38results about How to "Uniform crystal phase" patented technology

The invention discloses a preparation method of iron phosphate for preparing lithium iron phosphate material, and relates to heavy metal phosphate. The steps of the method are as follows: analyticallypure soluble molysite is dissolved in distilled water, thereby being prepared into 0.05 to 5 M water solution, and being added with anionic surface-active agent with the mass being 0.01 to 3 percentof the mass of the molysite, then analytically pure phosphoric acid is added according to the mol ratio of Fe<3+>:PO4<3-> equal to 1:0.8 to 1.2 and stirred, alkaline solution with the concentration of1 to 9 M is slowly added in stirring state, the adding time is more than 1 hour until the Ph value of the solution reaches 6 to 7, the deposited matter of iron phosphate is filtered, the filtered iron phosphate is cleaned for 3 to 5 times with distilled water with the 2 to 5 times weight of the iron phosphate, the iron phosphate is dried in the range of 60 to 90 DEG C under a vacuum condition, and the finished FePO4.2H2O powder is gotten. The iron phosphate product with two crystal water prepared by the invention has high reaction activity, and the performance of the lithium iron phosphate material prepared with the iron phosphate product is superior to the lithium iron phosphate material prepared with the commercial iron phosphate product.

The invention belongs to the technical field of preparation of solid materials and particularly relates to a preparation method of a high-performance cerium-zirconium solid solution material. The preparation method comprises the following steps: uniformly mixing metal cerium salt, metal zirconium salt and a surfactant by adopting a spray charging mode; inducing generation of a precipitation by adjusting the charging speed and using a crystal seed generated in the solution; finally, carrying out a hydrothermal aging and roasting process to obtain a cerium-zirconium composite material. According to the preparation method disclosed by the invention, the formation of the precipitation is induced by using tiny crystal seeds generated in an early-stage solution of the precipitation through the spray charging mode and control over the charging speed, so that the uniformity in a precipitating process is improved, and further the formation of a cerium-zirconium solid solution is promoted. The method has the advantages of simple preparation process and low production cost; the prepared cerium-zirconium solid solution has the characteristics of homogenized structure, small particle size, great specific surface area, good stability and the like; moreover, the high-performance cerium-zirconium solid solution material has excellent oxygen storing / discharging property and is the high-performance cerium-zirconium solid solution material with large-scale production and an industrial application prospect.

The invention discloses a method for synthesizing 1,3-butadiene by using a bismuth molybdate catalyst with a nanosheet structure. According to the method, the bismuth molybdate catalyst with the nano-sheet structure is first prepared, and then the nanosheet catalyst is used for the oxidative dehydrogenation of 1-butene to produce 1,3-butadiene. More specifically, a bismuth salt, a molybdenum saltand deionized water are mixed according to a certain molar ratio, the pH value is adjusted by an alkaline solution, the mixture after full stirring is transferred to a PTFE lined container for hydrothermal reaction, the product is subjected to centrifugal separation, washing, drying and roasting, and then the product is subjected to grinding and sieving to obtain the bismuth molybdate catalyst with the nanosheet structure. Compared with a bismuth molybdate catalyst prepared by the traditional co-precipitation method, the catalyst has the nanosheet-shaped morphology, and exhibits better reaction performance in the reaction.

The invention belongs to the field of inorganic nanometer materials, and discloses a method for preparing a polyhedral iron oxyhydroxide film by a corrosion recrystallization method. This method uses the principle of corrosion recrystallization, adopts the "top-down" reaction mode, and by adjusting the characteristics of the precursor sample and the reaction parameters, it successfully obtains the crystallite with regular shape, uniform size, strong bonding with the substrate, and different crystal planes. Cubic, octahedral, and polyhedral β-FeOOH nanocrystalline films with exposed properties. This method has the advantages of "bottom-up" method with high product purity and no need for separation and purification; at the same time, it inherits the advanced nature of "solution precipitation method" that can prepare catalysts with different shapes by adjusting reaction parameters in the same reaction system. It can be used as a preparation method of a wide range of nanomaterials and provide guidance for the preparation of other nanomaterials.

The invention discloses a cadmium organic framework compound and a preparation method thereof. A chemical formula of the compound is [Cd(L)(H2O)2]n, wherein H2L is 2,5-di(1H-1,2,4-triazolyl)terephthalic acid. The preparation method comprises the following steps: adding the H2L and cadmium nitrate with the mol ratio of 1 to 2 into H2O and DMF (Dimethyl Formamide) with the volume ratio of 4 to 1; after stirring the components at the room temprature for 30min, enabling a mixture to react at 120 DEG C for 72h in a closed reaction kettle, so as to obtain a colorless rhombus-shaped crystal, with the yield of 76 percent. The compound disclosed by the invention has a three-dimensional framework structure; a cadmium ion adopts a six-coordinated octahedral coordination mode. When the solid-state compound is stimulated by light with the wavelength of 320nm, the compound has an emission peak at a the part with the wavelength of 414nm and a CIE chromaticity coordinate is (0.15, 0.0439) and is located in a blue-ray region; the compound can be used as an optical material.

The invention discloses a dicaryon cadmium organic framework complex as well as a preparation method and application thereof. A chemical formula of the complex is [Cd2(Mu3-cpima)(Mu3-Hcpimda)(H2O)]n,wherein H3cpimada is 1,4-benzoyl-2-propyl-1H-imidazole-4,5-dicarboxylic acid, H2cpiama is another ligand generated by the ligand H3cpimda in reaction through decomposition, namely 1,4-benzoyl-2-propyl-1H-imidazole-4-formic acid. The preparation method comprises the following steps: adding 1,4-benzoyl-2-propyl-1H-imidazole-4,5-dicarboxylic acid and cadmium chloride in the molar ratio of 1:2 into H2O and acetonitrile in the volume ratio of 10:2, and carrying out reaction for 72 hours at the temperature of 160 DEG C in a closed reaction kettle, so that colorless bulk crystals are obtained, and yield is 67%. The complex disclosed by the invention has a two-dimensional skeleton structure, and center metal cadmium (II) ions respectively adopt a hexa-coordinate mode and a seven-coordinate mode. When a light with the wavelength of 340nm is used for exciting the solid-state complex, the emission peak of the complex appears at 400nm, CIE color coordinates are (0.24, 0.21) and are located in a blue light region, and the complex can be applied as an optical material.

The invention discloses a method for modifying and dyeing polyester fiber by use of silver-doped nano titanium dioxide disperse dye. The method comprises the following steps of: soaking the polyester fiber in a sodium hydroxide solution for etching; cleaning and drying the etched polyester fiber; preparing a modification and dyeing mixed solution; performing modification and dyeing composition finishing on the polyester fiber after the etching treatment in the first step by use of the modification and dyeing solution; and finally, cleaning and drying the modified polyester fiber. The method disclosed by the invention solves the problems that the polyester fiber prepared by an existing modification method has low photocatalytic activity under visible light, a poor self-cleaning function and non-lasting washing resistance and that the modified polyester fiber or fabric has poor handfeel and air permeability.

The invention belongs to the technical field of solid material preparation, and particularly relates to a method for preparing a nickel-cerium solid solution material through ultrasonic assistance. The method comprises the steps that nickel salt, cerium salt, organic acid and an organic macromolecular structure guide agent sufficiently interact through the ultrasonic assistance in a solvent heat treatment manner; and under a self-assembly effect, a flower-shaped or spherical nickel-cerium solid solution with a uniform crystalline phase is formed. The nickel-cerium solid solution material prepared by the method is lower in nickel content, has the characteristics of high specific surface area, high nickel atom dispersity, small crystal particle size, uniform crystalline phase and the like, has excellent oxidoreduction performance and oxygen storage and release performance, has the oxygen storage quantity of 400-600 [mu]mol O / g, and has good application prospects in the fields of environment catalysis, solid fuel batteries, sensors and the like.

A Raney nickel catalyst used for low-pressure hydrogenation of dinitrotoluenem. The catalyst is characterized by comprising, by mass, 80-90 wt% of nickel, 5-10 wt% of aluminium and 1.65-10 wt% of an auxiliary agent metal, wherein the nickel is in the form of a simple substance, the aluminium is in the form of the simple substance of an oxide and the auxiliary agent metal is in the form of the oxide. The catalyst is low in price and has an excellent performance of catalytic hydrogenation of the dinitrotoluenem (DNT) without an additional solvent and under a low-pressure condition of 1Mpa.

The invention discloses a modifying and dyeing composite finishing method for brocade ammonia swimming wear fabric. The modifying and dyeing composite finishing method is specifically implemented according to the following steps: step 1) performing pretreatment on the brocade ammonia swimming wear fabric by using a sodium hydroxide solution, then sequentially soaking in an ethanol solution, washing with deionized water, and finally drying to obtain the clean brocade ammonia swimming wear fabric; step 2) preparing a composite finishing solution containing tetrabutyl titanate, ethanol, silver nitrate, sodium dodecyl sulfonate, an acid dye and a water repellent agent, namely AG-7620, and performing modifying and dyeing composite finishing on the brocade ammonia swimming wear fabric obtained in the step 1) in a hydrothermal environment; step 3) preparing a washing solution, washing the modified and dyed brocade ammonia swimming wear fabric obtained in the step 2) with the washing solution, and finally drying the modified and dyed brocade ammonia swimming wear fabric. According to the modifying and dyeing composite finishing method for the brocade ammonia swimming wear fabric, disclosed by the invention, the modification and the dyeing can be simultaneously performed on the brocade ammonia swimming wear fabric.