3results about How to "Large aspect ratio" patented technology

This invention discloses a gas diffusion layer with multi-level mass transfer channels, its preparation method, and its application. The gas diffusion layer with multi-level mass transfer channels includes a substrate layer and a microporous layer on the substrate layer; wherein the microporous layer comprises carbon black, hollow porous carbon nanofibers, and optionally a hydrophobic binder. This invention uses hollow porous carbon nanofibers as a novel MPL carbon material to synergistically construct a gas diffusion layer with better water vapor management capabilities in conjunction with carbon black particles. The resulting gas diffusion layer exhibits excellent comprehensive performance; its hollow porous structure provides additional water transport channels, improving water vapor transport capacity, thereby enabling the assembled membrane electrode to have better output performance.

This invention provides a multi-turn silver nanoring and its preparation method, belonging to the field of metal nanomaterial preparation technology. The invention first mixes a polyvinylpyrrolidone (PVP) glycol solution with pyridine to obtain a mixed solution; then, the mixed solution, a sodium halide glycol solution, silver nitrate, and sodium nitrate are mixed, followed by a solvothermal reaction and precipitation separation to obtain multi-turn silver nanorings. The method for preparing multi-turn silver nanorings is simple, easy to implement, has good reproducibility, and high yield. During the preparation process, the addition of the organic solvent pyridine enables the silver nanowires to bend and grow significantly to form multi-turn silver nanorings.

This invention relates to the field of polymer materials and discloses a modified polypropylene material and its application in HPPM double-wall corrugated pipes. The modified polypropylene material comprises: polypropylene resin, modified graphitic carbon nitride, modified multi-walled carbon nanotubes, and additives. The modified graphitic carbon nitride is prepared by grafting a hindered amine-type bromine-substituted intermediate with amino-modified graphitic carbon nitride. The hindered amine-type bromine-substituted intermediate is prepared by reacting ethyl 2-amino-4-methylthiazolium-5-carboxylate with 1,4-dibromobutane and then undergoing transesterification with 2,2,6,6-tetramethyl-4-piperidinol. The modified multi-walled carbon nanotubes are prepared by grafting acyl chloride multi-walled carbon nanotubes with a cyclotriphosphazene derivative. The cyclotriphosphazene derivative is prepared by reacting 4-imidazolium formaldehyde with p-phenylenediamine, then undergoing substitution with hexachlorocyclotriphosphazene and further addition with DOPO. The modified polypropylene material prepared by this invention possesses good mechanical properties, UV aging resistance, flame retardancy, and antibacterial properties.