and a purified and clean molybdenum sulfide water solution is obtained; the obtained molybdenum sulfide water solution is treated with a vacuum filtration method, and the layered molybdenum sulfide nanosheet molecule separating membrane is obtained; and the thickness of the membrane is adjusted by adjusting the volume of the used molybdenum sulfide water solution. A molecule-selective separation membrane is obtained with a method of stacking the monoatomic layer materials to form the membrane; and the material preparation method is simple, the cost is low, and the obtained membrane has size selective separation performance on different molecules.

The invention provides a preparation method for a mesoporous compound film. The method comprises the following steps: triggering the alcoholysis reaction of a precursor compound and a structure-directing agent in ethyl alcohol, thereby obtaining a sol; performing surface treatment on a porous film and soaking in the sol; airing the soaked porous film under a room temperature condition and completing a sol-gelling process; cleaning and drying, thereby obtaining the mesoporous compound film. According to the invention, a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, cetyl trimethyl ammonium bromide or lauryl sodium sulfate is taken as the structure-directing agent, so that the mesoporous size of the prepared mesoporous compound film can be continuously adjusted. The mesoporous compound film prepared according to the invention has a unique mesoporous structure; due to the organic solvent resistance and special porous structure or the capability of further modifying the mesoporous of the compound film, the mesoporous compound film can be applied to the separating purification fields of selective molecule transferring in the solution, the size selective ion transferring and ultrafiltration on a separating and liquid/liquid interface, and the like; the preparation process is simple; the method is environment-friendly.

Monodisperse nanoparticles are prepared with a high degree of reproducibility by controlling pH in size-selective photoetching. The nanoparticles have uniform optical properties and other properties.

A size-selective hemocompatible porous polymeric adsorbent system is provided, the polymer system comprises at least one polymer with a plurality of pores, and the polymer has at least one transport pore with a diameter from about 250 Angstroms to about 2000 Angstroms, and the polymer has a transport pore volume greater than about 1.8% to about 78% of a capacity pore of volume of the polymer.

Intermittent energy sources, including solar and wind, require scalable, low-cost, multi-hour energy storage solutions to be effectively incorporated into the grid. Redox-flow batteries offer a solution, but suffer from rapid capacity fade and low Coulombic efficiency due to the high permeability of redox-active species across the battery's membrane. Here we show that active-species crossover can be arrested by scaling the membrane's pore size to molecular dimensions and in turn increasing the size of the active material to be above the membrane's pore-size exclusion limit. When oligomeric redox-active organic molecules were paired with microporous polymer membranes, the rate of active-material crossover was either completely blocked or slowed more than 9,000-fold compared to traditional separators at minimal cost to ionic conductivity. In the case of the latter, this corresponds to an absolute rate of ROM crossover of less than 3 μmol cm⁻² day⁻¹ (for a 1.0 M concentration gradient), which exceeds performance targets recently set forth by the battery industry. This strategy was generalizable to both high and low-potential ROMs in a variety of electrolytes, highlighting the importance of macromolecular design in implementing next-generation redox-flow batteries.

The invention relates to a metal organic framework material based on lead nitrate and application thereof. The technical scheme is that metal salt Pb(NO3)2, ligand H4BPTC and a solvent N,N-dimethylacetamide are placed in a container, ultrasonic oscillation is performed until the metal salt and the ligand are evenly scattered into the solvent; the solvent is sealed and then placed in an oven to stand for 72 h at 85 DEG C, white cube blocky crystal is obtained, washed, filtered and dried, and a target product is obtained. A method for preparing the metal organic framework material is simple, the metal organic framework material is stable in structure and has a good three-dimensional pore structure, the silicon cyanation can be catalyzed efficiently, reaction substrate aromatic aldehyde has size selectivity, and the catalytic reaction is performed on the anhydrous and oxygen-free conditions.

A size-selective hemocompatible porous polymeric adsorbent system is provided, the polymer system comprises at least one crosslinking agent and at least one dispersing agent, and the polymer has a plurality of pores with diameters in the range from about 17 to about 40,000 Angstroms

The present application provides apparatuses and methods for the size-selective fractionation of ligand-capped nanoparticles that utilizes the tunable thermophysical properties of gas-expanded liquids. The nanoparticle size separation processes are based on the controlled reduction of the solvent strength of an organic phase nanoparticle dispersion through increases in concentration of the antisolvent gas, such as CO₂, via pressurization. The method of nanomaterial separation contains preparing a vessel having a solvent and dispersed nanoparticles, pressurizing the chamber with a gaseous antisolvent, and causing a first amount of the nanoparticles to precipitate, transporting the solution to a second vessel, pressurizing the second vessel with the gaseous antisolvent and causing further nanoparticles to separate from the solution.

A plug-in connector arrangement includes a terminal block containing a chamber in which are mounted a horizontal bus bar having a transverse wall, and a resilient contact having a fixed horizontal leg portion, an intermediate portion bent upwardly from the first leg portion, and an outwardly biased second leg portion reversely bent back above the first leg portion. The second leg portion contains a clamping end portion that extends through a conductor opening contained in the first leg portion. The clamping portion includes at least two discrete clamping surfaces so arranged that when a bare conductor is inserted into the conductor opening, the conductor circumferential surface is selectively engaged by one or more of the clamping surfaces in accordance with the diametrical size of the conductor. The conductor is biased by the clamping portion toward electrical engagement with the bus bar transverse wall.

The invention provides a redox flow battery comprising a microporous or nanoporous size-exclusion membrane, wherein one cell of the battery contains a redox-active polymer dissolved in the non-aqueous solvent or a redox-active colloidal particle dispersed in the non-aqueous solvent. The redox flow battery provides enhanced ionic conductivity across the electrolyte separator and reduced redox-active species crossover, thereby improving the performance and enabling widespread utilization. Redox active poly(vinylbenzyl ethylviologen) (RAPs) and redox active colloidal particles (RACs) were prepared and were found to be highly effective redox species. Controlled potential bulk electrolysis indicates that 94-99% of the nominal charge on different RAPs is accessible and the electrolysis products are stable upon cycling. The high concentration attainable (>2.0 M) for RAPs in common non-aqueous battery solvents, their electrochemical and chemical reversibility, and their hindered transport across porous separators make them attractive materials for non-aqueous redox flow batteries based on size-selectivity.

The invention discloses a synthesis method and size selective catalytic application of a hollow porous polymer nanosphere composite material encapsulated by noble metal nanoparticles. Firstly, a porous polymer nanosphere network material with a hollow structure is synthesized by a reversible addition-fracture chain transfer polymerization and friedel-crafts overcrosslinking one-pot reaction. Then,the material is used as a main carrier, various guest noble metal nanoparticles are encapsulated respectively into hollow cavities through an impregnation-reduction method, and the final hollow porous polymer nanosphere composite material encapsulated by the noble metal nanoparticles is formed. The synthesis method and size selective catalytic application of the hollow porous polymer nanosphere composite material encapsulated by the noble metal nanoparticles further focus on taking the hollow porous polymer nanosphere composite material encapsulated by palladium metal nanoparticles as a heterogeneous catalyst, and solvent polarity-induced catalytic hydrogenation application with adjustable size selectivity is provided.