147 results about "Crystal habit" patented technology

It is an object of the present invention to provide a wafer release method capable of releasing a wafer safely, simply and certainly and improving a wafer releasing rate, a wafer release apparatus and a wafer release transfer machine using the wafer release apparatus. A wafer release method of the present invention comprises the steps of: pressing the uppermost wafer along an axis direction (L-L′) shifted by an angle in the range of from 15 to 75 degrees from a crystal habit line axis (A-A′) or (B-B′) of the uppermost wafer clockwise or counterclockwise; bending upwardly the peripheral portion of the uppermost wafer so as to cause a bending stress in the uppermost wafer in the axis direction (L-L′) shifted by the angle; blowing a fluid into a clearance between the lower surface of the uppermost wafer and the upper surface of the lower wafer adjacent thereto; and raising the uppermost wafer for releasing.

A method for preparing a multi-component semiconductor single crystal, the process steps are: (1) cleaning a crucible, (2) charging and degassing and sealing, (3) crystal growth, and (4) annealing and cooling. The single crystal growth device matched with this method includes a movable lower furnace heater and a single crystal growth furnace with an auxiliary heater in the middle, which can flexibly adjust the temperature field in the crystallization temperature gradient area according to the crystallization habit of the multi-component compound, and obtain The narrow temperature zone and large temperature gradient crystallization temperature field distribution required for the growth of compound single crystals maintain the stability of the solid-liquid interface and realize the flat interface growth of single crystals. Using the growth device, various multi-element compound semiconductor single crystals with complete appearance and good crystallization performance can be successfully grown by adopting the crucible descending method.

Embodiments of the invention generally provide compositions of crystalline zeolite materials with tailored crystal habits and the methods for forming such crystalline zeolite materials. The methods for forming the crystalline zeolite materials include binding one or more zeolite growth modifiers (ZGMs) to the surface of a zeolite crystal, which results in the modification of crystal growth rates along different crystallographic directions, leading to the formation of zeolites having a tailored crystal habit. The improved properties enabled by the tailored crystal habit include a minimized crystal thickness, a shortened internal diffusion pathlength, and a greater step density as compared to a zeolite having the native crystal habit prepared by traditional processes. The tailored crystal habit provides the crystalline zeolite materials with an aspect ratio of about 4 or greater and crystal surfaces having a step density of about 25 steps/μm² or greater.

The invention relates to the field of medicinal chemistry, in particular to an Uloric crystal and a preparation method thereof. The Uloric crystal is characterized in that x-ray powder diffraction feature absorption peak (2theta) values have feature peaks at the parts of 6.70 degrees, 7.26 degrees, 9.40 degrees, 12.86 degrees, 13.42 degrees, 16.48 degrees, 19.70 degrees, 22.10 degrees, 23.16 degrees, 23.86 degrees, 25.02 degrees, 25.92 degrees, 26.74 degrees, 28.34 degrees and 40.48 degrees. An Uloric alpha crystal form of the invention has simple process operation and low cost. Only Uloric needs to be dissolved in a single solvent of ethylene glycol monomethyl ether so as to avoid solvation crystal habit, and the crystal form is stable and has good reproducibility. Moreover, the Uloric alpha crystal form has good solubility and better dissolution rate than A crystals in a solid preparation.

Embodiments of the invention generally provide compositions of crystalline zeolite materials with tailored crystal habits and the methods for forming such crystalline zeolite materials. The methods for forming the crystalline zeolite materials include binding one or more zeolite growth modifiers (ZGMs) to the surface of a zeolite crystal, which results in the modification of crystal growth rates along different crystallographic directions, leading to the formation of zeolites having a tailored crystal habit. The improved properties enabled by the tailored crystal habit include a minimized crystal thickness, a shortened internal diffusion pathlength, and a greater step density as compared to a zeolite having the native crystal habit prepared by traditional processes. The tailored crystal habit provides the crystalline zeolite materials with an aspect ratio of about 4 or greater and crystal surfaces having a step density of about 25 steps/μm² or greater.

The invention discloses a method for preparing single-crystal high-temperature alloy from seed crystal subjected to solid-solution treatment. The method is characterized in that the original structurestate of seed crystal is converted into a uniform structure from a thick seed crystal structure through a solid-solution thermal treatment way, so that a structure on the upper part of a mushy zone under a melting-back interface forms a complex network shaped structure in a seed crystal single-crystal preparation process; un-melted solid phases are connected with each other to improve ability ofresisting deformation, so that flow speed when melt is poured to the upper end of the seed crystal does not need to limit, and therefore, the purpose of removing a spiral crystal selector structure ina mould shell is achieved. In a process of preparing the single-crystal high-temperature alloy, the seed crystal re-melting region is completely inhibited to form mixed crystal, so that the structureof the corresponding mould shell is simplified, mechanical degree and assembly precision of shell making are improved, and cost is reduced, and therefore, the defect of using a spiral crystal selecting section in the mould shell in a process of producing single-crystal high-temperature alloy by repeatedly using seed crystal is avoided.

The invention relates to a hydrous salt cold storage agent with the phase-transition temperature of 5-8 DEG C and a preparation method thereof. The cold storage agent comprises the following components in percentage by weight: 68.5-86.9% of a main energy storage agent, 1-3% of a supercooling prevention agent, 1-3% of an acid and alkali neutralizer, 1-5% of a thickening agent, 10-20% of a cooling agent, 0.1-0.5% of a crystal habit modifier and free water having the same molar ratio as that of sodium sulfate decahydrate. The phase-transition temperature of the cold storage agent can be adjusted in the range of 5-8 DEG C, the latent heat of phase change ranges from 20.0 J/g to 140 J/g, and the cold storage agent is long in cold-keeping time, simple in preparation process, low in cost, non-toxic, odourless, pollution-free and gelatinous and can be widely used for cold-chain transportation of fruits and vegetables, biomedical products and the like.

A flue gas desulfurization process is disclosed. Specifically the use of carboxylic acids to modify gypsum crystal habit in limestone forced oxidation. The technique is also applicable to other technologies where gypsum is produced as for example in phosphate fertilizer or paper industry.

This invention relates to an improved crystallization process of hydrogenated castor oil structurant which results in (i) a dispersion having a high concentration of the structurant, and (ii) a crystal habit/form that results in a higher yield stress in the final product, imparting high stability, for a given amount structurant. In addition, the resulting personal care product is consumer desired, as less structurant residue is observed on hair after the use of the personal care product.

The present invention belongs to the field of peroxide preparing technology in organic chemistry. Into reactor, water is added in advance, thiourea is thrown in batches and hydrogen peroxide solution containing stabilizer is dripped to produce thiourea dioxide. After finishing the reaction, thiourea dioxide is filtered and stoved to obtain crystallized thiourea dioxide powder. The added amountof the stabilizer is 0.1-5 wt% of thiourea and crystal habit modifier in 0..005-2 wt% of thiourea may be also added into water. The improved thiourea dioxide producing process has improved crystal state of thiourea dioxide and raised product purity and is suitable for industrial production in large scale.

The preparation method of urea peroxide uses hydrogen peroxide and urea as raw material, and is characterized by that adding urea in hydrogen peroxide whose mass percentage concentration is above 50%, at the same time adding stabilizing agent and crystal habit modification agent, after reaction, obtaining wet urea peroxide, drying to obtain white crystal granules, at the same time coating the surface of said urea peroxide white crystal granule with a layer of coating compound. Said invention is economic and practical, its simple batch yield rate can be up to above 85%, the ure peroxide content is up to above 92%.

The present invention utilizes a silicon member (single-crystalline silicon rod), which is cut out from a single-crystalline silicon ingot which is grown by a CZ method or FZ method, as the core wire when manufacturing a silicon rod. Specifically, a planar silicon is cut out from a body portion which is obtained by cutting off a shoulder portion and a tail portion from a single-crystalline silicon ingot and is further cut into thin rectangles to obtain a silicon bar. In the case that the crystal growth axis orientation is <100>, there are four crystal habit lines, and the silicon bar is cut out such that the surface forms an off-angle θ in a predetermined range with the crystal habit line. The provided polycrystalline silicon rod has a low impurity contamination and high single-crystallization efficiency.

The invention belongs to the field of material science, and relates to a method for preparing high-strength alpha-semi-hydrated gypsum from flue gas desulfurization gypsum. The method comprises the following steps: 1) preparing desulfurization gypsum slurry: sufficiently mixing the flue gas desulfurization gypsum and water according to a solid-liquid mass ratio of 1: (4-10), and warming to 80-95 DEG.C; 2) adding a habit modifier to prepare mixed slurry: adding the habit modifier in the desulfurization gypsum slurry according to a condition that the mass ratio of the flue gas desulfurization gypsum to the habit modifier is 1: (0.5-1.5), wherein the habit modifier is a mixture of magnesium chloride hexahydrate and magnesium sulfate hexahydrate in a mass ratio of 1: (0.1-0.2), continuously warming to boil, and refluxing; 3) adding a crystal habit modifier: adding the crystal habit modifier in the mixed slurry obtained in the step 2) according to a condition that the mass ratio of the flue gas desulfurization gypsum to the crystal habit modifier is 1: (1%-5%); and 4) crystal transforming. The uniform short hexagonal prism alpha-semi-hydrated gypsum can be prepared by the method simple in process, the rupture strength reaches 14.4 MPa, and the compressive strength reaches 44.5 MPa.

The invention provides a multistage continuous crystallization method of short rod-like methionine crystals. The method includes: connecting a plurality of crystallizers in series; under the action ofa circulating device, dissolving a methionine raw material at 80-130DEG C; letting the dissolved feed solution enter a first stage crystallization kettle, and controlling the kettle temperature at 60-80DEG C; enabling the slurry to enter a second stage crystallization kettle, and controlling the kettle temperature at 40-60DEG C; enabling the slurry to enter a third stage crystallization kettle, and controlling the kettle temperature at 25-40DEG C; letting the slurry enter a fourth stage crystallization kettle, and controlling the kettle temperature at 15-25DEG C; letting the final slurry flowout of the crystallization kettle and enter a solid-liquid separation system, discharging the separated solid out of the system, and returning part of the mother liquor into a dissolution kettle forfurther circulation, with the circulation volume being 20-60% of the mother liquor volume. The stage number of the crystallization kettles is supposed to be optimized according to the actual situation, and the general ideal situation is 2-4 stages. The prepared methionine crystals have short rod-like crystal habit, the crystal size is uniform, the bulk density is high, the fluidity is good, the quality is stable, the operation is simple, and the production efficiency is high, therefore the method is suitable for large-scale industrial production.

The invention discloses a preparation method for a synergetic reinforcing and toughening polypropylene composite material. The preparation method is characterized in that in the extrusion molding machining process, under the stimulation effect of an external stress field, the crystal habit of a polypropylene base is evolved into shish-kebab structures tightly arranged in a high orientation manner, and the intensity of the polypropylene material can be obviously improved through formation of the shish-kebab structures; and a flexibilizer dispersion phase form is evolved into the fiber shape and sheet shape from the sphere shape or ellipsoidal shape under the effects of a stretching force field and a rolling force field, and the toughness of the polypropylene material can be obviously improved through formation of the fiber or sheet-shaped dispersion phase form. By means of the preparation method, a force assembling unit is additionally arranged on a traditional extrusion device, operation is simple, continuous production can be achieved, control is convenient, the quality is stable, the production efficiency is high, the good industrialization and the good market prospect are achieved, and the preparation method can be widely applied to preparation of high strength and high toughness polypropylene base panels, sheets and film materials.

The invention relates to dehydrate desulfurated alpha high-strength gypsum based self-leveling mortar and a production method of the mortar. The invention relates to reuse of dihydrate desulfurization gypsum as solid waste generated in a coal-fired power plant and belongs to the technical field of a recycled comprehensive utilization of industrial by-product gypsum. The dehydrate desulfurated alpha high-strength gypsum based self-leveling mortar comprises 50 to 60% of alpha high-strength gypsum, 35 to 50% of an aggregate material, 1 to 5% of an exciting agent, 0.01 to 0.1 of a water-retaining agent, 0.5 to 2% of a binder, 0.1 to 1% of a water reducer, 1 to 3% of a auxiliary agent and 0.1 to 0.5% of a antifoaming agent, wherein the alpha high-strength gypsum comprises 80 to 100% of dihydrate desulfurization gypsum, 10 to 20% of water, 0.02 to 0.06% of a crystal habit modifier 1, and 0.02 to 0.06% of a crystal habit modifier 2. The production method of the invention comprises mixing the dihydrate desulfurization gypsum and crystal habit modifiers to obtain slurry, then treating the slurry through a sequence of steps of isothermal stirring, temperature maintaining, pH value regulating, dehydrating, drying and grinding to obtain the dehydrate desulfurated alpha high-strength gypsum, and mixing the dehydrate desulfurated alpha high-strength gypsum and additives comprising the aggregate and the like according to the above ratios and stoichiometric proportion to obtain the dehydrate desulfurated alpha high-strength gypsum based self-leveling mortar. The dehydrate desulfurated alpha high-strength gypsum based self-leveling mortar has the advantages of high strength, favorable flowability and low cost. The dehydrate desulfurated alpha high-strength gypsum based self-leveling mortar is not utilized in our country at present.

The preparation method of porous calcium carbonate includes the folloiwng steps: preparing calcium chloride aqueous solution and ammonium hydrogen carbonate aqueous solution, adding crystal habit correcting agent whose adding quantity is 0.01-0.05% of total mass of the above-mentioned two solutions; mixing them at 25-30 deg.C, fully stirring at normal pressure until the air is reacted, settling reaction product for 0.5-1 hr., separating sediment calcium carbonate from ammonium hydride solution, then washing said sediment calcium carbonate by using water, dewatering, drying so as to obtain the porous calcium carbonate product with strong adsorption force and penetrating quality. It can be extensively used in the industries of plastics paper-making, paint, printing ink and domestic chemicals, etc.

The invention relates to a composite crystal modifier for preparing alpha-type high-strength gypsum, which belongs to the technical field of gypsum additives and gypsum deep processing. The crystal modifier is formed by compounding inorganic fluoride salt accounting for 0.02 to 6 percent of the mass of a dihydrate gypsum dry base, and multi-element organic acid or organic acid salt accounting for0.02 to 1 percent of the mass of the dihydrate gypsum dry base. By utilizing the composite crystal modifier disclosed by the invention, when the alpha-type high-strength gypsum is prepared from dihydrate gypsum under a hydrothermal condition, a crystal habit of the alpha-type semi-hydrate gypsum can be effectively regulated and controlled, the alpha-type semi-hydrate gypsum can form short cylindrical alpha-type semi-hydrate gypsum crystals, so that the high-strength gypsum with the pressure resisting strength greater than 25MPa and a product thereof can be prepared. The composite crystal modifier is particularly suitable for preparing the alpha-type high-strength gypsum by adopting phosphorus gypsum with high fluorine impurity content as a raw material.

The invention discloses a gypsum-based composite binding material for extruded 3D printing and a preparation method thereof and relates to the field of civil engineering/3D printing materials. Aimingat defects in the prior art, the invention provides the gypsum-based composite binding material for extruded 3D printing. The binding material is prepared from the following components: gypsum, pre-excited material, mineral additives, a plasticized water reducing agent, a waterproof agent, a crystal habit improver, a cystallizing stabilizer, a retarder, a dispersing agent, a water-retentive and thickening admixture, an adhesive, an antifoaming agent, a crystal modifier, a lubricating agent and fibers. The binding material disclosed by the invention has the beneficial effects that the preparedgypsum-based composite binding material for extruded 3D printing is wide in source, excellent in liquidity and environmentally friendly and has excellent extrusion continuity, constructability, mechanical property, water seepage resistance and cracking resistance.

The present invention provides a no-crystalline state tigecycline and a preparation method of the tigecycline. The present invention has obvious bacteriostasis activity.

The present invention is for an oral osmotic controlled drug delivery system for a sparingly soluble drug comprising: a. a core comprising (i) finely particulate anhydrous carbamazepine (ii) a polymeric swelling agent consisting of one or more swellable hydrophilic polymers selected such that the polymeric swelling agent exhibits controlled swelling and the wall does not rupture or burst, (iii) a crystal habit modifier in whose presence, upon contact with an aqueous medium, the anhydrous carbamazepine being transformed into cuboidal or rod-shaped crystals of the dihydrate of carbamazepine, or mixtures thereof, and (iv) water-soluble compounds for inducing osmosis, b. a wall made of acylated cellulose which is impermeable to the components of the core, but permeable to water, and c. a passageway through the wall for releasing the components present in the core to the surrounding environment.

A method of producing an ammonium nitrate blasting agent and such an agent. The method comprises the steps of first combining together a crystal habit modifier with an aqueous solution of ammonium nitrate. Using the mixture of the crystal habit modifier and the ammonium nitrate solution, ammonium nitrate crystals are formed having a particle size of about 1 to about 500 microns. The ammonium nitrate crystals are then combined with an organic carbonaceous fuel at a ratio such that the organic carbonaceous fuel is from about 2 to about 10 percent by weight of the blasting agent.

The present invention relates to an herbicidal composition particularly stable at lower temperatures. The present invention provides a stable herbicidal composition comprising at least one pesticide in its salt form and a crystal habit modifying system comprising an alkoxylated alcohol and a polymer. Further the invention relates to a stable herbicidal composition comprising at least two pesticides in their salt form and a crystal habit modifying system comprising an alkoxylated alcohol and a polymer.

The invention relates to a crystallization method for improving the crystal habit of ethyl vanillin by adding polyvinylpyrrolidone. The method includes: adding an ethyl vanillin crude product and polyvinylpyrrolidone into a mixed solvent, performing stirring and heating to 35DEG C-50DEG C for dissolution, after the solid is completely dissolved, performing cooling to 15DEG C-25DEG C, adding ethylvanillin seed crystal, conducting grain growing for 10-40min, then performing cooling to 0DEG C-10DEG C, filtering the magma and conducting drying to obtain a ethyl vanillin crystal. The ethyl vanillin product prepared by the method provided by the invention has nonbreakable crystal, is thick flake shaped, has a height-to-width ratio of 0.11-0.25, large particle size, a main particle size of 275-508microm, a tap density up to 0.31-0.47g/mL, good fluidity and a repose angle of 37-47DEG C. The product obtained by the method is easy for filtration and drying, and is beneficial to storage and transportation, thus greatly improving the market competitiveness of the product.