37 results about "Air sensitivity" patented technology

The invention discloses a method for preparing a composite air-sensitive membrane of a carbon nano tube embedded with oxide quantum dots. The composite air-sensitive membrane is prepared by preparing a layer of an oxide nano particle membrane layer on a silicon substrate, sintering the silicon substrate in a sintering furnace at a high temperature and then growing a carbon nano tube on the oxide nano particle membrane through high-temperature pyrolysis. The composite air-sensitive membrane is the dendritic carbon nano tube embedded with the oxide quantum dots. The air-sensitive membrane with a composite structure increases passages for electron transportation and absorption, increases surface area and contributes to improvement on air sensitivity and selectivity. The preparation process of the composite air-sensitive membrane has the advantages of simple operation and low cost.

The invention belongs to the technical field of preparation of functional nano-materials, relates to a preparation method of nano-hierarchical structure nickel hydroxide and particularly relates to a method for hydrothermal synthesis of nickel hydroxide hierarchical structure microspheres assembled by nano-sheets. The method disclosed by the invention comprises the following steps of: mixing a nickel acetate (Ni(CH3COO)2) water solution with a polyethylene sodium benzenesulfonate water solution, placing in a high-pressure reaction kettle lined with polytetrafluoroethylene to perform hydrothermal reaction, cooling, then performing centrifugal separation, washing with water, washing with ethanol, and then drying. The nickel hydroxide hierarchical structure prepared by the method disclosed by the invention is good in monodispersity and uniform in appearance, the diameter is 1.5-3mu m, and the hierarchical structure is assembled by flaky nano-units in a spiral layer-by-layer superimposition way and belongs to a multi-stage mesoscopic structure. The structure material combines larger surface area and excellent anti-agglomeration stability, and has great application prospects in the fields of battery electrode materials, catalysis, air sensitivity and the like. The method disclosed by the invention has the advantages of simple process, no need of adding a precipitating agent, convenience in operation and good repeatability, and is expected to realize industrial production.

The invention provides a preparation method of a CuO/CoTiO3 composite air-sensitive film. The method comprises the following steps: respectively putting a TiO2 target and a Co3O4 target into two radio-frequency target positions of a magnetron sputtering instrument, and putting a Cu target into a direct current sputtering target; putting a Si substrate into a coating sample stage of the magnetron sputtering instrument, vacuumizing a coating chamber and a sample chamber by virtue of a vacuum system, and introducing Ar gas into the coating chamber so as to enable the pressure intensity in the coating chamber and the sample to be 0.2-2Pa; setting the power source power of the two radio-frequency targets as 100-400W, enabling the mol ratio of sputtered Ti and Co atoms to 1:(0.5-2) and meanwhile regulating the power of a direct current target to be 20-200W; sputtering for 10-90 minutes; then putting a precursor film obtained by sputtering into a muffle furnace, controlling the calcination temperature at 400-700 DEG C, calcinating for 0.5-3 hours and performing furnace cooling so as to obtain a final product. According to the preparation method, activation energy of an adsorption link and an oxidation-reduction reaction link are used for realizing room-temperature air sensitivity of a semiconductor. The preparation method is high in reaction efficiency and good in film-forming property.

The invention relates to a composite catalyst of silica-coated multi-metal nanoparticles and activated carbon powder. The catalyst comprises a multi-metal nanoparticle component, the activated carbon powder and a carrier, wherein the metal nanoparticles comprise palladium, copper and potassium, and the molar ratio of Pd: Cu: K is equal to 1: 18.6: 14.7; and the carrier is silica. The weight percents of the components are as follows: 10%-20% of multi-metal nanoparticles, 10%-50% of activated carbon powder and 40%-85% of carrier. The catalyst can effectively prolong the storage time of an original Wacker type catalyst in the air and reduce the air sensitivity. Furthermore, as the carrier becomes activated carbon and the silica, the hardness is higher than that of the pure activated carbon, and the hardness of the catalyst is 2-20 times of that of the catalyst which takes the pure activated carbon as the carrier, thereby leading the mechanical strength of the carrier to be higher than that of the pure activated carbon carrier and expanding the selection range of the types of catalyst reactors.

The invention discloses a method for synthesizing an alpha-benzyl benzofuran compound, which comprises the following step of: reacting a benzofuran compound and an aryl ethylene compound serving as raw materials in a solvent in the presence of a catalyst and organic alkali in an inert gas atmosphere to obtain the alpha-benzyl benzofuran compound. Compared with the existing method, the method disclosed by the invention has the advantages that the direct use of an air-sensitive zero-valent nickel complex as a catalyst is avoided, and the applicability of the substrate is obviously expanded; provided is a novel method for producing the alpha-benzyl benzofuran compound by a hydroheteroarylation reaction of an arylethene compound and a benzofuran compound, said method being achieved by an air-stable divalent nickel-based catalyst.

The invention discloses a transfer method of an air sensitive sample applied to an X-ray photoelectron spectrometer, the method comprises the following steps of: directly placing a pre-reduced air-sensitive sample in a low-boiling-point hydrocarbon solvent, immobilizing a mixed system of the low-boiling-point hydrocarbon solvent and the sample on an XPS special sample table, transferring the mixed system to an XPS pre-vacuumizing chamber, and after pre-vacuumizing until the vacuum degree is at least 5 * 10 <-8 > Torr, transferring to an XPS analysis chamber for XPS analysis. According to the method, the inert and volatile hydrocarbon substances are utilized, the solvent is completely pumped away through XPS pre-vacuumizing, it is guaranteed that the sample is not directly exposed in the air, the problem of transferring of the XPS sample sensitive to the air under the air isolation condition is simply and ingeniously solved, and the in-situ online treatment process of the air-sensitive sample which is tedious in operation and high in cost can be replaced.

The invention belongs to the technical field of the chemical detection equipment, and specifically relates to a freezing conveying sample-injection device and method for element analyzer special sample detection. The freezing conveying sample-injection device for element analyzer special sample detection comprises a glove box, an electronic scale, an element analyzer, a freezing device and a precise sample injection device; the electronic scale and the freezing device are arranged in the glove box, a sample outlet of the glove box is connected with a sample inlet of the precise sample-injection device, the sample outlet of the precise sample-injection device is connected with the sample inlet of an element analyzer. By adopting an innovative idea for directly converting the liquid sample into a solid sample to detect, the problems that the existing detection equipment cannot accurately detect carbon, hydrogen, nitrogen, sulfur and oxygen elements in the liquid sample and an air sensitive sample and the organic elements in the liquid sample with strong volatility cannot be detected are solved.

The invention relates to the technical field of fine chemical engineering, and provides a synthetic method of adapalene. The synthetic method comprises: performing a coupling reaction of 2-methoxycarbonyl-6-naphthyl p-toluenesulfonate or 2-methoxycarbonyl-6-naphthyl dimethylamino sulfamide with bis(4-methoxyl-3-adamantyl phenyl)boric acid under the catalysis of nickel to obtain 6-[3-(1-adamantyl)-4-methoxyl phenyl]-2-methyl naphthoate, and then performing hydrolysis to obtain the adapalene product. The method of the invention substitutes bis(4-methoxyl-3-adamantyl phenyl)boric acid with a mild preparation condition and low price for 4-methoxyl-3-adamantyl phenylboronic acid with high price, and reaches the purpose of reducing raw material cost without using air-sensitive metal organic reagents; the method also partially substitutes cheap N,N'-bisalkyl N-heterocyclic carbene precursor quaternary ammonium halogen salt for organic phosphine ligands, is simple in preparation operation, and has a significantly increased product yield of 58-90%; the production cost is decreased obviously; the generation of 'three wastes' is less; and the method is suitable for industrial scale production.

Ionizers having carbon nanotube (CNT) ion emitting heads of the present invention include ionization circuitry supplying voltage at ionization potential and carbon nanotube (CNT) ion emitters operatively connected thereto. The carbon nanotube (CNT) ion emitters are mechanically and electrically stable, provide good ion flows for air purification and/or air invigoration when actuated at ionization potential and are capable of prolonged use in highly polluted environments.

The invention relates to the technical field of auxiliary treatment of air-sensitive materials, in particular to an air-sensitive material treatment device which is characterized in that a first connecting hole is formed in a sealed box body, a collecting pipe composed of a connecting section, a collecting section and a filtering section which are communicated in sequence is arranged on the first connecting hole, and a connecting part is communicated with the first connecting hole; the inner diameter of the collecting section is larger than the inner diameters of the filtering section and the connecting section, during use, gas carrying the air sensitive material in the sealed box body passes through the collecting pipe and is intercepted by the filter element and the filter screen arranged in the collecting pipe, and finally the air sensitive material is deposited in the collecting section; therefore, the gas discharged from the sealed box body to the external environment is pure gas, and the defect of pollution to the environment is avoided.

The invention discloses a preparation method of an alcohol compound containing fluorine atoms, which comprises the following steps: taking halogenated alkane and trifluoro-alkene as raw materials, reacting in a solvent under the actions of a nickel catalyst, a ligand and zinc powder according to the following reaction formula to prepare the alcohol compound containing fluorine atoms. The fluorineatom-containing alcohol compound prepared by the method is high in yield and mild in reaction condition. According to the method disclosed by the invention, synthesis of the fluorine atom-containing alcohol compound is realized for the first time. Meanwhile, the reaction system is simple in feeding mode, and reagents sensitive to moisture and air do not need to be used. The halogenated alkane compound can be directly synthesized from an alcohol compound, and the reaction functional group is excellent in compatibility and high in reaction yield.