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176 results about "Electronic effect" patented technology
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An electronic effect influences the structure, reactivity, or properties of molecule but is neither a traditional bond nor a steric effect. In organic chemistry, the term stereoelectronic effect is also used to emphasize the relation between the electronic structure and the geometry (stereochemistry) of a molecule.
Recyclable ruthenium catalysts for metathesis reactions
ActiveUS20070043180A1Utility and advantageWide applicationRuthenium organic compoundsOrganic compound preparationAlkeneEfficient catalyst
The invention relates to novel carbene ligands and their incorporated monomeric and resin / polymer linked ruthenium catalysts, which are recyclable and highly active for olefin metathesis reactions. It is disclosed that significant electronic effect of different substituted 2-alkoxybenzylidene ligands on the catalytic activity and stability of corresponding carbene ruthenium complexes, some of novel ruthenium complexes in the invention can be broadly used as catalysts highly efficient for olefin metathesis reactions, particularly in ring-closing (RCM), ring-opening (ROM), ring-opening metathesis polymerization (ROMP) and cross metathesis (CM) in high yield. The invention also relates to preparation of new ruthenium complexes and the use in metathesis.
Owner:ZANNAN SCITECH
Method and apparatus for molecular analysis using nanoelectronic circuits
InactiveUS20060275778A1Bioreactor/fermenter combinationsBiological substance pretreatmentsSingle electronNanoelectronic circuits
Devices and methods for detecting the constituent parts of biological polymers are disclosed. A molecular analysis device comprises a molecule sensor and a molecule guide. The molecule sensor comprises a single electron transistor including a first terminal, a second terminal, and a nanogap or at least one quantum dot positioned between the first terminal and the second terminal. A nitrogenous material disposed on the at least one quantum dot is configured for an interaction with an identifiable configuration of a molecule. The molecule sensor develops an electronic effect responsive to the interaction. The molecule guide is configured for guiding at least a portion of the molecule substantially near the molecule sensor to enable the interaction.
Owner:HEWLETT-PACKARD ENTERPRISE DEV LP
Method and apparatus for detection of molecules using nanopores
InactiveUS20070178507A1Bioreactor/fermenter combinationsBiological substance pretreatmentsSingle electronMolecular analysis
A molecular analysis device comprises a molecule sensor and a nanopore that passes through, partially through, or substantially near the molecule sensor. The molecule sensor may comprise a single electron transistor including a first terminal, a second terminal, and a nanogap or at least one quantum dot positioned between the first terminal and the second terminal. The molecular sensor may also comprise a nanowire that operably couples a first and a second terminal. A nitrogenous material that may be disposed on at least part of the molecule sensor is configured for a chemical interaction with an identifiable configuration of a molecule. The molecule sensor develops an electronic effect responsive to a molecule or responsive to a chemical interaction.
Owner:HEWLETT PACKARD DEV CO LP
Fluorine-containing titanium-silicon molecular sieve with MWW (Manual Wire Wrap) structure and preparation method and application thereof
ActiveCN102627291AComplete crystalline structureImprove catalytic oxidation performanceMolecular sieve catalystsEther/acetal/ketal group formation/introductionX-rayCatalytic oxidation
The invention discloses a fluorine-containing titanium-silicon molecular sieve with a MWW (Manual Wire Wrap) structure and a preparation method and an application thereof. In the molecular sieve, a fluorine atom is connected with a framework silicon atom in the form of a chemical bond, an XRD (X-Ray Diffraction) spectrogram contains a characteristic spectral line of the molecular sieve with the MWW structure, and characteristic peaks of -150+ / -5ppm and -143+ / -5ppm appear in a 19FMAS-NMR (19 File Management Assistant For Server-Nuclear Magnetic Resonance) spectrogram; the preparation method comprises the following steps of: synthesizing a boron-containing parent body, post-treating, baking and the like; and the molecular sieve serving as a catalyst is applied to catalytic oxidation reactions of compounds containing carbon-carbon double bonds and at least one other functional group as well as reactions for catalytically synthesizing oxime. The molecular sieve has a complete crystalline state structure; according to the electronic effect of framework fluorine, the molecular sieve and higher catalytic oxidation capability; a preparation process is simple, and is easy for industrial production; synthesis of corresponding epoxides or catalytic synthesis of oxime from compounds containing carbon-carbon double bonds and at least one other functional group can be catalyzed at higher activity and high selectivity; and a reaction process is environmentally-friendly.
Owner:EAST CHINA NORMAL UNIV
Method and apparatus for molecular analysis using nanoelectronic circuits
InactiveUS7947485B2Bioreactor/fermenter combinationsBiological substance pretreatmentsSingle electronNanoelectronic circuits
Owner:HEWLETT-PACKARD ENTERPRISE DEV LP
Dark red/near-infrared multifunctional aggregation-induced light-emitting material, preparation method and application thereof
ActiveCN110790698AEfficient killingThe synthesis method is simpleAntibacterial agentsOrganic chemistryPyridineBiology
The invention relates to a dark red / near-infrared multifunctional aggregation-induced light-emitting material, a preparation method and application thereof. According to the dark red / near-infrared multifunctional aggregation-induced light-emitting material, a pyridine ring in the molecular structure endows the molecule with electropositivity, and meanwhile, the molecule has appropriate lipo-hydropartition coefficient (with ClogP being greater than 3 and less than 5) and space structure, and is beneficial to combination with gram-positive bacteria. During co-culture of the molecule with bacteria, specific "lightening" imaging of gram-positive bacteria can be realized; the strong electron donating (D)-electron withdrawing (A) effect of the molecule itself causes absorption and emission wavelength red shift of the molecule, thus having dark red / near-infrared fluorescence emission and strong ROS generation capacity. Meanwhile, the aggregation-induced light-emitting material provided by the invention can efficiently kill gram-positive bacteria.
Owner:SHENZHEN UNIV
Recyclable ruthenium catalysts for metathesis reactions
ActiveUS7632772B2Utility and advantageLittle or no traceRuthenium organic compoundsOrganic compound preparationCarbeneAlkene
The invention relates to novel carbene ligands and their incorporated monomeric and resin / polymer linked ruthenium catalysts, which are recyclable and highly active for olefin metathesis reactions. It is disclosed that significant electronic effect of different substituted 2-alkoxybenzylidene ligands on the catalytic activity and stability of corresponding carbene ruthenium complexes, some of novel ruthenium complexes in the invention can be broadly used as catalysts highly efficient for olefin metathesis reactions, particularly in ring-closing (RCM), ring-opening (ROM), ring-opening metathesis polymerization (ROMP) and cross metathesis (CM) in high yield. The invention also relates to preparation of new ruthenium complexes and the use in metathesis.
Owner:ZANNAN SCITECH
Fluorescent probe used for detecting glutathione as well as preparation method and application thereof
InactiveCN104710979AEliminate the influence of background differences on the resultsHigh sensitivityOrganic chemistryBiological testingFluorescenceChemistry
The invention discloses a fluorescent probe used for detecting glutathione as well as a preparation method and application thereof. According to the invention, 1, 8-naphthalimide is used for building a classical ICT system, a phenyl sulfone part is introduced to the position of 4-, the ICT effect of a probe molecule is regulated and controlled, and due to the strong attracting electron effect of the phenyl sulfone in the position of the 4-, the probe molecule self is free from fluorescence emission. In case of the existence of glutathione, the phenyl sulfone part can be replaced by the glutathione, further the intramolecular electron transfer from sulphur atom in the position of the 4- (from glutathione) to the 1,8-naphthalimide can be generated, moreover, the ICT effect enables the probe molecule to send out strong fluorescence. The fluorescent probe provided by the invention can realize detection to the glutathione in cells, and has the advantages of being convenient and simple to operate, low in cost, sensitive in response, easy for popularization and application and the like.
Owner:ZHEJIANG SCI-TECH UNIV
Ionic iron (III) complex containing bisphenol functional imidazoline salt and application thereof
InactiveCN102887923AFlexible regulationEasy to purifyOrganic-compounds/hydrides/coordination-complexes catalystsIron organic compoundsStructural formulaEthyl Chloride
The invention discloses an ionic iron (III) complex containing bisphenol functional imidazoline salt, which is expressed by the following chemical structural formula shown in the specification, wherein R1 and R2 are respectively one of hydrogen atom, methyl and tert-butyl; and X is one of chlorine or bromine. According to the ionic iron (III) complex containing bisphenol functional imidazoline salt, such structural unit as imidazoline is first introduced into the design and synthesis of a ligand; meanwhile, the flexible and variable regulation and control on the steric hindrance and electronic effect of the corresponding iron (III) complex is realized by introducing a structure-variable phenoxy modification radical onto the imidazoline ring, thus developing a novel efficient iron-based catalyst; and the cross coupling reaction of alkyl primary / secondary bromohydrocarbon and alkyl primary / secondary chlorohydrocarbon can be effectively catalyzed.
Owner:SUZHOU UNIV
Aza cyclic carbine rear earth catalyst for crystallinity 3,4-polyisoprene
ActiveCN101157737AHigh molecular weightNarrow molecular weight distributionChlorobenzeneReaction temperature
The present invention relates to a nitrogen heterocyclic carbene rare earth complex, a catalyst system which consists of the present invention, aluminum alkyl and an organoboron salt can catalyse the isoprene to carry out the solution polymerization, so as to prepare the polyisoprene with the crystallization property, high 3, 4-structure and high glass transition temperature (Tg). The molar ratio of aluminum alkyl and the rare earth complex is within the scope of 1 to 100, the molar ratio of the organoboron salt and the rare earth complex is within the scope of 0.5 to 2.0; the solvent which is used for polymerization can be toluene, bromobenzene, n-hexane, dichloromethane or chlorobenzene; the polymerization temperature range is -20 DEG C to 80 DEG C, the reaction time of polymerization at minus 20 DEG C is 36 hours, the reaction time of polymerization at 80 DEG C is 1 hour, and the monomer conversion rate can be up to 100 percent. The reaction is characterized by active polymerization, the molecular weight of the product can be controlled by the molar ratio of the monomer and the catalyst, the molecular weight of the polyisoprene can achieve 360,000 at most, and the glass transition temperature Tg is equal to 5 DEG C to 50 DEG C. The content of the 3, 4 structure of the polyisoprene is affected by the spatial effect and the electronic effect of the rare earth complex, the solvent type for polymerization reaction and the polymerization reaction temperature and so on, which is changed between 76 percent and 99 percent.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Metallocene complex, preparation method thereof and catalyst composition
ActiveCN104558058AHigh activityHigh insertion rateGroup 3/13 element organic compoundsMetallocenesSide chainHigh activity
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Modular packaging arrangements and methods
InactiveUS6888064B2Maximizing board space savingRich varietySemiconductor/solid-state device detailsSolid-state devicesEngineeringElectronic effect
The present invention relates generally to chip packaging and methods of packaging and, more particularly, to compact packaging of chips and methods thereof in electronic environments that minimize undesired electronic effects, promote speed, and enhance packaging versatility.
Owner:IBM CORP
Crosslinked Hydrogels and Related Method of Preparation
InactiveUS20120321585A1Slow down crosslinking reactionReaction is slowSenses disorderDrug photocleavageArylBiopolymer
The present invention provides a method of manufacturing a hydrogel comprising the step of crosslinking a biopolymer using a carbodiimide crosslinker of Formula I wherein at least one of R1 and R2 is a functional group that is a bulky organic functional group. R1 and R2 can each independently be an optionally substituted saturated or unsaturated functional group selected from the group consisting of an alkyl, a cycloalkyl, a heterocyclic, and an aryl. The bulky organic functional group will slow down the crosslinking reaction of carbodiimide due to the steric effects and / or electronic effects, in comparison to a crosslinking reaction using EDC. Also provided are the hydrogels and ophthalmic devices prepared using the method of the invention and uses thereof.
Owner:OTTAWA HOSPITAL RES INST +1
Application of o-methyl-anilino lithium in catalysis of aldehyde and borane hydroboration
InactiveCN108659027AEfficient hydroboration reactionReduce pollutionOrganic-compounds/hydrides/coordination-complexes catalystsCatalytic reactionsLithiumBottle
The invention discloses application of o-methyl-anilino lithium in the catalysis of aldehyde and borane hydroboration. Borane is added into a reaction bottle that is dewatered and deoxidized in an inert gas atmosphere in an anhydrous oxygen-free environment; the catalyst, o-methyl-anilino lithium, is added; mixing is performed well before an aldehyde is added; hydroboration is carried out; the reaction is ended after exposure to air so as to obtain borates; the aldehyde is selected from aromatic aldehydes and heterocyclic aldehydes. The catalyst disclosed herein is well applicable to aromaticaldehydes and heterocyclic aldehydes having different substitution positions and electronic effects; more choices are provided to attain borates with different substituent structures.
Owner:SUZHOU UNIV
Method for synthesizing supported ternary platinum alloy catalyst
A method for synthesizing a supported ternary platinum alloy catalyst belongs to the technical field of chemical energy sources.A transition metal is introduced to a platinum catalyst and can adjust spacing of platinum atoms and change an electronic environment around platinum, and unique geometric effect and electronic effect will be resulted in.This change will directly affect adsorption activation energy of platinum surface with an oxygen bearing substance, thus affecting catalytic activity of platinum.
Owner:BEIJING UNIV OF TECH
Holographic sensor
Owner:CAMBRIDGE ENTERPRISE LTD +1
Electronic-clogging experiment device of geotextile
InactiveCN103808642AHighlight substantiveAccurate assessment of cloggingPermeability/surface area analysisEngineeringPermeameter
The invention relates to an electronic-clogging experiment device of a geotextile. The device consists of three parts, namely, a penetration test main body device consisting of an experiment table, a permeameter, a piezometer tube and a water head scale, a constant water head supply device consisting of a bracket, an auxiliary water inlet container, a valve, a water supply tube, a constant water head inlet container, a water outlet tube, a constant water head outlet container and an overflowing tube, and a voltage loading device consisting of a direct current power supply, an insulating lead, a metal bolt and a drilling circular metal electrode. By using the penetration test main body device and the penetration test main body device, continuous hydraulic power penetration tests with different hydraulic power gradients can be performed to the geotextile, and continuous electric penetration tests with different hydraulic power gradients can be performed to the geotextile by applying a uniform direct current electric field inside the permeameter through the voltage loading device, so that the influence on the clogging of the geotextile caused by electronic effect can be studied.
Owner:王军
High-performance oxygen reduction catalyst based on surface function enhancement and preparation method thereof
PendingCN109950566AUniform particle sizeEvenly distributedMaterial nanotechnologyFuel and primary cellsReaction rateDesorption
The invention discloses a high-performance oxygen reduction catalyst based on surface function enhancement provides a preparation method of the above catalyst. The catalyst is a HCM / Pt / C catalyst witha core-shell structure, the material of the shell is a porous heteroatom-doped carbon material coating the surface of a Pt active center. Since the heteroatom-doped carbon material has a special adsorption-enrichment effect on oxygen, the material can provide an oxygen-rich environment for an active site, the collision frequency of reaction gas oxygen and the active site is increased, and the kinetic reaction rate of an oxygen reduction reaction is greatly improved. At the same time, the electronic effect at a HCM / Pt interface optimizes the electronic structure of Pt, so that the adsorption of Pt on an oxygen reduction reaction intermediate is weakened, and the desorption rate is increased to provide a site for subsequent oxygen adsorption. On the other hand, a carbon shell around Pt particles prevents migration and agglomeration, and the overall stability of the catalyst is greatly improved.
Owner:江苏介观催化材料科技有限公司
Silicon-bridged metallocene complexes containing indenoindole structure and application of silicon-bridged metallocene complexes
The invention relates to a preparation method and application of a catalyst for an olefin polymerization reaction, especially to a preparation method and application of silicon-bridged metallocene complexes containing an indenoindole structure. According to the invention, molecules of the novel silicon-bridged metallocene complex containing the indenoindole structure designed by the invention contain various different substituted indenyl groups, so different chemical environments are provided for central metal, and metallocene complexes with a novel structure is constructed. By changing a skeleton structure and substituent groups, the three-dimensional effect and the electronic effect of the metallocene complex can be conveniently regulated and controlled, catalytic performance is regulated and controlled, and polyolefin high polymer materials with different structures and properties are prepared.
Owner:山东清河化工科技有限公司
Olefin Polymerization Catalyst Components
The invention relates to an olefine polymerization catalyst component, which comprises a special unsaturated heterocyclic maleicamide compound serving as an internal electron donor of a general formula (I). The unique electronic effect and stereohindrance effect of the maleicamide compound improves the properties of the catalyst; therefore, when the maleicamide compound is used in polymerization (copolymerization) of propylene, the catalyst demonstrates higher activity, stereospecificity and hydrogen regulation sensitivity, and the molecular weight distribution of a polymer is wide, which is favorable for the development of polymers with different trade marks.
Owner:PETROCHINA CO LTD
Application of n-butyllithium in catalyzing hydroboration of aldehyde and borane
InactiveCN108404984AReduce electropositivityWeakened nucleophilic addition activityOrganic-compounds/hydrides/coordination-complexes catalystsGroup 3/13 element organic compoundsN-ButyllithiumOxygen
The invention discloses application of n-butyllithium in catalyzing hydroboration of aldehyde and borane, a method of hydroboration comprises the following steps of in a water-free and oxygen-free environment, under the inert gas atmosphere, adding borane into a reaction bulb subjected to dehydration and deoxidization treatment, then adding a catalyst n-butyllithium, uniformly mixing, then addingaldehyde to perform hydroboration. Exposing to the air to stop the reaction after the reaction is finished, so as to obtain a product. The catalyst disclosed by the invention has better universality to aromatic aldehyde with different replace positions and different electronic effects as well as to heterocyclic aldehydes and fatty aldehyde, and more choice can be provided for obtaining boric acidester compounds with different substituent group structures.
Owner:SUZHOU UNIV
Post-processing method for carbon-supported Pt-Fe catalyst
InactiveCN103990468AOvercome the problem of low stabilityLarge particle sizeCell electrodesCatalyst activation/preparationCatalytic oxidationElectron
The invention provides a post-processing method for carbon-supported Pt-Fe catalyst, belongs to the field of catalyst post-processing methods, and overcomes the defects that the conventional post-processing method for the carbon-supported Pt-Fe catalyst is harsh in conditions and complex. The method comprises the following steps: immersing the carbon-supported Pt-Fe catalyst into sulfuric acid solution, and stirring at 70 to 90 DEG C to obtain suspension liquid; cooling, washing and drying the suspension liquid to obtain chemically de-alloyed carbon-supported Pt-Fe catalyst. According to the method, Fe on the surfaces of carbon-supported Pt-Fe nano-particles is removed in the sulfuric acid solution by controlling reaction conditions, the catalytic oxidation effect of Pt on methanol is improved by utilizing the strong electronic effect of the Fe in the carbon-supported Pt-Fe catalyst on the Pt, and meanwhile, the problem that the stability of the Pt-Fe catalyst is low is solved. The quality specific activity of the chemically de-alloyed carbon-supported Pt-Fe catalyst prepared by the invention can reach 514 mA / mg<2>; through four-hour timing current test, 45.4 percent of catalytic performance can be remained.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Novel oxygen evolution electrocatalyst as well as preparation method and application thereof
ActiveCN111167480AImproving the performance of electrocatalytic oxygen evolutionPhysical/chemical process catalystsElectrodesPtru catalystThiourea
The invention discloses a novel oxygen evolution electrocatalyst as well as a preparation method and application thereof, which comprises the following steps: (1) dissolving nitrate of metal elementsin a P region into a solvent to obtain a solution A, dissolving thiourea in a solvent to obtain a solution B, dropwise adding the solution B into the solution A, fully stirring and uniformly mixing the mixture, and transferring the mixture into a reaction kettle; and (2) vertically putting the cleaned and dried metal Ni foam into a reaction kettle, carrying out solvothermal reaction to obtain a heterojunction, repeatedly washing the heterojunction with deionized water and ethanol for several times, and drying the product in a vacuum box to obtain the novel oxygen evolution electrocatalyst. According to the preparation method, the electro-catalytic performance is remarkably improved by a P-region element asymmetric SP3 hybridization induced electron effect; by means of a simple, convenientand mild solvothermal method, a Ni foam net is used as a substrate and a Ni source, and a P-region element Bi or Sb induces to prepare a flexible self-assembled succulent Bi2S3 / Ni3S2 / NF or Sb2S3 / Ni3S2 / NF heterojunction working electrode for electrocatalytic oxygen evolution reaction. The Bi2S3 or Sb2S3 has a unique asymmetric SP3 hybrid modulation heterojunction electronic structure, so that the electro-catalytic performance is improved.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
(E)-alkenyl sulfone compound and preparation method thereof
InactiveCN107162943AGood substrate compatibilityHigh yieldOrganic compound preparationOrganic chemistry methodsOrganic solventCopper
The present invention relates to a (E)-alkenyl sulfone compound and a preparation method thereof. The preparation method comprises: dissolving a benzenesulfonyl hydrazide-based substrate and a phenylpropiolic acid substrate in an organic solvent, adding a copper catalyst, and carrying out a reaction by using oxygen in air as an oxidizing agent so as to obtain the (E)-alkenyl sulfone compound, wherein the chemical formula is defined in the specification. Compared to the method in the prior art, the method of the present invention has the following characteristics that the finally required (E)-alkenyl sulfone compound can be obtained with the inexpensive catalyst Cu2O and the green oxidant O2 without the additional additives, and the method provides good compatibility for the substrates having different electronic effects and steric hindrance on the aromatic ring, and has high yield.
Owner:TONGJI UNIV
Supported alloy catalyst as well as preparation method and application thereof
ActiveCN111841531AGood ammonia decomposition performanceImprove low-temperature ammonia decomposition performanceCatalyst activation/preparationHydrogen productionBoridePtru catalyst
The invention belongs to the technical field of catalytic materials, and particularly relates to a supported alloy catalyst and a preparation method and application thereof. The method comprises the following steps of: mixing a mixed solution of an active metal salt and a carrier metal salt with an alkaline solution, carrying out a first reaction, and controlling the pH value of the system to 9.0-11.0 to obtain a turbid liquid; adding a phosphorus source or a boron source into the turbid liquid, carrying out a second reaction, and carrying out separation and vacuum drying on a reaction productto obtain an amorphous catalyst precursor; and roasting the obtained amorphous catalyst precursor in an inert atmosphere to obtain the supported alloy catalyst. According to the method, the supportedalloy catalyst having a specific structure and taking metal phosphide or boride as an active component is prepared by using an amorphous alloy material as a precursor, and due to the fact that nonmetal boron or phosphorus generates an electronic effect on metal, the electronic characteristic and the surface property of the supported alloy catalyst are changed, and then the ammonia decomposition performance of the catalyst is improved.
Owner:福大紫金氢能科技股份有限公司
Molecule acid and alkaline dissociation constant prediction method based on layered atomic addition model
InactiveCN101419214AAccurate predictionImprove fitting abilitySpecial data processing applicationsTesting medicinal preparationsFree energiesPredictive methods
The invention relates to a brand new method for predicting the acid-base dissociation constant (pKa) of organic small molecules based on a hierarchical atom additive model. Based on the linear relationship rule of free energy changes of acid-base dissociation balance at a given temperature, the method firstly establishes the hierarchical atom additive model based on a Hammett-Taft equation and a processed substituent effect of 'dissociation center-rest part' brought forward by Cherkasov and the like, and then calculates the acid-base dissociation constant (pKa) value of a corresponding compound according to the concrete structure of the compound through the model. The method does not have the difficulties of large number of substituent electronic effect constants and correction factors relating existing in the prior method, ensures the speediness and accuracy of the prediction, shows good data fitting and predictive ability on a plurality of sample sets, breaks through the prior method which studies the drug pKa at an early research and development stage of a new drug, reduces the drug research and development cost on a large scale, and improves the discovery efficiency of the new drug.
Owner:SHANGHAI INST OF MATERIA MEDICA CHINESE ACAD OF SCI
Preparation and application of carbon-supported amorphous metallic nickel
InactiveCN102614880AImprove stabilityHigh activityCell electrodesMetal/metal-oxides/metal-hydroxide catalystsCO poisoningMetallic materials
The invention provides a preparation method for carbon-supported amorphous metallic nickel, which belongs to the technical field of metallic materials. The carbon-supported amorphous metallic nickel provided in the invention is prepared by using NiCl2.6H2O and ethylene diamine tetraacetic acid as raw materials and employing a hydrothermal process for reduction; amorphous metallic nickel has good dispersibility and a small specific surface area on a carbon support; a fuel cell noble metal catalyst using amorphous metallic nickel as a precursor has the characteristics of good stability, high activity, a long service life and the like, shows good catalytic activity during the process of catalytic oxidation of the anode of a fuel cell and is a high performance catalyst for a fuel cell. Since amorphous metallic nickel can produce electronic effects and synergism together with noble metal atoms (e.g., platinum atoms, palladium atoms, platinum-ruthenium atoms and the like), the catalysis effect of the catalyst is promoted, resistance to CO poisoning of the catalyst is enhanced, the usage amount of noble metals is effectively reduced, and cost for the catalyst is reduced.
Owner:NORTHWEST NORMAL UNIVERSITY
Homojunction combined gate field effect transistor
InactiveCN1953206AIncrease drive currentImprove transconductanceSemiconductor devicesDriving currentEngineering
The invention relates to a composite grid field effect transistor. Wherein, the grid, source, leak and substrate form the main body; the insulated layer is between grid and substrate; the groove is on the substrate between source and leak; the source extends shallow source extending area at the left end of groove; the grid extends shallow leak extending area at the right end; the invention is characterized in that the grid is composite grid and multi-crystal grid, while the left and right parts are different in conductive types; the left grid toward to source is P-type multi-crystal grid, while the left part toward leak is N-type multi-crystal grid. The invention can obtain radio MOSFET driving current, transconductance and cut-off frequency, and release the maximum field strength, thermal electronic effect and short-groove effect at the end of leak drift area.
Owner:ANHUI UNIVERSITY
Polyurethane resin for shoes
The invention discloses polyurethane resin for shoes, comprising a component (A) and a component (B). The polyurethane resin for shoes is characterized in that the component (A) comprises 100 parts of polyester polyol and 8-30 parts of ethylene glycol and / or butanediol, the component (B) comprises 40-60 parts of 3,3'-dimethyl-4,4' diphenyl diisocyanate and 30-45 parts of polyester polyol and / or polyether glycol. A finished product prepared by substituting TODI (3,3-Tolidine-4,4-Diisocyanate) for MDI (4,4'-Diphenylmethane Diisocyanate) through a foaming reaction has the matter properties, suchas excellent compression ratio, better wear resistance, bending resistance, tensile strength, tearing strength, and the like under low density. Because of the steric hindrance effect and the electronic effect of 3,3'-dimethyl-4,4'diphenyl diisocyanate methyl-o-side, the activity of the polyurethane resin is weaker than the activity of the diphenylmethane diisocyanate, and the prepared prepolymer is stable and mild in the foaming reaction without generating a bubble falling phenomenon. Because the activity of the TODI reaction is weaker than that of the MDI reaction, the storage stability of the isocyanate combination liquid is greatly improved.
Owner:山东崇舜新材料科技有限公司
Long-arm benzoic acid rare earth luminescent material and preparation method thereof
ActiveCN104449672ABest coordination spaceComplete structureLuminescent compositionsBenzoic acidAcetic acid
The invention discloses a long-arm benzoic acid rare earth luminescent material. The long-arm benzoic acid rare earth luminescent material is as shown in a structural formula of Ln(BA CE-R)m(L2)n. The invention also provides a preparation method of the long-arm benzoic acid rare earth luminescent material. The preparation method is characterized in that a reactant of benzoic acid with different substituents and glycollic acid serves as a matrix for preparing a long-arm benzoic acid ligand with different electronic effects and adjustable coordination spaces; the novel ligand is coordinated with rare earth ions to prepare the long-arm benzoic acid rare earth luminescent material. The long-arm benzoic acid rare earth luminescent material is high in luminescent intensity, high in heat stability (under the temperature of 340 DEG C) and high in light stability and is a valuable luminescent material; in addition, long-arm benzoic acid rare earth luminescent material shows three obvious excitation peaks (310nm, 396nm and 466nm), so that the long-arm benzoic acid rare earth luminescent material is a rare multi-excitation luminescent material and can be widely applied to the fields of biomarkers, electronic counterfeiting and displaying imaging.
Owner:TIANJIN POLYTECHNIC UNIV
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