872results about How to "Safe preparation" patented technology

The invention provides systems, modules, bioreactor and methods for the automated culture, proliferation, differentiation, production and maintenance of tissue engineered products. In one aspect is an automated tissue engineering system comprising a housing, at least one bioreactor supported by the housing, the bioreactor facilitating physiological cellular functions and/or the generation of one or more tissue constructs from cell and/or tissue sources. A fluid containment system is supported by the housing and is in fluid communication with the bioreactor. One or more sensors are associated with one or more of the housing, bioreactor or fluid containment system for monitoring parameters related to the physiological cellular functions and/or generation of tissue constructs; and a microprocessor linked to one or more of the sensors. The systems, methods and products of the invention find use in various clinical and laboratory settings.

The invention relates to a silicon-carbon composite negative pole material preparation method and a lithium ion battery. The preparation method comprises putting nanometer silicon and graphite micro-powder into a ball mill, carrying out ball milling uniform dispersion in an organic solvent environment, carrying out vacuum drying, putting the dried mixture and asphalt into a cone-type mixer, carrying out coarse mixing, putting the mixed powder subjected to coarse mixing into a mechanical fusion machine, carrying out mechanical fusion, carrying out heat treatment in an inert gas protective atmosphere and carrying out cooling to obtain the silicon-carbon composite negative pole material. The preparation method carries out asphalt softening coating on nanometer silicon so that silicon particle and electrolyte direct contact is avoided, a capacity reduction rate is delayed, a lithium ion diffusion path is shortened, an electrode material electron conduction loss is avoided, and first charge-discharge efficiency, a charge-discharge electric capacity and cycle performances are improved. Before coating, nanometer silicon is dispersed through graphite micro-powder so that it is avoided that in asphalt coating, nanometer silicon aggregation causes local capacity excess and nanometer silicon is uniformly dispersed.

The invention discloses a preparation method of 2,3-dichloropyridine. The preparation method is implemented by taking 2,3,6-trichloropyridine as a starting material and dissolving the 2,3,6-trichloropyridine into an solvent, taking an organic compound as a hydrogen donor and heating the organic compound in the presence of a metal catalyst until a micro reflux reaction occurs, carrying out post-treatment on reaction liquid so as to obtain a target product 2,3-dichloropyridine, wherein the solvent is a C1-C4 alcohol solvent; the hydrogen donor is of a structure shown in a formula (VI), wherein R refers to H<+1>, Na<+1> and NH<4+>; and the metal catalyst is a Pd/C catalyst. According to the invention, a CTH reaction is successfully applied to the dechlorination and hydrogenation of multiple chloropyridines, the catalyst can be repeatedly regenerated and continuously indiscriminately used, the hydrogen donor is relatively cheap, available and stable, nontoxic and easily removed from a system, the yield of target products is good, a small amount of by-products are extensive in use, chloropyridine raw materials with a high economic value are fully used, the operation steps are simple, and the preparation process is safe, green and environmental-friendly.

The invention discloses a preparation method of an oxidized Mxene/S compound applied to a lithium-sulphur battery cathode, relates to a preparation method of an S compound applied to the lithium-sulphur battery cathode, and aims to solve the technical problem of complex process of an existing Mxene/S compound preparation method. The preparation method disclosed by the invention comprises the following steps: 1, preparing Mxene powder; 2, oxidizing; 3, performing a water bath method. According to the preparation method, oxidized Mxene with high conductivity is taken as an S carrier, the preparation process is simple and safe, the production cost is low, large scale production is hopefully realized, and the oxidized Mxene/S compound as a lithium-sulphur battery cathode material has very highspecific capacity and cycling stability. The preparation method is applied to preparation of the lithium-sulphur battery cathode material.

The invention relates to a lithium negative electrode with a functional protective layer and a lithium sulfur battery. The lithium negative electrode is provided with a functional protective layer which is coated on the surface and includes a conductive polymer. In the lithium sulfur battery, the functional protective layer of the lithium negative electrode is contacted with an electrolyte, so that a stable interface is formed between the electrolyte and a base body of the lithium negative electrode.

The invention discloses a preparation method of 1T-phase molybdenum disulfide. The preparation method comprises the step of performing a hydrothermal reaction on an aqueous solution comprising a molybdenum source, a sulfur source and an ammonia source at 160-220 DEG C to prepare the 1T-phase molybdenum disulfide. The ammonia source is organic quaternary ammonium salt and/or inorganic ammonia salt. According to the preparation method disclosed by the invention, under the synergistic effect of the ammonia source and the hydrothermal reaction temperature, the 1T-phase molybdenum disulfide can be prepared through a one-pot reaction. The preparation method is simple, high in production efficiency and safe in preparation process.

The invention discloses a technological process for preparing stevioside from stevia rebaudiana bertoni. The technological process comprises the following steps: carrying out countercurrent extraction on the dried stevia rebaudiana bertoni raw material with water, sequentially adsorbing the obtained extracting solution with macroporous absorption resin columns which are connected in series, allowing the residual liquid after absorption to enter a countercurrent extraction device for cyclic extraction, reabsorbing the obtained extracting solution with the resin columns which are connected in series once again, and completing the extraction separation closed cycle process; after the whole countercurrent extraction and absorption process is completed, eluting the resin columns with water for removing impurities, desorbing with stripping liquid, collecting the stripping liquid, concentrating and drying to obtain the crude extract of the stevioside; and refining the crude extract by a solvent method and decolorizing resin respectively to finally obtain the stevioside product. In the obtained product, the content of the stevioside compound is 70-100%, wherein, two components such as the stevioside and rebaudioside account for 70-90% of the whole stevioside compound, thus meeting the standards for a medicine, a healthcare product or food.

The invention discloses a fluorine-containing low-dielectric-loss bismaleimide resin and a cured resin thereof, and a preparation method and application thereof. The resin is prepared by carrying out blend reaction on the following composition, wherein the composition comprises the following components in parts by weight: 20-120 parts of bismaleimide monomer, 20-120 parts of allyl compound, 20-120 parts of cyanate, 2-20 parts of thermoplastic high molecule and 0.1-1.5 parts of bismaleimide accelerator. At least one of the bismaleimide monomer and allyl compound contains fluorine. The bismaleimide resin disclosed by the invention has excellent heat stability, dielectric properties and mechanical properties, can be used as a high-performance composite material resin matrix, and has application value in the fields of copper clad plates, electronic packaging, aerospace and the like.

The invention relates to the technical field of high polymer materials, and in particular relates to a nano-cellulose reinforced silk fibroin composite material and a preparation method thereof, fibroin fibers and cellulose are dissolved in LiBr as a common solvent, the nano structure of the cellulose is retained by controlling the dissolution degree of the cellulose raw materials, wherein the dissolution temperature of the cellulose is controlled at 80-150 DEG C, the obtained fibroin fiber/cellulose blending solution can quickly form a gel, and the phenomenon of aggregation and uneven distribution of nanocellulose in the solution is avoided; the gel further can be prepared into a membrane and a porous material after being dried, so as to obtain the nano-cellulose reinforced silk fibroin composite material. The preparation process disclosed by the invention is simple and controllable; and the obtained composite material comprises uniformly-distributed nano-cellulose, the strength and the elongation at break of the nano-cellulose reinforced silk fibroin composite material are significantly enhanced compared to regenerated silk fibroin materials.

The invention discloses a positive electrode of a lithium-sulfur battery using a nitride/carbon nano tube as an interlayer, the battery and a preparation method. The preparation method comprises the following steps: preparing a nitride/carbon nano tube interlayer on the sulfur-containing positive electrode to form the positive electrode of the lithium-sulfur battery using the nitride/carbon nano tube as the interlayer; and carrying out assembling in an inert atmosphere to obtain the lithium-sulfur battery using the nitride/carbon nano tube as the interlayer, wherein the lithium-sulfur batteryusing the nitride/carbon nano tube as the interlayer comprises a positive electrode shell, the positive electrode of the lithium-sulfur battery using the nitride/carbon nano tube as the interlayer, adiaphragm, an electrolyte, a metallic lithium negative electrode and a negative electrode shell from bottom to top in sequence. The electrical conductivity of the positive electrode is improved, the transmission rate of lithium ions is promoted and the overall impedance of the battery is reduced by introducing the carbon nano tube with extremely high electron transport capacity and certain physical absorption capacity, and the diffusion of polysulfide is effectively limited inside the interlayer by adding nitrides with extremely high chemical adsorption capacity of polysulfide, so that the purposes of effectively relieving aero effect and improving the cycle performance of the battery are reached.

The invention relates to an anode catalyst used for a water electrolysis device of solid polymer electrolyte. The molecular formula of the catalyst is IrxRu1-xMyOz, wherein x is more than 0 and not more than 1, y is more than 0 and not more than 0.3, z is more than 1.5 and not more than 2.9, and M is one or more of such transition metals as Mo, W and Cr. In terms of the gross weight of the catalyst, the weight ratio of M in the catalyst is less than 10wt%. The required catalyst is characterized in that addition of the third component (or the fourth component) reduces the microcrystal grains of the catalyst, enlarges the specific surface area of the catalyst and improves the catalytic activity of the catalyst. The catalyst has lower overpotential and long life when serving as the anode catalyst in an SPE water electrolysis cell. The catalyst is used for the electrodes for oxygen evolution of the SPE water electrolysis cell, catalyst-membrane assemblies (CCM), membrane-electrode assemblies (MEA), regenerative fuel cells (RFC) and sensors.

The invention relates to a preparation method which is characterized by taking styrene and acrylics as monomers to synthesize a hollow polymer to coat various inorganic mineral matters by a sol-gel method. The preparation method comprises the following steps: firstly synthesizing a polymer core through emulsion polymerization, then forming a polymer intermediate on the polymer core through seeding polymerization, finally forming a polymer shell layer on the intermediate through seeding polymerization, and then forming hollow microspheres through alkali treatment; and coating inorganic mineral matters such as inorganic acid mineral salt or organo-siloxane and the like by the sol-gel method on the basis of the hollow microspheres. The method has the following beneficial effects: organic solvent dissolution, strong acid and alkali etching or high-temperature calcination is not needed to remove a hollow microsphere template, so the method is safe in preparation processes and is simple and convenient to operate; the hollow microspheres formed by different chemical components can be obtained by changing the raw materials of the core and the shell; and the application of the hollow microspheres in different occasions can be improved by modification of different inorganic mineral matters.

The invention discloses tea leaf protein polypeptide and a preparation and application thereof. Based on the total weight of the tea leaf protein polypeptide, the tea leaf protein polypeptide comprises 57 to 64 w/w percent of a component with the molecular weight of 6,000+/-100 Da and 33 to 39 w/w percent of a component with the molecular weight of between 300 and 1,000 Da; and the nitrogen solubility index (NSI) is between 98.5 and 99.9 percent. The preparation method for the tea leaf protein polypeptide comprises the steps of taking tea leaves, tea grounds or deep processing rejected materials of the tea leaves as raw materials and performing hydrolysis through a complex enzyme A. The tea leaf protein polypeptide has a variety of biological functions.

The invention discloses a preparation method of a debranched starch-lipid compound, and belongs to the technical field of modified starch processing. The method comprises the following steps: taking starch as a raw material, carrying out de-branching modification on the starch by adopting a de-branching enzyme, carrying out structural modification on the starch so as to improve the complexing capacity of the starch, and preparing the debranched starch-lipid compound in a water phase system by taking lipid as a ligand. Ordinary starch is used as a raw material; the debranched starch-lipid compound is prepared through enzymatic hydrolysis, de-branching modification and lipid complexing, the debranched starch-lipid compound and common starch interact with each other, the content of digestion-resistant starch in the product is greatly increased and can reach 39% at most, and the debranched starch-lipid compound has good effects of reducing blood sugar and benefiting intestinal tracts, hasa higher resistant starch content compared with that of a high-amylose corn starch-lipid compound, and is lower in cost.

The invention provides a preparation method for a gallium-based gallium-indium alloy nanorod and belongs to the technical field of preparation of nano particles. According to the preparation method, batch charging is conducted according to the requirement of 1 g liquid metal corresponding to 20 ml of dispersion media, and the dispersion media is mixed liquid of ethyl alcohol and deionized water; ultrasonication is conducted through a probe-type ultrasonic cell disruptor, ultrasonic power is controlled to 600-800 W, time is 2-4 h, and replenishment of a dispersant lost due to ultrasonic cavitation is conducted attentively in the process; after ultrasonication is finished, an obtained dispersion system stands for 10-14 h, thereby being fully aged; and the aged dispersion system is centrifuged for 3 min under the condition of 1000*G, and supernate is taken and contains the prepared gallium-based liquid metal nanorod. According to the preparation method, a physical breaking method is fully used, the gallium-based liquid metal nanorod is obtained directly, a pure physical process is achieved, main chemical reaction is avoided, the preparation process is safe, efficient and fast, and the obtained liquid metal nanorod can serve as a substrate or a ''building block'' conveniently for further operation.