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400results about How to "Single structure" patented technology

Spiro-di-thioxanthene-based small-molecule luminescent material and preparation and application thereof

The invention belongs to the technical field of organic photoelectric materials, and discloses a spiro-di-thioxanthene-based small-molecule luminescent material and preparation and application thereof. With spiro-di-thioxanthene nucleuses as framework units, and by changing connecting units at both sides of each spiro-di-thioxanthene nucleus and the number of the spiro-di-thioxanthene nucleuses, the molecular weight, Pi conjugacy and intramolecular charge transfer properties of the small-molecule luminescent material disclosed by the invention can be regulated. A spiro-structure therein can adjust the packing method among molecules. The preparation method of the material disclosed by the invention obtains a target compound with diphenyl sulfide and thioxanthone as original reaction materials by a series of simple reactions. The material structure is uniform, and the molecular weight is determined, and the spiro-di-thioxanthene-based small-molecule luminescent material has good solubility and film-forming property in common solvents. The spiro-di-thioxanthene-based small-molecule luminescent material can be applied as a hole transport material, an electron transport material and a luminescent material in OLED (Organic Light Emitting Diode) devices to improve the performance of the devices, and has profound significance for the development of high-performance devices.
Owner:SOUTH CHINA UNIV OF TECH

Eight-arm polyethylene glycol, preparation method and functionalized derivative thereof, and biologically relevant substance modified with functionalized derivative

The present invention discloses an eight-arm polyethylene glycol (formula 1), a preparation method and a functionalized derivative thereof, and a biologically relevant substance modified with the functionalized derivative, wherein the octavalent center structure CORE contains the residue obtained after the dehydroxylation of an octahydroxy disaccharide molecule, and n is the polymerization degree of a polyethylene glycol chain, and is selected from 1-2000. According to the present invention, the eight-arm polyethylene glycol has monodispersity or polydispersity; the molecular cost of the initiator is low and the purity of the initiator is low, such that the production cost is substantially reduced, the molecular weight and the distribution control of the polymerization product and the functionalized derivative are precise, and the purity and the performance of the product can be easily improved in the biologically relevant substance modified with the functionalized derivative; and the eight-arm polyethylene glycol and the derivative thereof can further have natural chiral centers. The formula 1 is defined in the specification.
Owner:XIAMEN SINOPEG BIOTECH

Method for preparing special aromatic polyoxadiazole and flame-retardant high-temperature resistant polyoxadiazole fiber thereof

The invention discloses a method for preparing special aromatic polyoxadiazole and flame-retardant high-temperature resistant polyoxadiazole fiber thereof. The special aromatic polyoxadiazole is prepared by the following method that the special aromatic polyoxadiazole is prepared from terephthalic acid, compound of which the structural general formula is expressed as formula I and hydrazine salt serving as monomers through condensation polymerization reaction. The polyoxadiazole fiber with high flame retardancy and high temperature resistance is prepared by using the special aromatic polyoxadiazole as a raw material. The fiber number of the prepared polyoxadiazole fiber is 1 to 20 dtex, the breaking strength is 2.5 to 5 cN.dtex-1, the elongation at break is 10 to 40 percent, the initial modulus is 50 to 250 cN.dtex-1, the moisture regain is 5.0 to 12.0 percent, the limited oxygen index is 30 to 38 percent, and the initial decomposition temperature is above 480 DEG C. The fiber can be widely used in the fields of protective products, filter materials, electric insulating materials, frictional sealed materials, various industrial textiles, high-temperature resistant paper, aviation and aerospace materials and the like.
Owner:JIANGSU BAODE NEW MATERIAL

Method for preparing high-density spherical lithium iron phosphate for lithium ion power battery

The invention relates to a method for preparing high-density spherical lithium iron phosphate for lithium ion power batteries, which is characterized by comprising the preparing processes: acid, a ferric iron resource and phosphor resource are mixed into mixed water solution; alkali is prepared into water solution; the mixed water solution and the alkali water solution are respectively and continuously introduced into a reaction kettle to carry out coprecipitation reaction, and a spherical iron phosphate precursor is synthesized; the precursor is used as a raw material and is evenly mixed with a lithium resource, a carbon resource and a doping metal compound, and then, the mixture is heated in a stove to obtain a spherical lithium iron phosphate powder material under a protective atmosphere. The spherical lithium iron phosphate powder material prepared by the method has freely controllable average grain diameter being from 4 microns to 15 microns, narrow distribution of the grain diameter tap density as higher as 1.4 g / cm<3> to 2.2 g / cm<3>, and has the characteristics of high specific capacity, rate discharge and good safety performance. The method has simple technical processes and is suitable for industrial mass production.
Owner:LANZHOU JINCHUAN NEW MATERIAL SCI & TECH

Method for preparing high-density lithium ferric phosphate

The invention relates to a method for preparing high-density lithium ferric phosphate, which comprises the following steps of: adding a lithium salt, a ferric salt, a phosphorus-containing compound and doping metal-containing elements into a dispersing agent by the conventional method, and performing ball mill twice; performing drying and predecomposition for 3 to 10 hours; crushing, adding at least one of lithium dihydrogen phosphate or potassium dihydrogen phosphate as a bonding agent in an amount which is 1 to 5 percent based on the weight of a predecomposition product, performing ball mill for 1 to 5 hours, and processing according to the prior art to obtain the high-density lithium ferric phosphate. In the method, the ball mill is performed twice in the first step, so that granules are fine; the grain size can be controlled within the range of between 300 and 2,000 nanometers, so that raw materials are mixed uniformly; more importantly, due to the addition of the bonding agent, the bonding among the granules is enhanced, the stacking density of products is improved, and contact conductivity among the granules is reduced; and the prepared products have good crystallization, simple structure and uniform grain fineness distribution and do not contain impure phases, the tap density is between 1.4 and 1.8 g/cm<3>, the specific surface area is between 5 and 11m<2>/g, the compaction density of pole pieces is between 2.4 and 2.8 g/cm<3>, and the specific capacity of first discharging at the room temperature is between 140 and 160 mAh/g.
Owner:HUNAN SHANSHAN ENERGY TECH CO LTD

Method for preparing cathode material of lithium iron phosphate

The invention discloses a method for preparing a cathode material of lithium iron phosphate for a lithium ion battery. The method comprises the following steps: firstly, adding a certain amount of deionized water into a ball mill, and adding lithium dihydrogen phosphate and ionic compound with good conductivity into the ball mill for stirring and ball milling at a high speed; secondly, adding iron oxide for stirring and ball milling at a high speed, and adding a certain amount of anhydrous ethanol as a dispersing agent; and finally, adding superfine conductive carbon black for full mixing and stirring to obtain evenly mixed powder by spray drying at a high speed, adding the powder into a mixing roll for mixing and granule crushing, and pressing the mixed powder into a block to improve the density of materials once again. After being preserved and sintered for 2 to 6 hours at 600 to 800 DEG C in a non-oxidizing sintering furnace and cooled below 50 DEG C, the materials after tablet pressing and granulation are discharged, crushed, refined and sifted, and the powder is dried so as to obtain lithium iron phosphate powder with no impurities, single structure and small granule size distribution. In addition, the preparation process method through improvement significantly reduces the cost for preparing the lithium iron phosphate and has little pollution.
Owner:丁建民

Erlotinib modified 4-difluoro-4-borata-3a-azonia-4a-aza-s-indacene derivatives, and preparation method and application thereof

The invention discloses erlotinib modified 4-difluoro-4-borata-3a-azonia-4a-aza-s-indacene derivatives, and a preparation method and application thereof. According to the invention, erlotinib which is a listed small-molecule inhibitor is used as a tumor target and is covalently connected to a 4-difluoro-4-borata-3a-azonia-4a-aza-s-indacene photosensitizer capable of being used for photodynamic therapy by the click reaction so as to obtain third-generation anti-tumor photosensitizers capable of being used for targeted therapy, namely, a double-erlotinib modified 4-difluoro-4-borata-3a-azonia-4a-aza-s-indacene derivative and a single-erlotinib modified 4-difluoro-4-borata-3a-azonia-4a-aza-s-indacene derivative. Meanwhile, by using the erlotinib modified 4-difluoro-4-borata-3a-azonia-4a-aza-s-indacene derivatives as research objects and respectively using human body hepatoma carcinoma cells HepG2 and HELF (Human Embryonic Lung Fibroblast) as tested cell strains, research on in vitro anti-tumor activity of the erlotinib modified 4-difluoro-4-borata-3a-azonia-4a-aza-s-indacene derivatives is developed, a prodrug suitable for molecular targeted therapy is screened out and the foundation is laid for application of the erlotinib modified 4-difluoro-4-borata-3a-azonia-4a-aza-s-indacene derivatives to targeted therapy of cancers. A synthetic method of the derivatives is simple; raw materials of the derivatives are easy to obtain and low in cost, have few side effects and high yield, are easy to purify and are beneficial to industrial production.
Owner:FUZHOU UNIV

Method for preparing ferric phosphate lithium anode material combining solid and liquid

A method for preparing a lithium iron phosphate anode material through solid-liquid combination comprises the following steps that a lithium source compound, an iron source compound, a phosphoric acid and phosphorus source compound and a small amount of carbonic organic precursor are weighed in proportion and mixed evenly, and then dried at a temperature of between 80 and 120 DEG C; the dried mixture undergoes ball milling inside a star-type ball-milling tank for 10 to 60 minutes so as to obtain a precursor powder material; the precursor powder material undergoes sweeping in the inert atmosphere or the reducing atmosphere for 3 to 5 minutes and then is sealed; the precursor powder material is heated to 400 to 800 DEG C at a heating rate of between 1 and 30 DEG C / min, and the temperature is maintained for 3 to 8 hours; and finally, the material is cooled down to room temperature, and is crushed to prepare lithium iron phosphate powder. Due to adopting solid-liquid combined raw materials, the method not only ensures that the raw materials are mixed more evenly, but also provides effective reducing atmosphere to synthesize the anode material with excellent electrochemical property during later sintering; moreover, a high-temperature solid-liquid combination method is adopted to reduce reaction temperature, reaction time and production cost.
Owner:CHONGQING TERUI BATTERY MATERIAL

Structure of broadband wave absorber and preparation method

InactiveCN104779447AWide absorption anglePromote absorptionAntennasMiddle infraredBroadband
The invention provides a structure of a broadband wave absorber and a preparation method. The structure comprises a substrate layer and a half-pyramid structure arranged on the substrate layer, wherein the half-pyramid structure is formed by alternately stacking and combining multiple metal-medium layers, the size of the structure is decreased progressively from bottom to top in the Z direction, the structure is a symmetrical structure, and the axis of symmetrical is a connecting line of centers of the metal-medium layers. A substrate is coated with the metal-medium layers sequentially with a coating method, and then the half-pyramid structure is etched. The structure is simple: the structure of the wave absorber is single and convenient to prepare. The spectrum is easy to measure: at the measurement stage, the band ranging from 8 mu m to 14 mu m is a middle infrared band, and the transmission and reflection spectrum of the structure can be acquired easily by the aid of existing equipment, so that the absorption spectrum is acquired.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL

Passive distance measuring method based on target infrared radiation spectrum and band model

The invention discloses a passive distance measuring method based on a target infrared radiation spectrum and a band model. The method comprises the steps of (a) acquiring measurement data necessary for distance inversion through a corresponding sensing device, (b) establishing a distance measuring model based on the band model, and (c) establishing a passive distance measuring database and conducting object distance inversion. According to the method, the fact that the oxygen is evenly distributed in the atmosphere is utilized, a selected oxygen A absorption band is unitary in spectral line structure and has obvious features, an absorption cross section can be easily and accurately solved, interference of other gases in the atmosphere on measurement is avoided, oxygen concentration is stable, the influence of weather and districts is well avoided, and the established distance measuring model based on the band model solves the real-time problem during distance inversion. The technology not only can be used for fixing roadbed stations, but also can be applied to vehicle-mounted or airborne motion platforms, and has important application prospect in respect of infrared search and track systems and optoelectronic countermeasure.
Owner:ZHONGBEI UNIV

Catalyst for ethylene oligomerization and preparation method thereof

The invention relates to a catalyst for ethylene oligomerization and a preparation method thereof. The catalyst comprises a main catalyst which is a catalyst obtained by the steps of taking molecular sieve as a carrier, carrying out chemical bond grafting of silicon hydroxyl on the molecular sieve surface and a bis(diphenylphosphino)ammonia ligand containing silicon ethoxy, and then complexing with a chromium active component. The invention also provides the preparation method of the catalyst. The catalyst has the advantages of high catalytic activity, easy separation from a product and high content of alpha-olefins in the oligomerization product when used for catalyzing ethylene oligomerization.
Owner:TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Method for preparing g-C3N4 hollow fiber film on large scale

The invention discloses a method for preparing a g-C3N4 hollow fiber film on a large scale. The method includes the following steps of putting melamine or urea or a mixture of melamine and urea in a muffle furnace, firing the material at a temperature of 450-600 DEG C for 1-4 hours to obtain yellow g-C3N4 blocks, evenly grinding the yellow g-C3N4 blocks to form g-C3N4 powder, putting the g-C3N4 powder in the muffle furnace, firing the g-C3N4 powder at a temperature of 400-700 DEG C for 1-4 hours to obtain g-C3N4 nanometer sheets, dispersing the g-C3N4 nanometer sheets and polymers in organic solvent to prepare a casting membrane solution, and spinning the casting membrane solution (as a shell solution) and water (as a core solution) in a coagulating bath at the same time through a spinning head of a spinning machine to obtain the g-C3N4 hollow fiber film, wherein the mass ratio of g-C3N4 nanometer sheets to polymer to organic solvent is 1:(0.2-1):(4-10) and the ratio of shell solution flow speed to core solution flow speed is (0.5-5):1.
Owner:DALIAN OCEAN UNIV

Covalent polycompound of water-soluble polysaccharide and taxane compound, and preparation method and medical application of covalent polycompound

The invention relates to a covalent polycompound of water-soluble polysaccharide and taxane, and a preparation method and medical application of the covalent polycompound. The method disclosed by the invention comprises the following step: connecting the taxane compound to the water-soluble polysaccharide through a covalent bond by adopting selective protection and selective deprotection methods and a plurality of degradable structure units, so as to obtain the covalent polycompound which can retain the biological activity of the taxane compound and is relatively simplex in structure. The novel covalent polycompound is good in water solubility, and can replace an existing clinical taxane preparation free of a cosolvent with toxic and side effects.
Owner:王晖

Supported uniform nickel-cobalt (Ni-Co) alloy catalyst and preparation method thereof

The invention belongs to the field of catalysts for the preparation of synthesis gas by reforming hydrocarbons, and particularly relates to a supported uniform nickel-cobalt (Ni-Co) alloy catalyst anda preparation method thereof. The catalyst provided by the invention is prepared from the active phase of a Ni-Co alloy nano particle and a high-specific-surface-area Mg(Al)O composite oxide support.The preparation method comprises the following steps of firstly, synthesizing a Ni-Co-Mg-Al LDHs (Layered Double Hydroxides) lamellar composite hydroxide as a precursor by adopting a coprecipitationmethod, afterwards, obtaining a Mg(Ni,Co,Al)O oxide solid solution through roasting treatment, next, reducing through high-temperature hydrogen to in situ generate the Ni-Co alloy nano particle. The Ni-Co alloy nano particle of the supported uniform Ni-Co alloy catalyst is highly dispersed on the surface of the support, and the supported uniform Ni-Co alloy catalyst has the characteristics of being single in structure, uniform in composition, small in particle size which is approximately 8nm and high in metal-support interaction, and the like, and shows favorable catalytic activity, stabilityand anti-carbon performance to the reforming reaction of methane and carbon dioxide.
Owner:FUZHOU UNIV
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