290 results about "Crystal morphology" patented technology

The present invention provides ceramic films and ceramic membranes of high stability, high permeability, and large surface area, the films and membranes comprising mullite having whisker (i.e. needle-like) crystal morphology. The invention also discloses environmentally friendly methods of producing such films and membranes. The applications include, for example, membrane ultra-filtration of gas or liquid fluids, biological assays, cell culture surfaces and catalytic coatings on automotive honeycomb substrates.

The invention discloses a process for preparing acicular, flake nano single crystal magnesia-alumina hydrotalcite Mg6Al2(OH)16C.4H2O, and the prepared Mg6Al2(OH)16CO3.4H2O is used as a flame retardant of power electronic devices. Acicular components comprise 0.06-1.41 mol/L crystal magnesium chloride, 0.02-0.47 mol/L aluminum salt, 0.3-4.5 mol/L sodium hydroxide and 0.094-1.368 mol/L sodium carbonate, and flake components are added with modifier basing on the above components. The invention has the process steps that the crystal magnesium chloride and the sodium hydroxide are firstly dissolved in deionized water and heated and stirred, and then the aluminum salt and sodium carbonate are added into the solution, the deionized water and the sodium hydroxide are added every 20 minutes during reaction, the time of reaction is 0.5-2 hours, and the solution is cooled until room temperature and is washed, filtered and dried. The crystal morphology of the prepared acicular nano single crystal magnesia-alumina hydrotalcite is that the diameter is 10-20 nanometer, the length is 60-130 nanometer, the diameter is 25-80 nanometer, and the length is 200-500 nanometer. The crystal morphology of the flake nano single crystal magnesia-alumina hydrotalcite is that the thickness is 10-20 nanometer, the diameter is 50-100 nanometer, the thickness is 20-30 nanometer, and the diameter is 60-200 nanometer. The process for preparation of the invention has short period and simple process, is prepared at atmospheric pressure, and is suitable for industrial production.

The invention relates to a preparation method of compound inorganic antibacterial powder, which comprises the following steps: preparing aqueous Na2WO4 and Zn(NO3)2 solutions into a ZnWO4 precursor under an ultrasonic condition, wherein the concentrations of both the Na2WO4 solution and the Zn(NO3)2 solution are 0.2mol/L; calcining the precursor in sodium nitrate to obtain a cured product, and sufficiently soaking and washing the product in distilled water; and filtering, and drying to remove remaining molten salt so as to obtain ZnWO4 antibacterial powder. Compared with the simplex ultrasonic chemical preparation method, the ultrasonic molten salt preparation method has the advantages of regular crystal morphology and uniform particles of the ZnWO4 antibacterial powder, can prepare the ZnWO4 antibacterial agent having a particle size of 500nm or so and favorable antibacterial properties. Besides, by the invention, the facts that the high-cost silver antibacterial agent can be replaced, and the prepared antibacterial agent can be used in industries and fields of plastics, fibers, paint and the like are possible to come true.

The invention involves a preparation method of NiMnGa magnetic memory alloy micron-scale particles. The invention uses planetary ball grinder, prepares micron-scale Ni48-55Mn24-30Ga20-25(at.%) magnetic memory alloy particles through controlling size of abrading-ball, ball-material rate, ball grinder rotary speed and ball grinding time and adding proper organic adjuvant, the particle size is controlled less than 100 microns, the particles has complete same phase-change behavior and crystal morphology with body material. The component of prepared NiMnGa magnetic memory alloy micron-scale particles using the invention is uniform, signal martensite phase and iron magnetic properties can be prepared just after short time heat treatment, the art is simple and the preparation time is short. The micron-scale NiMnGa magnetic memory alloy particles can be both raw material for preparing NiMnGa composite and a granular magnetic refrigerating material.

The invention belongs to the field of magnesium alloy material preparation and oil-gas field development and particularly relates to soluble extrusion magnesium alloy and a preparation method thereof. According to a design formula, metal Al, Mg, Zn, Cu and Ni are weighed for smelting and casting, after an obtained cast ingot is processed into a cylindrical shape, heat treatment is conducted, and finally the target alloy is obtained through hot extrusion. The magnesium alloy prepared through the preparation method is good in crystal morphology, high in mechanical strength, soluble in an aqueous solution containing an electrolyte and suitable for machining a packing tool used in the fracturing transformation process of an oil-gas field. The soluble material is used for manufacturing the packing tool for fracturing, the packing tool can dissolve away voluntarily after being used, so that the subsequent flowback and milling procedures are omitted, and thus the construction efficiency is improved.

The invention relates to a chip enzyme-free glucose sensor electrode based on three-dimensional copper oxide nanometer flowers as well as a preparation method and application thereof. In the invention, the nanometer flowers directly grow in situ on the surface of a copper foil; the nanometer flower-based chip enzyme-free glucose sensor electrode is composed of a copper foil substrate and a three-dimensional copper oxide nanometer flower array; and the three-dimensional copper oxide nanometer flowers with diameters of 10-20 microns exist in a crystal morphology and are uniformly and compactly distributed on the surface of the electrode. The preparation method comprises the steps of selecting a copper foil slice with a thickness of 0.2-0.5mm, putting the cleaned and dried copper foil into a KOH solution at a temperature about 30-40 DEG C for 3-9 days, after the reaction is completed, taking out a sample, repeatedly washing by utilizing distilled water and deionized water and drying at a room temperature. The three-dimensional copper oxide nanometer flower-based chip enzyme-free glucose sensor electrode can be applied to electronic equipment for continuously monitoring blood glucose concentration.

The invention discloses a method for preparing a full-silicon DD3R zeolite molecular sieve with a pure phase and uniform crystal morphology and size. The purpose of the invention is to provide the method for preparing the full-silicon DD3R zeolite molecular sieve with the pure phase and uniform crystal morphology and size. The method is simple in process, low in cost, good in repeatability and excellent in product quality. The method for preparing the full-silicon DD3R zeolite molecular sieve comprises the following steps: (1) adding an organic structure directingagent, a silicon source and a mineralizer into deionized water to mix and agitate; (2) adding a crystal seed to a mixing system obtained from the step (1); after mixing, agitating and aging, transferring the mixture into a hydrothermal reaction kettle to crystallize; (3), filtering and washing a sample obtained from the step (2), and obtaining the pure-phase DD3R zeolite molecular sieve with uniform crystal morphology and size after drying and baking the sample. The method has the characteristics that the crystallization time is short, the synthetic energy consumption is low, and the obtained pure-phase DD3R zeolite molecular sieve has excellent quality.

The invention discloses a preparation method for high-purity flaky alumina, belonging to the technical field of preparation of special powder. The preparation method comprises the following steps: with high-purity aluminum isopropoxide with a purity of 99.999%, pure water and isopropanol as main raw materials and ammonium bifluoride or ammonium fluoride as a crystal morphology controlling agent, dissolving the high-purity aluminum isopropoxide in isopropanol to prepare a solution A; preparing a solution B from pure water, isopropanol and ammonium bifluoride; then gradually adding the solution A into the solution B drop by drop at a certain addition speed; carrying out a reaction under the conditions of heating and stirring so as to produce hydrated alumina; and then successively carrying out filtering, drying and roasting so as to obtain the high-purity flaky alumina. The high-purity flaky alumina prepared by using the method has crystal grain thickness of no more than 1.0 [mu]m, a radial size of 5 to 20 [mu]m, a smooth surface, a flaky shape, no agglomeration and crystal twinning, and good dispersibility, and can be used in fields like cosmetics, pearlescent pigment, high-grade coatings and fine ceramics.

The invention discloses a preparation method of a cubic short rod-like 1-oxygen-diamido-3,5-dinitro pyrazine (or 2,6-diamido-3,5-dinitro pyrazine-1-oxide with a code being LLM-105) explosive. According to the method, a solvent-non-solvent impinging jet crystallization mode is adopted; nitric acid (HNO3) is taken as a good solvent of LLM-105; the LLM-105 crystal is rapidly crystallized and separated out in a non-solvent containing a surfactant. By adopting the method disclosed by the invention, the cubic short rod-like LLM-105 crystal with regular crystal morphology can be obtained; the rod length of the LLM-105 crystal is 2-3 microns. The thermal performance of the LLM-105 crystal prepared by the method disclosed by the invention is obviously changed; thermal decomposition peak temperature is reduced to 343 DEG C from 350 DEG C; the LLM-105 crystal prepared by the method disclosed by the invention can be applied to a booster explosive.

The invention relates to alpha-Al2O3 ceramic particles containing lamellar microcrystals as well as a preparation method for the ceramic particles and an application of the ceramic particles. The alpha-Al2O3 ceramic particles comprises magnetoplumbite lamellar crystals and aluminum oxide crystals, and the magnetoplumbite lamellar crystals are inserted in the aluminum oxide crystals in a penetration manner. The specific preparation method comprises the following steps: 1) dispersing low-cost industrial grade pseudo-boehmite to form slurry, then adding aqueous solutions of acid and additives, and stirring uniformly; 2) performing heat treatment on the slurry at 180-240 DEG C for 24-72 hours to obtain gel; 3) drying the gel, and grinding and screening the gel to form semi-finished products with different particle sizes; and 4) slowly heating the semi-finished products to 1,500-1,600 DEG C in a vacuum state, and keeping a target temperature for 2-4 hours to obtain the alpha-Al2O3 ceramic particles containing the lamellar microcrystals. The alpha-Al2O3 ceramic particles containing the lamellar microcrystals are good in toughness and good in primary crystal morphology controllability, and have excellent grinding performance; and the hardness value of the ceramic particles is greater than 20GPa and the ball-milling toughness of the ceramic particles is greater than 76%.

A phosphate-containing mud-resistant polycarboxylate water reducer is provided and has a general chemical formula shown as a formula (I), wherein R1 is -H or -CH3, R2 is -CH2- or -CH2CH2-, R3 is -H, -COOH or -CH2COOH, R4 is -H or an alkali metal ion, and x, y, z, m and n are non-zero integers. The provided polycarboxylate water reducer has higher adsorption capacity than existing polycarboxylate water reducers, can effectively resist sulfates in cement, has greatly improved dispersion capability, and can change crystal morphology formed in the initial period of ettringite, thus improving slump loss resistance. The invention further provides a preparing method of the phosphate-containing mud-resistant polycarboxylate water reducer.

The invention belongs to the technical field of electrolytic copper foil processing and particularly relates to a surface treatment composite additive capable of improving the corrosion resistance of copper foil. Every liter of the aqueous solution of the composite additive contains 1.0-10 g of polyethylene glycol, 0.1-5.0 g of rare-earth salt, 0.1-15 g of sodium dodecyl benzene sulfonate and 0.2-3.0 g of chitosan. The prepared composite additive is good in control performance and high in stability. The composite additive is used during galvanization, and thus the crystal morphology of a coating can be changed. The coating on the surface of the produced copper foil is smooth and uniform, crystals are fine and compact, the hydrochloric acid degradation resistant rate of the copper foil is lower than 3%, and good corrosion resistance is achieved. In addition, the production process is simple and environmentally friendly, the cost is low, waste foil obtained after surface treatment can also be recycled, and the index of the copper foil is not influenced.

The invention discloses a method for regenerating a dental prosthetic material and an acidic amino acid-induced demineralized dental enamel outer enamel prism thereof in situ, and belongs to the technical field of in-situ regeneration of dental enamel outer enamel prisms. The preparation method is as follows: firstly, carrying out surface calcium activation onto a dental enamel surface, i.e., grafting calcium ions; then, forming calcium carbonate stable calcium ions step by step; finally, taking calcium carbonate stable calcium ions as foundation forms to synthesize hydroxyapatite crystals. Amino acid participates in the whole process, concentration of the amino acid added in a two-step process is consistent. The hydroxyapatite crystals deposited on the surface of the demineralized dental enamel are orderly and compact in sequence, and uniform in crystal morphology, so that obvious continued growth tendency of an artificial layer can be seen. The preparation method disclosed by the invention lowers protein extracting cost and harsh restrictions on an application environment, and is wide in prospect. The material prepared by the method disclosed by the invention can be applied to cosmetic dental for filling demineralization gaps, also can be used for repairing early-stage enamel demineralization, and can be used as a combined material for bottom pulp capping pit and fissure sealing, and the like.

The invention discloses a method for preparing an ordered porous energetic crystal material. The method comprises the following steps of: dissolving a certain amount of energetic materials in a good solvent at room temperature; adding a certain amount of crystal morphology control agents into the solution in the previous step, stirring, dissolving, and slowly adding the solution in the previous step into a poor solvent of the energetic materials and the crystal morphology control agents under the magnetic stirring conditions; continuously stirring the solution in the previous step for a certain time, filtering, and obtaining a composite material of the energetic materials and the crystal morphology control agents; adding the obtained composite material into the solvent, wherein the solvent is a poor solvent of the energetic materials and a good solvent of the crystal morphology control agents; repeatedly washing and removing the crystal morphology control agents; and drying to obtain pure ordered porous energetic crystal material. The preparation method is simple in process flow and mild in reaction conditions and suitable for various energetic materials, the reaction conditions are easy to control, and the prepared ordered porous energetic crystal material has the purity of over 99.5 percent.

The invention discloses a preparation method for silicone-oil-based magnetic liquid. The preparation method for the silicone-oil-based magnetic liquid is mainly characterized in that 1, Fe3O4 is prepared with a coprecipitation method, and through comparison of physicochemical properties of Fe3O4, a ferric oxide crystal with good crystal morphology and magnetic performance is used for following decoration; 2, the surface of the ferric oxide crystal is coated with a SiO2 shell through a Stober method; 3, ferrite nanoparticles of a shell-core structure are obtained through the Fe3O4 magnetic particles covered by SiO2 and spread in silicone oil base liquid, and then the silicone-oil-based magnetic liquid is obtained. The obtained magnetic liquid can resist to high temperature and is high in saturation magnetization intensity, good in seal performance, high in pressure resisting capacity and long in sealing life.

The invention discloses a morphology improvement method of LLM-105 explosives on the basis of a crystal-form modifying agent. The morphology improvement method comprises the following steps of: firstly adding the LLM-105 explosives into a recrystallization solvent to obtain saturated solution of the LLM-105 explosives under the temperature of 20-150 DEG C, then adding one or more in a ketone-type crystal-form modifying agent, an acid-type crystal-form modifying agent, an amide-type crystal-form modifying agent, a polymer-type crystal-form modifying agent and an ion-liquid-type crystal-form modifying agent into the saturated solution of the LLM-105 explosives and stirring to be uniform; and finally, adopting a solvent-out crystallization method to obtain LLM-105 crystals. The morphology improvement method disclosed by the invention has the advantages that the crystal morphology of the LLM-105 explosives can be effectively improved; the prepared crystal of the LLM-105 explosives with regular morphology such as a rod shape, a needle shape and a block shape is prepared and obtained; the preparation method is simple in process route, is moderate in reaction condition and good in safety; and all the solvents can be recovered, so that environmental pollution can not be caused and the suitability for batch production is achieved.

The present invention also relates to a method for preparing metalloaluminophosphate (MeAPO) molecular sieve said method comprising : a) forming a reaction mixture containing a texture influencing agent (TIA), an organic templating agent (TEMP), at least a reactive inorganic source of MeO2 insoluble in the TIA, reactive sources of Al2O 3 and P2O5, b) crystallizing the above reaction mixture thus formed until crystals of the metalloaluminophosphate are formed, c) recovering a solid reaction product, d) washing it with water to remove the TIA and e) calcinating it to remove the organic template.In a usual embodiment said reaction mixture has a composition expressed in terms of molar oxide ratios of: TEMP/Al2O3=0.3-5, more desirable 0.5-2 MeO2/Al2O3= 0.005-2.0, more desirable 0.022-0.8 P2O5/Al2O3=0.5-2, more desirable 0.8-1.2 TIA/Al2O3=3-30, more desirable 6-20. In a usual embodiment the metalloaluminophosphate (MeAPO) molecular sieves made with the above method have a lamellar crystal morphology having an empirical chemical composition on an anhydrous basis, after synthesis and calcination, expressed by the formula HxMeyAlzPkO2 wherein, y+z+k=1, x<=y, y has a value ranging from 0.0008 to 0.4 and more desirable from 0.005 to 0.18, z has a value ranging from 0.25 to 0.67 and more desirable from 0.38 to 0.55, k has a value ranging from 0.2 to 0.67 and more desirable from 0.36 to 0.54, said molecular sieve having predominantly a plate crystal morphology. In an advantageous embodiment the MeAPO made by the method of the invention have essentially a structure CHA or AEI or a mixture thereof. Preferably they have essentially the structure SAPO 18 or SAPO 34 or a mixture thereof. The present invention also relates to catalysts consisting of the above MeAPO molecular sieves madeby the method of the invention or comprising the above MeAPO molecular sieves made by the method of the invention.

A preparation method for yttrium gadolinium europium oxide red fluorescent powder applicable to a 3D PDP (Plasma Display Panel) comprises the steps as follows: a rare earth oxalate coprecipitation body is prepared by adopting a coprecipitation method, rare earth metal oxide is balanced and dissolved in nitric acid or chlorhydric acid to form a rare earth metal salt solution; an oxalic acid solution or a carbonate solution is prepared and added into the rare earth metal salt solution to obtain rare earth metal oxalate or a carbonate precipitate; the carbonate precipitate is filtered and isolated, dried and burned to obtain a rare earth oxide coprecipitation body; the coprecipitation body is oxidized and burned to form a yttrium gadolinium europium oxide red fluorescent powder burned body; the rare earth oxide coprecipitation body is added with a cosolvent and is loaded in an aluminum oxide crucible and is burned under high temperature in an oxidizing furnace; after burned, the rare earth oxide coprecipitation body is shattered after burning to obtain a yttrium gadolinium europium finished product; and finally, the yttrium gadolinium europium oxide red fluorescent powder is obtained according to a downstream treatment process. The fluorescent powder prepared according to the method has the advantages of high lighting brightness, good color purity, complete crystal morphology, small powder center particle size, simple manufacturing method and low production cost, and is suitable for industrial production.

The invention relates to a preparation method of a Ni-Co-Mn lithium ion battery electrode material and belongs to the field of a new energy technology. According to the invention, a mixed solution of sodium hydroxide and ammonia water is used as a precipitating agent, nickel sulfate, cobalt sulfate and manganese sulfate are used as metal salts, and a crystallization precipitation reaction is controlled to prepare a nickel-cobalt-manganese mixed hydroxide. Before adding a reaction solution drop by drop, a certain amount of polyvinylpyrrolidone-K30 is dissolved in a base solution to be used as a crystal-growing controlling agent; and then, under the protection of the inert gas nitrogen, crystal growth process of a resultant is controlled through synergism of ultrasonic cavatition and dispersion and the crystal-growing controlling agent. Then, the crystal morphology is controlled. The whole reaction process is carried out at normal pressure and at the temperature of less than 100 DEG C, and the reaction condition is mild. The coprecipitation product is a composite hydroxide nanosheet with a brucite structure, and no other impure phases are formed. The size of the nanosheet is 100-400 nm, and thickness is about 5-10 nm.

The invention provides a method for preparing cobaltosic oxide with large grain size and high safety, comprising the following steps: preparing the raw material cobalt and a precipitant into cobalt solution and precipitant solution with deionized water, adding the cobalt solution and the precipitant solution which are prepared to certain concentration to a reaction vessel by the charging methods including cocurrent charging according to certain molar ratio, preparing the cobalt salt precursor by controlling the reaction temperature, charging speed, PH value and stirring speed, washing and dehydrating the precursor, directly putting the water-containing filter cake into a pot, spheroidizing and calcining the pot at high temperature, carrying out mechanical grinding, grading and activating, controlling the grain size and the crystal morphology and finally removing the magnetic metal foreign bodies, thus finally obtaining the high quality battery grade cobaltosic oxide. The method is simple in process, easy to operate, low in cost, energy-saving, environment-friendly and suitable for industrial production. The prepared cobaltosic oxide looks like spheroid and has large grain size, good powder flowability and uniform granularity.

The present invention relates to metalloaluminophosphate (MeAPO) molecular sieve with lamellar crystal morphology having an empirical chemical composition on an anhydrous basis, after synthesis and calcination, expressed by the formula HxMeyAlzPkO2 wherein, y+z+k=1 and x<=y, said molecular sieve having predominantly a plate crystal morphology in which the width (W) and the thickness (T) are such as : W/T is >= 10 and advantageously ranges from 10 to 100. In a preferred embodiment T is <= 0.15 mum, more desirably <=0.10 mum, more desirably <=0.08 mum, advantageously ranges from 0.01 to 0.07 mumand preferably from 0.04 to 0.07 mum. The above metalloaluminophosphate (MeAPO) molecular sieve can be made by a method which comprises : a) forming a reaction mixture containing a texture influencing agent (TIA), an organic templating agent (TEMP), at least a reactive inorganic source of MeO2 insoluble in the TIA, reactive sources of Al2O3 and P2O5, b) crystallizing the above reaction mixture thus formed until crystals of the metalloaluminophosphate are formed, c) recovering a solid reaction product, d) washing it with water to remove the TIA and e) calcinating it to remove the organic template. In an advantageous embodiment the MeAPO of the invention have essentially a structure CHA or AEI or a mixture thereof. Preferably they have essentially the structure SAPO 18 or SAPO 34 or a mixture thereof. The present invention also relates to catalysts consisting of the above MeAPO molecular sieves or comprising the above MeAPO molecular sieves. The present invention also relates to a process for making an olefin product from an oxygen-containing, halogenide-containing or sulphur-containing feedstock wherein said oxygen-containing, halogenide-containing or sulphur-containing feedstock is contacted with the above catalyst under conditions effective to convert the oxygen-containing, halogenide-containing or sulphur-containing feedstock to olefin products.