121results about How to "Strong covalent bond" patented technology

Described herein are substrates, sensors and systems related to measuring the concentration of an analyte such as hydrogen ion in a sample. Redox active moieties whose reduction and/or oxidation potentials are sensitive to the presence of an analyte are immobilized onto a silicon surface. Immobilized redox active moieties whose reduction and/or oxidation potential are insensitive to the analyte can be used for reference. Voltammetric measurements made using such modified silicon surfaces can accurately determine the presence and/or concentrations of analytes in a sample of interest. The silicon electrochemical sensors of the invention are robust and can be made so as not to require calibration or re-calibration.

This invention relates to a method of coating a metal surface by applying a solution containing an alkanethiol compound and a solvent to a metal surface, allowing the formation of a self-assembled monolayer, which presents as a robust barrier to corrosion. The alkanethiol compounds have a general formula, R(CH₂)_nSH, where R represents methyl, carboxyl, hydroxyl, formyl, or amide; n is in the range of 7 to 21, preferably in the range of 12 to 18.

The invention discloses a preparation method of a polyamine nanoparticle self-assembled nanofiltration membrane. Polyamine monomer molecules are adopted as raw materials, polyamine is taken as a bionic adhesive, the polyamine nanoparticles are formed through auto-polymerization in an aqueous solution, and the polyamine nanocomposite nanofiltration membrane is prepared by in-situ self-assembly and interfacial cross-linking on the surface of a porous support membrane. By regulation of the surface self-assembly behavior and the interfacial crosslinking process of the polyamine nanoparticles, the thickness, the crosslinking degree and surface properties of a nano-separation layer can be optimized, and the nanofiltration membrane with high permeation selectivity and good stability can be obtained. The water flux of the nanofiltration membrane in operating pressure of 0.6MPa is 80-150 Lm<-2>.h<-1>, the organic matter molecular interception rate can be as high as 98%, and the inorganic salt ion interception rate is generally lower than 30%. Therefore, the prepared polyamine nano-composite nanofiltration membrane has high separation selectivity and water permeation flux; the preparation method of the membrane is simple, convenient, controllable and low in cost, thereby having good industrial application prospect.

A method of treating a shape memory alloy to improve its various characteristics and to cause it to exhibit a two-way shape memory effect. A raw shape memory alloy having a substantially uniformly fine-grained crystal structure is prepared and then its crystal orientations are arranged substantially in a direction suitable for an expected operational direction, such as tensile or twisting direction or the like, in which the shape memory alloy is expected to move when used in an actuator after the completion of the treatment.

The invention discloses a surface modification method of a high-nickel ternary material lithium nickel cobalt manganate. The surface modification method comprises the following steps of (1) accordingto a preset coating material and a coating amount, weighing nitrate and ammonium dihydrogen phosphate based on stoichiometric ratio, and dissolving nitrate and ammonium dihydrogen phosphate in a proper amount of absolute ethyl alcohol; (2) weighing a certain amount of main material, slowly adding into the mixed solution, and performing stirring for a certain time until the absolute ethyl alcohol is completely volatilized; and (3) carrying out drying on the prepared product at a certain temperature for several hours, and putting the dried product into a tubular furnace, and carrying out calcining for several hours at a certain temperature in an air atmosphere, and then carrying out grinding and sieving treatment to obtain the product. According to the surface modification method provided bythe invention, absolute ethyl alcohol is used as a solvent, and phosphate coating is carried out on NCM622 by adopting a wet chemistry method, so that the prepared lithium ion battery ternary positive electrode material is uniform in particle size distribution, clear in particle boundary, and relatively high in secondary particle spherical structure, and has high rate performance and cycling stability.

The invention discloses a method for preparing an in-situ polymerization amphoteric polyamine nanoparticle modified polyamide nanofiltration membrane. The method comprises the following steps: taking an amphoteric polyamine monomer molecule as a raw material, taking dopamine as a bionic adhesive, and performing in-situ polymerization in an aqueous solution to form amphoteric polyamine nanoparticles; and adding dopamine monomer molecules into the aqueous solution, and preparing an amphoteric polyamine-containing nanoparticle-modified polyamide nanofiltration membrane through interfacial polymerization. By utilizing the unique nano-pore structure and good hydrophilicity and adhesion stability of the amphoteric polyamine nanoparticles, the water permeation flux and anti-pollution stability of the membrane are greatly improved while maintaining a high retention rate of the polyamide membrane on an inorganic salt. The preparation method of the amphoteric polyamine-containing nanoparticle-modified polyamide nanofiltration membrane prepared by the invention is simple and feasible, in-situ generated particles have uniform and stable distribution in the membrane, the cost is low, and the method has excellent industrialized application prospects.

The invention discloses self-repairing, low-damage and ultra-high temperature-resistant fracturing fluid, which is prepared from the following components by mass percent: 0.4-0.8wt% of polymer thickening agent, 0.015-0.02wt% of non-metallic crosslinking agent, 0.04-0.06wt% of gel breaker and the balance of water, wherein the polymer thickening agent is prepared by polymerizing acrylamide, acrylicacid, 2-acrylamido-2-methylpropanesulfonic acid, a rigid monomer and a cationic hydrophobic monomer according to a weight ratio of (55-70) to (15-20) to (15-20) to (0.5-3) to (0.1-1.0), the polymerization temperature is 30-40 DEG C, and the polymerization time is 8-10h. After the self-repairing, low-damage and ultra-high temperature-resistant fracturing fluid is adopted, the technical problem thatthe traditional fracturing fluid is easy to decompose at the high temperature, so that the performance of the fracturing fluid is influenced can be effectively solved.

The invention provides a preparation method for graphene oxide modified polymer cement-based anti-corrosive paint. The preparation method comprises the following steps: performing carboxylation of a graphene oxide; synthesizing graphene oxide modified polyacrylate emulsion; and preparing the graphene oxide modified polymer cement-based anti-corrosive paint. The paint prepared by the preparation method has the advantages of high toughness, high bonding strength and high compactness and the like of an organic polymer, and has high mechanical strength and high weather resistance and durability ofa special cement-based material. The graphene oxide is used for modifying the polymer cement-based anti-corrosive paint, a mechanical property of a polymer film is further optimized, interface compatibility and a bonding force of a polymer organic component and a cement-based inorganic component are improved, thereby a paint microscopic structure is optimized, and anti-corrosion performance and stability are improved.

The invention relates to a leather greasing agent endowing leather with a function of shielding ultraviolet ray and a preparation method thereof. At present, leather processing aid develops in the direction of being environment-friendly, degradable and functional. The leather greasing agent disclosed by the invention is prepared by the following steps: preparing TiO2-ZnO composite nanoparticles by virtue of a precipitation method, carrying out hydrophobic modification by virtue of a modifier and introducing the nanoparticles to a hydrogenated castor oil matrix; and carrying out succinic acid esterification and sulfonation, thus finally preparing the hydrogenated castor oil-based nano-TiO2-ZnO composite leather greasing agent. The greasing agent disclosed by the invention, on the basis of excellent ultraviolet ray shielding performance of the TiO2-ZnO composite nanoparticles, can endow the greased leather sample with the function of shielding ultraviolet ray; and meanwhile, by virtue of a 'bridged linkage' function between an organic group on the surfaces of the TiO2-ZnO composite nanoparticles and the hydrogenated castor oil matrix, an inorganic-organic phase separation phenomenon is improved.

The invention discloses a modifying agent used for strengthening dimensional stability of compound wax emulsion of quick-growing wood. The modifying agent is prepared from the following raw materials in parts by weight: 3-3.5 parts of formaldehyde, 2-3 parts of urea, 1.5-2 parts of hexamethylenetetramine, 0.02-0.03 part of maleic anhydride, a proper amount of acetic acid, a proper amount of ammonia water, a proper amount of deionized water, 20-23 parts of dihydroxymethyl dihydroxyl ethylene urea with solid content being 42wt%, 1.5-2 parts of magnesium chloride hexahydrate, 10-11 parts of silica sol, 3-4 parts of paraffin, 2-3 parts of microcrystalline wax, 3-4 parts of fatty alcohol-polyoxyethylene ether and 2-2.5 parts of polyvinyl alcohol. The modifying agent disclosed by the invention is good in stability, is safe and environmentally-friendly and is suitable for industrial production; impregnation pressure treatment is carried out on the quick-growing wood, so that the modifying agent can penetrate into the wood to achieve waterproof and flexible effects, and therefore, the modified wood is not liable to crack, is resistant to moisture, is good in dimension stability; and furniture manufactured from the wood is strong and durable in use, is waterproof and mildew-proof, and can be used outdoors.

The invention relates to a silicious organic phosphonium salt antibacterial finishing agent. The chemical structure of the antibacterial finishing agent is shown as the accompanying drawing, wherein R1, R2 and R3 are long-chain alkyl groups, methyl groups, ethyl groups, propyl groups, phenyl groups, butyl groups, benzyl groups or aromatic ring substituent groups of C8 to C18, R4 is a methyl group, a ethyl group or a propyl group, and n is 1 to 10. A preparation method of the antibacterial finishing agent includes the following steps that: compound containing tertiary phosphine and halogenated alkyl organosilicon coupling agent are dehydrated in advance, and are then mixed in alcohol solvent according to the molar ratio of 1:0.9 to 1.2, reflux reaction is carried out under the protection of nitrogen, the reaction solvent and the residual reaction material are removed under vacuum, the pressure and the temperature are reduced, and organic solvent is added to dissolve a product. The antibacterial finishing agent can ensure that a fabric has a broad-spectrum antibacterial property, washing fastness and good environmental safety; moreover, the operation of the preparation method is simple, the materials can be conveniently obtained, the preparation method is environment-friendly and suitable for industrial production, and therefore the invention has good application prospect.

The invention discloses a preparation method of an ultra-low-pressure and high-flux metal-organic nano particle assembly nanofiltration membrane. Polyamine molecules and polyoxometalates serve as rawmaterials, dopamine serves as a biomimetic adhesive, and organic nano particle seeds loaded with metal ions are generated in a water solution through oxidation polymerization; the surface of a poroussupport membrane is coated with an aqueous dispersion of the nano particle seeds, and a membrane is formed through assembly; the membrane is soaked with an organic ligand solution, metal-organic nanoparticles are formed on the surface of the membrane, and finally, through interface crosslinking, the high-permselectivity and high-stability metal-organic nano particle assembly nanofiltration membrane is obtained. The metal-organic nano particle assembly nanofiltration membrane prepared by using the preparation method has the advantages that the structure and the characteristics of the membranecan be controlled, the operation pressure is low, the water flux is high, the separation selectivity is high, and the preparation method is simple and suitable for industrialized application.

The invention discloses a low-temperature-deflection-resistant perforated gas-permeable polyvinyl chloride artificial leather and a preparation method thereof, wherein the artificial leather comprises a base cloth layer, a PVC foaming layer, a PVC compact layer and a paint layer. According to the present invention, the low-temperature-deflection-resistant perforated gas-permeable polyvinyl chloride artificial leather prepared by using the formula and the preparation method has characteristics of good mechanical strength, strong toughness, wear resistance and strong low-temperature-deflection resistance, further has advantages of gas permeability and comfort similar to the leather, and further has characteristics of good hand feeling and high security.

The invention discloses a three-dimensional graphene-based heterogeneous Fenton catalyst, and a preparation method and an application thereof. The preparation method comprises the following steps: (1)preparation of a sodium alginate solution and a metal ion solution, and mixing for obtaining an alginate gel; and (2) high-temperature calcination of the above alginate gel in a protective atmosphereunder the catalysis of a metal substrate to obtain the high-quality three-dimensional graphene-based heterogeneous Fenton catalyst. Graphene and a metal catalysis component in the final product are combined by firm covalent bonds, so electron transport is promoted, the heterogeneous Fenton catalysis performance is improved, and the problem of metal ion leakage is avoided. Sodium alginate utilizedby the preparation method is a natural biological macromolecule with a wide source and a low cost, so the preparation method has the advantages of simplicity, high efficiency, greenness and environmental protection, and the obtained product is uniform and porous, has a controllable shape, has excellent adsorption performance and excellent heterogeneous Fenton catalysis property, and achieves easyseparation of the solid and liquid.

The invention provides a polymer medical instrument with a hydrophilic lubricating coating and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing a hydrophilic polymer material, an initiator and a solvent to obtain a precursor solution of the hydrophilic lubricating coating; (2) carrying out oxygen plasma treatment on the polymer medical instrument,and then soaking the polymer medical instrument in a pretreatment solution, wherein the pretreatment liquid contains a photoinitiator; and (3) coating the surface of the polymer medical instrument treated in the step (2) with the precursor solution obtained in the step (1), and then carrying out photocuring to obtain the polymer medical instrument with the hydrophilic lubricating coating. The polymer medical instrument with the hydrophilic lubricating coating has the stable and long-acting super-lubricating and hydrophilic characteristics, the monomer polymerization process does not exist in the preparation method of the polymer medical instrument, and it can be guaranteed that the hydrophilic lubricating coating has excellent biocompatibility.

A high-speed optical transceiver for an integrated circuit (IC) includes a serializer-deserializer (SERDES) and a vertical cavity surface emitting laser (VCSEL) combined with a detector array. By covalently bonding the SERDES die to the IC, the two components can be processed simultaneously to produce a tightly aligned, high-speed data interface. The SERDES can be coupled to the VCSEL/detector array using a flex interconnect, or the VCSEL/detector array can also be covalently bonded to the IC or SERDES to maximize data bandwidth. The SERDES and VCSEL/detector array can also be produced in a single die using a process technology appropriate for both to maximize manufacturing efficiency.

The invention discloses a method for modifying a phosphate-coated lithium-rich manganese-based cathode material and belongs to the field of lithium ion battery cathode materials. The method comprisescoating steps of: 1) uniformly dispersing a prepared lithium-rich cathode material in a mixed solution of deionized water and an organic solvent to obtain a solution A; 2) dissolving gadolinium nitrate and phosphate in the deionized water to prepare solutions B and C; 3) adding the solutions B and C to the solution A under a room-temperature stirring state, and adjusting the pH value of the solution to 8 to 11 in order that the solutions B and C react and are in-situ deposited onto the surface of the lithium-rich material; 4) stirring and ageing the solution for 2 to 5 hours, performing oil bath evaporation to dryness and performing grinding to obtain a coated precursor; and 5) calcining the coated precursor in an atmosphere at 450 to 600 degrees centigrade for 4 to 6 hours, and naturallycooling the coated precursor to room temperature to finally obtain the GdPO4-coated lithium-rich manganese-based cathode material. The method uses the wet chemical deposition method to in-situ coat the surface of the lithium-rich manganese-based cathode material with the GdPO4, is easy to operate, inhibits the corrosion of the surface of the material by an electrolyte, stabilizes the structure ofthe material, reduces oxygen loss, and has wide application prospects.

The invention relates to the field of electrochemistry, and especially relates to a high-specific-energy sodium-ion battery manganese-based layered positive electrode material. The general formula of the material is NaxLiyMn1-y-zMzO2, wherein M is Ru, Ni, Cu, Zn, Mg or Ti, x is more than or equal to 0.5 and less than or equal to 1, y is more than 0 and less than or equal to 0.33, and z is more than 0 and less than or equal to 0.33. In the positive electrode material, the Li element occupies the transition metal layer, and the Li-O-Na configuration triggers the non-hybrid energy level of oxygen and triggers the oxidation reduction of oxygen. According to the high-specific-energy sodium-ion battery manganese-based layered positive electrode material, a small amount of other metal M is uniformly doped, and a stronger covalent bond is formed relative to manganese and oxygen, so that the structural stability of lattice oxygen after electrons near oxygen are removed is improved, and the cycling stability of the sodium-ion battery is improved.

The invention discloses a preparation method of antiviral regenerated cellulose fibres, and fibres thereof. The preparation method comprises the following steps of: (1), mixing a monovalent copper compound with a carrier, adding a dispersing agent and a stabilizing agent, adjusting pH, then, grinding and mixing, and preparing copper ion antiviral paste; and (2), adding the copper ion antiviral paste and a chelating agent into cellulose spinning gel solution in a double injection manner, and then, spinning, so that the antiviral regenerated cellulose fibres are obtained. The antiviral regenerated cellulose fibres prepared by the invention contain polyvalent copper, can effectively inhibit microbial reproduction for a long time, and have relatively antiviral and antibacterial effects; and the fibres in the invention also can be blended and interwoven with other fibres, and used for producing different types of antiviral and antibacterial textiles.

The invention discloses a negative electrode pole piece and a preparation method thereof. The negative electrode pole piece comprises a current collector, a negative electrode composite material layerarranged on the current collector and a coating layer deposited on the negative electrode composite material layer through a pulse laser method, and the negative electrode composite material layer isprepared from a solid electrolyte and a negative electrode active material; and the negative electrode active material is a carbon negative electrode material, and the material of the coating layer is selected from lithium phosphate, lithium silicate or lithium vanadate. The preparation method comprises the following steps: S1, mixing a negative electrode active material and a solid electrolyte to form a negative electrode composite material, carrying out mechanical ball milling, adding a conductive agent, a binder and an organic dispersing solvent to prepare slurry, coating a current collector with the slurry, and conducting drying to form a negative electrode base material; and S2, using lithium phosphate or lithium silicate to prepare a target, depositing lithium phosphate or lithium silicate on the negative electrode base material, and conducting cooling to obtain a coating layer with the thickness of 1-100nm after deposition is completed, thereby preparing the negative electrodematerial. The lithium ion battery has the advantages that the cycle life is long, and the safety performance of the battery is improved.

The invention relates to the technical field of composite materials, in particular to a preparation method of a modified glass fiber resin composite material. The method comprises the following steps: mixing graphene with a sulfuric acid solution and a nitric acid solution, and uniformly stirring to obtain a mixed solution; mixing a part of the mixed solution with unsaturated polyester resin slurry, adding absolute ethyl alcohol, and performing ultrasonic treatment to obtain a component A; mixing and stirring a silane coupling agent and deionized water, and adding a pH regulator to adjust the pH value to obtain a component B; mixing the other part of the mixed solution, the component A, the component B, a phenolic resin matrix and glass fibers, modifying the glass fibers to obtain a castable, and sequentially pouring, curing and curing the castable to obtain the modified glass fiber resin composite material. According to the invention, the modified glass fiber resin composite material generates firm covalent bond combination, the interfacial shear strength of the resin composite material is improved, the mechanical property of the resin composite material is improved, and the service life of the resin composite material is prolonged.