138 results about "Porous microstructure" patented technology

Irrigation and drainage systems are disclosed, including a saturated zone and at least one pipe in communication with the saturated zone. The pipe(s) can be configured to comprise a tubarc porous microstructure for conducting water from the saturated zone to an unsaturated zone in order to drain the water from the saturated zone. The water can be delivered from the saturated zone to the unsaturated zone through the tubarc porous microstructure, thereby permitting the water to be harnessed for irrigation or drainage through the hydrodynamic movement of the water from one zone of saturation or unsaturation to another.

A solid polymer electrolyte membrane having a first surface and a second surface opposite the first surface, where the solid polymer electrolyte membrane has a failure force greater than about 115 grams and comprises a composite membrane consisting essentially of (a) at least one expanded PTFE membrane having a porous microstructure of polymeric fibrils, and (b) at least one ion exchange material impregnated throughout the porous microstructure of the expanded PTFE membrane so as to render an interior volume of the expanded PTFE membrane substantially occlusive; (c) at least one substantially occlusive, electronically insulating first composite layer interposed between the expanded PTFE membrane and the first surface, the first composite layer comprising a plurality of first carbon particles supporting a catalyst comprising platinum and an ion exchange material, wherein a plurality of the first carbon particles has a particle size less than about 75 nm, or less than about 50 nm, or less than about 25 nm.

A composite multilayer implantable material having a first inner tubular layer formed of expanded polytetrafluoroethyene having a porous microstructure defined by nodes interconnected by fibrils, wherein said first layer has a plurality of pleated folds, a second tubular layer formed of textile material circumferentially disposed exteriorly to said first layer; and having an elastomeric bonding agent applied to one of said first layer or second layer and disposed within the pores of said microstructure for securing said first layer to said second layer.

A composite intraluminal prosthesis which is preferably used as a vascular prothesis includes a layer of ePTFE and a layer of textile material which are secured together by an elastomeric bonding agent. The ePTFE layer includes a porous microstructure defined by nodes interconnected by fibrils. The adhesive bonding agent is preferably applied in solution so that the bonding agent enters the pores of the microstructure of the ePTFE. This helps secure the textile layer to the ePTFE layer.

An implant comprising a porous microstructure is disclosed which has an external surface, where at least a region of the external surface is formed of the porous microstructure. The microstructure is defined by at least one lattice of cells. Each cell has a predetermined cell topology and a plurality of edges. One or more of the edges of each cell connect to an adjacent cell along a corresponding edge thereof. Collectively, the cells have a periodic or aperiodic arrangement within the at least one lattice.

A preferred embodiment biosensor is a multi-layer micro-porous thin film structure. Pores in a top layer of the micro-porous thin film structure are sized to accept a first molecule of interest. Pores in a second layer of the micro-porous thin film structure are smaller than the pores in the top layer and are sized to accept a second molecule of interest that is smaller than the first molecule of interest. The pores in the second layer are too small to accept the first molecule of interest. The pores in the top layer and the pores in the second layer are sized and arranged such that light reflected from the multi-layer micro-porous thin film structure produces multiple superimposed interference patterns that can be resolved. In preferred embodiments, the multi-layer micro-porous thin film structure is a porous silicon thin film multi-layer structure formed on a silicon substrate, such as a silicon wafer. Specific and nonspecific binding can be detected with biosensors of the invention. The position of peaks in the Fourier transform of the reflection spectrum and the shift in peak amplitudes can be used to determine the presence and quantity of targeted biological molecules of interest.

A composite intraluminal prosthesis which is preferably used as a vascular prosthesis includes a layer of ePTFE and a layer of textile material which are secured together by an elastomeric bonding agent. The ePTFE layer includes a porous microstructure defined by nodes interconnected by fibrils. The adhesive bonding agent is preferably applied in solution so that the bonding agent enters the pores of the microstructure of the ePTFE. This helps secure the textile layer to the ePTFE layer.

Microstructured optical fiber (MOF) includes a cladding extending a length between first and second ends. The cladding includes an inner porous microstructure that at least partially surrounds a hollow core. A perimeter contour of the hollow core has a non-uniform radial distance from a center axis of the cladding such that first segments of the cladding along the perimeter contour have a shorter radial distance from the center axis relative to second segments of the cladding along the perimeter contour. The cladding receives and propagates light energy through the hollow core, and the inner porous microstructure substantially confines the light energy within the hollow core. The cladding defines at least one port hole that extends radially from an exterior surface of the cladding to the hollow core. Each port hole penetrates the perimeter contour of the hollow core through one of the second segments of the cladding.

The invention discloses a gold-containing catalyst for preparing vinyl chloride by using an acetylene method as well as a preparation method and application of the catalyst. The catalyst contains a gold element, a lanthanum element, a cobalt element, a co-catalytic metal element and a carrier with a porous micro-structure. The gold accounts for 0.3%-2% by mass of the catalyst; the gold element in the catalyst comes from gold chlorides or gold nitrates; the cobalt element comes from chlorides of the cobalt or cobalt nitrates; and the lanthanum element comes from lanthanum chlorides or lanthanum nitrates. The catalyst disclosed by the invention in use is free from inactivation phenomenon caused by sublimation of industrial catalyst mercury chloride, has no pollution to the environment, overcomes defects of high toxicity and high pollution of the conventional industrial catalyst mercury chloride, has the characteristics of simple preparation method, high conversion rate of the acetylene and selectivity of the vinyl chloride, long service life up to 1000 hours or more, high temperature resistance, and high intensity and is renewable, and the conversion rate of the acetylene and selectivity of the vinyl chloride approximate to or exceed the technical indexes of the mercury chloride catalyst.

The invention relates to a method for in-situ synthesis of a SiC nanowires modified carbon/carbon composite preform by a sol-gel method. Since a silica sol-gel system with a porous microstructure is firstly obtained by the sol-gel method, the contact area of the reaction is increased to a greater extent, and the grown nanowires have certain directionality, which is conductive to improving the mechanical properties of materials. The nanowires are immersed in a 2D carbon felt, the obtained silicon source capable of generating SiC nanowires is uniformly dispersed and has low decomposition temperature, the grown nanowires can be stably and uniformly dispersed in the carbon felt, and the efficiency of the densification can be greatly improved. The carbon sources provided by isothermal CVI process deposition natural gas and capable of generating SiC nanowires are reacted with silicon source to generate nanowires and a part of carbon sources are formed into pyrolytic carbon and coated on the surface of nanowires, and the phenomena of the falling, growing and breakage of nanowires occurring in the course of obtaining high-density C/C composite material by the subsequent densification are effectively avoided.

An anode in a Direct Carbon Fuel Cell (DCFC) is provided. The anode includes a cermet anode that can be made of nickel-copper/yttria-stabilized zirconia oxide (Ni—Cu/YSZ) or nickel-copper/gadolina-doped ceria (Ni—Cu/GDC). The surface of the cermet anode is functionalized by decorating it with dispersed catalytic particles. The particles can be made of various materials such as ruthenium (Ru), rhodium (Rh), palladium (Pd), rhenium (Re), osmium, (Os), iridium (Ir), platinum (Pt), gold (Au), or any combination of the particles' alloys and mixtures. Decorating is a process where discrete particles are deposited to the anode surface. In general the particles are not able to contact each other and have a well-defined separation. The cermet anode has a graded porous microstructure spanning from a macropore outer region to a submicron inner region, where the pore span is from tens of microns to hundreds of nanometers.

The invention belongs to the technical field of marine life fouling prevention, and relates to a dimension-adjustable porous micro-structured surface antifouling material prepared from mixed materials of organosilicon acrylic acid copolymer resin, an amine nucleation promoter, and a curing agent according to a certain volume ratio. First, organosilicon acrylic acid copolymer resin, the amine nucleation promoter, and the curing agent are well mixed, and the mixture is used for coating, such that a dimension-adjustable porous micro-structured surface is formed under room temperature. The volumeof the amine nucleation promoter takes 0.5% to 2.0% of the volume of organosilicon acrylic acid copolymer resin, and the volume of the curing agent takes 1%-3% of the volume of organosilicon acrylic acid copolymer resin. A mass ratio of a prepolymer containing double-bond organosilicon to propylene monomers is 2:1-1:2. The content of acrylonitrile monomers takes 0-25% of a total mass of the propylene monomers. The adjusting method is advantaged in simple technology, reliable principle, convenient adjustment, and flexible operation. The material is advantaged in good antifouling effect, and issuitable to be used in equipment fouling preventing occasions in various marine environments.

The invention relates to a preparation method of a nano ferroferric oxide porous heavy metal adsorbing material. A three-dimensional microsphere template is prepared through a SiO2 microsphere, and then is fully impregnated in a Fe3O4 precursor solution, and drying, sintering and soaking are performed to obtain the nano ferroferric oxide porous heavy metal adsorbing material with controllable pore size and specific surface area. The microsphere template is fully impregnated through the precursor solution, the template is removed through heating and solvent soaking while the ferroferric oxide is produced, then a pure ferroferric oxide phase and a porous microstructure are obtained, and the high-specific surface area porous adsorbing material is further obtained; the adsorbing material is strong in adsorbing capacity; the method can control the mespore size to be 2-50 nm, a large pore to be more than 50 nm, and the scope of the specific surface area to be 100-1600 m<2>/g; the porous adsorbing material has a strong adsorbing capacity for the heavy metal ions like Pb, Cr, Cd, As, Ni and Cu, and the preparation method has the advantages of simple operation, controllable structure, low preparation cost and broad market prospect.

The invention belongs to the field of the hydrogel material application and the technical field of novel medical materials and particularly relates to inorganic-organic hybrid three-dimensional interpenetrating network hydrogel materials and a preparation method and an application thereof. The inorganic-organic hybrid three-dimensional interpenetrating network hydrogel materials comprise inorganic material enhanced first supermolecular hydrogel and room temperature in-situ polymerized second polymer hydrogel. Polymer monomers form a second polymer hydrogel network in a first network formed by inorganic materials and dendritic polymers through in-situ polymerization to form the inorganic-organic hybrid three-dimensional interpenetrating network hydrogel and accordingly the mechanical performance of the inorganic-organic hybrid three-dimensional interpenetrating network hydrogel is high. The sol state is transformed into the gel state in the polymerization process due to the in-situ polymerization of the second polymer hydrogel network and accordingly the injection performance of the inorganic-organic hybrid three-dimensional interpenetrating network hydrogel is good. The inorganic-organic hybrid three-dimensional interpenetrating network hydrogel is of a porous microstructure and accordingly the adsorption capability or the load capacity of the inorganic-organic hybrid three-dimensional interpenetrating network hydrogel are high and X-ray developer or small molecule drugs can be loaded.

The invention discloses an air pressure control method and device used for photonic band gap optical fiber drawing, and belongs to the technical field of optical fiber manufacturing. The method includes firstly inserting an intermediate into an intermediate fixing table, sealing the intermediate and the intermediate fixing table with sealing glue, connecting a single-cavity body and a double-cavity body in a threaded manner, with a fiber core duct being inserted into an intermediate fiber core during connection, and after assembling is finished, communicating a fiber-core-cavity gas pipe port, a cladding-cavity gas pipe port and an outer-cavity gas pipe port to a gas chamber of an air pressure control electric part through gas guiding pipes separately to achieve independent air pressure control of three regions which are a fiber core cavity, a cladding cavity and an outer cavity. The method and the device overcome a problem of independent precise air pressure control of the three regions during a photonic band gap optical fiber drawing process. The method and the device have universality and are suitable for porous micro-structured optical fiber drawing requiring independent air pressure control for separated regions. A pressure difference is adopted to determine on-off control time of an electromagnetic valve, thus controlling a gas flux through the pressure difference and increasing air pressure control precision.