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54results about How to "Potential for mass production" patented technology

Efficient capturing, high-content imaging and whole transcriptome analyzing device and method for single cell

The invention belongs to the technical field of single-cell capturing and analysis and in particular relates to an efficient capturing, high-content imaging and whole transcriptome analyzing device and method for a single cell. The device is used for capturing the single cell; the device comprises a polydimethylsiloxane micro-well array chip and a cell culture plate substrate or a cell culture dish substrate; the micro-well array chip is fitted to the cell culture plate substrate or the cell culture dish substrate. The invention provides the device and method, which can be used for simultaneously carrying out single-cell high-throughput imaging analysis, whole transcriptome analysis of the target single cell and deep exploration of heterogeneity between the single cells from a whole transcriptome level of the single cells.
Owner:UNIV OF SCI & TECH BEIJING

Filter based on axial direction apodized grating

The present invention discloses a filter based on axial direction apodized grating. Input single mode waveguide is connected with the upper end port of the left end of an asymmetrical gradual changing directional coupler through input gradual changing waveguide, and the lower end port of the left end of the asymmetrical gradual changing directional coupler is connected with bending waveguide to realize reflection signal download; and the upper end port of the right end of the asymmetrical gradual changing directional coupler is connected with the left end of an antisymmetrical multimode waveguide grating, and the right end of the antisymmetrical multimode waveguide grating is connected with the output single mode waveguide through output gradual changing waveguide. The separation of grating reflection signals employs the asymmetrical gradual changing directional coupler with large tolerance and small insertion loss to realize download of the grating signals; based on a grating filter, the filter based on axial direction apodized grating is large in tolerance and wide in bandwidth regulation range and cannot be limited by the FSR so as to realize filters with various different bandwidth demands; and moreover, the axial direction position regulation of grating teeth realizes apodization so as to realize a grating filter with large sideband suppression ratio and greatly improve the performance of the grating filter.
Owner:ZHEJIANG UNIV

Manufacture method of optical printed wiring board

The invention provides a manufacture method of an optical printed wiring board. The manufacture method of the optical printed wiring board includes the following steps: a step of opening a groove, a step of pressing a plate, a step of cutting out an angle, a step of polishing a laser surface and a step of drilling a hole on the back. The manufacture method of the optical printed wiring board has the advantages that a bottleneck of electric mutual connection broadcasting brand width on a conventional printed wiring board is broken through and signal broadcasting brand width can be higher than 10 gigabytes / second. Besides, conventional optical components such as a vertical cavity face emitting laser device. An optical sensor and the like can be also inserted on a wiring board face. The wiring board face is compatible with an existing surface mount technology and the development potential for mass production.
Owner:ELEC & ELTEK GUANGZHOU ELECTRONICS +1

2*2 optical switch with low loss and low random phase error and N*N optical switch array

InactiveCN111897173AReduce random phase errorsReduce complexityNon-linear opticsUltra-widebandPhase shifted
The invention discloses a 2*2 optical switch with low loss and low random phase error and an N*N optical switch array. First and second input waveguides are connected with first and second front benttapered waveguides respectively after passing through a first power divider; the front bent tapered waveguides in the two groups of interference arms are sequentially connected with the rear bent tapered waveguides through the front end tapered waveguide, the phase shift waveguide and the rear end tapered waveguide; and the first rear bent tapered waveguide and the second rear bent tapered waveguide are connected with the first output waveguide and the second output waveguide through a second power divider. According to the invention, the low-loss ultra-wideband power divider is obtained in anadiabatic coupling or bending directional coupling mode; the random phase error of the interference arms is reduced by introducing the wide waveguides; and the bent tapered waveguides and the taperedwaveguides are added to further reduce the random phase error of the interference arm, so that the 2*2 optical switch with low loss and low random phase error and the N*N optical switch array are finally realized; and the optical switch has the advantages of simple structure, simple process, excellent performance and the like.
Owner:ZHEJIANG UNIV

Non-disruptive control method based on silicon-based waveguide grating adjustable harmonic division multiplexing system

The invention discloses a non-disruptive control method based on a silicon-based waveguide grating adjustable harmonic division multiplexing system. The system is implemented based on a silicon-basedwaveguide grating and comprises multiple tunable filter cascades, wherein each tunable filter consists of two identical Bragg grating cascades, and two adjacent tunable filters are connected through single-mode waveguide; the first-stage Bragg grating filter, the second-stage Bragg grating filter and the second curved waveguide in each tunable filter are covered with metal electrodes, respectively; and the on and off of the download channel of each tunable filter can be controlled by controlling the voltage of the metal electrodes. The control method provided by the invention does not affect other filters when adjusting the working wavelength of any filter, and can achieve non-disruptive regulation. In addition, the invention is manufactured by a planar integrated optical waveguide process, which is completed in one etching, easy to manufacture, low in cost, small in loss, and good in performance.
Owner:ZHEJIANG UNIV

Method for improving coercive force of sintered neodymium iron boron magnet

InactiveCN106601403AIncreased coercive force HcjHigh coercive force HcjInductances/transformers/magnets manufactureMagnetic materialsSurface layerMetallurgy
The invention discloses a method for improving the coercive force of a sintered neodymium iron boron magnet. The method comprises the following steps: using a magnetron sputtering technology, and sputtering a rare-earth metal thin film with the thickness of 1 to 8 microns on the surface of a sintered neodymium iron boron magnet blank. A Dy / Tb thin film is formed on the surface of the magnet by using the magnetron sputtering technology, the Dy / Tb enters into a surface layer of Nd2Fe14B crystal particles through grain boundary diffusion seepage, and the anisotropy is strengthened, so that the coercive force of the magnet is greatly improved under the condition of guaranteeing that residual magnetism of the magnet is almost unchanged.
Owner:JINGCI NEW MATERIAL CO LTD

Preparation method of porous calcium carbonate crystal particle having nanometer cone microstructure

The invention which belongs to the biomimetic synthesis inorganic material field concretely relates to a preparation method of a porous calcium carbonate crystal particle having a nanometer cone microstructure unit. The preparation method comprises the following steps: 1, preparing an organic additive solution with a certain concentration, and putting the organic additive solution into a cleaned container; 2, adjusting the pH value of organic additive solution to 5-13 by an acid solution or an alkali solution under stirring, adding an aqueous calcium salt or calcium hydroxide solution, uniformly stirring, and adding an aqueous carbonate solution to obtain a mixed solution, wherein the molar ratio of the calcium salt or calcium hydroxide to the carbonate is 1:1; 3, carrying out stationary ageing on the mixed solution under dustproof room temperature conditions; and 4, separating, and drying the obtained solid product to obtain the porous calcium carbonate crystal particle having the nanometer cone microstructure unit. The method of the invention has the advantages of simple operation and energy saving. The morphology, the particle size, the specific surface area and the cone microstructure unit dimension of the obtained porous calcium carbonate crystal particle can be regulated through regulating the concentration of the organic additive solution and the stationary ageing time in the invention.
Owner:INST OF CHEM CHINESE ACAD OF SCI

Preparation method of shape controllable monodisperse barium sulfate crystal particles

The invention belongs to the field of biomimetically synthesized inorganic material, specifically to a preparation method of shape controllable monodisperse barium sulfate crystal particles. The preparation method comprises the steps of: after cleaning a container, preparing a polymer solution which is 0.001g-2g / L in concentration; adjusting pH value of the polymer solution by acidic solution or alkali liquor under agitation to 1-13 and injecting barium salt aqueous solution and sulfate aqueous solution in same molarity with same flow to the polymer solution at the same time; after producing obvious turbid in the polymer aqueous solution, stopping injecting barium salt aqueous solution and sulfate aqueous solution; standing and aging for 5-120 hours in dustproof condition at room temperature; separating and drying to obtain the shape controllable monodisperse barium sulfate crystal particles. The method provided by the invention is simple to operate and can save energy resources. The barium sulfate crystal particles prepared are uniform in grain diameter, controllable in shape and the shape of the particles can be controlled from disc type to microballoon type continuously so that the invention has the potential for large scale production.
Owner:INST OF CHEM CHINESE ACAD OF SCI

Method for preparing apigenin

The invention provides a method for preparing apigenin, which comprises the following steps: performing the condensation reaction of the raw material of 2,4-dimethoxy-6-hydroxyacetophenone with p-methoxybenzaldehyde with the catalysis of an alkali to obtain a compound II; performing the cyclization reaction with the presence of a catalyst to obtain a compound III; heating to remove the methoxy group at an oxygen-isolated and acidic condition so as to obtain apigenin. The invention prepares apigenin by chemical synthesis, and has the advantages of simple process, easy processing for product separation and purification, high yield, mass production potential, abundant raw material sources, and low cost.
Owner:KUNMING UNIV OF SCI & TECH

Polypeptide specifically combined with beta-catenin protein with high affinity, and application and synthesis method of polypeptide

ActiveCN111909242AThe synthesis method is simple and easy to obtainInhibit onPeptide/protein ingredientsPeptidesDiseaseCancer cell
The invention discloses a polypeptide specifically combined with beta-catenin protein with high affinity, and application and a synthesis method of the polypeptide. The amino acid sequence of the polypeptide is LEHRERSLQT(X1)RDIQRML(X2)P, wherein X1 is leucine, norleucine or homoleucine, and X2 is phenylalanine, 1-naphthyl alanine, 2-naphthyl alanine, 2-anthryl alanine or 9-anthryl alanine. The polypeptide is used for inhibiting growth of cancer cells. By the polypeptide, various tumor treatment targets can be achieved. The polypeptide inhibits opening of a beta-catenin protein-mediated Wnt signal pathway by inhibiting mutual combination of the beta-catenin protein and BCL9 in the cancer cells, so that growth of tumors is inhibited, self-apoptosis of the cells is induced, and the tumor disease treatment targets are achieved. The synthesis method of the polypeptide is simple and easy to implement, and the final product has high yield efficiency, has mass production potential, and has great drug clinical transformation potential.
Owner:THE FIRST AFFILIATED HOSPITAL OF MEDICAL COLLEGE OF XIAN JIAOTONG UNIV

Method for manufacturing PDMS thin film integrated with sub-millimeter deep channel

The invention discloses a method for manufacturing a PDMS thin film integrated with a sub-millimeter deep channel. The method can be used for observing a micro living body under cultivation and growth states. A PMMA male mold is used as a PDMS channel duplication mold, flat PMMA adhered by transparent adhesive tapes is used as a thin film thickness control device, the obtained channel depth and the obtained thin film thickness are in a sub-millimeter scale, and the channel is embedded into the surface of the thin film. The PMMA male mold is manufactured by using an armok carving machine, and the bump height can reach the sub-millimeter scale, so that the PDMS channel with the sub-millimeter depth can be duplicated. PMMA of which two sides are adhered by a plurality of layers of transparent adhesive tapes is attached to a flat PMMA male mold, and the height of a cavity formed by the PMMA and the flat PMMA male mold is the height of cushion layers of the transparent adhesive tapes. When PDMS is poured into the cavity, the height is the thickness of the PDMS thin film. The height of the PMMA male mold can be controlled by finishing depth parameter setting in a tool path, and the thickness of the PDMS thin film can be controlled according to the layer number of the adhered transparent adhesive tapes.
Owner:ZHEJIANG UNIV

Synthesis method of stable isotope 18O labeled nipagin ester

The invention relates to a synthesis method of stable isotope 18O labeled nipagin ester. The synthesis method comprises the following steps: taking stable isotope 18O-water as a raw material to reactwith benzoic acid-4-diazosulfate by utilizing different feeding amounts of the 18O-water; carrying out column chromatography silica gel separation to obtain an intermediate product p-hydroxy benzoic acid-18O or p-hydroxy benzoic acid-18O2 respectively; then enabling the intermediate product to be subjected to condensation reaction with a hydroxyl compound under the condition of a catalyst and an organic solvent; finally, separating and purifying to obtain a target product nipagin ester-18O or nipagin ester-18O2. According to the synthesis method provided by the invention, the prepared 18O labeled nipagin ester series product has the advantages that the chemical purity is higher than 98 percent and the abundance of stable isotopes is higher than 95 percent atom 18O; the product can sufficiently meet a mass spectrum detection internal standard substance for detecting content of nipagin ester type preservatives in foods and cosmetics.
Owner:SHANGHAI RES INST OF CHEM IND

Method for preparing ink capable of being used for preparing Cu2ZnSnS4 solar cell absorption layer film

The invention discloses a method for preparing ink capable of being used for preparing a Cu2ZnSnS4 solar cell absorption layer film. The ink is prepared from dimethyl sulfoxide as a solvent, and contains four elements, namely copper, zinc, tin and sulphur. The preparation method of the ink comprises the following steps: firstly, respectively dissolving copper chloride, zinc chloride and stannic chloride with certain ratio into dimethyl sulfoxide; mixing the three solutions together and adding a certain amount of thioacetamide; finally dropwise adding ethanolamine to the solution; stopping dropwise adding when the solution becomes black to finally prepare stable ink. The prepared ink disclosed by the invention is stable, does not need expensive raw materials, and can be used for preparing the Cu2ZnSnS4 solar cell absorption layer film, a new idea is provided for development of the technology of a green and environment-friendly Cu2ZnSnS4 film solar cell with low cost and high conversion efficiency, and rapid development of the Cu2ZnSnS4 film solar cell industry can be promoted.
Owner:BEIJING UNIV OF TECH

Decoquinate liposome and preparation method and application thereof

The invention relates to a decoquinate liposome and a preparation method and application thereof. The preparation raw materials of the decoquinate liposome comprise the following components in parts by weight of 1 part of decoquinate and 2-20 parts of lecithin. The liposome is good in stability, shows favorable malaria resisting effects in and out of animal bodies, can be used for quickly relieving symptoms of malaria particularly subtertian malaria, and is high in safety. The preparation method is simple and feasible, and the decoquinate liposome has mass production potential.
Owner:BLUE ELEGANT BIOTECH CO LTD

Method for refining and purifying amorphous boron powder

The invention discloses a method for refining and purifying amorphous boron powder, the method comprises the following steps: carrying out acid medium ball milling, primary water washing, alkaline medium ball milling, secondary water washing and vacuum drying treatment on the amorphous boron powder to obtain the amorphous boron powder with the particle size of less than 1.2 mu m and the purity of more than 95%. According to the ball milling refining and acid / alkali washing purification method, the amorphous boron powder which is sold in the market and produced through a magnesiothermic reduction method can be synchronously refined and purified, the problems that the amorphous boron powder sold in the market is large in particle size and low in purity are solved, and the additional value of the amorphous boron powder is increased. The method provided by the invention has the advantages of short flow, low energy consumption, stable and reliable process and large-scale production potential.
Owner:江苏智仁景行新材料研究院有限公司

Method for preparing graphene under coupling effect of electric field and ultrasonic field

The invention discloses a method for preparing graphene under the coupling effect of an electric field and an ultrasonic field. According to the method, a cheap and easily-obtained high-purity graphite electrode is taken as a raw material, a quaternary ammonium salt is taken as an electrolyte, and the graphene is prepared under the coupling effect of the electric field and the ultrasonic field atroom temperature. Substances such as strong acid, strong alkali and strong oxidants are not used, the damage on the structure of the graphene is relatively little, and the method is simple and safe. According to the method, graphene quantum dots are prepared by using the graphite electrode in the electrode under the coupling effect of the electric field and the ultrasonic field, the electrolyte isa quaternary ammonium salt solution, and the method is green, environmentally-friendly, simple and safe, and has large-scale production potential.
Owner:SHANGHAI UNIV

A polarization-insensitive waveguide grating filter based on double-layer structure

The invention discloses a polarization-insensitive waveguide grating filter based on a double-layer structure; it includes a polarization-insensitive filter unit, and the polarization-insensitive filter unit includes a silicon waveguide apodized grating layer and a silicon nitride waveguide apodized A grating layer, where the TE signal is filtered by the silicon waveguide apodized grating and the TM signal is filtered by the silicon nitride apodized grating. The polarization-insensitive filter unit can be realized by using a multimode waveguide filter, or by a grating-assisted filter; the filter of the present invention can realize simultaneous filtering of TE mode and TM mode, and realize polarization-insensitive grating filter, and the device size can be effectively reduced by half compared to the traditional solution using a polarization rotator. In addition, the present invention is based on silicon-based and silicon nitride waveguide grating filters, with large tolerance and small insertion loss, and the central wavelength adjustment range is not limited by FSR, and filters with different bandwidths can be realized by setting different coupling coefficients.
Owner:ZHEJIANG UNIV

Polarization insensitive waveguide grating filter based on double-layer structure

The invention discloses a polarization insensitive waveguide grating filter based on a double-layer structure. The filter comprises a polarization insensitive filter unit, the polarization insensitive filter unit comprises a silicon waveguide apodized grating layer and a silicon nitride waveguide apodized grating layer, the silicon waveguide apodized grating filters TE signals, and the silicon nitride waveguide apodized grating filters TM signals. The polarization insensitive filter unit can be realized by adopting a multi-mode waveguide type filter and also can be realized by adopting a grating auxiliary type filter; according to the filter, simultaneous filtering in a TE mode and a TM mode can be achieved, a grating filter insensitive to polarization is achieved, and the device size can be effectively reduced by half compared with a traditional scheme adopting a polarization rotator. In addition, based on a silicon substrate and a silicon nitride waveguide grating filter, the filter is large in tolerance and small in insertion loss, the adjustment range of the central wavelength is not limited by FSR, and filters with different bandwidths can be achieved by setting different coupling coefficients.
Owner:ZHEJIANG UNIV

3D printing sea water desalination chip device based on ion concentration polarization principle

The invention relates to a 3D sea water desalination chip device based on an ion concentration polarization principle. The 3D sea water desalination chip device comprises a base adopting 3D printing and a shell adopting 3D printing, a convexly formed buffer solution channel is formed in the base, and a micro-nano membrane channel, a desalted water channel, a concentrated saline water channel and a water outlet are also formed in the base; after the shell and the base are combined, a saline water channel is formed. After a 3D printing material is adopted for combination, fit is tight, no seam is formed, and leakproofness is extremely good; the base and the shell are clamped, connected and fixed by virtue of a 3D printing surrounding edge, the fixed position is accurate, glue or a nail does not need to be used, the integrity can be guaranteed, and the device can not be destroyed by the glue or nail; the manufacturing cost is low, and the device has mass production potency and is recyclable; the device is supported by 3D printing, so that the precision of the dimensions and shape of the device is not limited by familiarity degree of skills of workers, and the obtained finished product has relatively good dimensions and precision; the ion concentration polarization principle is utilized for carrying out sea water desalination, the energy consumption is low, the desalination efficiency is high, and no harm is done to the environment.
Owner:THIRD INST OF OCEANOGRAPHY STATE OCEANIC ADMINISTATION

Preparation method for grating structure color functional surface based on injection shaping

The invention discloses a preparation method for a grating structure color functional surface based on injection shaping. A silicon mother mold with a grating structure is prepared by an ultra-violetlithography machine and an etching machine; electric conduction processing is conducted on the silicon mother mold, a gold film conductive layer is deposited on the surface of the silicon mother mold,the silicon mother mold is then placed in an electroforming liquid as a cathode and connected with a negative electrode of a pulse power source, a conductive nickel plate is taken as an anode and connected to a power source positive electrode, an electroforming technology is started, ultrasonic cleaning is conducted with absolute ethyl alcohol and distilled water, and a nickel mold core of whichthe surface has the grating structure is obtained after drying; and the nickel mold core is installed on an injection molding mold, and then the injection mold is installed to an injection molding machine for injection molding, so that the grating structure color functional surface is obtained. The method is short in forming cycle, and high in production efficiency and has potential in batched manufacture.
Owner:CENT SOUTH UNIV

Anti-dandruff composition, and preparation method and application thereof

The invention provides an anti-dandruff composition, and a preparation method and application thereof. The anti-dandruff composition is prepared from cajeput essential oil, juniperus formosana essential oil, caraway essential oil and a radix et rhizoma rhei palmatae extract. The invention also provides the preparation method of the anti-dandruff composition. The preparation method comprises the following steps: dispersing the rheum palmatum extract in a solvent to obtain a dispersion liquid; mixing the cajeput essential oil, the juniperus formosana essential oil and the caraway seed essential oil to obtain a mixed solution; and adding the mixed solution into the dispersion solution, and stirring to obtain the anti-dandruff composition. The anti-dandruff composition disclosed by the invention has excellent effects of inhibiting growth of pathogenic bacteria and maintaining balance of scalp flora, and can generate anti-inflammatory and itching-relieving effects in cooperation with the effect of inhibiting histamine secretion; all the functional components are natural plant extracts, so that the irritation to a human body is relatively small; and the preparation method is simple and efficient and has wide application value.
Owner:广州美物生物科技有限公司

Method for preparing graphene quantum dots under the coupling action of electric field and ultrasonic field

The invention discloses a method for preparing graphene quantum dots under the coupling action of an electric field and an ultrasonic field. The present invention selects cheap and easily available high-purity graphite electrodes as raw materials, uses disubstituted imidazole ionic liquids as electrolytes, and prepares water-soluble graphene quantum dots under the coupling action of electric field and ultrasonic field at room temperature. The graphite electrode of the present invention prepares graphene quantum dots under the coupling action of an electric field and an ultrasonic field in an electrolyte, and the electrolyte is a disubstituted imidazole ionic liquid. The method of the present invention is green, environmentally friendly, simple and safe, and has large-scale production potential.
Owner:SHANGHAI UNIV

Method for preparation of barium sulfate porous material with different microstructures by taking barium peroxide as barium source

Belonging to the field of inorganic material preparation, the invention particularly relates to a method for preparation of a barium sulfate porous material with different microstructures by taking barium peroxide as a barium source. The method includes: adding an organic additive and an inorganic alkali water solution into a hydrogen peroxide water solution, controlling the concentration of the organic additive in the hydrogen peroxide water solution at 0-20g / l, and keeping the pH value of the hydrogen peroxide water solution at 11-13.5; adding a sulfate under stirring; after the sulfate is completely dissolved, adding barium peroxide; carrying out static ageing at room temperature; and conducting separation and drying, thus obtaining the barium sulfate porous material with different microstructures. In the invention, by adjusting the added organic additive, the microstructure shape of the prepared barium sulfate porous material can be regulated. The method provided in the invention has the characteristics of wide material sources, energy saving, simple operation, no discharge of three wastes, and the prepared barium sulfate porous material has a controllable structure, so that the method has the potential of mass production.
Owner:INST OF CHEM CHINESE ACAD OF SCI

2D semiconductor heterojunction based AND/OR logic gate circuit and realization and preparation methods thereof

The invention discloses a 2D semiconductor heterojunction based AND / OR logic gate circuit and realization and preparation methods thereof. Two 2D semiconductor heterogeneous PN junctions with unidirectional conductivity are connected in parallel and cooperated with a fixed resistor to realize AND / OR logic functions. The grid voltage is changed to adjust the direction of the unidirectional conductivity of the 2D semiconductor heterogeneous PN junctions, so that the PN junction is changed into an NP junction. When the 2D semiconductor heterogeneous PN junctions are in different unidirectional conductivity directions, the AND and OR logic functions can be realized, namely, change between AND and OR logics can be changed by changing the grid voltage. Thus, a preparation technology of the device is simple, the circuit is easy to realize, the circuit area is reduced greatly and large-scale integration can be realized.
Owner:PEKING UNIV

Method for producing lithium battery silicon-carbon negative electrode active material by magnetic coating ball milling

The invention relates to the field of lithium battery negative electrodes, and discloses a method for producing a lithium battery silicon-carbon negative electrode active material by magnetic coatingball milling. The preparation method comprises the following steps of: (1) mixing and ball-milling silicon powder and iron powder, and carrying out vacuum annealing to obtain powder A; (2) modifying porous carbon powder by using an anionic surfactant, then mixing the modified porous carbon powder with a ferrite precursor, deionized water and anhydrous ethanol to prepare a turbid liquid, carrying out ultrasonic oscillation, performing filtering, collecting the filter residue, and carrying out vacuum sintering and magnetization to obtain powder B; and (3) adding the powder A, the powder B and aPTFE emulsion into deionized water to prepare turbid liquid, carrying out ultrasonic dispersion, then performing standing and settling, and granulating, annealing, grinding and screening settled substances to obtain the lithium battery silicon-carbon negative electrode active material. According to the preparation method, the uniformity and the compounding capacity of the silicon powder and the carbon powder are effectively improved through the metal adsorption capacity of the magnetic material, the obtained silicon-carbon negative electrode material has excellent cycle performance, meanwhile,the preparation process is simple, and the large-scale production potential is achieved.
Owner:CHENDU NEW KELI CHEM SCI CO LTD

Novel efficient chelate antioxidant as well as preparation method and application thereof

The invention discloses a novel efficient chelate antioxidant as well as a preparation method and application thereof, dopamine hydrochloride, sulfate hydrate and a buffer agent are taken as main raw materials, and the specific preparation method comprises the following steps: in a buffer solution, adding a catalyst, the polydopamine chelate antioxidant is prepared through oxidative auto-polymerization of dopamine and chelation reaction of polydopamine and sulfate hydrate. The polydopamine chelate antioxidant is of a macromolecular polymer structure, is not easy to migrate, is well dispersed in a non-polar polyolefin matrix, has an efficient thermal oxidation stabilization effect on a polyolefin material, is simple in synthesis method and has large-scale production potential.
Owner:NO 59 RES INST OF CHINA ORDNANCE IND +1

Method for preparing titanium niobium oxide

The invention relates to the technical field of new energy materials, in particular to a method for preparing titanium niobium oxide. The method comprises the following steps: S1, adding a niobium source and a titanium source into a solvent; the solvent is alcohol or a mixture of alcohol of which the boiling point is greater than 100 DEG C; the niobium source comprises one or two of niobium oxalate and niobium ammonium oxalate, and the titanium source comprises one or two of titanium isopropoxide and tetrabutyl titanate; s2, concentrating the solution obtained in the step S1 at 100-220 DEG C to form gel; and S3, calcining the gel obtained in the step S2 to obtain the titanium niobium oxide. By screening a titanium source, a niobium source and a solvent, when gel is formed, the temperature is controlled to be 100 DEG C or above, and esterification reaction is carried out in a solution, so that titanium and niobium are uniformly distributed in the gel, and uniform distribution and consistent performance of product particles are facilitated. And the preparation process is carried out under normal pressure, the reaction condition is mild, the repeatability is good, and the potential of large-scale production is achieved.
Owner:CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS

Intelligent contact lens containing flexible circuit and preparation method thereof

The invention discloses an intelligent contact lens containing a flexible circuit and a preparation method thereof.The intelligent contact lens comprises a first packaging layer, the flexible circuit, a second packaging layer and a contact lens layer which are sequentially arranged, and the second packaging layer is located on the side, opposite to the eyes, of the contact lens layer; the first packaging layer and the second packaging layer are made of the same material which is an elastomer material. According to the invention, no extra substrate material is introduced, the material adopted by the packaging layer has high stretchability and bendability, and the whole preparation process can be well integrated into the production process of the current contact lenses, and has the potential of large-scale production.
Owner:SOUTHEAST UNIV

A kind of synthetic method of stable isotope 18o labeled parabens

The invention relates to a synthesis method of stable isotope 18O labeled nipagin ester. The synthesis method comprises the following steps: taking stable isotope 18O-water as a raw material to reactwith benzoic acid-4-diazosulfate by utilizing different feeding amounts of the 18O-water; carrying out column chromatography silica gel separation to obtain an intermediate product p-hydroxy benzoic acid-18O or p-hydroxy benzoic acid-18O2 respectively; then enabling the intermediate product to be subjected to condensation reaction with a hydroxyl compound under the condition of a catalyst and an organic solvent; finally, separating and purifying to obtain a target product nipagin ester-18O or nipagin ester-18O2. According to the synthesis method provided by the invention, the prepared 18O labeled nipagin ester series product has the advantages that the chemical purity is higher than 98 percent and the abundance of stable isotopes is higher than 95 percent atom 18O; the product can sufficiently meet a mass spectrum detection internal standard substance for detecting content of nipagin ester type preservatives in foods and cosmetics.
Owner:SHANGHAI RES INST OF CHEM IND

Omni-directional dynamic heat source type uniaxial micro-mechanical accelerometer and processing method thereof

The invention discloses an omni-directional dynamic heat source type uniaxial micro-mechanical accelerometer and a processing method thereof. The accelerometer comprises a sensitive layer, a substrate layer and a cover plate, the sensitive layer comprises a middle heating cavity and a middle detection cavity, and the upper surface of the sensitive layer is provided with an omni-directional oscillator heater and a pair of thermistors; the omni-directional dynamic heat source pendulum heater is suspended at the central position of the sensitive layer through eight completely symmetrical semicircular supporting beams; the heater and the thermistor are electrified in a constant current mode; and a groove is etched on the cover plate and is hermetically connected with the upper surface of the sensitive layer. Measurement of uniaxial acceleration can be realized, the input acceleration on the X axis can be sensed, the measurement range is large, and the impact resistance is high. The accelerometer inherits the advantages of an MEMS sensor, has the advantages of being small in size, light in weight, low in cost and the like, and conforms to the development direction of the sensor towards microminiaturization, integration and intelligence. Meanwhile, the accelerometer has the advantages of simple structure and processing technology, large measuring range, high reliability and the like.
Owner:朴然
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