205results about How to "Excellent thermal" patented technology

An optical illuminator using Vertical Cavity Surface Emitting Laser (VCSEL) is disclosed. Optical modules configured using single VCSEL and VCSEL arrays bonded to a thermal submount to conduct heat away from the VCSEL array, are suited for high power and high speed operation. High speed optical modules are configured using single VCSEL or VCSEL arrays connected to a high speed electronic module on a common thermal submount or on a common Printed Circuit Board (PCB) platform including transmission lines. The electronic module provides low inductance current drive and control functions to operate the VCSEL and VCSEL array. VCSEL apertures are designed for a desired beam shape. Additional beam shaping elements are provided for VCSELs or VCSEL arrays, for desired output beam shapes and/or emission patterns. VCSEL arrays may be operated in continuous wave (CW) or pulse operation modes in a programmable fashion using a built-in or an external controller.

A molecular sieve containing composition, which can be applied in catalytic cracking reaction for producing more ethylene and propylene, and its preparation method. The composition contains a pentasil-type molecular sieve having a SiO2/Al2O3 molar ratio of 15-60, prepared by activation and modification with phosphorus, alkaline earth metal and transition metal. The composition essentially includes 85 DIFFERENCE 98% wt of pentasil-type molecular sieve, 1 DIFFERENCE 10% wt of P2O5, 0.3 DIFFERENCE 5% wt of alkaline earth oxide, and 0.3 DIFFERENCE 5% wt of transition metal oxide. The molecular sieve structure and active centers have high thermal and hydrothermal stability. The salient feature of this composition is that when applied as an active component of cracking catalyst for catalytic pyrolysis process, the yield of ethylene is above 18% and the total yield of ethylene and propylene is more than 40%.

A nanofiber, which is prepared by using a fabrication method comprising the steps of spinning a spinning solution prepared by dissolving at least one precursor for metal, metal oxide, or metal complex oxide with a polymer mixture comprising at least two polymers having different molecular weights and glass transition temperatures in a solvent and thermally treating the spun fiber, comprises close-packed nanoparticles of a metal, a metal oxide, a metal complex oxide or a mixture thereof and has excellent structural, thermal, and mechanical stability as well as a uniform fiber-shape.

The invention provides Ce:YAG microcrystalline glass capable of achieving yellow luminescence under the condition of blue light excitation and a preparation method of the Ce:YAG microcrystalline glass, and Ce:YAG fluorescence microcrystals are inlaid uniformly in an oxide glass matrix of the microcrystalline glass. The microcrystalline glass comprises glass components in percentage by mole as follows: 0-10 mol% of SiO2, 0-40 mol% of GeO2, 20-60 mol% of TeO2, 0-25 mol% of B2O3, 0-15 mol% of P2O5, 0-10 mol% of Al2O3, 0-20 mol% of Ae2O, 0-20 mol% of ZnO, 0-15 mol% of BaO, 0-20 mol% of Sb2O3, 0-20 mol% of La2O3 and 0-10 mol% of Bi2O3, wherein Ae is selected from Li, Na or K; and the content of Ce:YAG microcrystals is 1-15 wt% of the oxide glass matrix. The invention further provides a preparation method for the microcrystalline glass. The microcrystalline glass provided by the invention can emit yellow light under the excitation of blue light, the yellow light and the blue light are combined to generate intense white light, and accordingly, the microcrystalline glass and the method can be used for development and application of construction of the white light LED which is excited by a blue light chip.

The invention relates to high-thermal conductivity lubricating oil and a preparation method thereof. The lubricating oil contains base oil and fluorinated graphene nanosheets, wherein the weight percent of content of the fluorinated graphene nanosheets is 0.01 to 10.0 %; and the preparation method comprises the steps as follows: firstly, preparing the fluorinated graphene nanosheets; and secondly, preparing the lubricating oil containing the fluorinated graphene nanosheets. The lubricating oil provided by the invention has the advantages of excellent antifriction effect, extremely high heat conduction capability and excellent stability and dispersibility.

The present invention provides an improvement in the process of producing energy from fuel cells. A cyclic reforming process, referred to as temperature swing reforming, provides an efficient means for producing a hydrogen containing synthesis gas for use in proton conducting solid oxide fuel cell applications. In one embodiment, at least some synthesis gas which is first produced in the temperature swing reforming process is combusted with air to provide the heat for the regeneration step of the temperature swing reforming process. The syngas produced in TSR is particularly well suited for use in proton conducting solid oxide fuel cell applications.

The invention discloses a plant oil-based polyurethane composite material and a preparation method thereof and belongs to the technical field of high polymer materials. The synthesized composite material comprises the following components: plant oil-based polyhydric alcohols, an organic tin catalyst, polyisocyanates and a short chain extender, wherein the modified nano reinforced material is polysilsesquioxane. According to the polyurethane composite material disclosed by the invention, the reproducible epoxidized plant oil serves as an initial raw material, and a modification effect is achieved by physically dispersing the polysilsesquioxane in a polyurethane matrix. The plant oil-based polyurethane composite material has the advantages that the initial raw material is green and environment-friendly, and multiple problems such as energy crisis and environmental pollution can be relieved; physical modification is performed by adopting the polysilsesquioxane with a regular structure, and the method is easy and convenient to implement; and moreover, the modified material has the advantages of high mechanical strength and high heat stability, and the application range of the materials can be further widened.

The present invention provides methods for making improved zeolite and crystalline silicoaluminophosphate (SAPO) membranes, in particular SAPO-34 membranes, on a porous support through improved removal of the organic structure-directing templating agent. A calcining step is performed in an oxygen free atmosphere, such as under a vacuum or inert gas, to remove the organic templating agent. By removing the templating agent in the absence of oxygen, the calcination step can remove a greater amount of the templating agent than comparable template removal steps conducted in the presence of oxygen and the calcination step can be conducted at significantly lower temperatures. The membranes of the present invention provide increased permeance while maintaining comparable selectivity for gas separations, particularly carbon dioxide (CO₂) and methane (CH₄) separations and separations at high temperatures.

The invention discloses a preparation method of innoxious negative ion aqueous polyurethane, and aqueous polyurethane prepared by the method. The method comprises the following steps: mixing dicyclohexyl methane diisocyanate and aliphatic diol according to a mol ratio of 2.5 to 4; carrying out reaction for 3 to 5 hours at 70 to 90 DEG C to obtain performed polymers; adding dimethylolbutyric acid with hydrophilic groups for taking the reaction for 3 to 5 hours; adding KOH water solution for emulsifying dispersion; and dripping diamine chain extenders for extending chains to obtain aqueous polyurethane latex emulsion. The invention adopts the aliphatic diisocyanate dicyclohexyl methane diisocyanate resin and the aliphatic polymeric diol, does not contain organic solvents such as NMP, acetone and the like often used for preparing the aqueous polyurethane, and does not contain common use neutralizing agents such as triethylamine and the like. The completely innoxious polyurethane material can be prepared, and the invention can be widely used in the fields of medical and health, food and household articles.

A continuous method to make a prepreg with improved thermal conductivity and electrical properties for use in multilayer printed circuit boards.

The invention belongs to the technical field of carbon material manufacturing technology, and in particular relates to a method for preparing graphene by using lignin as a raw material. The method is as follows: a layered or powdered material is used as a substrate, the lignin and a catalyst precursor are alternately assembled on the surface of the substrate by a layer-by-layer electrostatic self-assembly method, then a lignin / catalyst precursor / substrate composite is put into a double-temperature-zone tubular furnace, a H2 / Ar mixed gas is introduced into the double-temperature-zone tubular furnace at a certain speed, at the same time the double-temperature-zone tubular furnace is heated by a certain procedure, after the double-temperature-zone tubular furnace is heated to target temperature, the temperature of the double-temperature-zone tubular furnace is held for a certain time, when the double-temperature-zone tubular furnace is cooled to room temperature, the sample is taken out, and is soaked in an acid for catalyst removal, and after a plurality of times of washing and vacuum drying, the graphene is obtained. The method has the advantages of simple process and convenient operation, and the prepared graphene is good in growth, controllable in layer number and considerable in yield.

The present invention relates to an electrochemical biosensor for detecting hydrogen peroxide, a preparation method and an application thereof. The preparation method comprises the steps of (1) synthesizing the silica-three-dimensional graphene composite material; (2) doping nitrogen and carbon into the synthesized silica-three-dimensional graphene composite material; (3) pretreating a glassy carbon electrode; (4) preparing the glassy carbon electrode modified by the nitrogen-carbon-doped silica-three-dimensional graphene composite material through the dispensing method; (5) putting the glassy carbon electrode into a chloroauric acid solution to prepare gold nanoparticle-nitrogen-carbon-doped silica-three-dimensional graphene glassy carbon electrode through chronoamperometry; (6) dipping the glassy carbon electrode into a double-sulfhydryl-modified GDNA solution and cultivating for 2-4 hours; (7) dipping the composite electrode into a hemin solution for 10-14 hours. The electrochemical biosensor is good in stability and reproducibility, high in specificity and sensitivity, fast and simple and convenient to operate. The electrochemical biosensor can be used for detecting the content of hydrogen peroxide in biological samples, cosmetics and the like.

The invention relates to a carbon nanometer tube field emitting cathode and a manufacturing method thereof. The carbon nanometer tube field emitting cathode comprises a conductive substrate, a grapheme layer and a carbon nanometer tube layer, wherein the grapheme layer and the carbon nanometer tube layer are sequentially stacked on the conductive substrate. The theory ratio surface area of grapheme reaches up to 2600m<2>/g, the unique two-dimensional structure of the carbon nanometer tube field emitting cathode can conduct effective electric heat transmission, more excellent thermotics and electrics performance is obtained compared with a carbon nanometer tube, the grapheme layer is arranged between the conductive substrate and the carbon nanometer tube layer, the characteristics of the large grapheme ratio surface area and excellent conductive heat dissipation are brought into full play, adhesive force of the carbon nanometer tube layer can be improved, and an emission current and stability are improved.

The invention provides a slurry composition suitable for the manufacture of Si.sub.3 N.sub.4 sintered bodies, wherein the dispersion properties and oxidation resistance of Si powder in water are improved, resulting in the homogenous dispersion of a sintering aid powder and a fine Si powder with less oxygen. Si powder, a sintering aid, water in an amount of 50 to 90 wt % relative to the total weight of the composition, and a surface coating agent in an amount of 0.05 to 10 wt % relative to the Si powder are added, the pH is adjusted to between 3 and 8, and the ingredients are milled and mixed. Trivalent metal ions such as Fe or Ga, or a polysiloxane with a BHL of no more than 10 is used as the surface coating agent. The resulting slurry composition can be used to prepare Si.sub.3 N.sub.4 sintered bodies with better electrical, thermal, and mechanical properties.

The invention discloses an Er<3+>/Yb<3+> co-doped yttrium lithium fluoride monocrystal and a preparation method thereof. The yttrium lithium fluoride monocrystal is a rare earth ion Er<3+>/Yb<3+> co-doped monocrystal; the molecular formula is LiY(1-x-y)ErxYbyF4, wherein x is greater than or equal to 0.008 and less than or equal to 0.085, and y is greater than or equal to 0.002 and less than or equal to 0.170; the segregation coefficients of Yb<3+> and Er<3+> in the yttrium lithium fluoride are about 1, and efficient intermediate infrared laser of 2.7 microns can be output; and the yttrium lithium fluoride monocrystal has high transmittance of intermediate infrared laser, has better thermal, mechanical and chemical stabilities than those of glass state materials and has the characteristics of low phonon energy, high optical transmittance of wavebands with width of 300-5500nm, less color center forming amount, low thermal lens effect and the like, thereby being more easily processed and more suitably used in laser devices. In the preparation method disclosed by the invention, a sealing crucible falling technology is used, so that the operation is simple; the raw material is fluorated at high temperature in a sealed water-free and oxygen-free environment, so that the crystal is isolated from air and water vapor during the growth; and therefore, the high-quality Er<3+>/Yb<3+> co-doped LiYF4 monocrystal containing little OH<-> ion and oxide is obtained.

The invention discloses a nanometer photo-catalyst used in producing hydrogen by decomposing water under visible light response and application of the nanometer photo-catalyst. The catalyst is a nanocomposite which is formed by taking a one-dimensional organic semiconductor nanofiber as a framework, coating the surface of the framework with an inorganic semiconductor titanium dioxide nanolayer and uniformly loading platinum nanoparticles, wherein the organic semiconductor nanofiber is prepared by self-assembling super molecules of perylene diimide and cycle-expanding derivatives, naphthalene diimide derivatives or hexabenzobenzene diimide derivatives with the photochemical stability, D-A structures and visible light response, then titanium dioxide is directly loaded in situ in a body phase organic solution and platinum is reduced and deposited through ultraviolet light in a photo-catalysis aqueous solution system. The catalyst is novel in structure, low in cost and available; the preparation process of the catalyst is simple, environmentally-friendly, low in energy consumption and suitable for preparation in scales; the catalyst is capable of decomposing water in the visible light to prepare the hydrogen, has the actual and wide application prospects in preparation of the hydrogen through decomposing the water in solar light and provides a novel idea and an important reference for forming an efficient photo-catalyst responding to the visible light.

The invention discloses a carbonitride nano two-dimensional material enhanced structural ceramic and a preparation method thereof. The preparation method comprises the following steps: S1, weighing carbonitride nano two-dimensional material powder and structural ceramic powder in a preset proportion; S2, uniformly mixing the carbonitride nano two-dimensional material powder with the structural ceramic powder; and S3, sintering the power uniformly mixed in the S2 to obtain the carbonitride nano two-dimensional material enhanced structural ceramic. The carbonitride nano two-dimensional materialenhanced structural ceramic and the preparations method thereof are simple and rapid and green and environment-friendly. The research range of a novel structure-function integrated ceramic and ceramic-based composite material is expanded.

A compound is represented by Formula (1):

wherein, each X is independently oxygen, sulfur, or selenium; m is 0 or 1; each n is independently 0 or 1; R¹-R³ are each independently, for example, hydrogen or alkyl having 1 to 20 carbons;

wherein

• (i) in the case of m=0, it is excluded that all of R¹-R³ are hydrogen at the same time;
• (ii) in the case of m=0, n=0 and in the case that m is 0, one of n is 0 and the other is 1, it is excluded that “both of X are sulfur and all R³s are the same atoms or groups at the same time”;
• (iii) in the case of m=0, n=1, it is excluded that all R³s are the same atoms or groups at the same time, and at least one of R³s is hydrogen.