176 results about "Morphology control" patented technology

The invention relates to a carbon nitride/titanium dioxide nanosheet array heterojunction photocatalyst and a preparation method, belonging to the technical field of photocatalysis of nanometer materials. The catalyst is prepared through the following steps: with g-C3N4 as a carrier, titanium isopropoxide as a titanium source, diethylenetriamine as a morphology controlling agent and isopropanol as a solvent, performing a solvothermal method so as to prepare a g-C3N4/TiO2 precursor, and carrying out calcination treatment so as to obtain a g-C3N4/TiO2 nanosheet array heterojunction composite photocatalyst for the first time. The heterojunction composite photocatalyst shows pure and significantly-improved photocatalytic hydrogen production activity to g-C3N4 and anatase TiO2 nanosheet mesoporous spheres in a photocatalytic hydrogen production reaction. The preparation method has the advantages of simple and convenient operation, easy control, greenness, environmental protection and good application prospects. The series of catalysts has multilevel structure; and a g-C3N4/TiO2 nanosheet array heterojunction structure is formed through vertical and staggered growth of anatase TiO2 nanosheets with regular shape and uniform size on the surface of g-C3N4. The catalyst has excellent photocatalytic hydrogen production activity, good stability, high repeatability and facilitation large-scale production.

The invention discloses a morphological control method of a metal oxide/carbon (MOx/C) composite material for the negative electrode of a lithium ion battery. The method comprises the following steps: adding metal ions and monodentate ligands with different proportions into a solvent, stirring for a period of time, then adding a multidentate ligand, and heating in a reaction kettle for a period of time to obtain the metal organic framework (MOF) precursor materials with different morphologies; and calcining the precursors in an inert gas atmosphere for a period of time to obtain the MOx/C composite materials with different morphologies. The composite materials disclosed by the invention have relatively high specific surface areas and rich pore structures, and have excellent rate performance and cycling stability as the negative electrode materials of the lithium ion battery. The morphological control method disclosed by the invention is simple to operate, easy to realize large-scale application, and can also be extended to other fields that focus on material morphology control.

The invention belongs to the technical field of zeolite molecular sieve synthesis and relates to a synthesis method of a lamellar ZSM-5 molecular sieve. Morphology control is important in the field of molecular sieve synthesis, in a catalytic reaction, product selectivity, reaction activity and stability of MFI zeolite molecular sieve catalysts with different morphologies have obvious difference because of morphology difference. The synthesis method mainly utilizes a one kettle way to prepare ZSM-5 zeolite, has simple synthesis processes and can be industrialized easily. Through use of an effective additive, product crystallinity and final morphology can be effectively controlled. A sample XRD shows that the product is the ZSM-5 molecular sieve and has good crystallinity. SEM shows that the zeolite has lamellar morphology and can be used for olefin cracking industrial application.

The invention discloses a preparation method of high-reinforcement modified anhydrous calcium sulfate crystal whiskers. The method comprises the following steps that: firstly, limestone powder is added into stirred water to be prepared into calcium salt aqueous emulsion; then, sulfuric acid and crystal modifiers are sequentially added into the stirred water to be prepared into sulfuric acid water solution; next, the calcium salt aqueous emulsion containing 1 mol part of Ca<2+> is added into the sulfuric acid water solution containing 2 mol parts of SO4<2-> with the temperature reaching 100 to 110 DEG C, then, morphology control agents are added, the materials are subjected to stirring and aging for 2 to 3.5 hours under the temperature condition being 110 to 120 DEG C, leaching and washing are carried out, and calcium sulfate hemihydrate crystal whisker wet products are obtained; the calcination drying finally is carried out under the temperature condition higher than 200 DEG C to obtain the anhydrous calcium sulfate crystal whiskers; and then, the surface modification treatment is carried out to finally obtain the high-reinforcement modified anhydrous calcium sulfate crystal whiskers. The preparation method has the advantages that the product quality is high, the cost is low, the preparation process is short, the reaction condition is mild, and in addition, green and environmental-friendly effects can be realized.

Unique abrasive materials that are in situ generated compositions of precipitated silicas and silica gels are provided. Such compositions exhibit different beneficial, particularly simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels. Such a result thus accords the user a dentifrice that effectively cleans tooth surfaces without detrimentally abrading such surfaces. Furthermore, the produced abrasive materials also exhibit very high and desirable brightness properties that permit easy incorporation and utilization within dentifrices for aesthetic purposes. Encompassed within this invention is a unique method for making such gel/precipitated silica composite materials for such a purpose, particularly under high shear conditions, as well as the different materials within the structure ranges described above and dentifrices comprising such.

The invention discloses a synthesizing method, a preparation method and application of a Fe-N-C oxygen reduction catalyst. The synthesizing method comprises the following steps that 1, a carbon-nitrogen precursor, a morphology control agent and soluble ferric salt are added into water, heating and stirring are conducted for reacting, suction filtration is conducted after reacting is complete, and drying is conducted to a solid substance; 2, the solid substance obtained in the step 1 is calcined to obtain a catalyst precursor; 3, the catalyst precursor obtained in the step 2 is treated with acid to obtain the Fe-N-C oxygen reduction catalyst. According to the Fe-N-C compound synthesized through the method, the microstructure is a novel multi-layer-steamed-bread-similar structure formed in the mode that a large quality of nanotubes are wound into laminates, and then the laminates are mutually stacked; in addition, due to the fact that Fe metal particles with active centers are wrapped in the nanotubes, the obtained Fe-N-C oxygen reduction catalyst has the good stability and activity.

The invention relates to a solvothermal method used for preparing LiFePO4 with adjustable particle size and controllable morphology. The prepared LiFePO4 can be used as an anode material for a high-rate lithium ion battery. The method comprises steps that: a soluble phosphorous source and divalent ferrite are dissolved in deionized water; lithium salt is uniformly mixed with a surfactant, a reducing agent, and the like; the two solutions are mixed, such that amorphous LiFePO4 is obtained; the amorphous LiFePO4 is subject to centrifugation; a morphology controlling agent is added to the amorphous LiFePO4, and the solution is stirred until the solution reaches a uniform, clarified and stable state; the solution is added into a reaction vessel, and is subject to a reaction for a certain amount of time under high temperature and high pressure; the material is subject to centrifugal washing and drying, such that LiFePO4 with adjustable morphology and size is obtained.

The invention belongs to the technical field of novel function nanometer material preparation, and discloses a preparation method for a copper nanowire. Reducing agent is added to copper source on the premise that morphology control agent and chemical potential control agent are exist in water solution, and the copper nanowire are obtained after separation and under the condition that reaction is carried out for at least one hour in temperature of 25 DEG C to 100 DEG C, wherein the copper source is one or combination of copper hydroxide and copper oxide, the morphology control agent is one kind or combination of more than two kinds of polyethylene polyamine, the chemical potential control agent is one or combination of sodium hydroxide and potassium hydroxide, and the reducing agent is one or combination of hydrazine hydrate and hydroxylamine. The preparation method for the copper nanowire has the advantages of being simple in technology and device, cheap and easy-getting in raw materials, low in cost, high in productivity, suitable for large-scale industrial production, and the like. Prepared copper nanometers are uniform in diameter, diameters and lengths of the copper nanometers can be controlled through changing concentration of the morphology control agent and concentration and reaction temperature of the copper resource.

The invention relates to the field of photocatalysis materials, in particular to a method for preparing a boron-doped titanium dioxide crystal containing a specific crystal plane. The method comprises the following steps of: loading titanium boride serving as a precursor into a reaction kettle of an acid solution containing different anions; sealing the reaction kettle; putting the reaction kettle into a baking oven for heating; taking a reaction sample out; washing with deionized water and drying to obtain a boron-doped titanium dioxide crystal containing a specific crystal plane in an acid system containing anions; and further thermally treating the boron-doped titanium dioxide crystal under different atmospheres, adjusting the distribution of boron in the crystal, and introducing a newheteroatom. In the invention, the boron-doped titanium dioxide crystal can be directly prepared by taking the titanium boride as the precursor and taking the anions as a morphology control agent, andthe surface of the boron-doped titanium dioxide crystal consists of an identifiable crystal plane, so that effective adjustment and control of the electronic structure of the photocatalysis material are effectively realized, and the defects of poor reaction selectivity and unavailable invisible light activity of the photocatalysis material are overcome.

The invention discloses a preparation method of a yolk-eggshell structured nitrogen-doped carbon-coated Fe3O4@SnO2 magnetic nanometer box, and belongs to the technical field of production of a nanometer material. The preparation method comprises the following steps of firstly, wrapping the surface of a Fe2O3 nanometer cube with a layer of silicon dioxide; secondly, forming a yolk-eggshell structured Fe2O3@SnO2 nanometer box under the effect of potassium stannate trihydrate and urea; and finally, coating dopamine, introducing a carbon source and a nitrogen source, carrying out calcination in an inertia atmosphere to form a conductive carbon layer, and simultaneously converting Fe2O3 to Fe3O4. The instrument equipment adopted by the invention is simple, the preparation cost is low, the operation process is simple and convenient, the required material during the reaction process is low toxic and is not harmful, the stoichiometric ratio of a multi-constituent material can be effectively controlled, and the high-quality yolk-eggshell structured magnetic nanometer material which is uniform in size, uniform in distribution and favorable in morphology control and can be used for industrial production at a large scale is obtained.

The invention relates to a method for preparing a carbon-material-carrying tin dioxide nanosheet composite material, belonging to the technical field of functional composite materials. According to the method, a carbon material, tin dichloride dihydrate and sodium citrate dihydrate are taken as raw materials and are subjected to mixing, stirring, hydrothermal synthesis, solid-liquid separation, cleaning and drying, and then, the morphology-controlled carbon-material-carrying tin dioxide nanosheet composite material is prepared. The method provided by the invention is simple and is convenient in operation; and water is taken as a solvent, so that the production cost is lower, the environment is not polluted, and the popularization and the application are facilitated. The carbon-material-carrying tin dioxide nanosheet composite material prepared by adopting the method provided by the invention can be widely applied to new-energy devices such as lithium ion batteries, solar batteries and supercapacitors, and can also be applicable to the fields of catalyst carriers, information materials and the like.

The invention discloses a high-nickel lithium ion positive electrode material. The molecular formula is LiNi<x>Co<y>Mn<1-x-y-z>M<z>O2, wherein M is a doping element, the lithium ion positive electrodematerial is spherical secondary particle formed by gathering primary particle, and the structure of the lithium ion positive electrode material is a homogeneous-phase structure, a core-shell structure and a concentration gradient structure. The preparation method of the lithium ion positive electrode material comprises the steps of preparing a high-nickel positive electrode material precursor andpreparing the lithium ion secondary battery positive electrode. The precursor of the high-nickel positive electrode material is synthesized by a co-precipitation method, uniform mixing of elements can be facilitated, reaction can be more sufficient by adding the aging process, and morphology control is facilitated; and with the adoption of multi-element co-doping, the stability of a material crystal structure can be improved, the content of a Mn element is reduced, other doping elements are introduced, the lithium and nickel mixed arrangement degree of the high-nickel positive electrode material can be reduced, the orderliness of a layered material is ensured, the structure of the material is stabilized, the discharging specific capacity is improved, so that the energy density of the battery is improved.

The invention discloses a preparation method of a cobalt nickel sulfide/foam nickel super capacitor electrode. According to the method, foam nickel, cobalt nitrate, nickel nitrate and thiocarbamide are used as raw materials; ammonium fluoride is used as an etching agent; polyvinylpyrrolidone is used as a morphology control agent; a hydrothermal reaction is performed in a hydrothermal reaction kettle at 100 to 180 DEG C for 2 to 8h; and nickel cobalt sulfide of an ultra-thin sheet layer-assembled cellular multi-stage structure deposits and grows on a foam nickel substrate, so that an active electrode is formed. The cobalt nickel sulfide electrode prepared by the preparation method provided by the invention can provide high pseudocapacitance, and has high electron and ion conductivity and excellent structure toughness at the same time, so that the specific capacitance and the rate capability of the capacitor can be comprehensively improved.

The invention belongs to the technical field of chemical production, and provides a method and a device for controlling the morphology of boehmite. The method comprises the following steps of: respectively dissolving two analytically pure aluminum salts in deionized water to prepare solutions; adding the two aluminum salt solutions into a hydrothermal reaction kettle according to a certain anion mole ratio, adding a certain amount of precipitant and controlling the filling factor of the mixed liquor in the hydrothermal reaction kettle within 67-80%; sealing the hydrothermal reaction kettle, controlling the hydrothermal temperature within 120-200 DEG C and reacting for 4-24h; centrifugally separating sediment products at a revolving speed of 4000rpm; respectively washing the sediment products by using deionized water and absolute ethyl alcohol; and placing in a vacuum drying oven of 80-100 DEG C to dry for 4-8h, so as to obtain boehmite superfine powder with different morphologies. The preparation of the boehmite superfine powder is finished in liquid phase at once, the raw materials are inexpensive and easy to get, no additive is needed, the morphology control method is simpler and more convenient, the after-treatment process is simple, and the product dispersion is even and the morphology change is rich.

The invention relates to a PtCu electric catalyst for a fuel battery and a preparation method thereof. The method adopts the one-step hydro-thermal synthesis technology, the synthesis method comprises the following steps: dissolving triblock copolymer P123 in the secondary distilled water; adding chloroplatinic acid hexahydrate, cupric chloride and potassium iodide in a P123 solution, stirring, ultrasonically dissolving; transferring the mixed solution to a liner of a polytetrafluoroethylene reaction kettle in 50mL, tightly sealing the reaction kettle, and placing the reaction kettle in a blast drying oven, reacting for 6-12 hours at 120-200 DEG C; naturally cooling to room temperature, centrifuging, washing for three to five times to obtain the PtCu electric catalyst for the fuel battery. The triblock copolymer P123 is simultaneously used as the protection agent and the reducing agent, the potassium iodide is used as the morphology control agent, the obtained PtCu electric catalyst is good in dispersibility, has a regular cubic appearance, and excellent performance of electrically catalyzing and oxidizing methanol, and is a fuel battery catalyst which has excellent development prospects.

The invention provides a preparation method for a BiOCl photocatalyst with a controllable morphology and a crystal face, and belongs to the technical field of environmental chemical engineering photocatalysis water treatment. The preparation method is characterized by comprising the following steps: adding Bi(NO3)3.5H2O into a certain amount of water, ethyl alcohol or a dimethyl formamide solvent, uniformly stirring, then adding a certain amount of chlorination-1-butyl-3-methylimidazole, stirring for 20min for uniform mixing, performing ultrasonic treatment under room temperature for 10-60min, and reacting to generate white precipitate; washing the precipitate by water and ethyl alcohol, and drying the precipitate under the temperature of 60 DEG C to obtain BiOCl photocatalyst powder with different morphologies. According to the preparation method provided by the invention, the BiOCl preparation period is short, and the use of a surfactant is avoided; by control on the solvent, the preparation method for implementing BiOCl crystal surface control (101 and 102) and morphology control (a nano sheet shape, a flower-like structure and an irregular disk shape) can be conveniently realized. The preparation method is completed in the next step under the room temperature, has the advantages of simple process, extremely short preparation period, environment friendliness and the like and is favorable for engineering large-scale preparation. The catalyst has outstanding degrading effects on rhodamine B, methyl orange, quinoline blue and the like by visible light and sunshine and has an actual application prospect.

The invention discloses an environmentally-friendly synthetic method for the metal nanoparticle, and belongs to the field of the nanometer material. The existing ingredients in a microorganism nutrient solution are used as reducing agent, stabilizing agent and morphological control agent to synthetize metal nanometer material in one step. The environmentally-friendly synthetic method for the metal nanoparticle comprises the following steps of: (1) blending a reducing stable morphology control agent solution, and meanwhile, adding sodium chloride or dipotassium phosphate; (2) regulating the pH (potential of hydrogen) value of the solution to 2-13; (3) adding the soluble metal salt water solution of the metal nanoparticle while stirring the solution; and (4) at the temperature of 15-50DEG C, reacting for 5 seconds to 24 hours to obtain the metal nanoparticle. The environmentally-friendly synthetic method for the metal nanoparticle, which is disclosed by the invention, has the moderate reaction condition, short synthesis time and low production cost, the particle diameter of the obtained metal nanoparticle is 1-100nm, the particle diameter of the nanometer material is relatively even, and the morphology of the generated metal nanoparticle can be controlled. Compared with the biosynthesis method, the environmentally-friendly synthetic method for the metal nanoparticle is simpler, efficient and environmentally-friendly.

The invention provides a zinc aluminate nanometer powder and a preparing method thereof. The preparing method includes the steps that 1, soluble aluminum salt and zinc salt are added into a water solution, the mixture is heated to be at the temperature of 40 DEG C to 70 DEG C under stirring, a water bath is carried out for 20 min to 60 min at the constant temperature, and a mixed solution is obtained; 2, a morphology control agent is added into the mixed solution obtained in the step 1, and dissolved under stirring, wherein the concentration of the morphology control agent is 0.01 mol/L to 2 mol/L; 3, urea is added into the mixed solution obtained in the step 2, and the constant temperature of 40 DEG C to 70 DEG C is kept for 1 h to 5 h, wherein the molar ratio of the morphology control agent to the urea is 1:100-1:10; 4, the mixed solution obtained in the step 3 is transferred to a high-pressure reaction vessel, and is reacted for 2 h to 8 h at the temperature of 120 DEG C to 180 DEG C, the obtained product is washed, subjected to suction filtration, dried at the low temperature, and subjected to high-temperature roasting, and the zinc aluminate nanometer powder is obtained. The zinc aluminate nanometer powder prepared with the method is of a fluffy-sea-urchin-shaped structure, and has the high specific surface area and high fluffiness.