9results about How to "Good crystal form" patented technology

The application provides a preparation method of black phosphorus arsenic material, comprising the following steps: mixing gray arsenic, red phosphorus and an additive, and then placing the mixture in a high-temperature area to react in a closed container in a protective atmosphere or vacuum, and synchronously depositing in a low-temperature area to crystallize, so as to obtain black phosphorus arsenic material; wherein the additive comprises tellurium iodide; the temperature of the high-temperature area is not lower than 550 DEG C, and the temperature of the low-temperature area is 450-530 DEG C; and the black phosphorus arsenic material is black phosphorus arsenic single crystal. The application realizes controllable synthesis of flaky black phosphorus arsenic single crystal, and has excellent applicability in semiconductor devices.

The invention provides a Tl-series superconducting thin film and a preparation method thereof, and belongs to the field of superconducting thin film materials. The preparation method of the Tl-series superconducting thin film provided by the invention comprises the following steps: mixing nitrate or acetate of metal, ethylenediaminetetraacetic acid, a water-soluble high-molecular polymer and water to obtain precursor sol; the metals are thallium, barium, calcium and copper; the molar ratio of thallium to barium to calcium to copper to ethylenediamine tetraacetic acid is (2-3): 2: 1: 2: (7-8); coating a substrate with the precursor sol to obtain a precursor film; and carrying out heat treatment on the precursor thin film in an oxygen atmosphere under a closed condition to obtain the Tl-series superconducting thin film. The Tl-series superconducting thin film obtained by the preparation method provided by the invention presents a Tl-2212 phase, no impurity phase is generated, and the critical transition temperature can reach 100K and is close to the Tl-2212 theoretical superconducting transition temperature.

The utility model relates to crystallization equipment technical field, concretely relates to a kind of ectoine production crystallization tank, including tank body. Concentrated liquid feed inlet and ethanol adding port are set on the tank body, ethanol feed inlet is connected with the spraying device in tank body, jacket is set on the outside of tank body, the jacket includes upper jacket and lower jacket, the volume of upper jacket and lower jacket is consistent, the upper side of the upper side of upper jacket is medium inlet, the lower side of the other side is medium outlet, the lower side of the lower side of lower jacket is medium inlet, the upper side of the other side is medium outlet, flow monitoring instrument and control valve are installed on the water inlet pipeline of jacket, temperature monitoring instrument is installed on the water outlet pipeline of jacket. The utility model can realize the uniform addition of ethanol on the one hand, and can realize the more stable control to the temperature in tank body on the other hand, so as to help ectoine better crystallization, help to ensure better crystal form and purity, positively affect product quality.

This invention discloses a photochromic material incorporating a HOF (Hormone-Organic-Flatform) framework, its preparation method, and its applications. Belonging to the field of organic solid-state photochromic materials technology, it utilizes a host-guest eutectic method to load photochromic molecules onto the HOF framework material. This invention also discloses the photochromic material prepared by the above method, and its applications in information storage encryption and anti-counterfeiting. While achieving photochromism, the host-guest eutectic method exhibits a faster photoresponse rate and better photochromic performance compared to physical adsorption methods, showing greater potential in anti-counterfeiting and excellent information storage encryption capabilities.

The application relates to the technical field of nanometer material preparation, in particular to a manganese antimonate nanometer material and a preparation method thereof. A manganese salt solution, an antimony salt solution and a complexing agent solution are mixed, and then pH is adjusted to obtain a precursor solution; the precursor solution is mixed with a soft film edition agent, and then stirring and heating are carried out to form a sol, and the sol is subjected to standing and drying to obtain a dry gel; the dry gel is subjected to one-stage heat treatment in an air or oxygen atmosphere, and then cooling and grinding are carried out after the one-stage heat treatment, and then two-stage heat treatment is carried out after the grinding to obtain the manganese antimonate nanometer material. The manganese antimonate nanometer material with high purity and high performance is prepared by controlling solution chemistry, gelation conditions and heat treatment parameters. The product has high purity, good crystal form, simple preparation mode, high operability and high repeatability. The product is suitable for the fields of magnetic materials, catalysts, battery materials and the like, and has wide industrial application prospects.

The invention discloses a novel method for crystallizing thiamine nitrate, which comprises the following steps of: adding ammonium nitrate prepared by mixing industrial-grade stronger ammonia water and concentrated nitric acid according to the volume ratio of 1: 1 into 15-20 percent by mass of thiamine thiooxide liquid, and regulating the temperature to 15-45 DEG C; and adjusting the pH value with ammonia water not higher than 25%, adding a seed crystal when the pH value is 4.0-5.0 until the final pH value is 5-8, stirring and crystallizing for 0.5-2 hours at the speed of 100-600r / min, and then filtering and drying. Preferably, the concentration of ammonia water is 5%, the temperature is 15-35 DEG C, and the rotating speed is 300-400 r According to the method, parameters are accurately regulated and controlled, the length-diameter ratio of thiamine nitrate is reduced to 1.8-2.1, the yield is increased to 93-95% from 87%, the flowability is greatly optimized, the problems that existing products are fine in grain and prone to electrostatic adsorption are solved, the process is simple, the cost is low, and the method is suitable for industrial production.

This invention belongs to the field of methoxyamine hydrochloride preparation technology and discloses a method for separating methoxyamine hydrochloride and ammonium chloride. The method involves cooling a mixed solution containing ammonium chloride and methoxyamine hydrochloride to selectively crystallize out ammonium chloride, which is then separated to obtain ammonium chloride crystals and a mother liquor enriched with methoxyamine hydrochloride. The mother liquor is then concentrated or dissolved by heating, followed by ultra-low temperature crystallization, separation, and drying to obtain methoxyamine hydrochloride crystals. This invention uses ultra-low temperature segmented crystallization to selectively precipitate ammonium chloride, resulting in methoxyamine hydrochloride crystals with a purity ≥99.9% and ammonium chloride crystals with a purity ≥98%.

This invention relates to the field of wastewater treatment technology, and more particularly to a method for enhancing anaerobic ammonia oxidation (AAO) denitrification using iron-loaded polyurethane porous materials. The method includes the following steps: Anaerobic ammonia oxidation sludge, iron-loaded polyurethane porous materials, and wastewater containing ammonia nitrogen and nitrite nitrogen are thoroughly mixed in an anaerobic reactor and reacted under anaerobic conditions at a temperature of 31-35°C. The iron-loaded polyurethane porous materials are prepared as follows: polyurethane sponge is selected as a carrier, cut and cleaned, and then immersed and stirred in a mixed iron salt solution for a period of time. The pH of the mixed solution is adjusted to alkaline, resulting in the formation of a red precipitate. The iron-loaded polyurethane porous materials are then hydrothermally synthesized. The mixed iron salt solution includes ferric chloride and ferric nitrate. The carrier material prepared by this invention, when applied to an anaerobic ammonia oxidation system, can effectively shorten the process start-up time, promote the enrichment and biofilm formation of anaerobic ammonia oxidizing bacteria, and achieve a high total nitrogen removal rate.