468 results about "Potassium ferricyanide" patented technology

Novel slurries for the chemical mechanical polishing of thin films used in integrated circuit manufacturing. A tungsten slurry of the present invention comprises an oxidizing agent, such as potassium ferricyanide, an abrasive such as silica, and has a pH between two and four. The tungsten slurry of the present invention can be used in a chemical mechanical planarization process to polish back a blanket deposited tungsten film to form plugs or vias. The tungsten slurry can also be used to polish copper, tungsten silicide, and titanium nitride. A second slurry, which is a 9:1 dilution of the tungsten slurry is ideal for chemical mechanical polishing of titanium nitride films. A third slurry of the present invention comprises a fluoride salt, an abrasive such as silica and has a pH</=8. The third slurry can be used to polish titanium films.

The invention discloses a positive electrode material for a potassium ion battery and a preparation method thereof, and the potassium ion battery. The positive electrode material has a chemical formula of K<x>P[R(CN)<6>], wherein x is no less than 0 and no more than 2, P is a transition metal ion, and R is Fe<2+> or Fe<3+>. The preparation method comprises the following steps: dissolving potassium ferricyanide or potassium ferrocyanide and a transition metal salt to prepare a uniform solution; then carrying out a hydrothermal reaction; separating a precipitate produced in the hydrothermal reaction; and carrying out washing and vacuum drying so as to obtain the positive electrode material. The preparation method in the invention is simple in process, easy to operate, low in cost for required raw materials and suitable for large-scale industrial production. The prepared positive electrode material has an open three-dimensional network frame structure, and great interstitial sites allow potassium ions to shuttle and to be stored, so the potassium ion battery assembled from the positive electrode material has high discharge capacity, long cycle life, and high energy density and power density.

The invention discloses a preparation method and application of a hollow Prussian-blue nanometer cube. The preparation method for the hollow Prussian-blue nanometer cube comprises the following steps: step 1, heating polyvinylpyrrolidone hydrochloric acid solution containing potassium ferricyanide and preparing a Prussian-blue nanometer cube of a solid structure by using a slow chemical aging method; and step 2, dispersing the Prussian-blue nanometer cube prepared in the step 1 and polyvinylpyrrolidone in a hydrochloric acid solution at the same time, carrying out a hydrothermal reaction and then carrying out centrifugation, washing and drying so as to obtain the hollow Prussian-blue nanometer cube. According to the invention, the uniform cubic morphology of the prepared Prussian-blue nanometer material is guaranteed by using the slow chemical aging method and controllable acid etching under hydro-thermal conditions is carried out, so Prussian-blue forms a unique hollow cubic morphology; and thus, catalytic activity of the material is improved. The prepared hollow Prussian-blue nanometer cube shows excellent electrochemical catalysis response in application to a hydrogen peroxide sensor.

The invention relates to a method for quickly determining the content of additive of a plurality of types in food. An adopted technical scheme is as follows: a solid sample is accurately weighed into a centrifuge tube, petroleum ether or n-hexane is additionally arranged to become homogenate, and supernatant fluid is removed by centrifugation; after the petroleum ether or the n-hexane in the residue are volatilized, the mixed solvent of ethanol, ammonia and water is additionally arranged, ultrasonic extraction is carried out, and the supernatant fluid is obtained by centrifugation as sample liquid for testing; the sample liquid for testing is adopted, potassium ferrocyanide solution and zinc acetate solution are additionally arranged, the mixture is mixed uniformly and centrifuged; the supernatant fluid is concentrated in water bath at 60DEG C to 100DEG C; concentrated solution is transferred to a measuring flask with water; the pH value is regulated to 5 to 7, water is additionally arranged to fix the capacity to a scale; the mixture is mixed uniformly, is filtered by a 0.45mum microfiltration membrane and arranged in a sample bottle as sample liquid; and the sample liquid is tested in a liquid chromatograph by gradient elution under variable wavelengths. According to the invention, the method for quickly determining the content of additive of a plurality of types in food is simple and easy, has high precision, high accuracy, high sensitivity, has the recovery rate being above 80 percent, and is used for determining the content of additive of a plurality of types in food at the same time.

The invention discloses prussian blue nano-scale hollow olivary microballoons, and belongs to the technical field of prussian blue materials. A preparation method of the prussian blue nano-scale hollow olivary microballoons comprises the following steps that 1, acrylamide as a monomer, N,N'-methylenebisacrylamide as a cross-linking agent, ammonium persulfate as an initiator and ethanol as a solvent are prepared into crosslinked polyacrylamide hydrogel microballoons by a dispersion polymerization technology; 2, hydrogel microballoon/ethanol suspending liquid is added with a Fe<3+> salt aqueoussolution; 3 the mixed solution obtained by the step 2 is stirred violently for one night so that the crosslinked polyacrylamide hydrogel microballoons swelled by Fe<3+> deform; 4, a potassium ferrocyanide aqueous solution is added dropwisely into the mixed solution treated by the step 3 to form prussian blue shells; and 5, the solvent is removed so that the prussian blue nano-scale hollow olivarymicroballoons are obtained. The preparation method of the prussian blue nano-scale hollow olivary microballoons has the advantages of simple operation, low cost, good adaptability for large-scale production, and controllability of microballoon sizes. The prussian blue nano-scale hollow olivary microballoons have nano-scale short axis sizes and micron-scale long axis sizes, and can be utilized widely for drug slow release, sensors, electrode materials and the like.

The invention relates to a method for modifying lignin in an eutectic solvent chloro choline chloride/urea through quaternization. The method comprises steps of firstly, preparing the eutectic solvent; secondly, purifying the lignin; thirdly, dissolving the lignin in the eutectic solvent, adding a catalyst for quaterisation; and fourthly, after cooling down the reactant, adding an excess potassium ferricyanide water solution, filtering, washing, and drying so as to obtain the lignin modified through quaternization. The eutectic solvent is used as both the solvent and reagent for quaterisation so as to modify the lignin and is non-toxic and harmless compared with traditional quaterisation. The lignin modified through quaternization can be used as functional materials such as flocculating agent, surfactant, emulgator, oil-displacing agent, water reducer and the like.

The invention discloses a low chromium anticorrosive chemical conversion treating fluid on the surface of constructive aluminium profile and a use method thereof; the technology comprises placing constructive aluminium profile in a tank liquor to treat with a pH value of 1.8-2.2 at 5-40 DEG C for 3-5min or 0.5-1.5min to form a layer of compact and uniform golden to irisated chromate conversion film with a film thickness of 1-2mu m on the surface of the constructive aluminium profile; wherein, the tank liquor comprises 0.6-2.0g/L of chromate, 0.3-0.9g/L of fluorine compound, 0.1-0.6g/L of zinc salt, 0.2-0.8g/L of nitrate, 0.1-0.5g/L of salts from rare earth metals and 0.3-1.0g/L of stabilizer. The invention has simple process and contains no potassium ferricyanide and low chromate; the solution is stable with little sediment; the service cycle is long; the cost of environment pollution and wastewater treatment is low; the treated waste solution can meet the relative discharge standards and the invention has other advantages of room temperature use, energy saving, low comprehensive cost and the like.

The invention relates to an edging cube-shaped cobalt-iron prussian blue nanometer material and a preparation method thereof. The preparation method comprises the following steps of firstly, stirring and dissolving a surfactant into water under the magnetic action; after dissolving, sequentially adding sodium citrate and cobalt salt to prepare a solution A; then, dissolving potassium ferricyanide solid into water to prepare a solution B; gradually dripping the solution A into the solution B while stirring; after dripping, continuing to stir for a period of time; standing and aging the reaction liquid for a period of time, naturally cooling, centrifuging, washing, and drying, so as to obtain the edging cube-shaped cobalt-iron prussian blue nanometer material. Compared with the prior art, the synthesizing method has the advantages that by changing the conditions, the edging cube-shaped cobalt-iron prussian blue nanometer material is prepared; the morphology and structure of the material are not reported in the literature; the preparation is simple, the implementing is easy, and the large-batch preparation effect is realized.

The invention provides preparation of a Prussian blue photo-Fenton catalyst; ferric trichloride, ferric nitrate, ferric sulfate or ammonium ferrous sulfate, potassium ferricyanide, and potassium ferrocyanide are used as raw materials, and are dissolved in ultrapure water respectively to prepare a solution containing iron ions and ferricyanide ions; molecular sieve, kaolin or construction waste are used as carriers, and Prussian blue is fixed on the carriers to obtain fixed Prussian blue photo-Fenton catalyst. The invention also provides a method for degrading organic pollutants by the Prussian blue photo-Fenton catalyst, which comprises mixing of the prepared photo-Fenton catalyst with hydrogen peroxide under a light condition to degrade organic simulated pollutants. The method of the invention is simple and practical; the catalyst is suitable for recycle, can both effectively remove chroma of polluted water, and reduce COD of the polluted water.

The invention relates to a method for manufacturing an asymmetric super capacitor with a solid phase electrode material and liquid phase electrolyte which provide capacitance at the same time. The super capacitor has superhigh energy density, power density and circulating stability. The positive electrode is made of a cobaltous hydroxide/graphene composite electrode material, and the electrolyte is the mixed electrolyte of potassium hydroxide/potassium ferricyanide. The negative electrode is made of an activated carbon/carbon fiber paper electrode material, and the electrolyte is the mixed electrolyte of potassium hydroxide/p-phenylenediamine. The solid phase electrode material and liquid phase electrolyte synchronously and independently provide the capacitance. The asymmetric super capacitor can have high energy density, power density and circulating density under the high charging and discharging density. The energy density is 124.4 Wh/kg under the 2A/g charging and discharging current density, the corresponding power density is 2,000 W/kg, and specific capacitance of the capacitor hardly attenuates after 20,000 times of circulation.

The invention provides detection liquid for detecting the corrosion resistance of a surface passivation film of a tinned steel plate. The detection liquid comprises the following component in parts by total weight: 0.1-5 parts of inorganic acid, 0.01-5 parts of organic acid, 0.1-5 parts of an oxidant, 0.05-2.5 parts of a complexing agent and 82-100 parts of water, wherein the inorganic acid is one or more of hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid; the organic acid is one or more of lactic acid, citric acid and glycolic acid; the oxidant is ferric trichloride and/or copper chloride; the complexing agent is potassium ferricyanide. The invention further provides a method for detecting the corrosion resistance of the surface passivation film of the tinned steel plate. According to the scheme provided by the invention, the intensity of the corrosion resistance of the surface passivation film of the tinned steel plate can be intuitively and accurately evaluated according to the color change of the detection liquid dropwise added onto the surface passivation film of the tinned steel plate and/or the change of state of corrosion points on the surface passivation film.

The invention discloses a detection kit for determining the content of creatinine in serum by an enzymic method. The detection kit comprises a reagent R1 and a reagent R2, wherein the reagent R1 contains 3-10g/L of buffering solution with the pH value being 7.5-8.0, 0.2-0.5g/L of EDTA, 0.5-2g/L of N-ethyl-N-(2-hydroxyl-3-sulfopropyl) m-toluidine sodium salt, 1 per mill-5 per mill of a surface active agent, 0.2-1g/L of sarcosine oxidase, 1-5KU/L of ascorbate oxidase, 2-5KU/L of creatinase and 0.5-1g/L of a stabilizing agent; the reagent R2 contains 3-10g/L of buffering solution with the pH value being 7.5-8.0, 0.1-0.5g/L of 4-aminoantipyrine, 0.1-0.4g/L of potassium ferricyanide, 2-8g/L of creatininase amidohydrolase, 1-6KU/L of peroxidase and 0.5-2g/L of a preservative. The detection kit disclosed by the invention is excellent in stability, strong in interference resistance and high in clinical application value.

The invention discloses a preparation method of a transition metal oxide/sulfide nano composite material. The preparation method includes: adopting a room-temperature standing method to combine cobalt and nickel transition metal ions with potassium ferricyanide organic ligand to prepare a Prussian blue derivative nanocube; adding sodium sulfide into a water solution for vulcanization reaction to obtain a Prussian blue derivative nanocube with a vulcanized shell; calcining to obtain a MOF-based transition metal oxide/sulfide nanocube composite material with a core-shell structure. The transition metal oxide/sulfide nanocube composite material prepared by the method breaks through limitation that most structures of conventional MOF-based composite materials are simple spherical hollow structures, and structure of the composite material is a nanocube with the core-shell structure, so that size is uniform; the composite material has wide applicability in preparation methods of MOF-based transition metal compounds and has great application prospect in the field of supercapacitors and lithium ion batteries.

The invention discloses a method for rapid determination of the content of selenium in a soil sample. According to the invention, hydride generation-atomic fluorescence spectroscopy and a standard curve method are utilized; mixed acid is used, the mixed acid has powerful oxidation capability and does not need cold digestion or stay overnight, and hot digestion time can be shortened at a certain temperature, thereby substantially shortening a detection period. A standard curve can be directly prepared by using a national selenium standard solution, operation is simple, accuracy is high, and a good linear relation is obtained. Since atomic fluorescence spectroscopy has the characteristic of strong anti-interference capability, potassium ferricyanide has a weak effect on shielding interference of other elements and almost exerts no influence on detection results, so it is of no need to use the reagent of potassium ferricyanide, thereby reducing usage amount of reagents and enabling steps of the method to be simpler and operation to be easier.

The invention relates to a method for preparing a steroid immunosensor based on sheet black phosphorus and application and belongs to the technical field of novel biosensing and detection. The sheet black phosphorus is provided with a structure having the property similar to graphene and has good conductivity. Ionic liquid serves as a dispersing agent of the sheet black phosphorus and is applied to a base of the immunosensor. A porous PtAu alloy film is utilized to firm combine a base layer material and an antibody, and the stability of the sensor is enhanced. Base solution potassium ferricyanide is utilized as signals, and ultrasensitive detection of steroid is performed.

A dry reagent composition that includes an active redox enzyme that oxidizes an analyte as a specific substrate to produce an inactive reduced form of the enzyme; and a salt of ferricyanide provides improved performance in electrochemical test strips such as those used for detection of glucose. The salt of ferricyanide consists of ferricyanide and positively-charged counter ions, and the positively charged counter ions are selected such that the salt of ferricyanide is soluble in water, and such that the salt of ferricyanide or the crystalline phase of the salt of ferricyanide has a solubility in water and/or a lower E⁰_eff at a concentration of 100 mM than potassium ferricyanide. For example, the salt of ferricyanide may be tetramethylammonium ferricyanide.

The invention discloses a preparation method of a hollow Ni2P/Co2P/Fe2P nano-composite electrocatalyst. The method comprises the following steps: preparing a nickel-cobalt precursor, used as a template, by using nickel acetate, cobalt acetate and polyvinylpyrrolidone as reaction materials and ethanol as a reaction solvent, adding potassium ferricyanide, and preparing a hollow Prussian blue analogthrough room temperature stirring by using ethanol and water as reaction solvents; and phosphating PBA in a tubular furnace at a low temperature with sodium hypophosphite as a phosphorus source to prepare the hollow Ni2P/Co2P/Fe2P nano-composite material. The hollow Ni2P/Co2P/Fe2P nano-composite electrocatalyst prepared in the invention has the advantages of high repeatability, simple and high preparation process, and superior catalytic activity and stability in electrocatalytic oxygen evolution reactions.

The invention discloses a synthesis method and application method of manganese Prussian blue material for a lithium ion battery, and belongs to the preparation and application method of the manganesePrussian blue material. The synthesis method comprises the following steps: selecting a manganese source from anhydrous manganese chloride (MnCl2) or manganese chloride monohydrate (MnCl2.H2O); selecting an iron source and cyanogen from potassium ferricyanide (K3[Fe(CN)6]); selecting a chelating agent from anhydrous sodium citrate or sodium citrate dihydrate; weighing the manganese source and theclelating agent in mass ratio of x: 1, and dissolving into a mixed solution with the methyl alcohol and deionized water in any proportion to prepare a solution A; dissolving the potassium ferricyanideinto the deionized water to prepare the solution B with the concentration of 0.04mol/L; pouring the solution B into the solution A, uniformly mixing to acquire the solution C, standing for 6-24h at the room temperature, and separating, purifying and drying to obtain a target product. The synthesis method disclosed by the invention has the advantages that the raw material is easy to obtain, the synthesis method is simple, the operation step is high in controllability, the obtained product is high in purity, and uniform in particle size; and the structure is a hollow cube and easy to prepare ina large-scale manner. The manganese Prussian blue material disclosed by the invention is served as the lithium ion battery negative material, and is excellent in electrochemical performance.

The invention discloses a degradable high-strength temporary blocking agent which is prepared from a viscosity change promoting agent, an adhesive, acrylamide, a potassium ferricyanide solution, a cross-linking agent, ammonium persulfate, sodium hydroxide and water. A preparation method of the temporary blocking agent comprises the following steps: firstly adding the viscosity change promoting agent, the adhesive and the acrylamide into water, and uniformly mixing the viscosity change promoting agent, the adhesive and acrylamide with the water; then adding the potassium ferricyanide, the cross-linking agent and the ammonium persulfate, uniformly stirring the potassium ferricyanide, the cross-linking agent and the ammonium persulfate with the solution, then dropwise adding the sodium hydroxide, and fully stirring sodium hydroxide with the solution; finally performing a temperature-increasing reaction, so as to obtain a finished product. The degradable high-strength temporary blocking agent and the preparation method have the obvious effects that a non-newtonian fluid characteristic of shear thinning is achieved; after stilling is finished, the system viscosity is rapidly improved, i.e., a characteristic of rapidly enhancing the structure is achieved, and assistance is provided for improving the system strength by virtue of the cross-linking agent; a temporary blocking agent material distributed in the degradable high-strength temporary blocking agent achieves a gelatination effect at a reservoir temperature, so that the system strength is improved, and a high-strength gel slug is formed; an effect of a chemical packer is achieved, and a water layer is blocked or injection of a plugging agent for a subsequent stratum is assisted; furthermore, after blockage is finished, automatic gel breaking can be achieved, so that the permeability of the stratum is restored.

The invention provides a preparation method of a sawtooth-like nickel-cobalt-iron PBA (prussian blue analogue) sintered oxide nanomaterial, and belongs to the technical field of materials. The preparation method comprises the following steps: a cubic-structured nanometer nickel-cobalt-iron PBA precursor is synthesized from nickel nitrate hexahydrate, trisodium citrate trihydrate, potassium ferricyanide and potassium hexacyanocobaltate(III); an ammonia water solution is used for corrosion, centrifugal separation is performed, a sample is washed and dried, a sawtooth-like nickel-cobalt-iron PBAnanomaterial is obtained and sintered, and a 'Z'-Ox nanomaterial is obtained. The 'Z'-Ox nanomaterial can effectively catalyze peroxymonosulfate to generate hydroxyl radicals and sulfate radicals, andaccordingly, bisphenol A is degraded. The position of corrosion is determined by uneven distribution of metal coordination bonds in the precursor, anisotropic corrosion is formed, and a new way is opened up for fine adjustment of the structure and properties of an MOF material; the method has the characteristics of being simple to operate, short in preparation period, high in economic benefit andsuitable for large-scale production.

The invention relates to a high-performance super-capacitor electrode material Co-Fe type prussian blue nano cube as well as a preparation method and application thereof, and belongs to the technical field of electrode material preparation. According to the preparation method, inorganic cobalt salt and potassium ferricyanide are adopted as reaction raw materials, trisodium citrate is adopted as a complexing stabilizer, a liquid-phase precipitation reaction method is implemented, reaction conditions such as the use amount and the stand aging time of potassium ferricyanide are controlled, a Co-Fe type prussian blue nano cube material with good dispersibility and large specific area is prepared, and the size of the material is about 300nm. By adopting the Co-Fe type prussian blue nano cube material provided by the invention, the capacity of an electrochemical electric container is increased, properties such as the rapid charge and discharge property and the service life of the electric container are improved, the capacitance of the electric container is as high as 447F/g in constant current charge and discharge of 5A/g in a 1mol/L sodium sulfate solution, and the good rate capability is achieved.

The invention relates to an aqueous polyaniline hollow microballoon and preparation method thereof, which belongs to the field of the polyaniline material technology, and solves the technical problem that the polyaniline hollow microballoon in prior art can not be dissolved in water, and only dissolves in a poisonous and harmful volatile organic solvent when used with environment pollution. The preparation method of the aqueous polyaniline hollow microballoon includes the following steps: a step a), dissolving aniline and sulfonic aniline in water and obtaining an aqueous dispersion liquid; a step b), dissolving potassium ferricyanide in water and obtaining a potassium ferricyanide aqueous solution; a step c) mixing the aqueous dispersion liquid and the potassium ferricyanide aqueous solution for reaction, and obtaining the reaction products by filtering; a step d), drying the obtained reaction products from the step c), and obtaining the aqueous polyaniline hollow microballoon. The preparation method of the present invention has the advantages of simple method and low cost, and the prepared aqueous polyaniline hollow microballoon has excellent water dispersability, and can be dissolved in water for obtaining an aqueous polyaniline solution.

The invention belongs to a measuring method of divalent cobalt content in lithium cobalt oxide in the metallic ion quantitative detection field; the measuring method is characterized in that: total cobalt content and trivalent cobalt ion content in the lithium cobalt oxide are respectively measured, and then the total cobalt content subtracts the trivalent cobalt ion content for obtaining the divalent cobalt content in lithium cobalt oxide; wherein, the measuring method of the total cobalt content in the lithium cobalt oxide adopts ethylenediamine tetraacetic acid (EDTA) chelatometrie volumetric method, an iodometry method or a potassium ferricyanide oxidimetry method, and the measuring method of the trivalent cobalt ion content in the lithium cobalt oxide adopts an ammonium ferrous sulfate oxidimetry method. The measuring method in the invention makes up the disadvantage that the prior art has no measuring method of divalent cobalt content in lithium cobalt oxide and provides a measuring method of divalent cobalt content in lithium cobalt oxide in the metallic, wherein the method has simple operation, easy judgment of a finishing point and accurate measuring result, thereby providing powerful reference for judging the purity of the lithium cobalt oxide products and ensuring the lithium cobalt oxide products to have good electro-chemical performance.

The invention belongs to the technical field of medical preparations containing radioactive substances, in particular to a palladium-103 and io-125 compound sealed seed source, a source core and a source core preparation method. A palladium-103 and io-125 compound film covers on a carrier to form the source core, and the palladium-103 and io-125 compound sealed seed source is prepared in a way that the source core is welded and sealed in a titanium pipe or titanium alloy pipe. The source core preparation method of the palladium-103 and io-125 compound sealed seed source comprises the steps of: 1, inoculating a nano palladium seed crystal: dipping a carrier bar into a chloroform solution of palladium diacetate, and then dipping into an alkaline ammonia solution of hydrazine; 2, carrying out chemical plating on palladium-103 and silver: putting the carrier bar into a mixed solution of palladium chloride, silver nitrate, ethylene diamine tetraacetic acid, ammonium hydroxide and hydrazine to enable the surface of a carrier to be uniformly coated with a layer of palladium-103 and silver; and 3, carrying out chemical absorption of iodine-125: putting the carrier bar into a mixed solution of sodium bromide or potassium bromide, sodium iodide or potassium iodide, sodium hydroxide or potassium hydroxide, and potassium ferricyanide.

The invention discloses a sodium nitroprusside-conjugated medicine-carrying prussian blue analogue nano-photothermal therapeutic agent and a preparation method thereof. The particle size of the sodiumnitroprusside-conjugated medicine-carrying prussian blue analogue nano-photothermal therapeutic agent prepared by a hydrothermal reaction method is 205.4nm, and passive targeting can be achieved by means of an enhanced permeability and retention (EPR) effect of a tumor site. Under the illumination of near-infrared laser, the nano-photothermal therapeutic agent can not only induce photothermal ablation of tumor cells through excellent photothermal conversion efficiency, but also can control NO release, thereby improving the EPR effect and increasing intratumoral delivery of nanoparticles. Furthermore, the NO can also inhibit tumor progression by inducing apoptosis of the tumor cells, preventing angiogenesis, reversing multidrug resistance, and the like. On the other hand, due to the structural difference between sodium nitroprusside and potassium ferricyanide, the lattice defects of the nanoparticles are caused, and the drug loading capacity of the nano-photothermal therapeutic agent is accordingly increased. Therefore, after chemotherapeutic drugs are carried, under the irradiation of near-infrared light, the nano-photothermal therapeutic agent can realize dose-controlled NO release and phototherapy and chemotherapy combined oncotherapy. In addition, the sodium nitroprusside-conjugated medicine-carrying prussian blue analogue nano-photothermal therapeutic agent provided by theinvention also has good photothermal stability and certain photoacoustic contrast properties.