105 results about "Crystallization" patented technology

A supported graphene device comprises at least one graphene feature of 1 to about 10 graphene layers having a predetermined shape and pattern, with at least a portion of each graphene feature being supported on a substrate. In some embodiments the device comprises graphene features supported on crystalline semiconductor substrate, such as silicon or germanium. The graphene features on a crystalline semiconductor substrate can be fabricated by forming an amorphous carbon doped semiconductor on the crystalline semiconductor substrate and then epitaxially crystallizing the amorphous semiconductor with carbon migration to the surface to form a graphene feature of one or more graphene layers. The epitaxy can be promoted by heating the device or by irradiation with a laser. Methods for fabricating graphene on a variety of substrates, over large areas with controlled thicknesses employ ion implantation or other doping techniques followed by pulsed laser annealing or other annealing techniques that result in solid phase regrowth are presented.

A pressure-adjustable casting method includes such steps as putting casting mould and molten metal respectively in upper sealed chamber and crucible, vacuumizing them, filling inertial gas or compressed air in the crucible, pressing the molten metal in mould cavity along the flow-up tube under the action of adjustable pressure difference, vacuumizing the vacuum hood while adjusting the pressure in crucible to quickly change it from negative pressure to positive one, solidifying the cast workpiece, and releasing the pressure. Said crucible for adjusting pressure is composed of crucible body, water cooling flange, and pressure adjusting pipe interface.

A method for growing a crystal of an Al-containing III-V group compound semiconductor by the conventional HVPE method, characterized in that it comprises a step of reacting Al with hydrogen halide at a temperature of 700° C. or lower to form a halide of Al. The method has allowed the suppression of the formation of aluminum chloride (AlCl) or aluminum bromide (AlBr) reacting violently with quartz, which is the material of a reaction vessel for the growth, resulting in the achievement of the vapor phase growth of an Al-containing III-V group compound semiconductor at a rate of 100 microns/hr or more, which has lead to the mass-production of a substrate and a semiconductor element having satisfactory resistance to adverse environment.

Communications cable is provided for use in downhole wells wherein the cable will be exposed to a temperature of at least 280° C., the cable including as a component thereof a composition comprising melt-fabricable tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer and melt flowable polytetrafluoroethylene, said polytetrafluoroethylene by itself having no tensile property and being present in said composition in an amount effective to enable the component to withstand this temperature, with the high temperature exposure of the cable component being effective to thermally transform the composition in the solid state, thereby obtaining epitaxial co-crystallization.

A process is provided for preparing spiro-hydantoin compounds of the formula II

wherein Z is N or CR_4b; K and L are independently O or S; Ar is an optionally substituted aryl or heteroaryl; A₂ is a linker, G′ is a linker; Q is a linker; and R₂, R_4a, R_4c, and R_h are defined in the specification. The process optionally includes the enantiomeric separation of intermediates to allow preparation of enantiomers of the spiro-hydantoin compounds of formula II. Substituted spiro-hydantoin compounds may be prepared from the spiro-hydantoin compounds of formula II. The spiro-hydantoin compound of formula II and the substituted spiro-hydantoin compounds are useful in the treatment of immune or inflammatory diseases. Also, provided are products made by the instant inventive process and crystalline forms (prepared by any process) of the substituted spiro-hydantoin compound, 5-[(5S, 9R)-9-(4-Cyanophenyl)-3-(3,5-dichlorophenyl)-1-methyl-2,4-dioxo-1,3,7-triazaspiro[4.4]non-7-ylmethyl]-thiophene-3-carboxylic acid, including solvates and salts thereof, as well as methods of use thereof. Crystalline forms of certain intermediates are provided.

The invention relates to a method of preparing a vine tea mask capsule. The method comprises the steps of preparing vine tea powder, degreasing, extracting vine tea flavonoid, crystallizing and removing impurities, crushing and disinfecting, preparing mask capsule powder and finally filling the powder into a capsule. The vine tea mask capsule is composed of pure plant components, is antiseptic-free and additive-free, and causes no irritation and harm to skins. When a user is using the capsule, the user opens the capsule, fetches 80ML hot water with 80 DEG C, and slowly and uniformly pours thepowder in the capsule into the hot water while stirring. The user stirs the capsule powder to make the power fully dissolved and then pours into a mold plate. When the dissolved powder is cooled to be a mask, the user applies the mask onto the face for 20 to 30 minutes. The vine tea mask is prepared from pure natural konjac gum andxanthan gum, is crystal clear in appearance, and is fast in penetration and fine in absorption. No non-woven fabric needs to be a medium, and most essences are not liable to be absorbed by mask paper. Furthermore, various masks with beauty treatment efficacies can be prepared based on needs of skin whitening, skin dullness removal, rosy cheek improvement, acne clearance, toxin expelling or the like.

The invention relates to a method for purifying citrulline from a watermelon, which comprises the following steps: removing the pulp of a citrulline, carrying out ultrasonic extraction twice to three times with acid water, settling impurities with a settling agent, purifying citrulline with macroporous resin columns and strong-acid cation resin columns in series, eluting with ammonia water, carrying out concentrative crystallization, dissolving roughly crystallized substances with acid water, adjusting the pH with ammonia water, recrystallizing and the like. The method has the advantages of high extraction efficiency, low energy consumption and high product purity.

The invention discloses a method for preparing a ZnWO4 nanorod photocatalysis material. The method includes preparing a tungstic acid solution A, a zinc chloride solution B and a sodium citrate solution C; dropwise adding the solution A and the solution C into the solution B to form a solution D; regulating potential of hydrogen (pH) of the solution D to 6-8, and uniformly stirring to obtain a solution E; adding the solution E into a microwave hydrothermal reaction kettle, performing a heating reaction, naturally cooling the solution E to the room temperature after the reaction is finished, and taking out the reaction kettle; and opening the reaction kettle, washing a product for 4-6 times by deionized water and absolute ethyl alcohol, and drying to obtain the ZnWO4 nanorod photocatalysis material. According to the method, the microwave hydrothermal method is utilized to rapidly synthesize the ZnWO4 nanorod with the photocatalysis property, the later crystallization heat treatment is not required, the obtained product is high in purity, and the shape is controllable. The ZnWO4 nanorod with the photocatalysis effect can be synthesized in 10 minutes, and the degradation rate of the prepared ZnWO4 nanorod to rhodamine B in 50-60 minutes can reach to 97%-99%.

The invention discloses a method for comprehensively extracting fucoxanthin and brown alga polyphenol from gulfweed, which comprises the following steps: carrying out repeated freeze-thawing and centrifugation on fresh gulfweed or frozen reserved gulfweed to control the water content of brown alga; adding an organic reagent into the seaweed, leaching in a dark place for 1-24 hours, carrying out vacuum filtration to obtain a leaching solution, repeating the leaching operation until the leaching solution is colorless, merging the leaching solutions, concentrating the leaching solution until abundant precipitate appears in the solution, and filtering to remove the precipitate and obtain the filtrate; crystallizing the filtrate at low temperature, and filtering to obtain fucoxanthin; and adding a fat-soluble solvent into the filtrate, carrying out repeated liquid-liquid extraction until the fat-soluble solvent layer is colorless, merging the fat-soluble solvent layers of multiple extraction processes, and carrying out low-temperature concentration until a greenish yellow solid precipitates in the solution, thereby obtaining the brown alga polyphenol extract. The method has the advantages of high raw material utilization ratio and high extraction efficiency, and is simple to operate.

The invention belongs to the energy material technique field, especially relates to a method for preparing lithium iron phosphate/carbon composite material as an anode material of a lithium ionic cell. The invention synthesizes the lithium iron phosphate by using an iron oxide hydroxide as an iron source, which is not seen at home and abroad. The synthesis process of the compound comprises: mixing the iron oxide hydroxide and a lithium salt, a phosphate salt according to a stoichiometric ratio, adding proper amount of carbon sources and liquid ball milling medium and ball milling the mixture, reacting the dried mixture at a certain temperature, finally getting the lithium iron phosphate/carbon composite material. The products from the invention have advantages of high purity, good crystallization, high capacity and good circulation performance under a high/low rate based on the electrochemistry property testing.

The invention relates to the technical field of water treatment, and particularly relates to and discloses a treatment method for recycling high-hardness and high-salinity waste water. The treatment method comprises the following steps: (1) removing organic matters, softening and removing salt for the first time by using a primary treatment system; (2) removing organic matters, softening and removing salt for the second time by using a secondary treatment system; (3) performing evaporation and freezing crystallization treatment on concentrated liquid. According to the treatment method for recycling high-hardness and high-salinity waste water, a physical and chemical treatment and membrane integrated technology and an evaporation and freezing crystallization technology are combined, high-quality water can be recycled, the resin is softened to regenerate internal supply of an acid and alkali medicament, industrial salt is generated, resources are utilized effectively and comprehensively,long-term effective and stable operation of the system is guaranteed, and the advantages of good treatment effect, stable and reliable operation and capability of completely utilizing resources are achieved.

The invention discloses a phosphor-doped CHA molecular sieve, and a preparation method and application thereof, and belongs to the field of zeolite molecular sieve preparation technology and application. The preparation method is characterized by comprising the following steps: mixing a silicon source, an aluminum source, sodium hydroxide, potassium hydroxide, SAPO-18, AlPO-18 or SAPO-34 seed crystal and distilled water to form uniform gel; performing hydrothermal crystallization, performing washing and drying after performing solid-liquid separation on a crystallized product, thereby obtaining the phosphor-doped CHA molecular sieve which can perform ammonia gas selective catalytic reduction denitration catalysis after being loaded with Cu<2+>. Addition of seed crystal such as SAPO-18 is akey factor for generating the phosphor-doped CHA molecular sieve. The method can be used for preparing the phosphor-doped CHA molecular sieve with high degree of crystallinity under a conventional hydro-thermal synthesis condition, so that ammonia gas selective catalytic reduction denitration (NH3-SCR) low-temperature activity is good.

The invention discloses a method for preparing pharmaceutical-grade microcrystalline cellulose from cotton linter. The cotton linter is cooked, degreased, bleached, purified, hydrolyzed, filtered, washed, dried and pulverized to obtain the pharmaceutical-grade microcrystalline cellulose, wherein, in the procedure of cooking and degreasing, pulping is performed by the cotton linter ethanol method; and a cotton linter ethanol pulp is prepared according to the volume ratio as 1:4-10 of the absolutely dry mass of the cotton linter to ethanol with 55% of mass fraction, and then the pulp is cooked at the temperature of 190-195 DEG C for heat preservation for 30-90 minutes. In the procedure of bleaching and purifying, an EAPP process is adopted, wherein an E section is the alkali treatment section by adopting NaOH; an A section is the acid treatment section by adopting sulfuric acid; and a P section is the H2O2 bleaching section. For the microcrystalline cellulose prepared by the method, the ash content is 0.0375%, the water content is 4.5%, the degree of crystallization is 63.96% and the granularity is 22.72mu m, and the indexes reach the national standard of the pharmaceutical-grade microcrystalline cellulose.

The invention relates to a method for extracting unsaturated fatty acids from eucalyptus leaves. An organic solvent is used for extraction. Unsaturated fatty acid crude extracts are obtained by low-temperature crystallization treatment after dissolution, and more than 7 percent of unsaturated fatty acid component is obtained by CO2 critical extraction. The extraction method is simple, convenient, low in cost, stable in process and high in extraction efficiency. The unsaturated fatty acids in the eucalyptus leaves cotain polyunsaturated fatty acids such as linoleic acids and linolenic acids, are natural extracts, have the effects of resisting bacteria, resisting oxidation, depressing blood fat, lowering cholesterol, improving memory, suppressing tumors and the like, and can be widely applied to the fields of feeds, cosmetics, foods, biochemical engineering, even medicine and the like.

The invention discloses Mn<4+> doped fluoroaluminate red fluorescent powder as well as a preparation method and an application thereof. The method comprises steps as follows: hydrofluoric acid and water are added to a polytetrafluoroethylene container, K2MnF6 is added and stirred to be dissolved, and then KF is added; after KF is dissolved, K3AlF6 is added and continuously stirred to be completely dissolved, and then the mixture is continuously stirred for 30 min; the mixture is left to stand after stirring is stopped, suction filtration is performed, a filter cake is dried under the vacuum condition at the temperature of 70 DEG C, and the Mn<4+> doped fluoroaluminate red fluorescent powder is obtained. Compared with the prior art, the K3AlF6:Mn<4+> red fluorescent powder is synthesized in a hydrofluoric acid aqueous solution, and the diluted aqueous solution has a function of purifying the K3AlF6 phase; excessive KF.2H2O is added, so that the K3AlF6 phase is crystallized and separated to be purified in the aqueous solution; the obtained fluorescent powder has a narrow emission spectrum range, and the reabsorption phenomenon is effectively avoided; the phase of the synthesized fluorescent powder is pure, and the light emitting efficiency and collection rate are high; the color gamut range of a white light LED device packaged by the fluorescent powder is wide.

The present invention provides a method for preparing a mordenite, which is a method for preparing the mordenite through a hydrothermal crystallization by using natural aluminosilicate minerals as total silicon sources and total aluminum sources, comprising the steps of: subjecting the natural aluminosilicate minerals to activation treatment which is an activation by sub-molten salt and an activation by thermal treatment; selecting and mixing the activated natural aluminosilicate minerals according to the silicon-to-aluminum ratio of the targeted mordenite, adding thereto deionized water, sodium hydroxide, crystal seed, a templating agent to obtain a reaction mixture; adjusting the reaction mixture by using an inorganic acid to have a pH of 10-13, and then aging it at 40-80° C. for 6-24 hours; and subjecting the aged reaction mixture to hydrothermal crystallization, and then filtering, washing, drying and calcinating the crystallized product to obtain the mordenite. The method for preparing a mordenite provided in the present invention enlarges the sources of raw materials for a molecular sieve, has a low cost and a simple process route, and can largely reduce the cost for synthesizing a molecular sieve.

The invention provides a purification method for gallium, which comprises the following steps of pre-purification, freezing crystallization, pickling, and packaging, wherein in the pre-purification step, liquid gallium is put into single equipment containing pickling liquid for stirring reaction, ultrasonic vibration is adopted, and spongy gallium impurities are separated from the liquid gallium preliminarily; in the freezing crystallization step, the liquid gallium separated preliminarily is subjected to freezing crystallization treatment, and heavy metal impurities in the gallium are removed; in the pickling step, the gallium subjected to the freezing crystallization treatment is placed into the single equipment for heating and fusing, a pickling solution is added and stirred, and the gallium is separated from spongy gallium through the ultrasonic vibration after stirring; and in the packaging step, the gallium separated after the pickling step is completed is packaged. The purification method can better achieve a purification effect; the purification flow is simple; the purification method can be automatically controlled easily, and is safe, environment-friendly and power-saving; no special equipment is required; and the enterprise cost is lowered.

The invention discloses a preparation method of fullerol. The method comprises the steps that: step 1, an aromatic hydrocarbon solution of fullerene is subjected to a sufficient oxidation treatment in an oxidation reagent, such that a fullerene oxide suspension liquid is obtained; step 2, the fullerene oxide suspension liquid is subjected to centrifugal washing and is dried, such that fullerene oxide powder is obtained; step 3, the fullerene oxide powder is dispersed or dissolved in a solvent; and the material is dried, such that fullerene oxide powder is obtained; step 4, the fullerene oxide powder is hydrolyzed; and an obtained product is dried, such that fullerol powder is obtained; and step 5, the fullerol powder is re-crystallized; and the obtained product is dried, such that pure fullerol is obtained. Fullerol prepared with the method provided by the invention can be produced in batches, and has excellent performances in respects of free radical removing and anti-oxidation.