551 results about "SOLUTION/DROPS" patented technology

The invention belongs to the technical field of preparation of semiconductor nanomaterials and discloses a single-size CsPbX3 perovskite nanocrystalline preparation method. The method includes: adding cesium carboxylate solution into N2 protected lead bromide solution to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline; scattering the single-size CsPbX3 perovskite nanocrystalline into normal hexane, and gradually adding lead chloride solution or lead iodide solution drop by drop to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline. The single-size CsPbX3 perovskite nanocrystalline preparation method has the advantages of simplicity in operation, easiness in size adjustment of products, component controllability and the like.

The invention relates to a temperature and pH valve sensitive nano microgel and a preparation method thereof. Structure formula of the microgel and copolymer thereof is shown above, wherein temperature sensitive monomer M is amide group containing compound, pH sensitive monomer N is carboxyl group containing compound, crosslinking agent O is acryloyl group containing compound, and mole ratio of amount of the three groups is 50-90 to 40-5 to 10-5. Degree of polymerization Z is 10-500. The method of preparing the microgel under condition of adding no emulsifier includes: employing specific dropping technique and nonsoap emulsion polymerization method, composing reactant water solution by M, N, O and water solvent according proportion, timed adding the reactant water solution to initiator water solution drop by drop, after ruleless copolymerizing and purifying, obtaining the double sensitive nano microgel with equal particle diameter of 40-300 nm and high stability. The microgel is easy to store, convenient for use and widely be used for medicament carrier and coating field. Advantages of the preparing method are: range of applicability is wide, technique is simple, and preparation can be large-scale production.

The invention relates to a preparation method for a grain size controllable monodisperse polyvinyl alcohol gel microsphere. The preparation method comprises the following steps: preparing a disperse phase solution and a continuous phase solution; controlling the flowing speed, flow and viscosity of the disperse phase and the continuous phase; obtaining polyvinyl alcohol solution drops in different grain sizes and in uniform diameter size after converging the disperse phase with the continuous phase; and solidifying the drops, thereby obtaining the grain size controllable monodisperse polyvinyl alcohol gel microspheres. The invention also relates to a preparation device for the grain size controllable monodisperse polyvinyl alcohol gel microsphere and the prepared monodisperse polyvinyl alcohol gel microsphere. The microsphere prepared according to the invention has a better surface morphology and a grain size range of 50-600 microns. The preparation device is convenient to assemble and disassemble; the size controllable preparation for a monodisperse polyacrylamide microsphere is realized by changing the size of a capillary tube or controlling the flowing speed or viscosity of the disperse phase and the continuous phase; and the grain size distribution coefficient CV is less than 5%.

The invention relates to a method for preparing a spherical nanometer sliver powder. A method for preparing a spherical nanometer sliver powder is characterized in that the invention includes the following steps: 1) spraying and pyrolyzing: a, dissolving silver nitrate with one of the three: {1}magnesium nitrate, {2}nickel nitrate, {3}copper nitrate into water to prepare into a water liquor with a consistency of 10 to 40wt percent; the mol ratio of magnesium ion, nickel ion or copper ion in the liquor is 0.05 to 1 :4; then spraying for pyrogenation; b, under the existence of a dispersant and protecting agent, adding into a non-water ethanol to disperse to acquire a mixture; 2) preparing the spherical nanometer sliver powder: a, dripping acid liquor into the mixture and adjusting a PH value between 3 to 5 to acquire a suspension containing the spherical nanometer sliver powder; b, pumping filtration, washing and drying to acquire the spherical nanometer sliver powder. The preparing method is simple and easy to be controlled, has no pollution and low cost, is suitable for industrialization scale production. The prepared spherical nanometer sliver powder belongs to the nanometer grade and the powder has uniform distribution of the grain diameter, regular shape and high yield.

The invention discloses a method for synthesizing a spherical gradient lithium-rich anode material, which comprises the following steps of: adding deionized water into MnSO4 and [Ni0.4Co0.2Mn0.4](OH)2 in a molar ratio of x:1-x to form suspension, and dripping 0.025 to 0.1mol/L NaCO3 solution into the suspension in a 60 DEG C water bath to form a compact manganese carbonate precipitate layer; filtering, washing, and drying at the temperature of between 80 and 120 DEG C; and uniformly mixing precursor particles and lithium hydroxide in a molar ratio of 1:1.15-1.45, performing heat treatment in air at the temperature of between 400 and 500 DEG C for 3 to 5 hours, raising the temperature for 22 to 32 hours, and sintering at the temperature of between 750 and 900 DEG C for 12 to 15 hours. The material synthesized by the method has certain Mn concentration gradient, improves the tap density of lithium-rich materials, has high cyclical stability and specific capacity, and keeps high rate performance.

A method for detecting chemical reactions uses a nanocalorimeter having a substrate including thermal isolation capability residing on the substrate, thermal equilibration regions residing within the thermal isolation capability, and thermal measurement capability residing within each of the thermal equilibration regions. The thermal measurement device is connected to detection electronics. The method includes depositing drops of potentially reactive chemical solutions within the thermal equilibration region. These potentially reactive solution drops are merged through the use of drop merging electrodes residing within the thermal isolation region. The thermal change occurring within the merged solution drops is then measured with the detection electronics.

The invention discloses an aluminum salt lithium adsorbent with the molecular formula of LiCl.aAl(OH)3.nH2O, wherein a is 2-5 and n is 0.5-10. The invention also discloses a preparation method of thealuminum salt lithium adsorbent, wherein the preparation method comprises the following steps: mixing an aluminum salt and a lithium salt, then dissolving into deionized water, fully mixing evenly with ultrasound, and then dropwise adding the mixed solution into an alkali solution, or dropwise adding an alkali solution into the mixed solution, or dropwise adding the mixed solution and an alkali solution into a reaction kettle in a manner of parallel flow; and controlling the pH, aging, carrying out hydrothermal reaction, filtering, washing, vacuum-drying, washing with water, and drying to obtain the aluminum salt lithium adsorbent. The invention also discloses an application of the aluminum salt lithium adsorbent in adsorbing lithium in a lithium-containing solution. The prepared aluminumsalt lithium adsorbent has the advantages of stable property, large adsorption capacity, good repeatability and high selectivity.

The invention discloses a composite abrasive grain in a grain/alumina core-shell structure and a preparation method and the application of the composite abrasive grain. An inner core of the composite abrasive grain is selected from diamond, carbide and the like serving as abrasive grains, and an outer shell of the composite abrasive grain is an alumina-coated layer. The preparation method includes: firstly, adding pretreated powder into buffer solution of a certain pH (potential of hydrogen) value, ultrasonically dispersing for 1h, and heating to 50-80 DEG C; secondly, preparing a coating precursor into 0.05-0.4mol/L solution, dripping the solution drop by drop into the buffer solution, violently stirring and keeping the pH value constant; and finally, separating reactants, drying for 24h at 120 DEG C, and performing heat treatment at 300-550 DEG C for more than one hour to obtain the composite abrasive grain in the grain/alumina core-shell structure. Holding power of an abrasive tool base to abrasive grains can be improved to effectively solve the problem of shedding of the abrasive grains, utilization rate of the abrasive grains is increased, the service life of an abrasive tool is prolonged, and uniformity in distribution of the abrasive grains can be remarkably improved.

The invention especially relates to a Raman probe using a gold nanosol as a substrate for detection of mercury ions and a preparation method thereof, which belongs to the technical field of Raman spectrum detection. The preparation method comprises the following steps: adding secondary deionized water into a nano-silver dispersion liquid with phytic acid micelle as a protective agent, carrying out stirring, heating to a temperature of 40 to 60 DEG C, adding a perchloroauric acid solution drop by drop, carrying out stirring for 10 to 20 min, then adding trisodium citrate drop by drop and carrying out stirring for 10 to 20 min and cooling so as to prepare the gold nanosol; and adding crystal violet into the prepared gold nanosol and carrying out uniform mixing. The preparation method for the Raman probe is simple and convenient and needs short preparation time. A gold nanoparticle in the Raman probe has good stability; and the Raman probe has the advantages of capacity of rapid detection of mercury, high sensitivity, good selectivity and a mercury ion detection limit of 0.5*10<-12> mol/L.

The invention discloses a copper nanowire and a preparation method of the copper nanowire. The method comprises the steps that (1) a copper salt solution is added into an alkali solution, the two solutions are mixed, and the concentration of copper ions in the mixed solution ranges from 1*10<-7>mol/L to 1*10<-5>mol/L; (2) a mixed solution of a reducing agent and a dispersing agent is prepared and added into the mixed solution obtained in the step (1); (3) the copper salt solution is dropwise added into the solution obtained in the step (2) under the conditions of magnetic stirring or ultrasonic dispersing, and reaction is conducted for 0.5-6 hours at the temperature of 40-90 DEG C; (4) products obtained in the step (3) are centrifugally separated and washed, and then the copper nanowire is obtained. The copper nanowire obtained based on the preparation method has the good dispersity and inoxidizability, the particle sizes of the obtained products are uniform, the length of the prepared copper nanowire ranges from 3 micrometers to 15 micrometers, the diameter of the prepared copper nanowire ranges from 20nm to 100nm, and the maximum square resistance value can reach 10.1 ohm per square.

The invention provides an MXene-polyaniline composite material and a preparation method thereof, relates to a preparation method of the MXene-polyaniline composite material and aims to solve the technical problem of poor wave absorbing performance of the conventional two-dimensional transition metal carbide MXene. The MXene-polyaniline composite material comprises laminated two-dimensional transition metal carbide and a polyaniline shell coating the surface of the two-dimensional transition metal carbide. The preparation method comprises the following steps: aniline is added to water and stirred, an aniline/water dispersion liquid is obtained, the pH value is regulated to 1.5-2, and a hydrochloride solution of aniline is obtained; the hydrochloride solution of aniline is added to the water dispersion liquid of the two-dimensional transition metal carbide and is stirred and mixed at a low temperature, and an MXene-aniline mixed solution is obtained; an ammonium persulfate solution is added dropwise to the MXene-aniline mixed solution, the mixture is subjected to a stirring reaction at a low temperature, a product is washed and dried, and the MXene-polyaniline composite material is obtained. The MXene-polyaniline composite material can be applied to the field of wave absorption.

The invention discloses a fluorosilicone-modified polyacrylate emulsion as well as a preparing method and an application thereof. The preparing method comprises the following steps: first, mixing deionized water, NaHCO3, an emulsifying agent and an initiator solution, stirring, heating, dropwise adding part of core monomers and reacting; then, beginning slowly dropwise adding the rest of core monomers, and after dropwise adding all of the core monomers, reacting to prepare a seed emulsion; then, dropwise adding shell monomers and the rest of initiator solution into the seed emulsion, controlling reaction temperature at 78-82DEG C, filtering after reaction, discharging, and synthesizing a fluorosilicone-modified nanometer acrylic emulsion with a soft-core and hard-shell structure; and adding a protective colloid into the fluorosilicone-modified core-shell emulsion to prepare a spray-dried pre-emulsion and obtain redispersible rubber powder. Compared with common redispersible rubber powder, the redispersible rubber powder has an excellent water resisting property and can be widely applied to the building fields of outer wall paints, dry-mixed mortar and the like. When used for a building paint and mortar, the product can endow the building paint and the mortar with excellent water retention, weather fastness and constructability.

The invention relates to a preparation method of a high efficiency controllable polycarboxylic acids series cement grinding aid, which comprises the following steps: mixing nonsaturated polyether, nonsaturated sulfonic acid, unsaturated carboxylic acid, a RAFT chain transferring agent and absolute ethanol, adding an emulsifier aqueous solution, uniformly stirring and mixing to prepare an emulsion A; blending an initiator and water to obtain a solution B; under the condition that nitrogen is introduced in the emulsion A, heating to certain temperature and adding the solution B drop by drop, adjusting a flowmeter by finishing dropping after 1.0-2.5 hours, continuously reacting for 10-15 hours; after the reaction is finished, adding a sodium hydroxide solution with mass fraction of 30% and neutralizing to obtain the pH value between 6.5 and 7.5, adding triethanolamine which accounts for 3-7% of total mass of a reaction system in the solution drop by drop, and uniformly stirring to obtain the polycarboxylic acids series grinding aid product. The preparation principle is RAFT controllable/active free radical emulsion polymerization. The polycarboxylic acids series cement grinding aid has the advantages of low effective mixing amount and stable applicability, and has substantial effects for improving and enhancing the cement grinding aiding and cement physical properties.

The invention relates to an in-situ preparation method for a functional nullvalent nanometer iron/polyelectrolyte composite fibrofelt. The method comprises the following steps: (1) preparing polyelectrolyte mixed solution with concentration between 7 and 12 percent by polyacrylic acid PAA, and preparing a nanometer fibrofelt according to a principle of electrostatic spinning; (2) carrying out heat treatment on the nanometer fibrofelt to prepare a water-fast polyelectrolyte fibrofelt; (3) preparing soluble iron salt solution, and preparing reducing agent solution with concentration 4 to 6 times of the iron salt solution; (4) dipping the (2) in the iron salt solution; (5) rinsing; (6) dripping the reducing agent solution onto the complex iron ion fibrofelt; (7) rinsing by deionized water; (8) drying and storing. In the fibrofelt prepared by the method, nanometer iron particles are dispersed evenly without aggregation phenomenon, and the fibrofelt can effectively fix nanometer iron particles, thereby ensuring effective recycle of the nanometer iron particles in practical application without secondary pollution.

The invention discloses a method for preparing waste water processing materials of organic-inorganic composite bentonite which comprises, (1) disintegrating the alta-mud, passing through 100 mesh sieve, charging into the solution of cationic surface active agent, stiring 1-2 hours in water-bath, (2) charging AlCl3 solution into the suspending liquid, stirring 5-10 minutes, (3) while water-bath stirring, charging NaOH or Na2CO3 solutions into the suspending liquid, stewing for over 10 hrs at room temperature, (4) multitime washing, filtering, drying and grinding.

The present invention relates to nanometer fiber-shaped manganese dioxide borne carbon aerogel, a method for producing the aerogel, and an application of the aerogel. The method employs a coprecipitation method, i.e., carbon aerogel grains are dipped in potassium permanganate solution, and manganese acetate solution is added into the potassium permanganate solution drop by drop, then, the precipitate is filtered, washed, and dried. In the resulting nanometer fiber-shaped manganese dioxide borne carbon aerogel, the carbon aerogel is in a three-dimensional mesh structure formed by nanometer grains bonded together; the manganese dioxide in uniform nanometer fiber-shaped distribution; the pore size of the carbon aerogel is 20-30nm; the diameter of the fiber-shaped manganese dioxide is about 5-25nm; wherein, manganese dioxide accounts for 20-50 percent of the total mass. The method utilizes both the high specific surface area, high porosity, and good electrical conductivity features of carbon aerogel and the high specific surface area and high reactivity features of the manganese dioxide in nanometer-level distribution. The nanometer fiber-shaped manganese dioxide borne carbon aerogel can be used in environmental protection and energy domains, such as organic wastewater treatment by three-dimensional electric catalytic oxidation, and manufacturing of electrode materials for super capacitors.

A crucible is formed of a cylindrical body member and a disk-shaped nozzle member fitted to the bottom portion of the body member, and the nozzle member is provided with a nozzle hole for discharging out a semiconductor molten solution dropwise therethrough. The semiconductor molten solution drops discharged out of the crucible through the nozzle hole are cooled and solidified during falling to become semiconductor grains. Silicon grains having high crystal quality can be manufactured at low cost.

The invention discloses a Pt/ZIF-67 composite used for catalyzing hydrolysis of ammonia borane for hydrogen production. The Pt/ZIF-67 composite is prepared by mixing chloroplatinic acid with a metal organic framework ZIF-67 and then carrying out one-step reduction. The structure of the Pt/ZIF-67 composite retains the frame structure of ZIF-67; the average size of Pt nanoparticles is 1-2 nm, the Ptnanoparticles are uniformly distributed, and no obvious Pt metal characteristic diffraction peak occurs according to XRD detection results. A preparation method comprises the following steps: step 1)preparation and activation of the ZIF-67; and step 2) loading of the Pt nanoparticles: adding the activated ZIF-67 into water for ultrasonic dispersion, adding chloroplatinic acid, and then adding anaqueous NaBH4 solution drop by drop, and subjecting a product to filtering, washing and drying. As the Pt/ZIF-67 composite is applied to catalysis of the hydrolysis of ammonia borane for hydrogen production, the turn over frequency (TOF) of a reaction rate reaches 70-100 mol H2 min<-1> Pt mol<-1>, and activation energy is 30-40 kJ mol<-1>. The synergistic effect of the ZIF-67 and the Pt nanoparticles brings in better catalytic performance. Therefore, the Pt/ZIF-67 composite has good application prospects in the field of hydrogen production.

The invention discloses a preparation method of a silver-supported titanium dioxide inorganic antiseptic. The method comprises the following steps: sequentially adding sodium hydroxide and ammonia water into a silver salt solution in a dropwise manner to prepare a Tollen's reagent with a certain concentration, controlling the pH value, adding the Tollen's reagent solution into a certain amount of titanium dioxide powder in a dropwise manner through an incipient wetness process, and continuously vibrating to make the powder uniformly wetted, carrying out room temperature drying, and reducing to obtain the silver-supported titanium dioxide inorganic antiseptic. The method has the advantages of simple operation, environmental protection, effective prevention of the agglomeration growth of silver particles in the subsequent processing through inducing the formation of strong interaction between diammine silver ions and the surface of titanium dioxide by adjusting the hydroxy charges on the surface of titanium dioxide via adjusting the pH value, effective guarantee of the high dispersion of the silver particles on the surface of titanium dioxide, and improvement of the antibacterial properties of silver-supported titanium dioxide inorganic antibacterial materials.

The invention relates to a waterborne acrylic macromolecular compound and salts thereof, as well as preparation methods and applications thereof. The method comprises the following steps of: dissolving hydrophilic acrylic monomers containing amino, acrylic monomers containing hydroxyl, acrylic monomers containing quaternary ammonium salts and acrylic monomers containing carboxyl in water, then adding a water-soluble azo compound as an initiator, and dropwise adding the monomer hybrid solution containing the initiator to water or alcohol-water solution for copolymerization reaction. Stain-proof paints prepared by using metal salts of the waterborne acrylic macromolecular compound can effectively prevent adhesion of fouling organism in seawater, and have the advantage of being environment-friendly.

The invention discloses a preparation method for low-agglomeration antioxidant copper nanoparticle powder. The preparation method for the low-agglomeration antioxidant copper nanoparticle powder comprises the following steps of preparation: preparing copper salt solution and reductant-dispersant mixed liquor; reaction: dipping the copper salt solution into the reductant-dispersant mixed liquor, regulating the pH (potential of hydrogen) value to 10-13, keeping reaction at the temperature of 70-75DEG C under the ultrasonic oscillating condition until the reaction is finished, and standing to obtain a secondary precipitate; primary washing and filtering: obtaining the secondary precipitate; ultrasonic processing: adding surface protectant into the secondary precipitate, and standing after ultrasonic oscillating processing to obtain third precipitate; secondary washing and filtering: obtaining fourth precipitate; pre-drying: carrying out vacuum drying to the fourth precipitate to obtain copper powder; drying: adding NH4HCO3 into the obtained copper powder to be evenly mixed, putting the mixed copper powder under the flowing nitrogen atmosphere, and drying at the temperature of 70-80DEG C to obtain the copper nanoparticle powder. According to the preparation method for the low-agglomeration antioxidant copper nanoparticle powder, which is disclosed by the invention, the charging sequence is changed, ultrasonic vibration stirring is adopted, NH4HCO3 is added, and therefore the copper nanoparticle powder can be effectively prevented from being agglomerated and oxidized.