223results about How to "No aggregation" patented technology

The invention provides a preparation method of a silk fibroin/metal nanoparticle composite system, belonging to the technical field of nanocomposite materials and preparation methods thereof. The preparation method comprises the steps of fully mixing metal nanoparticles with silk fibroin in a weight ratio of (1:9)-(9:1) so that silk fibroin is non-covalently adsorbed on the surfaces of the metal nanoparticles, thus obtaining the silk fibroin/metal nanoparticle composite system. The metal nanoparticles in the composite system prepared by the preparation method can not aggregate under the conditions that the pH value is 2-11 and the salinity is 0-1000mM, thus improving the stability and biocompatibility of the metal nanoparticles in the physiological environment. The silk fibroin/metal nanoparticle composite system provided by the invention is simple to prepare, is low in cost, has good stability and biocompatibility and has wide application prospects in the biomedical fields of drug sustained release, gene transmission, tissue engineering and the like.

The invention provides an electric power inspection robot positioning method based on multi-sensor fusion, and the method comprises the steps: firstly carrying out the preprocessing of data collectedby a camera, an IMU and a speedometer and the calibration of a system, and completing the initialization of a robot system; secondly, extracting a key frame, and performing back-end optimization on the position, the speed and the angle of the robot and the bias of a gyroscope in the IMU by utilizing the real-time visual pose of the key frame to obtain the real-time pose of the robot; then, constructing a key frame database, and calculating the similarity between the current frame image and all key frames in the key frame database; and finally, performing closed-loop optimization on the key frames in the key frame database forming the closed loop, and outputting the pose after closed-loop optimization to complete positioning of the robot. According to the back-end optimization method provided by the invention, the positioning precision is improved; and closed-loop optimization is added in the visual positioning process, so that accumulated errors existing in the positioning process areeffectively eliminated, and the accuracy under the condition of long-time operation is guaranteed.

The invention provides a cellulose/silver chloride composite material and a preparation method thereof. The cellulose/silver chloride composite material is quickly prepared by adopting microcrystalline cellulose, sliver salt and chlorine compound as the materials, adopting water as solvent and adopting an ultrasonic-wave treatment method. The cellulose/silver chloride composite material prepared by the preparation method disclosed by the invention is uniform in silver/ silver chloride nanometer particle, capable of being uniformly distributed on a cellulose substrate and is extensive in application prospect in the antibacterial filed and the photocatalysis filed. Moreover, according to the preparation method disclosed by the invention, the materials are cheap, the process is simple, the operation is convenient, the preparation is quick and the process conditions are easy to control, so that the production process is greatly simplified, the time is saved and the cost is reduced. Meanwhile, the preparation method is free of any expensive and complex equipment and is beneficial to the industrial popularization.

The invention discloses a two-stage particle swarm optimization algorithm including independent global search. The two-stage particle swarm optimization algorithm comprises the following steps: species initializing; adopting the chaotization method for initializing the positions X and the speeds V of particles; adopting the fitness function (fitness) to calculate the adaptive values of all current particles, and initializing the record optimal position (pbesti) of each particle and the global optimal position (gbest) of all the particles; carrying out the first stage iterative-global search; carrying out the second stage iterative-local search. The two-stage particle swarm optimization algorithm has the benefits that during each iteration of the first stage iterative-global search, one non-self particle is randomly selected from all the particles for learning, and the random selection guarantees that the species is prevented from tracking the specific particle and that the aggregate phenomenon is avoided; the second stage iterative-local search can quickly converge and can obtain solutions high in accuracy, the accuracy of the optimal solution is increased, and the prematurity defect is remarkably improved.

The present invention relates to nanometer organic paint and its preparation process, and is especially one kind of nanometer mesoporous organic silica particle paint and is preparation process. The nanometer mesoporous organic silica particle paint consists of nanometer mesoporous silica particle 2.5-10 wt%, dispersant 0.5-5 wt%, dibutyl phthalate 0-10 wt% and solvent 5-25 wt%, except filming agent. The nanometer mesoporous silica particle may be also modified nanometer mesoporous silica particle. The preparation process includes mixing the said materials, and grinding at normal temperature and normal pressure to disperse to form the mother liquid. The present invention has effectively improved dispersivity of nanometer particle in paint and raised compatibility between inorganic nanometer particle and organic base.

The invention provides a reverse circulation drilling device for a soft projecting coal seam. The device comprises a drilling machine, an active double-wall drilling rod, a double-channel pneumatic faucet; a power head is arranged on the drilling machine; the active double-wall drilling rod passes through the power head to be mounted; an inner pipe at one end of the active double-wall drilling rod is connected with a rubber pipe through the double-channel pneumatic faucet; a pulverized coal receiving device is connected to the tail end of the rubber pipe; an air box which communicates with internal and external pipe annular channels of the active double-wall drilling rod is arranged on the double-channel pneumatic faucet; the air box is connected with an air compressor through an air pipe; a drill bit is connected to the other end of the active double-wall drilling rod. With the adoption of the device, the disturbance to the coal seam can be minimized, so that the collapse in holes can be effectively prevented, and that the frequent drilling blocking accidents can be avoided; the circumstance that gas is concentrated is prevented, and therefore, the phenomenon of blowout through the holes can be effectively avoided; the production cost is low; in addition, the working environment at the construction field can be effectively improved; the purpose of drilling in collapse and reducing stratums synchronously by one drilling rod can be achieved.

The invention discloses a method for preparing industrial ultra-fine activated calcium carbonate from a carbide slag, and particularly relates to preparation of employing O/W-type microemulsion. The technology disclosed by the invention comprises the steps of extracting calcium in the carbide slag by saturated ammonium chloride solution, and separating undissolved impurities to filter and obtain calcium chloride solution; reacting fatty acid and alkyl alcohol with sodium hydroxide solution, and adding petroleum ether to form microemulsion; fining microemulsion particles by ultrasound, slowly dripping the obtained calcium chloride solution under an agitation condition, dripping carbonate or bicarbonate solution after dripping, thereby respectively obtaining an upper layer of oil phase, a middle layer of opaque oil phase containing calcium carbonate sediment, and a lower layer of water phase after reaction and delivery are finished; and centrifugally separating, washing and drying the middle layer to obtain industrial ultra-fine activated calcium carbonate, wherein the oil phase and the water phase can be recovered to apply mechanically. By adopting the method, the processing problem of the carbide slag can be well solved; the obtained oil phase and water phase can be recycled; the cost is saved; the prepared light calcium carbonate surface is coated with a layer of fatty acid; the dispersibility is good; the problem that the product is easily gathered is solved; and the method has economical, social and environment-friendly concepts.

The invention discloses a preparation method of a highly dispersed nanocatalyst. The method comprises the following steps: (1) respectively preparing a metal salt solution and a precipitant solution,continuously dropwise adding the metal salt solution into the precipitant solution under continuous stirring, continuing the stirring, performing a primary low-temperature hydrothermal reaction, filtering, washing and drying the obtained product, performing a secondary low-temperature hydrothermal reaction, and performing filtration and vacuum drying on the obtained reaction product to obtain a metal oxide carrier rich in oxygen vacancies; and (2) loading a noble metal on the metal oxide carrier by adopting an impregnation technology, and performing temperature-programmed reduction in a hydrogen atmosphere to obtain the highly dispersed nanocatalyst. The method has the advantages of low cost, rich and easily available raw materials, mild preparation conditions and strong universality; andthe highly dispersed nanocatalyst prepared by using the oxygen vacancy supported noble metal has the advantages of good catalytic activity, good product selectivity and great potential industrial catalytic application potential.

The invention provides a preparation method for a PtCu/C catalyst, and belongs to the field of preparation methods for noble metal catalysts. The method comprises the following steps of mixing a copper source and a carbon support in a solution to obtain a suspension; mixing the suspension and sodium borohydride, and adding a citric acid solution to obtain a mixed solution; and mixing the obtained mixed solution and a platinum source to obtain the PtCu/C catalyst. According to the method, the citric acid solution is added in the reaction process to prevent the aggregation of nanoparticles, and the concentration of nitric acid is controlled to control the degree of wrapping of the citric acid on the surfaces of the nanoparticles, so that the degree of dispersion of the PtCu nanoparticles is controlled, and the methanol electro-oxidation catalysis performance is improved; the PtCu nanoparticles are uniformly dispersed, and are free of the aggregation, and the cyclic voltammetry curve of the PtCu/C catalyst in a methanol solution shows that the peak current density reaches 1,211mAmg<-1>.

The invention relates to an organic nano anti-corrosion coating and a preparation method thereof, in particular to the organic nano anti-corrosion coating which adds nano-scale mesoporous silica particles with special structure (which has the dual-nano structure, that is the nano-scale particle size and the nano-scale mesoporous structure) and the preparation method thereof. The preparation is as follows: taking the following components by weight percent: 2.5-10% of nano mesoporous silica particles, 0.5-5% of dispersant, 0-10% of dibutyl phthalate, 5-25% of solvent and the balance of film forming matter; grinding and dispersing under normal temperature and normal pressure; and preparing coating mother liquor. The organic nano anti-corrosion coating has a small adding amount and low production cost, and can overcome the shortcomings of difficult dispersion of the existing nano-filler and poor compatibility between nano-particles and an organic matrix.

A flexible graphene-based conductive composite thin film is disclosed. The composite thin film is composed of cellulose fibers, graphene and silver nanoparticles; the surface layer structure is a continuous silver nanoparticle film formed by mutually stacking silver nanoparticles, and the interior is composed of cellulose, graphene and silver nanoparticles. The cellulose fibers are skeletons, andthe inner silver nanoparticles are wrapped by graphene. The cellulose fiber-graphene-silver nanoparticle composite thin film of the structure has excellent conductivity with the square resistance being only 0.17 [omega]sq<-1>, and has excellent electrochemical performance; the maximum area specific capacitance is up to 1242.7 mF cm<-2>, and the rate performance is good; there is almost no loss ofcapacitance (the capacitance retention rate can still reach 99.7%) after 6000 times of repeated charge and discharge under the high current density of 60 mA cm<-2>, showing excellent the stability ofrepeated charge and discharge; and the energy density is high and the specific capacitance area is large.

A stable liposome composition used as the carrier of anticancer taxol is prepared from saturated hydrogenated phosphate, cholesterol, sodium (or potassium) cholesterol sulfate and cane sugar through thin-film evaporating-freeze-drying process.

The invention relates to a salbutamol immunomagnetic bead separation and enrichment kit which comprises magnetic beads, reconstitution fluid and a magnet, wherein the magnetic beads are coupled with a salbutamol monoclonal antibody; the magnetic beads coupled with the salbutamol monoclonal antibody are prepared by mixing the salbutamol monoclonal antibody with magnetic beads in a mass ratio of 1:(500-600) and dissolving in 2-morpholinoethanesulfonic acid, monohydrate through coupling; the salbutamol monoclonal antibody is prepared by immunizing Balb/c mice by using conjugate of salbutamol hapten and bovine serum albumin as immunogen; the salbutamol hapten is prepared by performing diazo-reaction on salbutamol and aminobenzoic acid and by introducing carboxyl-containing spacers beside phenolic hydroxyl groups. The invention further discloses a sample pretreatment method for separating salbutamol by using the salbutamol immunomagnetic bead separation and enrichment kit. The method has relatively high specificity for salbutamol and is high in recycling rate and accuracy, sample pretreatment steps are simplified, and multiple and massive organic solvents are not used in the sample pretreatment process.

The invention discloses a GaN-based LED epitaxial structure and a production method thereof. The GaN-based LED epitaxial structure sequentially comprises a substrate, a nitride buffering layer positioned on the substrate, an N-type GaN layer positioned on the nitride buffering layer, a multiple-quantum-well layer positioned on the N-type GaN layer, and a P-type GaN layer positioned on the multiple-quantum-well layer. The multiple-quantum-well layer comprises a plurality of quantum well layers, and each quantum well layer comprises an InxGa (1-x) N potential well layer, an AlN/GaN superlattice structure layer and a GaN barrier layer. By the GaN-based LED epitaxial structure, interface quality of quantum wells can be improved, and internal stress can be reduced, so that internal quantum efficiency of the quantum wells is improved.

The present invention provides a montmorillonite/beta molecular sieve composite material and its preparing method. The montmorillonite/beta molecular sieve composite material is prepared by evenly mixing montmorillonite with beta molecular sieve gelatin, then processing home position crystallization, and via filtering, washing and drying. The composite material have structure characteristics of the montmorillonite and the molecular sieve at the same time, the montmorillonite and the molecular sieve are alternative. The synthetic montmorillonite/beta molecular sieve have characteristics of small crystal grain molecular sieve by controlling the synthetic course and the conditions. The preparing method is simple, the easily separating, the molecular sieve composite material has better water-heat stability. The composite material are mainly used for all kinds of catalysts and absorption agents, especially the preparing of hydrogenation catalyst.

The invention discloses a novel trawl net capable of reducing incidental catches, and belongs to the technical field of aquatic product catching. The novel trawl net comprises a netting, a fish attractor, a fish net bag and a shrimp net bag; the end of the left side of the netting is connected with a framework, the fish net bag is connected to the right side of the netting, the shrimp net bag is connected to the lower portion of the fish net bag, the fish net bag is internally provided with at least two sieve plates, and an escaping window is formed in the end of the right side of the fish netbag. By means of the novel trawl net, the incidental catches can be effectively sieved, and discharged to the outside of the netting, and the temporary raising density of the catches is lowered whilecatching of the incidental catches is greatly reduced.

The present invention relates to a spray dust-falling system for city. Said system includes water transfer pipe network, booster pump on the water transfer pipe network and spray nozzle. It is characterized by that the water transfer pipe network is connected with water storage pool, and the above-mentioned spray nozzle is fixed on supporting column.

A dew point apparatus of cold mirror is prepared for forming dew point chamber by coil cover, base body in separation mode, beam splitter, mirror surface and semiconductor-refrigerator; forming heat radiation unit by heat tube radiator and fan; setting DSP fuzzy controller in control unit and connecting bottom of dew point chamber to heat radiation unit.

The invention provides a supported cobalt monatomic catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) enabling urea to be subjected to a thermal polymerization reaction to obtain graphitized carbon nitride; (2) reacting the graphitized carbon nitride obtained in the step (1) with cobalt salt to obtain a cobalt and graphitized carbon nitride compound; and (3) carrying out heat treatment on the compound obtained in the step (2) and hypophosphite to obtain the supported cobalt monatomic catalyst. The preparation method is simple, wide in raw material source and high in yield, and has a large-scale application prospect. The supported cobalt monatomic catalyst is a phosphorus-doped graphitized carbon nitride supported cobalt monatomic catalyst, has the characteristics of adjustable band gap, high catalytic activity and high selectivity, and can realize selective oxidation under photocatalysis with high conversion rate; and the catalyst is especially suitable for converting alcohol compounds into aldehyde compounds or ketone compounds through a photo-oxidation catalytic reaction.

The invention discloses an ultraviolet curing transfer adhesive for a glass substrate. The ultraviolet curing transfer adhesive comprises aliphatic polyurethane acrylate, an acrylate active diluent, a photoinitiator, an acrylate aid and a silane coupling agent. The ultraviolet curing transfer adhesive for a glass substrate, disclosed by the invention, has good mechanical property, wear resistance, solvent resistance and cold/hot impact resistance while the adhesion between the adhesive layer and the substrate is good; and particularly, after water boiling test, the adhesion between the adhesive layer and the substrate is still greater than 4B, and little environmental pollution is caused. The problems that existing ultraviolet curing transfer adhesive has low adhesion and is not resistant to water boiling and solvent are solved; and the ultraviolet curing transfer adhesive disclosed by the invention meets the industry requirements, reduces the production cost of an enterprise and brings profit to the enterprise.

The invention relates to the technical field of biology, in particular to a method for biosynthesizing nano-silver through photoinduction of imperata leaf extract. The method comprises the following steps: 1) picked imperata leaves are cleaned, dried and grinded to powder; ultrapure water is added in the powder for oscillating, extracting and centrifugating to obtain supernatant; and the supernatant is frozen and dried to obtain the imperata leaf extract; and 2) the imperata leaf extract in the step 1) is taken as a reaction matrix; AgNO3 solution is added, so that the concentration of the reaction matrix in obtained mixed solution is 10-50 mg/mL, and the concentration of AgNO3 is 1-3 mM; and nano-silver particles are prepared through reaction under sunlight irradiation or LED lamp irradiation. The biosynthesizing method is safe, environment-friendly, wide in synthetic material source and fast in synthesizing speed, can finish the reaction within 90-120 minutes, and is a green, safe and efficient biosynthesizing method.

The invention relates to a quaternary ammonium salt modified hectorite emulsifier and a method for emulsifying ASA (acetylsalicylic acid) by using the quaternary ammonium salt modified hectorite emulsifier and belongs to the technical field of emulsification of papermaking sizing agents. The emulsifier is composed of independently existing quaternary ammonium salt and hectorite; and the mass ratio of the quaternary ammonium salt to the hectorite is 1: (50-500). According to the quaternary ammonium salt modified hectorite emulsifier, the quaternary ammonium salt has high modification efficiency to hectorite, is small in dosage when stabilizing ASA sizing emulsion and has good emulsion effect on the stable ASA sizing emulsion; the ASA sizing emulsion stabilized by the quaternary ammonium salt modified hectorite emulsifier is good in stability, free of granular aggregation or precipitation or water phase separation after being stood still for 24 hours, is hardly hydrolyzed and is small in sizing performance change after being placed for 3 hours and high in sizing efficiency; and compared with ASA emulsion singly stabilized by hectorite, the ASA emulsion stabilized by the emulsifier has greatly improved sizing efficiency.

The invention discloses a flame-retardant coating fabric high in moisture-penetrability. The flame-retardant coating fabric high in moisture-penetrability comprises a first base coating and a second base coating, wherein the first base coating is obtained by drying a sizing agent which is prepared from the following components in parts by mass: 100 parts of polyurethane resin, 38-42 parts of bromoethane, 19-21 parts of diantimony trioxide, 4.5-5.5 parts of zinc borate, 4-5 parts of a bridging agent, 1.6-2 parts of an accelerant, 1.4-1.6 parts of a washable agent and 9-11 parts of phosphate ester flame-retardant oil. The second base coating is obtained by drying a sizing agent which is prepared from the following components in parts by mass: 100 parts of polyurethane resin, 38-42 parts of bromoethane, 19-21 parts of diantimony trioxide, 4.5-5.5 parts of zinc borate, 4-5 parts of the bridging agent, 1.6-2 parts of the accelerant, 1.4-1.6 parts of the washable agent and 9-11 parts of phosphate ester flame-retardant oil. The flame-retardant coating fabric high in moisture-penetrability is small in smoke generation quantity, free of molten drop, high in flame-retardant effect and highly washable; the flame-retardant substance has a small possibility of hydrolyzing.

The invention discloses a preparation method for a silver cadmium oxide electrical contact. The method comprises the following steps of: forming a pressed blank in a die pressing mode by adopting silver cadmium alloy powder, wherein the relative density of the pressed blank is 65 to 80 percent; treating the formed pressed blank for 1 to 3 hours under the hydrogen atmosphere at the temperature of between 350 and 600 DEG C, putting the treated pressed blank into an oxidation furnace with oxygen pressure of 0.02 to 1.5MPa and temperature of 500 to 750 DEG C, and performing oxidation; for obtaining the silver cadmium oxide electrical contact with high compactness, sintering the internal oxidized blank at the temperature of between 700 and 900 DEG C in the air; and performing hot re-pressing on the blank at the temperature of between 500 and 900 DEG C, and thus obtaining an electrical contact product with relative density of over 99 percent. The silver cadmium oxide particles prepared by the method are fine and uniform in metallographic structure; and the method has the advantages of an internal oxidation process and does not produce a 'depleted oxide bright band'.