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49 results about "Rhombohedron" patented technology
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In geometry, a rhombohedron is a three-dimensional figure like a cube, except that its faces are not squares but rhombi. It is a special case of a parallelepiped where all edges are the same length. It can be used to define the rhombohedral lattice system, a honeycomb with rhombohedral cells.
Multilayer thin film
InactiveUS6258459B1High crystallinityIncrease the buffer functionSemiconductor/solid-state device detailsSolid-state devicesCrystallinityMaterials science
The first object of the invention is to provide means that enables a perovskite oxide thin film having (100) orientation, (001) orientation or (111) orientation to be easily obtained, and the second object of the invention is to provide a multilayer thin film comprising a unidirectionally oriented metal thin film of good crystallinity. The multilayer thin film according to the first embodiment of the invention comprises a buffer layer and a perovskite oxide thin film present thereon. The interface between the buffer layer and the perovskite oxide thin film is made up of a {111} facet plane. Substantially parallel to the facet plane there is present a {110} face of a cubic, rhombohedral, tetragonal or orthorhombic crystal of the perovskite oxide thin film, a {101} face of the tetragonal or orthorhombic crystal or a {011} face of the orthorhombic crystal. The multilayer thin film according to the second embodiment of the invention comprises a metal thin film that is a cubic (100) unidirectionally oriented epitaxial film, and a buffer layer where a {111} facet plane is present on the interface of the buffer layer in contact with the metal thin film.
Owner:SNAPTRACK
Doped pnictogen chalcogenide nanoplates, methods of making, and assemblies and films thereof
ActiveUS20120111385A1Easy to optimizeReduce surface oxidationMaterial nanotechnologyThermoelectric device with peltier/seeback effectMicrowaveSulfur
Embodiments of the invention are directed to doped pnictogen chalcogenide nanoplates, where each nanoplate comprises a rhombohedral crystal of Bi2Te3, Bi2Se3, or Sb2Te3 that is sulfur doped. Another embodiment of the invention is directed to a microwave activated method of preparation of the doped pnictogen chalcogenide nanoplates. Other embodiments of the invention are directed to bulk assemblies or fused films of the doped pnictogen chalcogenide nanoplates and their preparation from the doped pnictogen chalcogenide nanoplates such that the bulk assembly or fused film can be employed in a thermoelectric device.
Owner:SAVITR ENERGY INC +1
Thermographic recording material with improved image tone and/or stability upon thermal development
InactiveUS6096486AImprove wear resistanceAvoid local deformationX-ray/infra-red processesOrganic compound preparationOrganic solventDiffractometer
A recording material comprising a support and a thermosensitive element containing silver behenate, an organic reducing agent therefor in thermal working relationship therewith and a binder, wherein the silver behenate is not associated with mercury and / or lead ions and when the recording material is irradiated with a copper K alpha 1 X-ray source the ratio, normalized to a quantity of silver in the recording material of 1 g per m2 thereof, of the sum of the peak heights of the X-ray diffraction lines attributable to silver behenate at Bragg angles, 2 THETA , of 6.01 DEG , 7.56 DEG , 9.12 DEG , 10.66 DEG , 12.12 DEG and 13.62 DEG to the sum of the peak heights of the X-ray diffraction lines at Bragg angles, 2 THETA , of 25.60 DEG , 35.16 DEG and 43.40 DEG of NIST standard 1976, rhombohedral Al2O3, determined with the same X-ray diffractometer in the same state of adjustment, is greater than 0.85; production processes for particles of substantially light-insensitive organic silver salt comprising silver behenate with these X-ray characteristics in the presence and substantial absence of organic solvent.
Owner:AGFA HEALTHCARE NV
Piezoelectric thin film, piezoelectric element, and manufacturing method thereof
ActiveUS20120319533A1Excellent piezoelectric propertiesGood piezoelectricityPiezoelectric/electrostrictive device manufacture/assemblyPiezoelectric/electrostriction/magnetostriction machinesMixed crystalMaterials science
Provided are a piezoelectric thin film having good piezoelectricity in which a rhombohedral structure and a tetragonal structure are mixed, and a piezoelectric element using the piezoelectric thin film. The piezoelectric thin film includes a perovskite type metal oxide, in which the perovskite type metal oxide is a mixed crystal system of at least a rhombohedral structure and a tetragonal structure, and a ratio between an a-axis lattice parameter and a c-axis lattice parameter of the tetragonal structure satisfies 1.15≦c / a≦1.30. The piezoelectric element includes on a substrate: the above-mentioned piezoelectric thin film; and a pair of electrodes provided in contact with the piezoelectric thin film.
Owner:CANON KK +1
Graphene-loaded rhombohedron ferric oxide composite material and hydrothermal synthesis method thereof
ActiveCN103078108AImprove apparent conductivityImprove electrical performanceCell electrodesOxide compositeGraphene flake
The invention relates to a graphene-loaded rhombohedron ferric oxide composite material and a hydrothermal synthesis method thereof. The composite material is characterized in that a single layer of graphene is used as a matrix skeleton, and rhombohedron ferric oxide uniformly grows on two surfaces of the graphene piece layer; and the particle sizes of the rhombohedron ferric oxide are 50-150 nm, and each surface is a regular parallelogram. The rhombohedron ferric oxide can realize a good electrical conductivity through the graphene piece layer, and therefore the apparent electrical conductivity of the composite material is increased. The material is prepared through two typical steps: 1, preparing pyrolytic graphene; and 2, hydrothermally synthesizing the graphene-loaded rhombohedron ferric oxide composite material. Thegraphene-loaded rhombohedron ferric oxide composite material prepared by the method has a simple process, high reversible capacity and good cycle performance and is a lithium-ion battery anode material with a research value.
Owner:SHANGHAI UNIV
Piezoelectric film and method for manufacturing the same, piezoelectric film element and method for manufacturing the same, and piezoelectric film device
ActiveUS20130015392A1Little oxygen defectExcellent piezoelectric propertiesPiezoelectric/electrostrictive device manufacture/assemblyPiezoelectric/electrostriction/magnetostriction machinesPerovskite (structure)Thin membrane
There is provided a piezoelectric film having an alkali niobate-based perovskite structure expressed by a general formula (NaxKyLiz)NbO3(0≦x≦1, 0≦y≦1, 0≦z≦0.2, x+y+z=1), wherein the alkali niobate has a crystal structure of a pseudo-cubic crystal, a tetragonal crystal, an orthorhombic crystal, a monoclinic crystal, a rhombohedral crystal, or has a crystal structure of coexistence of them, and when total of K—O bonding and K-Metal bonding is set as 100% in a binding state around K-atom of the alkali niobate, a K—O bonding ratio is 46.5% or more and a K-Metal bonding ratio is 53.5% or less, wherein the Metal indicates a metal atom included in the piezoelectric film.
Owner:SUMITOMO CHEM CO LTD
Method for producing petal shaped nano-magnesia by using rhomb spar
The invention discloses a preparation method of petal-shaped nano-magnesium oxide by using dolomite. According to the preparation method, high purity nano-magnesium oxide with a rhombohedron-layer petal-like structure can be achieved by directly using dolomite which takes high-yield mineral as a raw material and by the way of combining the Sec acid leaching method and EDTA-ammonia complexion and precipitation reaction. With low preparing cost and simple process, the invention solves the problem that the mid-outcome nano-magnesium hydroxide is precipitant and is difficult to be filtered. the MgO produced by adopting the invention has the rhombohedron-layer petal-like structure which is in regular arrangement and epitaxial radial growth; and the purity of the produce is more than 99.83 percent; and the ration of the surface area is 114.37 m<2> / g, and 50 percent larger than ordinary Nano-magnesium products; the white degree is more than 97 percent, and is same to that of the high-quality titanium pigment; the purity of the by-product calcium chloride is more than 98.86 percent; and the purity of ammonium nitrate is more than 99.85 percent.
Owner:CENT SOUTH UNIV
Graphite material, carbon material for battery electrodes, and batteries
ActiveUS20130330620A1Impairing good discharge capacityImprove a large current-input/output characteristics and cycle characteristicsGraphiteConductive materialLithiumX-ray
A graphite composite material obtained by mixing graphite material 1 having diversity in the sizes of optical anisotropic structure and optical isotropic structure, the ratio thereof, and crystal direction, and graphite material 2 having a rhombohedron structure, which is different from graphite material 1 and has an average interplanar spacing d002 of plane (002) of 0.3354 nm to 0.3370 nm measured by the powder X-ray diffraction method and Lc of 100 nm or more. Also disclosed is a carbon material for a battery electrode, a paste for an electrode, an electrode, a battery, a lithium ion secondary battery and a method of producing the graphite composite material.
Owner:RESONAC CORP
Composite system LTCC material, and preparation method thereof
The invention belongs to the field of electronic ceramic material and manufacturing of electronic ceramic material, and more specifically relates to a composite system LTCC material, and a preparation method thereof. The general chemical formula of the composite system LTCC material is Li<2x>(Zn<0.96>Co<0.05>)<2-x>SiO<4-y>LMZBS (0.125<=x<=0.375, and y ranges from 1 to 2wt%); the principal crystalline phase is (Zn,Co)<2>SiO<4> with a rhombohedron structure; the secondary crystalline phase is Li<1.6>Zn<1.2>SiO<4> with an orthorhombic system structure; the composite system LTCC material is prepared via low temperature sintering at 900 to 950 DEG C; the dielectric constant epsilon<r> ranges from 6.1 to 6.5; the Q*f value is higher than 130000GHz, and the highest Q*f value is 230602GHz; the temperature coefficient of resonance frequency tau<f> ranges from -41 to -22ppm / DEG C. The raw materials are cheap; the preparation method is simple; operation is convenient; production cost is low; and the composite system LTCC material is capable of reducing the loss of microwave devices or modules as a LTCC microwave medium or device.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Double Sided Sl(GE)/Sapphire/lll-Nitride Hybrid Structure
One aspect of the present invention is a double sided hybrid crystal structure including a trigonal Sapphire wafer containing a (0001) C-plane and having front and rear sides. The Sapphire wafer is substantially transparent to light in the visible and infrared spectra, and also provides insulation with respect to electromagnetic radio frequency noise. A layer of crystalline Si material having a cubic diamond structure aligned with the cubic <111> direction on the (0001) C-plane and strained as rhombohedron to thereby enable continuous integration of a selected (SiGe) device onto the rear side of the Sapphire wafer. The double sided hybrid crystal structure further includes an integrated III-Nitride crystalline layer on the front side of the Sapphire wafer that enables continuous integration of a selected III-Nitride device on the front side of the Sapphire wafer.
Owner:NASA
Obstructive piston type particle damper
ActiveCN106917840AIncrease contact forceIncrease collisionShock absorbersFriction dampersVibration attenuationEngineering
The invention relates to an obstructive piston type particle damper. According to the technical scheme, the lower portion of a guide rod (8) is fixedly connected with a screw hole in the closed end of a damper shell (3) through a thread, and the lower end of the guide rod (8) is fixedly connected with a base through a thread. The upper end of a piston rod (1) penetrate a cover plate (6) and a damper cover (2) to be connected with an external mechanical vibrating system, and the upper portion of the guide rod (8) is movably sleeved with the lower portion of the piston rod (1). A cavity below the cover plate (6) is filled with particle damping materials (7). The piston rod (1) is a whole formed by a rod body and a rotary body, and the rotary body is a sphere or a spheroid or a rhombohedron. A round hole is formed in the lower end face of the piston rod (1) inwards along the axis, and the diameter of the round hole and the guide rod (8) are in clearance fit. The obstructive piston type particle damper is simple and reliable in structure, convenient to manufacture, low in cost, stable in damping effect and wide in application range, can generate large damping and adjust the magnitude of the damping, is suitable for vibration attenuation of periodic vibrating equipment, and is also suitable for vibration attenuation of impact vibrating equipment.
Owner:WUHAN UNIV OF SCI & TECH
Cutting method for free-space photoisolator chip body
ActiveCN102962900AIncreased longitudinal travelReduce cutting timeFine working devicesEngineeringUtilization rate
The invention discloses a cutting method for a free-space photoisolator chip body. The free-space photoisolator chip body comprises a first plane as a light emitting surface of light and a second plane perpendicular to the first plane. The cutting method is characterized in that the cutting method comprises the following steps : A, cutting the chip body in the direction parallel to the second plane by using a blade and cutting the chip body into a plurality of chip strips; B, turning various chip strips into 90 degrees or 270 degrees by using long sides of the chip strips as axes; C, rotating each blade or each chip strip around the axis perpendicular to the second plane at an angle of 6 to 10 degrees; and D, cutting the chip strips in the direction perpendicular to the second plane by using the blade to form a plurality of rhombohedrons. According to the cutting method disclosed by the invention, the utilization rate of a photoisolator chip material can be effectively increased while the chip with low reflection of the photoisolator is obtained.
Owner:SOURCE PHOTONICS CHENGDU
Recording material with improved shelf-line producing prints upon thermal development with improved archivability
InactiveUS6127102AExtended shelf lifeAvoid mixingX-ray/infra-red processesPhotothermographic systemsStearic acidStearate
A recording material comprising a support and a thermosensitive element containing silver stearate, an organic reducing agent therefor in thermal working relationship therewith and a binder, wherein the silver stearate is not associated with mercury and / or lead ions and when the recording material is irradiated with a copper K alpha 1 X-ray source the ratio of the sum of the peak heights of the X-ray diffraction lines attributable to silver stearate at Bragg angles, 2 THETA , of 2 THETA , of 3.62 DEG , 5.45 DEG , 7.30 DEG , 9.04 DEG , 10.97 DEG and 12.71 DEG to the sum of the peak heights of the X-ray diffraction lines at Bragg angles, 2 THETA , of 25.60 DEG , 35.16 DEG and 43.40 DEG of NIST standard 1976, rhombohedral Al2O3, determined with the same X-ray diffractometer in the same state of adjustment on a sample of the recording material and a sample of the NIST standard 1976 cut to fit a sample holder of the X-ray diffractometer, divided by the square root of the quantity of silver in the recording material, expressed in g per m2, is greater than 2.2 m / g0.5; and a process for producing particles of substantially light-insensitive organic silver salt comprising silver stearate with these X-ray characteristics in the substantial absence of organic solvent.
Owner:AGFA HEALTHCARE NV
Near-infrared luminescence bio-fluorescence labeling material and preparation method
InactiveCN103045250AStrong near-infrared luminescenceGood chemical stabilityLuminescent compositionsBiocompatibility TestingManganese
The invention discloses a near-infrared luminescence bio-fluorescence labeling material. The crystal structure of the material is a rhombohedron structure and the molecular formula is Ba3[P(1-x)MnxO4]2, wherein 0.002 <= x <= 0.025. The invention also discloses a preparation method of the material, comprising the steps of: (1) weighing the compound raw materials containing barium, phosphorus, and manganese according to a molar ratio of elements; (2) preburning for 3-8 hours at the temperature of 300-500 DEG C after grinding and mixing; and (3) taking out the sample after preburning, regrounding and mixing, and firing for 10-20 hours at a temperature of 900-1100 DEG C to obtain a near-infrared luminescence fluorescent powder. The bio-fluorescence labeling material of the invention has the advantages of strong luminescence, good chemical stability, excellent water resistance, broad excitation, narrow emission peak, long life and good biocompatibility.
Owner:SOUTH CHINA UNIV OF TECH
Improved electric car structure
InactiveCN104972927AImprove securityFaster and strongerVehicular energy storageElectric propulsionShear stressVehicle frame
The invention provides an improved electric car structure. The improved electric car structure comprises a car frame on the front portion of a car body. A transverse supporting board is fixed to the lateral portion of the car frame of the front portion of the car body. A charging socket is embedded in the middle of the supporting board. An energy storage device is arranged on the car frame on the front lateral portion of the car body and electrically connected with electric equipment and the charging socket through lines. In addition, a car frame range extender damping device is improved; the charging socket of the improved structure is arranged in a forecabin; the layout of a charging circuit is optimized; the circuit is shortened; hidden dangers of high temperature ignition are eliminated; the cost is reduced; installation locations are reasonable due to the wide space; the charging socket is fixed more firmly due to the fixing mode. Meanwhile, the damping device is in a damper shape with the rhombohedron section, in this way, the shear stress principle is well utilized, vibration in a single direction can be dispersed to be in different directions, and the damping effect is greatly improved. By the adoption of the structure, the improved electric car structure is simple in process and low in cost compared with a traditional structure.
Owner:SANMING UNIV
Graphite material, carbon material for battery electrodes, and batteries
ActiveUS9099742B2Impairing good discharge capacityImprove a large current-input/output characteristics and cycle characteristicsGraphiteConductive materialLithiumElectrical battery
Owner:RESONAC CORPORATION
Preparation and application of lithium-rich laminar metal oxide as negative electrode material of lithium ion cell
InactiveCN102502822AHigh crystallinityHigh purityCell electrodesVanadium compoundsHigh densityMaterial synthesis
The invention relates to a novel lithium-rich material with a laminar rhombohedron structure, which is used as a negative electrode material of a lithium ion secondary cell, and a preparation method and application thereof, belonging to the technical fields of material synthesis and high-energy lithium ion cells. The general formula of the lithium-rich material is Li1+xVO2 (0.01<x<0.50). The lithium-rich material is characterized in that a discharge platform (about 0.1V) which is high in specific capacity and lower and relatively stable is brought by a high-density material, lithium ions are easily intercalated into or deintercalated from a laminar main material by virtue of excessive lithium in a crystal structure, and the safety performance of laminar intercalation into and deintercalation from the main body is improved. The product obtained by solid-phase sintering has high crystallinity and purity and narrow micro-scale particle size distribution. Chemical testing shows that the lithium-rich material prepared by the method has the maximal first discharge capacity of 406.8 mAh / g, and can be used as a lithium-intercalated negative electrode material to be applied to lithium ion cells. The method is simple in process, environmentally friendly, easy to industrialize and broad in application prospect, and meets practical production.
Owner:GUANGZHOU HKUST FOK YING TUNG RES INST
Method for forming a layer of single-phase oxide (fe, cr)2o3 with a rhombohedral structure on a steel or super alloy substrate
PendingUS20210010125A1Solar heating energySolid state diffusion coatingPhysical chemistryAlloy substrate
The invention relates to a method for forming a layer of single-phase oxide (30) (Fe, Cr)2O3 with a rhombohedral structure on a steel or super alloy substrate (10), comprising the following successive steps:a) supplying a steel or super alloy substrate (10) covered with a surface layer, the steel comprising at least 2 wt.-% chromium;b) removing the surface layer in an atomsphere containing at least 0.2 atm dioxygen, creating a level of micro-deformation in the crystal lattice of the steel or super alloy that is greater than 1.0.10−3, and a heating at a heating rate higher than 400° C. / s, such as to form a layer of rhombohedral oxide (30) (Fe, Cr)2O3,c) carrying out a thermal treatment, in the presence of air, at a water partial pressure of less than 10.000 ppm, and at a temperature varying between 400° C. and 1000° C., such as to grow the layer of rhombohedral oxide formed in step (b) to a thickness from 70 nm to 150 nm.
Owner:SALZGITTER MANNESMANN PRECISION ETIRAGE
Hydrogen absorbing alloy and secondary battery
InactiveUS20070190417A1Reduce the amount of solutionImprove stabilityHydrogenElectrode manufacturing processesElectrical batteryCondensed matter physics
Owner:GS YUASA INT LTD
Preparation method of rhombohedral alpha type ferric oxide
The invention discloses a preparation method of rhombohedral alpha type ferric oxide. The preparation method comprises the following steps of S1, preparing a water-soluble ferric salt water solution;S2, adding a phosphine organic matter into the water-soluble ferric salt water solution, and obtaining a reaction mixture; S3, carrying out microwave hydrothermal reaction on the reaction mixture for0.5h to 2.0h at 180 DEG C to 220 DEG C, and obtaining a solid-liquid mixture; S4, carrying out solid-liquid separation on the solid-liquid mixture, and cleaning and drying a solid to obtain the rhombohedral alpha type ferric oxide. According to the preparation method of the rhombohedral alpha type ferric oxide provided by the invention, the water-soluble ferric salt is adopted as a raw material, the phosphine organic matter is then added, a lone pair electron carried by a phosphorus atom is utilized to be selectively adsorbed on the particle surface, and the growth rate of the particle surfaceespecially a special (104) crystal face in a specific growth direction is slowed down, so that the specific crystal face is finally exposed on the surface. According to the preparation method of therhombohedral alpha type ferric oxide provided by the invention, the reaction efficiency is high, the preparation process is simple, and the preparation cost is effectively reduced; meanwhile, the obtained product is high in purity, high in yield, uniform in particle size and stable in performance.
Owner:QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
Double sided Si(Ge)/Sapphire/III-nitride hybrid structure
ActiveUS9449818B2Solid-state devicesSemiconductor/solid-state device manufacturingSapphire waferCrystalline silicon
One aspect of the present invention is a double sided hybrid crystal structure including a trigonal Sapphire wafer containing a (0001) C-plane and having front and rear sides. The Sapphire wafer is substantially transparent to light in the visible and infrared spectra, and also provides insulation with respect to electromagnetic radio frequency noise. A layer of crystalline Si material having a cubic diamond structure aligned with the cubic <111> direction on the (0001) C-plane and strained as rhombohedron to thereby enable continuous integration of a selected (SiGe) device onto the rear side of the Sapphire wafer. The double sided hybrid crystal structure further includes an integrated III-Nitride crystalline layer on the front side of the Sapphire wafer that enables continuous integration of a selected III-Nitride device on the front side of the Sapphire wafer.
Owner:NASA
Recording material with improved image tone and or stability upon thermal development
InactiveUS6114100AExtended shelf lifeAvoid mixingX-ray/infra-red processesPhotothermographic systemsOrganic solventDiffractometer
A recording material comprising a support and a thermosensitive element comprising silver palmitate, an organic reducing agent therefor in thermal working relationship therewith and a binder, wherein the silver palmitate is not associated with mercury and / or lead ions and when the recording material is irradiated with a copper K alpha 1 X-ray source the ratio of the sum of the peak heights of the X-ray diffraction lines attributable to silver palmitate at Bragg angles, 2 THETA , of 4.01 DEG , 6.049 DEG , 8.031 DEG , 10.06 DEG , 12.08 DEG and 14.09 DEG to the sum of the peak heights of the X-ray diffraction lines at Bragg angles, 2 THETA , of 25.60 DEG , 35.16 DEG and 43.40 DEG of NIST standard 1976, rhombohedral Al2O3, determined with the same X-ray diffractometer in the same state of adjustment on a sample of the recording material and a sample of the NIST standard 1976 cut to fit a sample holder of the X-ray diffractometer, divided by the square root of the quantity of silver in the recording material, expressed in g per m2, is greater than 3.09 m / g0.5; and a process for producing particles of substantially light-insensitive organic silver salt comprising silver palmitate with these X-ray characteristics in the substantial absence of organic solvent.
Owner:AGFA HEALTHCARE NV
Method for preparing long-rhombohedron and short-column rhombohedron anhydrous magnesium carbonate mixture
ActiveCN110217808AConsistent shapeUniform sizeMagnesium carbonatesReaction temperatureDistilled water
The invention provides a method for preparing a long-rhombohedron and short-column rhombohedron anhydrous magnesium carbonate mixture. The method is characterized by employing the following steps: adding MgCl2.6H2O and CH4N2O into distilled water according to a certain mass-mole ratio, so as to prepare a clear solution of a certain concentration; heating up the solution, and carrying out a pre-synthesis reaction for 1 to 2 hours at a reaction temperature of 80 DEG C to 95 DEG C; slowly adding NaOH into a pre-synthesis reacted mixed solution, and adjusting a pH value of the mixed solution to be11; transferring the mixed solution into a Teflon-lined stainless-steel reactor, and carrying out a hydrothermal reaction for 4 to 6 hours at a temperature of 140 DEG C to 150 DEG C; and subjecting aproduct to negative-pressure filtering, washing and baking after the hydrothermal reaction is completed, thereby obtaining anhydrous magnesium carbonate, wherein the anhydrous magnesium carbonate isformed through mixing two kinds of crystals of different morphologies, one kind of crystals are long rhombohedra, the other kind of crystals are short column rhombohedra, and both kinds belong to a trigonal crystal system, the long-rhombohedron anhydrous magnesium carbonate crystals have the diameter of 10 to 20 microns and the length of 25 to 50 microns, and the short-column-rhombohedron anhydrous magnesium carbonate crystals have the diameter of 15 to 20 microns and the length of 20 to 25 microns.
Owner:SHANDONG UNIV OF TECH
A rhombohedron capable of scaling
ActiveCN110304275BAchieve improvementInterfering collisions do not occurCosmonautic vehiclesCosmonautic partsAviationMechanical engineering
Owner:BEIJING JIAOTONG UNIV
A kind of preparation method of rhombohedral and short rhombohedral anhydrous magnesium carbonate mixture
ActiveCN110217808BConsistent shapeUniform sizeMagnesium carbonatesCrystal systemReaction temperature
The invention provides a method for preparing a mixture of rhombohedral and rhombohedral anhydrous magnesium carbonate, which belongs to the technical field of new inorganic chemical materials, and is characterized in that the following steps are adopted: MgCl 2 ·6H 2 Add O into distilled water to prepare a transparent solution with a certain concentration, and add CH at a certain molar ratio 4 N 2 O, stir to obtain a mixed solution; heat the mixed solution to carry out a pre-synthesis reaction, the reaction temperature is 80-95°C, and the reaction time is 1-2h; NaOH is slowly added to the mixed solution of the pre-synthesis reaction, and the pH value of the mixed solution is adjusted to 11 ; The mixed solution is moved to a stainless steel reaction kettle with polytetrafluoroethylene lining for hydrothermal reaction, the temperature of the hydrothermal reaction is 140-150°C, and the reaction time is 4-6h; after the hydrothermal reaction is completed, the product is negatively Press filtration and washing to obtain anhydrous magnesium carbonate; anhydrous magnesium carbonate is composed of two crystals with different shapes; one of them is rhombohedral and the other is short columnar rhombohedral, both of which belong to the trigonal crystal system The rhombohedral anhydrous magnesium carbonate crystal has a diameter of 10-20 μm and a length of 25-50 μm; the rhombohedral anhydrous magnesium carbonate crystal has a diameter of 15-20 μm and a length of 20-25 μm.
Owner:SHANDONG UNIV OF TECH
Carbon-coated titanium potassium phosphate nanoparticles and its preparation method and application
ActiveCN106887579BShort electronic conductivityImprove electronic conductivityMaterial nanotechnologyCell electrodesCarbon layerHigh rate
The invention relates to a carbon-cladded KTi2(PO4)3 nano particle and a preparation method. The material can be used as a sodium ion battery anode active material, with the size of 100 to 200 nanometers; carbon uniformly covers the surface of a KTi2(PO4)3 nano particle, thus forming a carbon layer; the KTi2(PO4)3 nano particle is KTi2(PO4)3 of a rhombohedron phase; the carbon layer is 1 to 10 nanometers in thickness. The carbon-cladded KTi2(PO4)3 nano particle has the beneficial effects that the potassium titanyl phosphate nano particle with a shorter sodium ion diffusion path is obtained, and the electronic conductivity of the material is improved. The obtained carbon-cladded KTi2(PO4)3 nano particle is relatively high in sodium ion diffusion rate and relatively high in electronic conductivity; when being used as the sodium ion battery anode active material, the carbon-cladded KTi2(PO4)3 nano particle provides excellent rate capability, cycling performance at high rate and relatively high specific capacity, and is a high-rate and long-service-life application material to a sodium ion battery.
Owner:安徽国芯新材料股份有限公司
Functionally graded carbides
A functionally graded carbide body (400) can include a group 5 metal carbide substrate having a bulk composition region (410) that contains at least 70 wt% of a rhombohedral [zeta]-phase carbide. A [gamma]-phase-rich region (420) having a [gamma]-phase-rich composition can be at a surface (430) of the substrate, and a phase composition gradient region (440) can transition from the [gamma]-phase-rich composition region at the surface to the bulk composition region at a gradient depth (450) below the surface.
Owner:UNIV OF UTAH RES FOUND
Nano material, synthesis method thereof, gas sensor and preparation method and application of gas sensor
PendingCN111638251AReduce power consumptionExcellent gas sensitivityMaterial resistanceSodium acetatePyrrolidinones
The invention is applicable to the technical field of sensors and provides a nano material, a synthesis method thereof, a gas sensor, a preparation method and applications of the gas sensor. The synthesis method of the nano material comprises the following steps: dissolving ferric nitrate, polyvinylpyrrolidone and sodium acetate in a mixed solvent, and carrying out a hydrothermal reaction at a temperature of 160-220 DEG C to obtain a reactant; carrying out suction filtration separation on the reactant to obtain a solid; and washing and drying the solid, and calcining the solid at the temperature of 450-500 DEG C to obtain a nano material with the rhombohedral structure. A gas sensor for detecting the concentration of ethanol gas can be prepared by depositing the nano material between sensing electrodes of a sensor chip. The gas sensor based on the nano material has the advantages of lower power consumption, ultrafast response / recovery characteristic to low-concentration ethanol gas, good selectivity and stability to the ethanol gas and the like.
Owner:苏州新傲信息技术有限公司
structure
The technical problem to be solved by the present invention is to provide a structure that includes yttrium oxyfluoride and can improve plasma resistance. Specifically, it is to provide the following structure: polycrystals of yttrium oxyfluoride having a rhombohedral crystal structure as the main component, and the average crystal size in the polycrystals are less than 100 nm, characterized in that, by X-ray Diffraction The peak intensity of the rhombohedral crystal detected near the diffraction angle 2θ=13.8° is r1, the peak intensity of the rhombohedral crystal detected near the diffraction angle 2θ=36.1° is r2, and the ratio γ1 is γ1(%)=r2 When / r1×100, the ratio γ1 is 0% or more and less than 100%.
Owner:TOTO LTD
Spandex plain cloth fabric for centralizing light in luminescent layer
The invention relates to a spandex plain cloth fabric for centralizing light in a luminescent layer. The spandex plain cloth fabric for centralizing the light in the luminescent layer comprises a spandex plain cloth body (1), a waterproof layer (2) is arranged on the spandex plain cloth body, an antibacterial layer (3) is arranged on the upper surface of the waterproof layer, the lower surface of the spandex plain cloth body is provided with a radiation protection layer (4), and the lower surface of the radiation protection layer is provided with a formfitting layer (6). The back surface of the formfitting layer is provided with a lining fabric layer, the lining fabric layer comprises the luminescent layer, the upper part of the luminescent layer is provided with a light collecting layer, a plurality of convex rhombohedrons are arranged on the light collecting layer, the luminescent layer is a fabric blended with a luminescent fiber, and the rhombohedron is a prism. The spandex plain cloth fabric for centralizing the light in the luminescent layer has stereoscopic impression, and has the multiple functions of antisepsis, radiation protection, waterproofness and the like. The spandex plain cloth fabric centralizes the light in the luminescent layer.
Owner:JIANGSU HAIPENG SPECIAL VEHICLES
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