195results about How to "Low chemical stability" patented technology

An MEMS transducer is constituted of a diaphragm, a plate, a support structure for supporting the diaphragm and the plate with a gap layer surrounded by an interior wall, an electrode film (e.g. a pad conductive film) for covering a contact hole formed in the support structure, and a protective film (e.g. a pad protective film) which is formed on the support structure externally of the interior wall so as to cover the side surface of the electrode film having low chemical stability. The protective film is formed in the limited area including a part of the surface of the electrode film except for its center portion and the surrounding area of the electrode film. This allows the protective film to use materials having high membrane stress such as silicon nitride or silicon nitride oxide.

The invention discloses a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a shell, ionic liquid electrolyte, positive plates, negative plates and diaphragms, wherein the ionic liquid electrolyte, the positive plates, the negative plates and the diaphragms are coated in the shell; the diaphragms are used for dividing the positive plates from the negative plates; each positive plate comprises a positive substrate and a positive coating which is combined on the surface of the positive substrate; the positive coating comprises a LiMPO4-graphene composite, wherein M is at least one of Fe, Co, Mn, Ni and V; each negative plate comprises a negative substrate and a negative coating which is combined on the surface of the negative substrate; and the negative coating comprises a Li4Ti5O12-graphene composite. The invention also discloses a preparation method for the Li4Ti5O12-graphene composite. The lithium ion battery has high energy density, high power density, better circulation performance and stable performance. The preparation method for the Li4Ti5O12-graphene composite is a simple in process and has high production efficiency.

Sterically stabilized second-order nonlinear optical chromophores and devices incorporating the same are embodied in a variety of chromophore materials. An exemplary preferred chromophore includes an electron donor group, an electron acceptor group and a ring-locked bridge structure therebetween, with the bridge structure being directly connected to the electron donor via a single bond. Another exemplary preferred chromophore includes an electron donor group, an electron acceptor group and a ring-locked bridge structure between the electron donor group and the electron acceptor group, with two free double bonds, one located between the donor and the bridge and the other located between the (fused) ring bridge and the acceptor. Another exemplary preferred chromophore includes an electron donor group, an electron acceptor group, and a bridge structure therebetween, with the chromophores having no carbon-carbon double bond between the donor and the (fused) ring bridge. In this class, there is only one unlocked carbon-carbon double bond between the (fused) ring bridge and the acceptor. Another exemplary preferred chromophore includes an electron donor group, an electron acceptor group, and a ring-locked bridge structure therebetween, with a built-in electron-withdrawing cyano group on the last ring of the (fused) bridge. Another exemplary preferred chromophore includes any electron donor group, an electron acceptor group including a linear conjugated triene bearing four cyano groups, and any bridge structure therebetween.

The invention provides an aluminium titanate-mullite-corundum sagger as well as a preparation method and an application thereof and relates to the technical field of refractory materials. The aluminium titanate-mullite-corundum sagger mainly adopts aluminium titanate, mullite with specific grain size, corundum powder with specific grain size, titanium dioxide, alumina, magnesia powder and yellow dextrin as raw materials, and has the advantages of long service life and low use cost; besides, the raw materials are widely sourced and low in cost; the preparation method of the aluminium titanate-mullite-corundum sagger adopts simple technological steps, processing is simple and convenient, and the sagger has the advantages of low cost, high performance cost ratio and long service life. When the aluminium titanate-mullite-corundum sagger is applied to production of a lithium-ion battery cathode material, the production cost of ceramics can be effectively reduced due to the fact that the aluminium titanate-mullite-corundum sagger has the advantages of low cost, high performance cost ratio and long service life.

The invention relates to a TiO2 nanosheet vertically growing on the surface of a carbon-based electrode and a preparation method of the TiO2 nanosheet and belongs to the technical field of the nanomaterials. The preparation method of the TiO2 nanosheet comprises the following four steps: performing pretreatment on a substrate; performing an in-situ hydrothermal reaction on the pretreated substrate in a sodium hydroxide solution, which is a process of dissolution and recrystallization, and adding a certain amount of structural inducer to form a nanosheet array evenly grown in such a manner of being perpendicular to the surface of the substrate; performing washing and acid soaking, namely repeatedly washing the generated TiO2 nanosheet by use of ultrapure water after the reaction is completed and soaking the TiO2 nanosheet in an acid until the TiO2 nanosheet is neutral; and calcining for a while at a certain temperature in an N2 protection atmosphere to obtain the single-crystal vertically grown TiO2 nanosheet. The TiO2 nanosheet has excellent biocompatibility, stability and environmental friendliness; the preparation method is simple; the vertically grown TiO2 nanosheet is capable of reducing the resistance to electron transfer and can be applied to a microbial fuel cell (MFC) to improve electric quantity output.

The invention relates to the field of alkaline redox flow battery energy storage, in particular to a preparation method of an ion exchange membrane for an alkaline redox flow battery, which is mainlyused for solving the problem of the high price of a Nafion diaphragm in the alkaline redox flow battery at the present stage, so that the cost of the redox flow battery is greatly reduced. An alkalineaqueous solution of ferricyanide (such as Na3[Fe(CN)6], K3[Fe(CN)6], (NH4)3[Fe(CN)6] and the like) is used as a positive electrolyte, and a strong alkaline solution (such as KOH, NaOH and the like) is used as a negative electrolyte; graphite felt and carbon felt are selected as positive electrode materials, and a zinc plate is selected as a negative electrode material; and the ionized sulfonatedpolyether ether ketone (SPEEK) diaphragm is used as an ion exchange membrane to assemble the battery. Therefore, the alkaline redox flow battery system with low cost and high performance is obtained.The flow battery system provided by the invention has the advantages of the high open-circuit voltage, the low cost, the high efficiency, the good cycling stability, safety, reliability and the like,and has a wide application prospect.

The invention provides a method for preparing bleeding stopping oxidized celluloses in ramie oxidation degumming procedures. The method includes smashing raw ramie to obtain short fibers and soaking the short fibers to sufficiently moisten the short fibers and allow the short fibers to sufficiently swell; mixing the pretreated raw ramie short fibers and degumming solution with one another to obtain mixtures, heating the mixtures, then preserving heat, sufficiently removing colloid in the raw ramie by the aid of oxidability of specific oxidizing agents and simultaneously oxidizing celluloses with active hydroxyl to obtain oxidized celluloses with a large quantity of carboxyl; soaking oxidized and treated fibers by the aid of organic solvent aqueous solution and removing the unreacted oxidizing agents; separating the oxidized celluloses from water and carrying out drying treatment on the oxidized celluloses to ultimately obtain the powdery bleeding stopping oxidized celluloses. The method has the advantages that processes are simple, the original two working procedures are combined into a single working procedure, accordingly, the total reaction time can be shortened, medicines and the cost can be saved, and the efficiency can be greatly improved; the bleeding stopping oxidized celluloses which are products prepared by the aid of the method are high in bleeding stopping speed and bleeding stopping efficiency and can be widely applied to quickly stopping bleeding under conditions of war wound, trauma and the like, and stable effects can be realized.

The invention discloses a silicon fluoride self-cleaning glass nano-material, which is composed of solvent and active ingredients; the active ingredients are fluorinated modified silicone nano-particles, and the reaction raw materials comprise ortho-silicon ester and fluorine modified alkyl silane, with the ratio volume and dosage reaching 1.5-3:0.15-1.8. The invention also discloses a manufacturing method for the silicon fluoride self-cleaning glass nano-material, comprising two steps: synthesizing the surface modification of silica nano-particles, silica nano-particles; the ratio between volume and dosage for each added reactant is as follows: solvent: water: ortho-silicon ester: fluorine modified alkyl silane equals to 100: 1.5-3: 1.5-3: 0.15-1.8. The invention has simple production process, stable product performance, higher storage stability, excellent chemical properties, low surface energy and good tolerance against pollution, which is used for glass surface treatment; the contact angle between water and coating is greater than 110 degrees.

The invention discloses a transparent dielectric paste, comprising an organic carrier and inorganic glass powder dispersed in the organic carrier, wherein the mass ratio of the inorganic glass powder to the organic carrier is 60:40-90:10; the inorganic glass powder comprises PbO, B2O and SiO2 based on the mass ratio of 60-80:6-15:10-30; and the organic carrier comprises an organic solvent with the boiling point of 150-300 DEG C and a resin with the decomposition temperature of 200-350 DEG C, and the mass ratio of the organic solvent to the resin is 85:15-97:3. The transparent dielectric paste provided by the invention is formed by evenly dispersing the inorganic glass powder with insulating performance in an organic medium. The transparent dielectric paste can form a transparent dielectric layer which has high transmittance and surface flatness, proper thermal transition temperature and thermal expansion coefficient matched with substrate glass.

The invention provides low-melting point glass powder and a manufacturing method thereof; on a weight basis, the low-melting point glass powder comprises: 20-55% of Bi2O3, 10-30% of B2O3, 5-15% of ZnO, 15-40% of BaO, 0.5-5% of CuO, 0.5-2% of MgO, and 0.2-5% of halide. The low-melting point glass powder does not contain harmful elements of lead, vanadium, thallium, tellurium, and the like, has a low thermal expansion coefficient, good chemical stability, wetability and fluidity. In addition, the low-melting point glass powder has low Bi2O3 content, and thus has low manufacturing cost.

The invention relates to a foaming agent subjected to surface modification by fluorosilane and a preparation method thereof. The foaming agent subjected to surface modification by fluorosilane comprises a foaming agent and fluorosilane; based on 100 weight parts of foaming agent, 0.001 to 10 weight parts of fluorosilane is used; and the grain size of the foaming agent is 1 to 100 mu m. The preparation method comprises the following steps of: adding the fluorosilane into the foaming agent in the weight proportion, and mixing with the foaming agent in a mixer for 10 to 30 minutes, so that the fluorosilane uniformly covers the surface of the foaming agent. The invention has the advantages that: by the treatment method, the surface of the foaming agent is covered by the fluorosilane, good hydrophobicity and dispersibility are shown, and the foaming agent cannot agglomerate for a long time; and the fluidity of the power of the foaming agent and the dispersibility of the foaming agent in thermoplastic resin and rubber can be obviously improved.

The glass-ceramic joining material, which is suitable for bonding or joining at low processing temperatures, especially less than 800° C., is composed of a BaO—SiO₂—CaO—B₂O₃—Al₂O₃ system and has a coefficient of thermal expansion α_(20-300)≧9.5·10⁻⁶ K⁻¹.

The invention provides a montmorillonite-based nano composite heat insulation coating and belongs to the technical field of heat insulation materials used in equipment or buildings. The coating comprises the following components in percentage by mass: 5 to 30 percent of montmorillonite, 15 to 30 percent of vinyl acetate/acrylic emulsion or styrene-acrylic emulsion, 30 to 50 percent of water, 5 to 10 percent of nano calcium carbonate, 2 to 6 percent of nano zinc oxide, 2 to 6 percent of nano titanium oxide, 0.01 to 0.1 percent of film-forming auxiliary, 0.1 to 2 percent of antifoaming agent, 0.1 to 2 percent of wetting dispersant, 0.5 to 2 percent of antifreezing agent and 0.1 to 2 percent of leveling agent. A method for preparing the coating comprises the following steps of: under the condition of low-speed stirring, stirring the water, the montmorillonite, the wetting dispersant and a half of the antifoaming agent at a high speed for 1 to 2 hours; adding the nano calcium carbonate, the nano zinc oxide and the nano titanium oxide into the mixture with stirring; stirring at a high speed for 3 hours; under the condition of low-speed stirring, slowly adding the emulsion dropwise and consequently adding the rest antifoaming agent, the film-forming auxiliary, the antifreezing agent and the leveling agent into the mixture; stirring for 3 to 4 hours at a low speed; and finally canning to obtain the finished product of the coating. The montmorillonite-based nano composite heat insulation coating has the advantages of good energy saving effect, stable performance, safe use and convenient application.

The invention provides an external pressure type hollow fiber membrane component. The upper end of the membrane component is provided with a first water inlet and a first epoxide resin body; the lower end of the membrane component is provided with a second water outlet and a second epoxide resin body; the upper end and the lower end of a hollow fiber membrane filament in the membrane component are respectively fixed and communicated with the first water outlet and the second water outlet; fluid distributing elements are embedded inside the second epoxide resin body; the fluid distributing elements are provided with fluid distribution holes exposed on the upper surface of the second epoxide resin body and are communicated with an outside fluid source. The membrane component can realize that two ends of the external pressure type hollow fiber membrane component discharge water, gas and liquid are uniformly distributed, mud can be discharged from the membrane component by low position, the production and the processing are easy to realize, and the requirements of large-sized film membranes are met. The invention also provides a using method of the hollow fiber membrane component, which can more thoroughly clean the membrane component and prolong the filter-clean cycle of the membrane component.

The invention relates to a preparation method of a diatomite and paraffin composite phase change material. The preparation method comprises the following steps: dissolving a phase change material paraffin in petroleum ether in a water domain at a certain temperature and stirring; then, adding a carrier diatomite with nanoscale porous structures, and continuously stirring, so that the porous structures of diatomite can be fully contacted with the phase change material to adsorb sufficient paraffin; and then, raising the temperature of the water domain to 75 DEG C, evaporating the solvent petroleum ether, then condensing and recovering the solvent petroleum ether and drying to obtain a powder composite energy storage material. The composite phase change material provided by the invention is not changed in shape in the phase change process, and paraffin is not leaked. Moreover, the composite phase change material is simple in preparation process, low in cost and energy-saving and environmentally friendly, and the solvent can be recycled.

The invention provides a polyamide-based powdery alloy material. The powdery alloy material comprises, by mass, 97-99.8% of polyamide alloy, 0.1-2% of a powder flow aid and 0.1-1% of a powdery antioxidant, the polyamide alloy comprises polyamide, a compatilizer and special engineering plastic or thermoplastic polyester, and the melting point of the polyamide is same or similar to that of the special engineering plastic or thermoplastic polyester. The melting point of the polyamide is same or similar to that of the special engineering plastic or thermoplastic polyester, so basic requirements ofa selective laser sintering technology are met; the disadvantages of the polyamide resin material are made up through the low hydroscopicity of the special engineering plastic or thermoplastic polyester; and the powdery alloy material has good powder fluidity, and a product formed by sintering the powdery alloy material has good physical and mechanical performances.

The invention relates to the technical field of batteries, and particularly relates to a battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps: carrying out heat treatment on spiral carbon nanofibers to obtain modified spiral carbon nanofibers; and by taking modified spiral carbon nanofibers as a matrix and butyl titanate as a titanium source, loading TiO2 nanoparticles on the surfaces of the modified spiral carbon nanofibers through a low-temperature solvothermal method to form the spiral carbon nanofiber loaded TiO2 composite battery negative electrode material. According to the invention, the spiral carbon nanofibers have a special spiral structure and a large specific surface area, and are mutually stacked to form a three-dimensional reticular support structure so that the dispersity of nano TiO2 can be improved, and meanwhile, a large amount of nano TiO2 can provide more two-dimensional diffusion channels for sodium ions. Through related tests, the prepared sodium battery has excellent specific capacity and cycling stability.

The present invention discloses a silk-screen printing electrode sensor preparation method based on ionic liquid-multi-wall carbon nano-tube modification, and belongs to the technical field of biological sensors. According to the method, an ionic liquid-multi-wall carbon nano-tube nanometer material is prepared and then coats the surface of a silk-screen printing carbon electrode in a dropwise manner, and then acetylcholine esterase coats the surface of the ionic liquid-multi-wall carbon nano-tube nanometer material modified silk-screen printing work electrode in a dropwise manner so as to prepare the acetylcholine esterase biological sensor for detecting organic phosphorus and carbamate pesticides. According to the present invention, the prepared sensor has characteristics of simple process, easy operation, low cost, high detection sensitivity, strong electrical signal and simple electrode pretreatment, and is suitable for detection of pesticide residues, wherein the detection limit is 0.05 [mu]g/L.

The invention relates to a CO2 absorbent and a preparation method thereof. The absorbent is composed of organic amine and alkali metal oxide in a mass ratio of (0.01-100):1. The preparation method comprises the following steps: dissolving the organic amine in water, adding the alkali metal oxide, and maximally dispersing the metal oxide in the water in a suspension state by ultrasonic or stirring, thereby obtaining the product. The absorbent has higher trapping property for CO2.

The invention relates to a method for preparing metal titanium by electro-deoxidization and specifically relates to the method for preparing the metal titanium by taking ionic liquid as an electrolyte and performing the electro-deoxidization at room temperature. The method comprises the following steps: performing electrolysis at the room temperature by taking the ionic liquid as the electrolyte, taking graphite as an anode and taking a prepared cathode as a cathode, wherein the ionic liquid is prepared by firstly preparing an intermediate of the ionic liquid from N-methylimidazole and halogenated alkane by adopting a light wave-ultrasonic wave synthesis method and further reacting the intermediate of the ionic liquid with sodium tetrafluoroborate for preparation. The method disclosed by the invention has the advantages of convenience in operation, high reaction speed, high efficiency and high yield, as well as high product purity and capability of reducing production period, so that the method is an environment-friendly, green and low-energy-consumption new method for preparing metal titanium by electro-deoxidization.