798 results about "Aqueous alcohol" patented technology

The invention relates to a method for preparing a length-diameter-ratio nano-silver wire by a pH-value regulation solvothermal method. The method comprises the following steps of: preparing the following ethylene glycol solution, namely an ethylene glycol solution A of silver nitrate or silver acetate, an ethylene glycol solution B of polyvinyl pyrrolidone (PVP), an ethylene glycol solution C of water-soluble chloride and concentrated acid D; mixing the components according to a certain amount and fully stirring to form a final mixed solution; moving the final mixed solution into a reaction kettle; placing in an oven for reaction for a certain time; taking the reaction kettle out and cooling to room temperature to obtain mother liquid of the nano-silver wire; adding alcohol into the mother liquid for diluting, and removing supernatant liquor to obtain a precipitate; and repeatedly performing centrifugal separation, and thus obtaining nano-silver wire dispersion liquid uniformly dispersed in the alcohol. The method is simple, high in efficiency and low in cost, and can prepare high-quality nano-silver wires within a wider range of reaction condition; and prepared products are high in length-diameter ratio, good in length uniformity and low in impurity content.

The present invention provides a process for preparation of highly purified mogrosides mixture from low purity mogrosides mixture. The process comprises providing a mixture of low purity mogrosides, dissolving the low purity mogrosides mixture in water or an aqueous alcohol solution to form an initial solution of mogrosides, passing the initial solution through a column system, wherein the column system comprises a plurality of columns, and each column is packed with a sorbent having different affinities to impurities and mogrosides so that one or more columns retains more mogrosides than other columns, washing the columns to remove impurities with an acidic aqueous solution, a basic aqueous solution, and an aqueous alcoholic solution successively, eluting the columns with an aqueous alcohol solution that contains higher alcohol content than the aqueous alcohol solution used in the washing step, wherein the eluate from the columns with high content of mogrosides are combined, and drying the combined eluate to obtain high purity mogrosides with the content of the total mogrosides are more than 70% (w/w). The present invention also provides a sweetener mixture and product comprising high purity mogrosides.

The present invention relates to an aqueous alcohol buffer solution for substantially ambient, in vitro preservation of mammalian cells for a selected duration.

The invention discloses a method for preparing health food capsules by using cordyceps militaris and cocoon extracts, and aims to extract various nutrient substances with natural activities from the cordyceps militaris and cocoon to produce different types of nutrient health products, so that the utilization rate of the cordyceps militaris and cocoon is fully improved, and the market demand is met. The method is characterized by comprising the steps of extracting the nutrient substances from the cordyceps militaris and cocoon by performing freeze thawing, combined enzymolysis and aqueous alcohol precipitation sub-step extracting methods; adding a proper quantity of auxiliary materials into the nutrient substances to fully and evenly stir and sieve to prepare the particles; filling the particles into the capsules; wiping off residual powder adhered to the capsule shells; waxing; polishing; and sterilizing the capsules in a radiation mode after the capsules are packaged so as to obtain the finished product.

The invention discloses a multi-element high-entropy alloy film and a preparation method thereof. The multi-element high-entropy alloy film is a NiCrCoCuFe five-element high-entropy alloy film or a NiCrCoCuFeAl4.5 six-element high-entropy alloy film. The preparation method comprises the steps of ultrasonically washing a silicon wafer substrate with one polished surface through acetone, alcohol and de-ionized water in sequence; upwards air-drying the polished surface; putting the silicon wafer substrate and a high-entropy alloy block body target material onto a sample table and an evaporation source in a vacuum chamber of direct-current magnetron sputtering equipment respectively; vacuumizing the air pressure and filling argon gas; switching off valves of the sample table and the evaporation source for pre-sputtering; rotating the sample table, switching on the valves for sputtering, and taking out to obtain the multi-element high-entropy alloy film. According to the method, the sputtering rate is stable, so that the high-entropy alloy film material with uniform thickness can be obtained; the cooling rate is high, so that the formation of intermetallic compounds can be inhibited, and the formation of a single solid solution phase can be facilitated; the operation process is simple and feasible, and the application range of the high-entropy alloy material is extended.

The present invention includes a process for the dehydration of ethanol by adsorption of water at elevated pressure and for the regeneration (purging) of adsorbent at a lower pressure than the pressure used for the adsorption of water where the ratio of the duration of the regeneration (purge) step to the duration of the water adsorption step is higher than 0.1 and the temperature of adsorption is greater than 260 degree Fahrenheit.

A magnetic toner with a negative polarity for developing latent electrostatic images is made of toner particles, each toner particle containing a binder resin, a magnetic powder, and a charge control agent, the surface of the magnetic toner satisfying the relationship of 2x10-7<=C/Sw<=10x10-7, provided C<=8x10-3, wherein C is an amount (g/g) of the charge control agent dissolved in a solvent comprising water and methanol, and Sw is a specific surface area (cm2/cm3) of the toner particles determined from a weight-average particle diameter of the toner particles. An image forming apparatus has an electrostatic image bearing member, and a unit for developing the electrostatic image with the above magnetic toner, the unit having a developer holding member provided with a magnet, and a developer container. A method for measuring the amount of a charge control agent extracted from the surface of magnetic toner particles employs an aqueous alcohol solvent of water and an alcohol.

A Renewable Fischer Tropsch Synthesis (RFTS) process produces hydrocarbons and alcohol fuels from wind energy, waste CO2 and water. The process includes (A) electrolyzing water to generate hydrogen and oxygen, (B) generating syngas in a reverse water gas shift (RWGS) reactor, (C) driving the RWGS reaction to the right by condensing water from the RWGS products and separating CO using a CuAlCl4-aromatic complexing method, (D) using a compressor with variable stator nozzles, (E) carrying out the FTS reactions in a high-temperature multi-tubular reactor, (F) separating the FTS products using high-pressure fractional condensation, (G) separating CO2 from product streams for recycling through the RWGS reactor, and (H) using control methods to maintain temperatures of the reactors, electrolyzer, and condensers at optima that are functions of the flow rate. The RFTS process may also include heat engines, a refrigeration cycle utilizing compressed oxygen, and a dual-source organic Rankine cycle.

The invention relates to preparation of core/shell structural polystyrene/titanium dioxide composite photo catalyst, comprising the steps of: (1) dissolving titanium alkoxide in absolute lower alcohol to be prepared into aqueous alcohol solution of titanium alkoxide with the concentration of titanium alkoxide in the lower alcohol being 0.004-0.100mL/Ml; (2) adding polystyrene microballs into the aqueous alcohol solution of titanium alkoxide to experience ultra-sound and stirring to obtain a uniform mixture; (3) placing a crucible holding, the polystyrene microballs and the aqueous alcohol solution of titanium alkoxide in a closed container, heating the closed container to 70-200 DEG C for heat treatment and preserving temperature for 1-96 hours; washing and drying to obtain the core/shell structural polystyrene/titanium dioxide composite photo catalyst. The photo catalyst prepared by the invention maintains the characteristic of high catalytic activity of titanium dioxide nano crystal grain, and has the photo catalytic activity similar to the photo catalytic activity of nano titanium dioxide prepared by gas phase method in the majority of photo catalysis reactions.

The invention relates to a dry type making method for animal specimen that includes six steps: collecting material, reshaping antisepsis fix and tube cavity cast, alcohol dewatering fix, glycerol process, turpentine impregnation and air drying, material repairing tinction preservation or seal up for keeping. Thereinto, in step 1, the animal material is bleed and killed via health quarantine, in step 2, potting it with the formalin with colorless glycerin and phenol or alcohol solution, in step 3, controlling the concentration of every step and fixed time, in step 4, marinating it with glycerol moisture absorption soften liquid, and transfer it from low concentration to high concentration of glycerin, and the time is prolonged gradually, in step 5, treating it with turpentine continually, in step 6, printing it. The invention improves the present technique, the quality of specimen is improved greatly, and that can keep the original state of material, the color and the luster. The dried specimen is sanitation without peculiar smell, and good at handle and quality.

The invention discloses a preparation method of a high-molecular nylon powder material used for 3D printing. The method comprises the following steps: 1)placing a nylon material, a nucleating agent and alcohol in a high pressure reaction vessel; 2)operating the high pressure reaction vessel for stirring, introducing nitrogen for protection, heating the material in the high pressure reaction vessel to 130-160 DEG C; 3)insulating and dissolving, insulating the reaction vessel for 2-3 hours, fully stirring, dissolving the nylon material; 4)cooling, depositing and precipitating, controlling the stirring speed of the high pressure reaction vessel, slowly cooling, and gradually completing the precipitation and moulding of the nylon powder; 5)filtering, cooling the material in the high pressure reaction vessel to less than 70 DEG C, transferring the mixture to a filter tank, separating the solvent from the solid; 6)centrifuging, transferring the filter residue to a centrifuge for removing the solvent; 7)drying under vacuum; thoroughly removing the solvent in a vacuum drying machine; and 8)sieving the dried nylon powder, and controlling the particle size of nylon powder at 35-50 mum to obtain the required material.

A method of water-base casting technological preparation of the carbon material with advanced property, it belongs to the field of fuel cell, adopt intermediate phase carbon powder as raw materials, take short carbon fiber or grahpite as the enhanced modified material, the solution of casting slurry adopts the mixture of the water and alcohol, through the water-base cast techniques prepare the carbon/carbon composite green compacts, press the multiplayer casting green compacts to gain the laminating green compacts which have air interval channel, then through the high temperature sintering technique and the resin impregnation sealing of hole, finally get the bipolar plate of fuel cell of proton exchange membrane. This invention adopts firstly the casting forming technique to prepare the carbon/carbon composite bipolar plate.

A preparation method for bismuth(Bi)-tellurium(Te) nano-porous thermoelectric semiconductor material is disclosed, belonging to the technical field of the thermoelectric material. The preparation method comprises the following step: Bi-Te-based nano-powders Bi[2-x]Sb[x]Te[3-y]Se[y] (x=0-1.9, y=0-0.5) are placed in alcohol solution with a pore-forming agent sufficiently dissolved therein, in orderto be mixed by a method which combines ultrasonic wave with magnetic suspension agitation, the powders are sintered into bulk material by means of a discharge plasma sintering technology after being dried, and during the sintering, the pore-forming agent is utilized for sublimation and evaporation at the particular temperature so that the bulk material can form nano-sized pore structure therein inthe process of sintering in order to form the nano-porous material. The Bi-Te-based alloy belongs to rhombohedral crystal system structure. The preparation method has the advantages of simple preparation, easy operation, lower cost, accurate ingredient control, relatively uniform size and distribution of the nano pores and the like.

The invention discloses a preparation method of carbon-coated lithium titanate, comprising the following steps of: 1) weighing and dispersing lithium source and titanium source in distilled water or deionized water; 2) adding long-chain aliphatic carboxylic acid to the water, heating the water to 30 to 100 DEG C, followed by uniform stirring and dispersion in order to obtain suspension; 3) transferring the suspension into a closed reaction container for being heated so that the suspension is subjected to reaction at constant temperature; 4) cooling reaction products to room temperature upon the end of the reaction, repeatedly washing with mixed liquid of alcohol and water, centrifuging and drying the reaction products, and collecting precursor; and (5) putting the collected precursor in an atmosphere furnace filled with non-oxidative gas to be roasted, and then cooling the roasted precursor to result in the carbon-coated lithium titanate. Compared with the prior art, the preparation method according to the invention achieves the formation of uniform carbon-coated layers under the protection of non-oxidative gas by means of surface coordination of long-chain aliphatic carboxylic acid and lithium titanate, thus the conductivity of lithium titanate can be improved and the high-rate and high temperature performances of lithium ion secondary battery can also be enhanced.