379 results about "Silica fiber" patented technology

A flame retardant or flame resistant (FR) fiber blend is provided that comprises amorphous silica fibers and at least one FR fiber. A flame retardant fabric, manufactured from a blend of fibers comprises amorphous silica fibers and at least one FR fiber. Barrier fabrics, manufactured from a blend of fibers, are provided comprising amorphous silica fibers and at least one FR fiber.

The invention provides a preparation method of high elasticity super hydrophobic high temperature silicon dioxide fibrous membrane. The invention is characterized in that the method includes the following steps: template polymer is stirred in solvent at 60 DEG C to obtain template solution with mass concentration of 5-30%; organic silicon or nano silicon dioxide are mixed with water and inorganic acid at normal temperature to obtain silicon source solution; the template solution and the silicon source solution are mixed to be uniform at normal temperature to obtain electro spun solution; the electro spun solution is subject to electrostatic spinning at normal temperature to obtain composite fibrous membrane; the compound fibrous membrane is placed into a muffle furnace to be forged, so as to obtain a nano silicon dioxide fibrous membrane; the nano silicon dioxide fibrous membrane is placed into organic silicon hydrocarbon compound solution to be soaked for 6-30h and then is dried in vacuum, thus obtaining the high elasticity super hydrophobic high temperature nano silicon dioxide fibrous membrane. The material is antifouling and self-cleaning under high temperature high pressure severe environment.

A broadband light amplifier comprising a pair of signal transmission and amplification arms, one for carrying a short wavelength signal in a short optical wavelength band and another for carrying a longer wavelength signal in a longer optical wavelength band, an optical amplifier in each arm for amplifying a respective signal carried therein, and a wavelength division optical multiplexer for combining the amplified signals into a single optical fiber, the amplifier being devoid of a circulator.

Low concentrations of substances dissolved in liquids are detected by coupling analysis / excitation light into the liquid core of an optical waveguide in the form of a capillary. When the substance of interest is to be excited to cause the emission of fluorescent light, the excitation light is transversely coupled into the hollow core of the waveguide and the generated fluorescent light is kept in the optical path of the waveguide for as long as possible. The invention also contemplates the use, in either an absorption or fluorescence mode, of specially treated fused silica fibers to deliver analysis / excitation light with very short wavelengths into the liquid core of an optical waveguide.

Various embodiments described herein comprise a laser and / or an amplifier system including a doped gain fiber having ytterbium ions in a phosphosilicate glass. Various embodiments described herein increase pump absorption to at least about 1000 dB / m-9000 dB / m. The use of these gain fibers provide for increased peak-powers and / or pulse energies. The various embodiments of the doped gain fiber having ytterbium ions in a phosphosilicate glass exhibit reduced photo-darkening levels compared to photo-darkening levels obtainable with equivalent doping levels of an ytterbium doped silica fiber.

An apparatus and method for transmission of laser pulses with high output beam quality using large core step-index silica optical fibers having thick cladding, are described. The thick cladding suppresses diffusion of modal power to higher order modes at the core-cladding interface, thereby enabling higher beam quality, M2, than are observed for large core, thin cladding optical fibers. For a given NA and core size, the thicker the cladding, the better the output beam quality. Mode coupling coefficients, D, has been found to scale approximately as the inverse square of the cladding dimension and the inverse square root of the wavelength. Output from a 2 m long silica optical fiber having a 100 μm core and a 660 μm cladding was found to be close to single mode, with an M2=1.6. Another thick cladding fiber (400 μm core and 720 μm clad) was used to transmit 1064 nm pulses of nanosecond duration with high beam quality to form gas sparks at the focused output (focused intensity of >100 GW / cm2), wherein the energy in the core was <6 mJ, and the duration of the laser pulses was about 6 ns. Extending the pulse duration provided the ability to increase the delivered pulse energy (>20 mJ delivered for 50 ns pulses) without damaging the silica fiber.

A cardiac pacemaker or other CRT device has one or more fine wire leads to the heart. Formed of a glass, silica, sapphire or crystalline quartz fiber with a metal coating, a unipolar lead can have an outer diameter as small as about 300 microns or even smaller. The metal buffer coating may be deposited directly on the glass / silica fiber, or upon an intermediate layer between the glass / silica fiber and metal, consisting of carbon and / or polymer. The resulting metallized glass / silica fibers are extremely durable, can be bent through small radii and will not fatigue even from millions of iterations of flexing. Bipolar fine wire leads can include several insulated metallized glass / silica fibers residing side by side, or can be coaxial with two or more insulated metal conductive paths. An outer protective sheath of a flexible polymer material can be included. The fine wire lead incorporates a thin metal conductor, which poses unique challenges for attachment to standardized connectors, as well as stimulation electrodes. The present invention describes means and materials for creating robust and durable electrically conductive connections between the fine wire lead body and a proximal standardized connector and distal ring and tip electrodes.

A layered composition which can be used in various processes has been developed. The composition comprises an inner core such as a cordierite core and an outer layer comprising a refractory inorganic oxide, a fibrous component and an inorganic binder. The refractory inorganic oxide layer can be alumina, zirconia, titania, etc. while the fibrous component can be titania fibers, silica fibers, carbon fibers, etc. The inorganic oxide binder can be alumina, silica, zirconia, etc. The layer can also contain catalytic metals such as gold and platinum plus other modifiers. The layered composition is prepared by coating the inner core with a slurry comprising the refractory inorganic oxide, fibrous component, an inorganic binder precursor and an organic binding agent such as polyvinyl alcohol. The composition can be used in various hydrocarbon conversion processes.

The invention discloses a preparation method of a porous network structure fiber membrane of nano cellulose / silicon dioxide. The preparation method is characterized by comprising the following concrete steps: coating prepared cellulose nanocrystal of which the diameter is 3-10nm on the surface of an inorganic silicon dioxide nano-fiber membrane to form a network structure after modifying the cellulose nanocrystal by a surfactant, thereby the mechanical property, the filtering property and the like of the inorganic silicon dioxide fiber membrane are improved due to strong hydrogen-bond action of the cellulose. The finally obtained filter membrane has the advantages of being simple in structure, good in mechanical strength, good in filtering effect, low in cost and the like, and the preparation method has wide application prospect in the fields such as air filtering, catalysis, organisms, pharmacy, drinking water purification, textile-dyeing wastewater treatment, and PVA (polyvinyl alcohol) size recovery.

A device comprising a fiber grating loop ringdown (FGLRD) system of analysis is disclosed. A fiber Bragg grating (FBG) or Long-Period grating (LPG) written in a section of single mode fused silica fiber is incorporated into a fiber loop. By utilizing the wing areas of the gratings' bandwidth as a wavelength dependent attenuator of the light transmission, a fiber grating loop ringdown concept is formed. One aspect of the present invention is temperature sensing, which has been demonstrated using the disclosed device. Temperature measurements in the areas of accuracy, stability, high temperature, and dynamic range are also described.

A cardiac pacemaker, other CRT device or neurostimulator has one or more fine wire leads. Formed of a glass, silica, sapphire or crystalline quartz fiber with a metal buffer cladding, a unipolar lead can have an outer diameter as small as about 300 microns or even smaller. The buffered fibers are extremely durable, can be bent through small radii and will not fatigue even from millions of iterations of flexing. Bipolar leads can include several conductors side by side within a glass / silica fiber, or can be concentric metal coatings in a structure including several fiber layers. An outer protective sheath of a flexible polymer material can be included.

The invention relates to a preparation method of a flexible silicon dioxide fiber film. The method includes: (1) mixing tetraethyl orthosilicate, ultrapure water and phosphoric acid at room temperature to obtain a transparent and clear silicon source solution; (2) dissolving polyvinyl alcohol in the ultrapure water with stirring at the temperature of 80-90 DEG C for 4-5 hours to obtain a polyvinyl alcohol solution; (3) mixing the silicon source solution with the polyvinyl alcohol solution to obtain a colorless clear spinning solution, standing and ageing prior to electrostatic spinning, and collecting a layer of uniform white fiber film; (4) putting the white fiber film in a muffle furnace, heating to 500 DEG C prior to retaining the temperature for 2-4 hours, then heating to 800 DEG C prior to retaining the temperature for 2-3 hours, and finally naturally cooling to obtain the flexible silicon dioxide fiber film. The preparation method is simple, and the prepared silicon dioxide fiber film is resistant to organic solvents and corrosion, has good flexibility after being subjected to high temperature and has potential application in the fields of catalyst loading and fluorescent films.

The invention discloses fiber concrete comprising the following components in parts by weight: 170-180 parts of water, 335-345 parts of cement, 60-70 parts of coal ash, 13-19 parts of silicon ash, 1755-1775 parts of aggregates, 2.8-3.5 parts of basalt fiber, 3-5 parts of polycarboxylate superplasticizer and 30-34 parts of light silica fiber anti-crack reinforcer. Basalt fiber is not only good in stability, but also has various excellent performances such as electric insulation property, corrosion resistance, combustion resistance, high temperature resistance and the like. Due to the doping of the light silica fiber anti-crack reinforcer, the separation tendency of the concrete can be effectively avoided and inhibited, and cracks generated after the concrete is poured can be remarkably reduced and even completely eliminated, so that the concrete has the advantages of high compactness, high strength, good durability, low bleeding rate, high anti-crack coefficient and the like. Due to the doping of the coal ash, the silicon ash and the polycarboxylate superplasticizer, the performance of the concrete is improved, the generation of cracks is controlled effectively, and the positive significance for the durability of the concrete is taken.

A laminar flow, wet electrostatic precipitator (ESP) with planar collecting electrodes preferably made of membranes, such as a woven silica fiber. The collecting electrodes are spaced close to planar discharge electrodes to promote laminar flow (Re<2300). Charging electrodes are positioned upstream of the wet ESP to charge the particulate entering the wet ESP to promote collection. The wet ESP is preferably downstream from a conventional turbulent dry ESP for collecting a substantial portion of the larger particulate in the gas stream prior to the gas stream entering the wet ESP.

The invention provides a modified silicon dioxide powder / silicon dioxide nanofiber cross-gradient composite aerogel material and a preparation method thereof. The modified silicon dioxide powder / silicon dioxide nano fiber cross-gradient composite aerogel material is characterized in that silicon dioxide nano fibers serve as a three-dimensional framework structure of aerogel, modified nano silicondioxide powder is uniformly filled in gaps formed among single nano fibers, the whole composite material is divided into three layers of different nano silicon dioxide powder filling densities in thickness, and by the three-dimensional framework formed by the silicon dioxide nanofibers, good compression resilience and strength are achieved. The three-dimensional silicon dioxide powder / silicon dioxide nanofiber aerogel material has a bulk density of 10-1000 mg / cm<3> and the average pore size of 0.05-1000 mu m, a tensile strength of 20-50 kPa, and a compression resilience is greater than or equal to 85%. According to the inner structure of the obtained aerogel material, silicon dioxide powder is uniformly dispersed in meshes of a three-dimensional frame formed by silicon dioxide fibers, thefibers are mutually staggered and penetrated to form pores, the mechanical strength of the aerogel material is improved, meanwhile, the aerogel material has a high porosity and small pore size structure, and has wide application prospects in the fields of heat insulation, sound absorption, noise reduction and the like.

The invention discloses a preparation method of a hydrophobic silica fiber film and a use of the hydrophobic silica fiber film in removal of organic pollutants. The preparation method solves the problem that the existing silica fiber film adsorbs hydrophobic organic pollutants in water difficultly. The preparation method comprises the following steps of preparing silanes with hydrophobic groups and one or more solvents into a silane solution, and immersing a silica nanofiber film in the silane solution for modification so that a hydrophobic group-modified silica nanofiber film is obtained. The hydrophobic groups on surfaces of the silica nanofibers can bind with matrix silica by chemical bonds and thus the hydrophobic silica fiber film has strong adhesion, can be separated and recovered, can be prepared under mild conditions, and can be used as an adsorbent for adsorbing hydrophobic organic pollutants in a water source.

The present invention relates to meso visual ordered hybridized silicon dioxide fiber, and is especially sol-gel process of continuously spinning meso visual ordered hybridized silicon dioxide fiber with high strength and great specific surface area and the process of compounding derivative with optical, electric and magnetic characteristic and catalytic activity. The present invention combines solvent evaporating, surfactant self-organization inducing and silica sol-gel process, continuous spinning process to prepare hybridized silicon dioxide fiber, and high temperature sintering or solvent extracting to eliminate surfactant and to obtain meso visual ordered hybridized silicon dioxide fiber. Via controlling the molecular structure and concentration of surfactant, the continuous regulation of meso visual structure and size may be realized. The fiber of the present invention has excellent mass transferring performance as well as high strength and high size stability.

An IR laser source providing light in the IR spectrum, the laser source comprising a pump laser operating at a frequency equivalent to wavelength shorter than 2 μm and at a predetermined power, and an optic fiber coupled to the pump laser. The optic fiber has at least a section of a hollow core photonic crystal fiber, the at least a section of hollow core photonic crystal fiber being designed to have at least a passband in the IR spectrum and being filled with a molecular gas for triggering at least one Stoke's shift in the light entering the at least a section of hollow core photonic crystal fiber for the particular power of the pump laser, the at least one Stoke's shift be selected to cause the light entering the at least a section of hollow core photonic crystal fiber to shift in frequency into the passband in the IR spectrum of the hollow core photonic crystal fiber.

A dual-layered thermal insulation composite panel includes an out layer of high-temperature resistant carbon fiber reinforced phenolic resin composite and an inner layer of low thermal conductivity and high-purity silica fiber reinforced phenolic resin composite. A hot press or autoclave may be used to pressurize said materials into shaping. The dual-layered thermal insulation composite panel achieves excellent performance in thermal resistance, thermal insulation and mechanical strength.

A layered composition which can be used in various processes has been developed. The composition comprises an inner core such as a cordierite core and an outer layer comprising a refractory inorganic oxide, a fibrous component and an inorganic binder. The refractory inorganic oxide layer can be alumina, zirconia, titania, etc. while the fibrous component can be titania fibers, silica fibers, carbon fibers, etc. The inorganic oxide binder can be alumina, silica, zirconia, etc. The layer can also contain catalytic metals such as gold and platinum plus other modifiers. The layered composition is prepared by coating the inner core with a slurry comprising the refractory inorganic oxide, fibrous component, an inorganic binder precursor and an organic binding agent such as polyvinyl alcohol. The composition can be used in various hydrocarbon conversion processes including production of vinyl acetate.

The present invention provides nanometer-sized diameter silica fibers that exhibit high diameter uniformity and surface smoothness. The silica fibers can have diameters in a range of a about 20 nm to about 1000 nm. An exemplary method according to one embodiment of the invention for generating such fibers utilizes a two-step process in which in an initial step a micrometer sized diameter silica preform fiber is generated, and in a second step, the silica preform is drawn while coupled to a support element to form a nanometer sized diameter silica fiber. The portion of the support element to which the preform is coupled is maintained at a temperature suitable for drawing the nansized fiber, and is preferably controlled to exhibit a temporally stable temperature profile.

A compact single frequency, single-mode 1 μm fiber laser with narrow linewidth (<10 kHz) and high output power (>2 mW) is formed with an oxide-based multi-component glass fiber doped with triply ionized rare-earth ytterbium ions and fiber gratings formed in sections of passive silica fiber and fused thereto. The multi-component glass supports higher doping concentrations than standard silica fiber, hence higher output power levels in short cavities. Formation of the gratings in passive silica fiber both facilitates splicing to other optical components and reduces noise thus improving linewidth.

The invention discloses a device for preparing near-field optical probes and a method therefor. The device comprises damping rubber, a support soleplate, a three-phase brushless motor, an adjusting bracket and an optical microscope, wherein the support soleplate is horizontally arranged on the damping rubber; and the three-phase brushless motor, the adjusting bracket and the optical microscope are fixed on the support soleplate. The method comprises the following steps: firstly, fixing a silica fiber on the adjusting bracket and above an abrasive substance in a set angle; and when the abrasive substance is rotated, making the fiber approach the abrasive substance and generate friction, rotating the fiber in different angles along the axial direction of the fiber, repeatedly approaching and rubbing a grinding sheet, and preparing the near-field optical probes with different shapes such as triangular pyramid, rectangular pyramid, circular cone and the like by grinding. The method overcomes the limitation of preparing the taper angle of a fiber optic probe, can directly set a grinding taper angle, and has flexible manufacturing mode, safe and environment-friendly manufacturing process, short preparation time, accurate control of parameters, good repeatability; and the whole device has simple and convenient operation and low preparation cost.

A layered composition which can be used in various processes has been developed. The composition comprises an inner core such as a cordierite core and an outer layer comprising a refractory inorganic oxide, a fibrous component and an inorganic binder. The refractory inorganic oxide layer can be alumina, zirconia, titania, etc. while the fibrous component can be titania fibers, silica fibers, carbon fibers, etc. The inorganic oxide binder can be alumina, silica, zirconia, etc. The layer can also contain catalytic metals such as gold and platinum plus other modifiers. The layered composition is prepared by coating the inner core with a slurry comprising the refractory inorganic oxide, fibrous component, an inorganic binder precursor and an organic binding agent such as polyvinyl alcohol. The composition can be used in various hydrocarbon conversion processes.

A cardiac pacemaker, other CRT device or neurostimulator has one or more fine wire leads. Formed of a glass, silica, sapphire or crystalline quartz fiber with a metal buffer cladding, a unipolar lead can have an outer diameter as small as about 300 microns or even smaller. The buffered fibers are extremely durable, can be bent through small radii and will not fatigue even from millions of iterations of flexing. Bipolar leads can include several conductors side by side within a glass / silica fiber, or can be concentric metal coatings in a structure including several fiber layers. An outer protective sheath of a flexible polymer material can be included.

Thin conductive metal coatings suitable for flexible nonmetal fine wires and leads are described. Polymer clad silica fiber cores are produced by plasma coating with dual layers of metals such as silver, gold or titanium to provide micro thin leads such as those used for pacemakers that are resistant to flexing breakage, and are conductive. The metal surfaces can be engineered to promote cell adhesion so that tissue scarring in vivo is greatly reduced. Nanostructure and thickness of the metal coating can be controlled to provide radiopaque surfaces on nonmetal medical devices and lead wires.

A flame and heat resistant paper is disclosed having high burnthrough prevention capability, as required in aircraft applications. The paper is prepared from modified aluminum oxide silica fibers, in addition to other components, and has exceptional tensile strength and flexibility as compared to conventional inorganic papers.