57 results about "Osmium tetroxide" patented technology

The present invention provides a method of differentiating metallic carbon nanotubes from semiconducting carbon nanotubes. The method comprising providing a nanotube dispersion, wherein the nanotube dispersion comprises a plurality of carbon nanotubes, osmium tetroxide, or ruthenium tetroxide, and a solvent; and irradiating the nanotube dispersion with ultraviolet light, wherein the metallic carbon nanotubes are osmylated, or ruthenylated, thereby differentiating the metallic carbon nanotubes from the semiconducting carbon nanotubes.

The invention relates to a preparation method and an application of a double-rate-type (ultraviolet/fluorescence) multifunctional (calorimetric/fluorescence/ultraviolet) high-sensitivity florescent probe for carboxylesterase detection. Firstly, 2,4-dihydroxybenzaldehyde, diethyl glutaconate and anhydrous piperidine react in ethyl alcohol to produce a product 1, the product 1 and acetic anhydride react in anhydrous pyridine to produce a product 2, the product 2 reacts with osmium tetroxide and sodium periodate in tetrahydrofuran to produce a product 3, and the product 3 reacts with anhydrous potassium carbonate in methyl alcohol to produce a product 4; then methylpyridine and methyl iodide react in absolute ether to produce a product 5; next, the product 4 and the product 5 are dissolved in absolute ethanol, piperidine is added for a reaction, and a product 6 is obtained; finally, the product 6 is dissolved in acetic anhydride, anhydrous sodium acetate is added, and the double-rate-type multifunctional florescent probe for carboxylesterase detection is obtained. The probe is applicable to qualitative and quantitative analysis of carboxylesterase in biological samples, is sensitive, accurate and quick in detection, and can be applied to related fields of analytical chemistry, life organic analytical chemistry, disease pre-diagnosis, clinical medical examination and the like.

The invention discloses a method for recycling and utilizing a precious metal in an IrOsRu ore, which comprises the following process steps: 1) blending and shredding raw materials: mixing and shredding IrOsRu ore, zinc and aluminum to form raw materials; 2) performing acid leaching to remove zinc and aluminum; 3) performing alkali dissolution and water leaching: melting the filter residue with asolid base, and performing water leaching; 4) performing oxidative distillation to remove cesium: adding nitric acid to produce and absorb osmium tetroxide vapor; 5) performing recovery of ruthenium:adding sodium chlorate to produce and recycle osmium tetroxide vapor, performing concentration and crystallization by rotary evaporation to obtain ruthenium trichloride; and 6) performing purificationof hydrazine, concentration of filtrate, etc., to obtain ammonium chloroiridate precipitation, and then filtering and drying the precipitation. According to the method for recycling and utilizing precious metal in IrOsRu ore, the IrOsRu ore, zinc and aluminum are shredded at high temperature in an intermediate frequency furnace to avoid the problems of high loss and difficult filtration caused bythe use of zinc or aluminum alone. The intermediate frequency furnace is provided with mixing, so the heating is fast, the efficiency is high and the energy is saved. Toxic gases are not used, so thesafety is high. The recovery rate is improved through recycling and multiple filtration. Other metal resources can be recycled again to avoid waste.

The invention discloses a method for rapidly extracting osmium from an osmium-containing material and belongs to the technical field of noble metal metallurgy. After the osmium-containing material isdissolved by hydrochloric acid, ozone is adopted to conduct selective distillation, two-grade absorption is conducted on the osmium tetroxide obtained after distillation by means of a mixed solution of sodium hydroxide and ethyl alcohol, the pH value of a solution is adjusted, osmium black is obtained through hydrazine hydrate reduction, after calcination and hydrogen reduction, metal osmium powder is obtained. The method for rapidly extracting the osmium from the osmium-containing material guarantees that the osmium tetroxide is not reduced, improves distillation efficiency and shortens the osmium distillation time to within 8 hours. The method for rapidly extracting the osmium from the osmium-containing material has the advantages of being simple in technology, short in technological process, convenient to operate, stable in product quality and the like.

A method for evaluating the composition of an MEA for a fuel cell. The method includes soaking the MEA in an unsaturated organic compound for a predetermined period of time, and then allowing the MEA to dry. The method then includes staining the MEA with osmium tetroxide (OsO₄) in a closed container. The stained MEA is then encased in an epoxy. Thin sections of the encapsulated MEA are then prepared, and the sections are viewed through a transmission electron microscope. The stained MEA will show dark regions where the ionomer and carbon particles are located and lighter regions that are epoxy filled pores.

The present invention discloses a method of synthesizing multi-hydroxy pyrrolidine alkaloid. The present invention comprises the following steps: 1) the multi-hydroxy ring-shaped nitrone of the structure in formula II reacts to prepare Cbz-protected amide of the structure in formula III; 2) the amide of the structure in formula III is changed into an alpha, beta-unsaturated ketone of the structure IV; 3) the alpha, beta-unsaturated ketone of the structure IV and ketone do the dual-hydroxylation reaction with the influence of osmium tetroxide and NMO system to get a structure in formula V; 4) the formula V is catalyzed and hydrogenated to get the multi-hydroxy pyrrolidine alkaloid of the structure in formula I. The present invention startes from the low-cost and easily accessible raw materials; the sugar derived multi-hydroxy chiral nitrone is used as a key chiral intermediate; a set of simple, effective and practical methods of highly three-dimensional selectivity and high production rate to synthesize the multi-hydroxy pyrrolidine alkaloid of hyacinthacine C₁ category is formed through the pro-nuclear addition, Wittig reaction, double-hydroxylation and reductive amination and other reactions.

The invention belongs to the technical field of organic chemical industry and particularly relates to a catalyst for preparing glyoxylic acid from methyl glycolate, a preparation method and an application. The catalyst is a composite oxide formed of ferric oxide and osmium tetroxide, or a mixture of one or two of cobalt ferrite, wherein the molar ratio of Fe to Co is between 1:8 and 2:1. The catalyst is prepared by a solid phase grinding method, that is, iron nitrate nonahydrate, cobalt nitrate hexahydrate, oxalic acid dihydrate and ethylene glycol are mixed and then ground, dried and baked. The method is simple and easy to implement. The catalyst is used in the preparation of the glyoxylic acid from the methyl glycolate, a fixed bed reactor is used, the reaction is performed under the conditions of the reaction temperature of 200 to 260 DEG C and the space velocity of gaseous methyl glycolate of 1740 ml/(h.g), the conversion rate of the methyl glycolate is 67% to 99%, and the selectivity of the glyoxylic acid is 55% to 100%.

The invention relates to a preparation method and application of a multifunctional super-sensitive Zn<2+> two-photon detection fluorescence molecular probe. Firstly, 2,4-dihydroxy benzaldehyde, diethyl glutaconate and anhydrous piperidine react in ethanol to obtain a product 1; the product 1 and acetic anhydride react in anhydrous pyridine to obtain a product 2; the product 2, osmium tetroxide andsodium periodate react in tetrahydrofuran to obtain a product 3; the product 3 and anhydrous potassium carbonate react in methyl alcohol to obtain a product 4; finally, the product 4 id dissolved into the ethanol; 2-hydrazinopyridine and glacial acetic acid are added; the steps of backflow, recrystallization and the like are performed; the multifunctional super-sensitive Zn<2+> two-photon detection fluorescence molecular probe is obtained. The probe is applicable to the qualitative and quantitative analysis of Zn<2+> in a biological sample; the detection is sensitive, accurate and fast; the probe can be applied to the relevant fields of analytical chemistry, life organic analytical chemistry, disease advanced diagnosis, medical clinic detection and the like.

The invention belongs to the field of biological sample preparation, and particularly relates to a biological electron microscope sample carbonization method. Volatile gas of 0.1 M osmium tetroxide liquid is adopted for conducting fumigation and burning on organic biological samples, so that the organic biological samples are completely carbonized to meet the requirement for scanning electron microscope observation. Biological electron microscope samples manufactured through the method have a better expression result and are environmentally friendly and low in carbon, operation is easy and convenient, the chemical and physical contraction rate of all the samples is small, the appearance structure is almost unchanged, and the fine structure is clear. The method breaks through the bottleneck of manufacturing of some electron microscope samples so that some transmission electron microscope samples and scanning electron microscope samples which can not be manufactured in the prior art can be smoothly manufactured and meet the requirement for electron microscope observation. The method can be used for biological electron microscope sample manufacturing of biological sample tissue, bacteria, organic macromolecule protein bodies or organic macromolecule substances.

The invention discloses a synthesis process of a ticagrelor intermediate. The synthesis process of the ticagrelor intermediate is characterized by including the steps: 1) under acidic condition, contacting benzaldoxime with cyclopentadiene for reaction so as to obtain a compound shown in formula I; 2) under the catalysis of osmium tetroxide, using hydrogen peroxide to oxidize the compound shown in the formula I so as to obtain a compound shown in formula II; 3) under the catalysis of p-toluenesulfonic acid, reacting the compound shown in the formula II and acetone to obtain a compound shown in formula III; 4) in the presence of an alkali, reacting the compound shown in the formula III with 2-bromoethyl alcohol so as to obtain a compound shown in formula IV; 5) reducing the compound shown in the formula IV so as to obtain the ticagrelor intermediate. The raw materials used here in the method provided herein are low in cost and easy to obtain, so that production cost; the use of chiral materials is not required, a high stereoselectivity product can be acquired through cycloaddition reaction, the steps are short, the reaction yield is very high, and a new approach for the synthesis of ticagrelor is provided.

The invention discloses a method for preparing a scanning electron microscope sample of carp muscle extracellular connective tissue. The method comprises fixing muscle in a pre-fixation solution, sucking out the pre-fixation solution, adding a NaOH solution to the muscle, carrying out oscillation and cleaning, fixing a sample in a tannic acid solution, carrying out cleaning, fixing the sample through osmium tetroxide, carrying out cleaning, washing the sample through a cryoprotectant solution, orderly carrying out dehydration through methanol according to concentration gradient from low to high, putting the dehydrated sample into a methanol solution, carrying out quick-freezing through liquid nitrogen, slicing the sample, carrying out replacement through tertiary butanol, carrying out freeze drying on the sample, and recording the dried sample through photograph. The method can guarantee the complete structure of the sample subjected to cytoplasm removal, does not dissolve or partiallydissolve the connective tissue under action of cytoplasm and keeps the integrity of the connective tissue. Through the method, clear and strong three-dimensional effect images of the connective tissue under scanning electron microscope observation are obtained and the micro-structure characteristics can be well observed.

The invention discloses a method for chemically inducing osmium to be oxidized through static type ultraviolet light and a reaction device. The method comprises the following steps of: introducing a to-be-detected solution sample containing osmium into a sample reaction quartz tube, irradiating the sample through ultraviolet light, and inducing osmium in the sample to be oxidized to generate osmium tetroxide, so as to form an osmium tetroxide solution. The osmium tetroxide solution obtained by using the method is measured by directly using ICP-OES (Inductively Coupled Plasma-Optical Emission Spectroscopy) or ICP-MS (Inductively Coupled Plasma-Mass Spectrometry), so that an osmium signal can be obtained; or osmium tetroxide is measured by using the ICP-MS or N-TIMS (Thermal Ionization Mass Spectrometry) after purifying osmium tetroxide in the solution by using an extraction or distillation method, so that the osmium signal can be obtained. The reaction device provided by the invention at least comprises a cylindrical reaction cavity body and the reaction quartz tube positioned in the middle part of the reaction cavity body. 2-8 ultraviolet lamps are arranged on the periphery of the reaction quartz tube in an encircling manner. The method and the reaction device disclosed by the invention have the advantages that: the method is simpler; any oxidization and reduction reagent is not required; loss of osmium in the sample and pollution caused by osmium in a pre-treatment process are reduced; the sensitivity is relatively higher; compared with the traditional atomization sample introduction, the sample can be introduced more effectively; and the detection limit is lower.

The invention discloses a method for extracting molybdenum, rhenium and a radioactive cause 187Os, belongs to the technical field of mineral extraction, and solves the problems that the molybdenum, the rhenium and the radioactive cause 187Os cannot be recovered at the same time and the recovery process seriously pollutes the environment in the prior art. The method for extracting comprises the following steps that burdening, roasting, water leaching and filtering are performed to obtain a first liquid phase and a first solid phase, the first solid phase enters a molybdenum acid boiling and osmium distillation process to obtain volatile osmium tetroxide and slurry, the volatile osmium tetroxide enters a subsequent 187Os extraction process, and the slurry enters a subsequent molybdenum extraction process; and the first liquid phase contains rhenium, and the first liquid phase enters a subsequent rhenium extraction process. The molybdenum extraction process comprises the following steps of filtering, impurity precipitating, molybdenum extracting through ion exchange, eluting and crystallizing, and then ammonium molybdate is obtained. The method realizes simultaneous extraction of themolybdenum, the rhenium and the 187Os by one process.

The invention relates to a high fluorescence quantum yield two-photon Zn<2+> detection fluorescence molecular probe as well as a preparation method and application thereof. The molecular probe is specifically synthesized through the following steps: firstly, 2,4-dihydroxy benzaldehyde, amylene diacid diethyl ester and anhydrous piperidine react in ethyl alcohol to obtain a product 1, the product 1reacts with acetic anhydride in anhydrous piperidine to obtain a product 1, the product 2 reacts with osmium tetroxide and sodium periodate in tetrahydrofuran to obtain a product 3, and the product 3reacts with anhydrous potassium carbonate in methyl alcohol to obtain a product 4; and finally, the product 4 is dissolved in ethyl alcohol, 6-hydrazinonicotinic acid and glacial acetic acid are added to flow back, and recrystalization is conducted, so that the high fluorescence quantum yield two-photon Zn<2+> detection fluorescence molecular probe is obtained. The high fluorescence quantum yieldtwo-photon Zn<2+> detection fluorescence molecular probe is suitable for qualitative analysis of Zn<2+> in biological samples such as cells and zebrafish, has the advantages of being low in toxicityand large in penetrating depth, and can be applied to related fields such as analysis chemistry, life organic analysis chemistry, disease prediagnosis and medical clinical detection.

The invention discloses a 1% osmium tetroxide fixative and a preparation method thereof. The following materials are adopted in the method which comprises the following steps of: (1) preparing a phosphate buffer solution from a disodium hydrogen phosphate solution and a sodium dihydrogen phosphate solution, and carrying out intermediate product inspection after the preparation, wherein the preparation process can be checked by two persons; (2) adding the phosphate buffer solution prepared in the step (1) to osmium tetroxide and distilled water, then purifying and carrying out pH value inspection; and (3) carrying out fused subpackaging on the solution prepared in the step (2) with brown ampoules, carrying out final examination after packaging, and then delivering out of warehouse. The invention has the advantages of high quality, experiment time saving, experiment cost saving, long quality guarantee period and the like, reduces the pollution of outdated reagent to the environment and prevents reagent preparation from doing harm to the health of experimenters.

The invention discloses a preparation method of 3-oxocyclobutanecarboxylic acid. The preparation method comprises the following steps: (1) preparing methyl triphenylphosphine iodide (II); (2) preparing 3-benzal cyclobutanol (III); (3) preparing methyl-benzenesulfonic acid-3-benzal cyclobutanol ester (IV); (4) preparing 3-benzal cyclobutanecarbonitrile (V); (5) preparing 3-benzal cyclobutylcarboxylic acid (VI); (6) preparing 3-oxocyclobutanecarboxylic acid (VIII). The reaction formula is shown in the description. The preparation method has the advantages that the starting raw materials are low in price; the operation can be done with conventional equipment; ozonation is performed instead of hypertoxic osmium tetroxide oxidation, so that the cost is low, and the technical operation is simple and easy to carry out.

The invention provides a tasimelteon intermediate and a preparation method thereof. The preparation method comprises the following steps: with a compound a as a raw material, reacting the compound a with benzyl bromide so as to obtain a compound I; then subjecting the compound I to a reaction under the action of a combined catalyst consisting of potassium osmate dihydrate, potassium carbonate, potassium ferricyanide, benzyltriethylammonium chloride and methane sulfonamide or a combined catalyst consisting of osmium tetroxide, potassium carbonate, potassium ferricyanide, benzyltriethylammonium chloride and methane sulfonamide so as to obtain a compound II; subjecting the compound II to an oxidation reaction under the action of sodium periodate or lead tetraacetate so as to obtain an intermediate compound III and carrying out a reduction reaction so as to obtain a compound IV; and subjecting the compound IV to a reduction reaction to remove a benzyl protective group so as to obtain a compound V, then reacting the compound V with p-toluene sulfonyl chloride, carrying out hydroxyl protection and then carrying out cyclization under the action of potassium carbonate so as to obtain the tasimelteon intermediate compound VI. The invention provides a novel process for preparation of the tasimelteon intermediate; and the prepared tasimelteon intermediate has good purity and high quality and is applicable to industrial production.