124 results about "Colloidal iron" patented technology

A method of making a colloidal solution of indium phosphide semiconductor nanocrystals, includes forming a first solution by combining solvents and ligands; and heating the first solution to a temperature equal to or higher than 290° C. and, while heating, adding to the first solution, a second solution containing trialkylindium, a phosphorus precursor and solvents and ligands so that a reaction takes place that forms a colloidal solution of indium phosphide semiconductor nanocrystals. The method further includes forming core shell indium phosphide semiconductor nanocrystals by forming semiconducting shells on the nanocrystals.

This invention discloses a method for producing nanometer composite oxides. The procedures comprise: solubilise the molten substance in the mixture of hydrocarbon component and surfactantto form the molten salt-in-oil super solubilising colloidal group, which limits the hydroxide generated by the reaction of molten substance and precipitant in the colloidal group, so as to avoid the increase of particle size, and then obtain the nanometer composite oxides by burning.This invention is characterized of low cost of surfactant and hydrocarbon component, single distributed colloidal groups, narrow particle size distribution range and high yield. Besides, the process is simple and is adapted for industrial mass production. The nanometer composite oxide produced by this invention has large specific surface area and pore size, which makes it suitable for being used as catalyst carrier.

The invention discloses a preparation method of biomass-based colloidal carbon and in particular relates to a colloidal carbon ball using xylose or glucose as a precursor. The colloidal carbon ball is prepared by hydrolyzing biomass by using dilute acid or concentrated acid respectively to obtain saccharic acid solution of xylose and glucose and performing in-situ polycondensation and carbonization on the saccharic acid solution. The preparation method particular comprises the following steps of: hydrolyzing the biomass by using dilute acid at a certain concentration; filtering to obtain xylosic acid solution and filter residues; adjusting the concentration of the saccharic acid solution and performing polycondensation and carbonization to prepare the colloidal carbon ball with grain size of 160 to 1,800 nm; performing alkali boiling on the residues to remove lignin; performing hydrolysis reaction on the residues and the concentrated sulfuric acid; filtering to obtain acid solution of the glucose; and performing in-situ polycondensation and carbonization to prepare the colloidal carbon ball with grain size of 180 to 2,000 nm. The method for preparing the colloidal carbon from the biomass is a green production route of sustainable development.

The present invention provides a preparation method of an uniform-size nanoparticle fluorescent microsphere. The density of fluorescent nanoparticle colloidal aqueous solution of the microsphere is adjusted to the micro-mol level so as to obtain the colloidal solution evenly scattered in the aqueous solution; the evenly scattered colloidal solution in the aqueous solution is injected into oil-phase solvent through capillary at the speed of 0.5 to 1.25 percent Vs/min so as to form droplets and Vs is the volume of the oil-phase solvent; the oil-phase solvent adopts bi- or multi-mixture with the solubility between 2 to 10 percent and the density equal to the density of water; containers and reflux pipes adopt the hydrophobic material; the water in droplets is absorbed by the oil phase and the nanoparticles form a dense sphere; an absorbent continuously absorbs the water dissolved in the oil phase, so that the water content in the oil phase is far lower than the saturation; the nanoparticle polymer with the size from dozens of nano to hundreds of nano, the spherical height higher than 5 percent and the size error less than 10 percent is obtained through regulating the density of the quantum pot colloidal solution and the velocity of the reflux pipe.

Oilfield completion, drilling, produced, flowback, and workover fluids containing iron are treated to remove the iron by passing them through a cavitation device together with an oxidizing agent and with the addition of lime. The cavitation device intimately mixes the oxidizing agent with the fluid while increasing the temperature of the fluid, thus promoting the oxidation reaction. Lime contributes to an increase in pH while promoting the formation of floc. Ferric hydrate and other solids or colloidal iron are removed in a filter capable of removing particles as small as 0.5 micron. The system may be enhanced by the addition of a bed of activated carbon capable of catalyzing the oxidation reaction.

The invention provides an immuno-chromatography kit for quickly and quantitatively detecting calprotectin in excrement and belongs to the technical field of clinical in-vitro diagnosis reagents. The kit includes: a test strip, which includes a substrate, and a sample pad, a marker combination pad, a nitrocellulose membrane and a water absorption pad which are all arranged on the substrate. The marker combination pad is coated with a calprotectin monoclonal antibody A marked by colloidal gold particles, colloidal silver particles, colloidal iron particles, magnetic particles, fuel particles, latex particles or fluorescent particles. The nitrocellulose membrane contains a detection line T and a quality control line C, wherein the detection line T is formed by a calprotectin monoclonal antibody B, and the quality control line C is formed by goat-anti-mouse IgG. The calprotectin monoclonal antibody A and the calprotectin monoclonal antibody B respectively recognize different epitopes of the calprotectin. The kit is convenient and quick, is simple in operation, has accurate result and is suitable for clinical quick detection.

The invention discloses a preparation method of nanometer yttrium stabilized zirconia powder. The preparation method comprises mixing zirconium oxychloride, yttrium oxide and deionized water accordingto a mass ratio of (50-60): (0.8-1): (10-12), heating the mixture to 90-110 DEG C, carrying out heat preservation for 1-3h, adding plant gum into the mixture, then adding at least one of ethylenediaminetetraacetic acid or citric acid into the mixture, carrying out stirring for 3-5h to obtain a colloidal solution, adding an ammonia solution into the colloidal solution along with stirring for 8-10huntil pH of 10.0-11.0 so that white precipitates are produced, standing the white precipitates for aging for 24-48h, washing and filtering the precipitates, carrying out spray drying and fluid energymilling to obtain precursor powder, and calcining the precursor powder at 450-600 DEG C for 5-7h to obtain the nanometer yttrium stabilized zirconia powder. The zirconia powder has a high sintering shrinkage rate, high sintering density, good strength, good performances, small particle size and narrow distribution.

A filtering method is directed to a wastewater of CMP process, which includes sub-micrometer particles suspended as colloid. The wastewater is filtered by a gel membrane formed on a surface of plastic filter. A coagulant or a pH adjuster is added to the wastewater so that the sub-micrometer particles are coagulated to form the gel membrane.

A process for preparing the CuCe/FeCrAl catalyst includes such steps as washing FeCrAl carrier with acetone, oxidizing, immersing it in gamma-Al2O3 sol, drying, calcining, quickly putting it in the colloidal solution prepared from copper nitrate, cerium nitrate and citric acid, and calcining.

The invention provides a composite antisludging agent of a reverse osmosis/nanofiltration system. The composite antisludging agent comprises the following components in percentage by weight: 2%-10% of cyclodextrin solution, namely a component I, 80%-90% of at least one or a mixture of amino trimethylene phosphonic acid (ATMP), a copolymer of maleic anhydride-acrylic acid (MA-AA), 2-phosphonic acid butane-1, 2,4-tricarboxylic acid (PBTCA), and hydroxyl ethylidene diphosphonic acid (HEDP), namely a component II, and 1%-10% of 2,2-dibromo-2-cyano-acetamid (DBNPA), namely a component III. The composite antisludging agent is prepared by mixing the component II and the component III, and then fusing the obtained mixture with the component I. When being applied to the reverse osmosis/nanofiltration/ultrafiltration system, the composite antisludging agent can be used for effectively relieving the pollution to the reverse osmosis/nanofiltration/ultrafiltration system caused by polcard, calcium sulphate salt, barium sulfate, strontium sulfate, calcium fluoride, colloidal iron and colloidal silica, relieving biological contamination simultaneously, improving the working efficiency of the system, prolonging the cleaning period and the service life of the reverse osmosis/nanofiltration/ultrafiltration system, and reducing the cost of reverse osmosis.

Oilfield completion, drilling and workover fluids containing iron are treated to remove the iron by passing them through a cavitation device together with an oxidizing agent. The cavitation device intimately mixes the oxidizing agent with the fluid while increasing the temperature of the fluid, thus promoting the oxidation reaction. Ferric hydrate and other solids or colloidal iron are removed in a filter capable of removing particles as small as 0.5 micron. The system may be enhanced by the addition of a bed of activated carbon capable of catalyzing the oxidation reaction.

The invention relates to a preparation process for nano zirconia powder. The preparation process comprises the steps of adding an alkaline precipitating agent in a zircon salt-containing aqueous solution to obtain a hydroxide precipitate; and then filtering, washing, dehydrating, drying and sintering to obtain zirconia powder. A colloidal solution obtained by dehydration with an azeotropic distillation method is dried in a distillation apparatus; and the colloidal solution is continuously stirred during dehydration and drying. The preparation process has the advantages of short reaction time, few procedures, large production capacity and high security, is suitable for large-scale production and can greatly reduce production cost.

This invention discloses a method for producing nanometer transition metal oxide. The procedures comprise: solubilise the melting transition metal salt in the mixture of hydrocarbon component and surfactantto form the molten salt-in-oil super solubilising colloidal group, which limits the transition metal hydroxide generated by the reaction of molten salt and precipitant in the colloidal group, so as to avoid the increase of particle size and narrow the particle size distribution range. and then obtain the nanometer transition metal oxide by cleaning, drying and burning. This invention is characterized of high yield and purity,with low cost of surfactant and hydrocarbon component. Besides, the process is simple and is adapted for industrial mass production.

The invention belongs to the technical field of electrochemistry and relates to a preparation method of a coating type ferrous sulfide/carbon composite, in particular to a preparation method of a coating type nickel-doped ferrous sulfide/carbon composite electrode. The preparation method comprises the steps that firstly, a tannic acid aqueous solution and a ferric nitrate aqueous solution are respectively prepared, and the ferric nitrate aqueous solution is dropwise added to the tannic acid aqueous solution under the condition of stirring at the normal temperature, so that a colloidal solution is formed; secondly, hydrazine hydrate is added to a nickel chloride hexahydrate aqueous solution, and the obtained mixed solution is dropwise added to the colloidal solution and evenly mixed with the colloidal solution; a substrate material is soaked in the mixed system to obtain a precursor, after being taken out, the precursor together with sulfur powder is calcinated in the inert gas shielding atmosphere for 0.5-2 h, and the coating type nickel-doped ferrous sulfide/carbon composite electrode is obtained after cooling. By the adoption of the preparation method of the coating type nickel-doped ferrous sulfide/carbon composite electrode, operation is simple and easy to conduct, multiple kinds of substrates can be coated, the reaction time is short, and industrialization is easy; the prepared composite electrode has good electrochemical performance and stability, raw materials are at a low price, easy to obtain and free of toxicity, the prepared composite electrode can be directly used as the electrode for an electro-catalytic water decomposition oxygen evolution reaction; and when the current density is 10 mA.cm<-2>, the overpotential reaches 320 mV, and the Tafel slope is 43 mV.dec<-1>.

Polysaccharides can be used to provide a liquid composition with desirable rheological properties while being compatible with other ingredients, such as enzymes, that may be used in formulating the liquid composition. The polysaccharides can be i) a colloidal dispersion of poly alpha-1,3-glucan, ii) poly alpha-1,3-glucan fibrids, iii) soy polysaccharide; or iv) a combination thereof.

The invention relates to a preparation method of graphene quantum dots. The preparation method comprises the following steps: taking zinc oxide adopting a hexagonal crystal structure and having the grain diameter of 5 nm to 30 nm as a seed crystal nucleus; adding single-layer graphene oxide into solvent to prepare graphene oxide dispersion liquid, adding zinc oxide adopting a hexagonal crystal structure, then adding a stabilizer, and uniformly dispersing to obtain a colloidal solution; performing hydrothermal reaction on the colloidal solution for 0.5 h to 2 h at 160 DEG C to 300 DEG C to obtain turbid liquid containing graphene quantum dots; adding acid to the turbid liquid containing graphene quantum dots to clarify the turbid liquid containing graphene quantum dots, filtering, regulating the pH value of the filter liquor to be 7 to 8, stirring and filtering to obtain a solution containing graphene quantum dots; extracting the solution containing graphene quantum dots, and evaporating to remove an extractant so as to obtain graphene quantum dots. The method is relatively simple in technology and can be used for preparing graphene quantum dots which are narrower in size distribution.

The invention discloses Au@AuPt alloy nanoparticles and a preparation method of a colloidal dispersion system, and particularly provides nanoparticles having a preparation method and a controllable reaction process and a preparation method of a colloidal dispersion system. The method comprises the following steps: preparing a system A: the system A contains a dispersion reagent, a gold precursor, a platinum precursor and a protective agent, wherein the protective agent is sodium di-n-octyl sulfosuccinate, the gold precursor is HAuCl4, NaAuCl4 or AuCl3, and the platinum precursor is H2PtCl6 or Na2PtCl6; at room temperature, adding a reducer A into the system A while stirring to reduce part of the gold precursor, adding a reducer B, and continuing stirring at room temperature until the reaction is complete, thereby obtaining the core-shell-structure Au@AuPt alloy nanoparticles, wherein the reducer A is ascorbic acid, and the reducer B is a hydrazine hydrate water solution; and adding ethanol or methanol into the reaction system, carrying out centrifugal settling, taking the precipitate, and washing the precipitate to obtain the core-shell-structure Au@AuPt alloy nanoparticle powder. The method has the advantages of simple preparation technique and low energy consumption.

The present invention relates to a polyamic acid solution composition, which is obtained by reacting a tetracarboxylic acid component comprising at least 50 mol% of a fluorine atom-containing tetracarboxylic dianhydride and a diamine component comprising at least 50 mol% of a fluorine atom-containing diamine in a solvent and adding to the resulting polyamic acid solution a colloidal solution of colloidal silica dispersed in an organic solvent such that the amount of the silica is 1 to 100 parts by mass per a total of 100 parts by mass of the tetracarboxylic acid component and the diamine component.

Disclosed is a catalyst application solution for plating an insulating portion of an object to be plated that comprises the insulating portion. The catalyst application solution is characterized by containing a water-soluble palladium compound, a reducer, a dispersant, catechol, a copper antioxidant and a buffering agent, and by having a pH of not less than 4. When the catalyst application solution is compared with a Pd—Sn colloidal solution, the catalyst application solution has the following advantages: since the catalyst application solution is a colloidal solution of Pd only that does not contain Sn, a pre-dip process and an Sn removal process are unnecessary and thus the catalyst application process can be simplified; since the catalyst application solution has a pH of not less than 4, haloing does not occur; and since the catalyst application solution is in a reducing atmosphere due to the reducer contained therein, a copper surface is not oxidized and no copper dissolution occurs, thereby causing no palladium displacement reaction.

The invention provides a photochemical preparation method for a Pd core @Pt shell nanometer catalyst and relates to a preparation method for a catalyst. The preparation method comprises the following steps: taking and mixing PdCl2 aqueous solution, polyethylene glycol and acetone aqueous solution, thereby obtaining a mixed solution a; taking and mixing H2PtCl6 aqueous solution, polyethylene glycol and acetone aqueous solution, thereby obtaining a mixed solution b; irradiating the mixed solution a by adopting ultraviolet rays, thereby obtaining a nanometer Pd colloidal solution c; mixing the solution c with the mixed solution b, thereby obtaining a mixed solution d; irradiating the mixed solution d by adopting the ultraviolet rays, thereby obtaining a Pd core @Pt shell nanometer colloidal solution e; and under the condition of the colloidal solution e obtained through stirring, immersing a carbon carrier for 2-24h, leaching and washing with de-ionized water till no chlorine exists, thereby obtaining the Pd core @Pt shell nanometer catalyst. The catalyst nanometer grain obtained according to the technology has a core-shell compound structure; the size of the grain is easily controlled and the monodispersity is excellent; and the preparation method is widely applied to the field of low-temperature fuel cells.

The invention discloses a preparation process of a lithium iron phosphate material. The process includes the following steps of: step 1: formulating lithium salt solution containing dispersant polyoxyethylene; step 2: putting ferric orthophosphate into the formulated lithium salt solution step by step, continuously stirring the mixed solution to fully react, mix and form colloidal solution in which the total mol rate of lithium to iron is 1.05-1.0; step 3: adding carbon source to the prepared colloidal solution with the adding amount being 20-40g/mol (Li), and drying after uniform mixing; and step 4: sintering the dried material of step 3 under the protection of nitrogen and preparing the finished product of lithium iron phosphate. After being ground and sieved, the lithium iron phosphate material produced by using the preparation process has the carbon content of 3.8-5.2%, compact density of 1.0-1.3g/mL and testing volume up to 150-160mA/h (0.2C). The volume is improved by over 15% compared with that of a solid ball milling method.