A method of manufacturing a separator element for obtaining molecular and/or particulate separation by tangential flow of a fluid medium for treatment into a filtrate and a retentate, the element having a structure (2) of at least two porous rigid columns (3) made of the same material, positioned side by side to define, outside their outside walls, a volume (4) for recovering the filtrate, each column (3) presenting, internally, at least one open structure (5) for passing a flow of the fluid medium, opening out in one of the ends of the porous column for inlet of the fluid medium for treatment, and in the other end for outlet of the retentate. The element is a single-piece rigid structure (2) made as a single piece that is uniform and continuous throughout, without any bonds or exogenous additions.

A filtration filter comprises a porous film including a central film portion having a plurality of through holes and an outer edge portion adjacent to the central film portion. The porous film portion lies in a flat plane in the absence of a force being applied to the central portion of the central film portion. A frame holds the outer edge portion of the porous film in such a manner that when a force is applied to the central film portion in a first direction, the central film portion moves in the first direction relative to the flat plane and the outer edge portion moves in a second direction, opposite to the first direction, relative to the flat plane. In this way stresses applied to the porous film during a filtering operation are reduced.

A filter device provides for designs that permit variable levels of solid particle and water molecule removal. The filter device retains the particles and the water molecules in the filter medium when removed, thus avoiding the re-entry of the particles and water molecules when the power system has cooled down as is now likely in conventional filters currently in use. Further, the filter device traps the water molecules already present in the fluid being filtered (i.e., “native water”), as well as any moisture resulting from condensation that may be introduced into the lubrication system whenever it is opened.

Embodiments relate to systems and methods for forming an air filtration system. The system includes an air filter. The air filter includes a plurality of filtration surfaces, including a first outer filtration surface, a second outer filtration surface opposite to the first outer filtration surface, and one or more inner filtration surfaces provided between the first and second outer filtration surfaces. The plurality of filtration surfaces may be configured to trap one or more airborne particulates, including viruses and/or bacteria. The air filtration assembly further includes a disinfectant coating. The disinfectant coating is formed on at least a portion of the plurality of filtration surfaces. The disinfectant coating may be for use in disinfecting trapped airborne particulates. The disinfectant coating includes a performance layer. The performance layer includes metal ions. The disinfectant coating further includes an enhancement layer. The enhancement layer includes carbonates.

In one aspect, a material structure is disclosed, which includes a macroscopic porous substrate configured to receive a flow of a medium for passage of at least a portion thereof through the porous substrate. At least one porous coating is disposed on at least a portion of an inner surface of the porous substrate, wherein the porous coating comprises a matrix having a plurality of interconnected passages. The porous substrate and the coating are configured to treat at least one contaminant, if any, present in the flowing medium.

A co-assembly method for synthesizing inverse photonic structures is described. The method includes combining an onium compound with a sol-gel precursor to form metal oxide (MO) nanocrystals, where each MO nanocrystal has crystalline and amorphous content. The MO nanocrystals are combined with templating particles to form a suspension. A solvent is evaporated from the suspension to form an intermediate or compound product, which then undergoes calcination to produce an inverse structure.

A specially functionalized composite filter material with a high specific surface area is used to adsorb PFAs from potable water. In a preferred embodiment, the base filter material is granular activated carbon (GAC), which is sequentially coated with a thin layer of polydopamine, a thin layer of partially oxidized iron, and a thin coating of octadecylamine. After PFAs are adsorbed onto the coated GAC particles, the PFAs are removed by a rinsing process, and remain in the rinse effluent. GAC particles are recovered and recoated as needed to restore their adsorptive capacity. The PFA-containing effluent is treated using photochemical processes to destroy the PFA molecules. The now PFA-free effluent can be disposed of as a non-hazardous material. The composite filter material works in systems ranging from small passive systems for personal use to large scale, high-flow-rate utility water treatment systems.

There is described a method of using a feedstock gas reactor. Reaction of feedstock and combustion gases in the reactor produces hydrogen through pyrolysis of the feedstock gas. At least some of a mixed product stream extracted from the reactor may be recycled to the reactor to drive further pyrolysis of the feedstock gas. A portion of the recycled mixed product stream may be recirculated back to a combustion chamber of the reactor, and a portion of the recycled mixed product stream may be recirculated back to a reaction chamber of the reactor.

Filter assemblies are described. In particular, filter assemblies that include a filter frame, a fire resistant filter media, and a metallic layer disposed on and covering a major surface of the filter frame are described. The filter frame is rigid and includes at least one of a polymeric material, wood, or a wood pulp material. Filter assemblies described include flammable or meltable materials yet may retain structural integrity after being exposed to flame.

A filtration filter that filters a liquid containing a filtration target, the filtration filter including a filter base portion defining a plurality of through-holes. The filter base portion includes a plurality of first base portions and a plurality of second base portions that are thinner than the plurality of first base portions. Each of the plurality of second base portions are between the plurality of first base portions.