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110 results about "Binary complex" patented technology

Graphene/polyaniline/cobalt composite wave-absorbing material and preparation method

The invention relates to a graphene/polyaniline/cobalt composite wave-absorbing material and a preparation method thereof, belonging to the field of preparing an electromagnetic wave absorption material. The wave-absorbing material comprise a film forming material and an electromagnetic wave absorbent, wherein paraffin is adopted as the film forming material, a graphene/polyaniline/cobalt ternary complex is adopted as the electromagnetic wave absorbent, and the mass ratio of the graphene/polyaniline/cobalt ternary complex to the paraffin is 1:1. The preparation method of the material comprises the following steps: (1) preparing graphite oxide; (2) preparing the graphene/polyaniline binary complex; (3) preparing the graphene/polyaniline/cobalt ternary complex; (4) weighing graphene/polyaniline/cobalt ternary complex and paraffin, and evenly mixing to obtain a graphene/polyaniline/cobalt wave-absorbing material. The material has the characteristics of being low in cost, simple in preparation technology, strong in electromagnetic wave absorption capability, wide in absorption frequency band, small in density and the like, achieves good electromagnetic property and stability, and has important application values in the fields of microwave absorption and electromagnetic shielding.
Owner:UNIV OF SCI & TECH BEIJING

Expandable graphite/polyaniline/cobalt ferrite wave-absorbing material and preparation technology thereof

InactiveCN102604395AStrong dielectric loss performanceLow densityInorganic material magnetismTernary complexAlcohol
The invention discloses an expandable graphite/polyaniline/cobalt ferrite wave-absorbing material with an anti-electromagnetic interference function and a preparation technology thereof. The invention aims to provide an expandable graphite/polyaniline/cobalt ferrite wave-absorbing material which has strong electromagnetic wave absorbing capability and wide absorption frequency bandwidth and is convenient to use without causing environmental pollution and a preparation technology thereof. According to the invention, the wave-absorbing material consists of paraffin serving as a film forming material and an expandable graphite/polyaniline/cobalt ferrite ternary complex serving as an electromagnetic wave absorbent. The preparation technology of the expandable graphite/polyaniline/cobalt ferrite wave-absorbing material comprises the following steps of: (1) preparing expandable graphite; (2) preparing absolute ethyl alcohol containing expandable graphite; (3) preparing an expandable graphite/polyaniline binary complex; (4) preparing the expandable graphite/polyaniline/cobalt ferrite ternary complex; and (5) weighing the expandable graphite/polyaniline/cobalt ferrite ternary complex and the paraffin, uniformly mixing the expandable graphite/polyaniline/cobalt ferrite ternary complex and the paraffin and performing ball milling to obtain the expandable graphite/polyaniline/cobalt ferrite wave-absorbing material.
Owner:ZHEJIANG NORMAL UNIVERSITY

Fly ash-based inorganic polymer composite cementitious material and preparation method thereof

The invention relates to a fly ash-based inorganic polymer composite cementitious material and a preparation method thereof, and the fly ash-based inorganic polymer composite cementitious material comprises the following raw materials: 1350g of fly ash, 150g of silicon powder, 225 or 300g of sodium silicate and 307 or 264g of water (water + crystal water in Na2SiO29H2O: fly ash and silicon powder is equal to 0.29), wherein the doping amount of butyl acrylate-acrylic resin emulsion is 0.5%-3% of the weight of the fly ash and the silicon powder. The fly ash-based inorganic polymer composite cementitious material is prepared by using the sodium silicate for exciting the binary complex fly ash and the silicon powder at room temperature or doping the butyl acrylate-acrylic resin emulsion into the binary complex fly ash and the silicon powder excited by the sodium silicate at the room temperature. The optimal compressive strength at the age of 28 days is improved by 10.43MPa in comparison with a binary complex fly ash-based inorganic polymer, and the flexural strength at the age of 28 days is improved by 2.52MPa. The doping of the butyl acrylate-acrylic resin emulsion can significantly improve the compressive strength and the flexural strength of the fly ash-based inorganic polymer composite cementitious material; and the preparation process is carried out under normal temperature and normal pressure and has the advantages of zero emission, greenness and environmental protection.
Owner:XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY

Silicon nano wire-fullerene complex cathode material for lithium ion battery and preparation method thereof

The invention discloses a silicon nano wire-fullerene complex cathode material for a lithium ion battery and a preparation method thereof. Fullerene flexible conductive particles and silicon nano wires form a binary complex together; and the silicon nano wires are used as a main body for storing lithium, and the fullerene flexible conductive particles are supported on the surfaces of the silicon nano wires to form a topological netlike structure consisting of silicon nano wire arrays and fullerene. According to the topological netlike structure characteristics of the silicon nano wire-fullerene complex cathode material for the lithium ion battery, in the complex structure, the flexible conductive fullerene supported granules have double functions, wherein on one hand, volume expansion of silicon in the lithium embedding process can be buffered by a large amount of gaps among the fullerene and excellent elasticity of the fullerene so as to block the fusion of the adjacent silicon nano wires; and on the other hand, the fullerene can be used as a connector of the silicon nano wires to realize multi-channel migration of lithium ions, so the complex cathode material has more excellent cyclical stability and charge/discharge performance compared with the traditional silicon cathode material.
Owner:XIANGTAN UNIV

Novel aromatic prenyltransferases, nucleic acids encoding same and uses therefor

ActiveUS20060183211A1Sugar derivativesMicrobiological testing/measurementPrenyltransferase activityIsoprene
In accordance with the present invention, a novel aromatic prenyltransferase, Orf2 from Streptomyces sp. strain CL190, involved in naphterpin biosynthesis has been identified and the structure thereof elucidated. This prenyltransferase catalyzes the formation of a C—C bond between a prenyl group and a compound containing an aromatic nucleus, and also displays C—O bond formation activity. Numerous crystallographic structures of the prenyltransferase have been solved and refined, e.g., (1) prenyltransferase complexed with a buffer molecule (TAPS), (2) prenyltransferase as a binary complex with geranyl diphosphate (GPP) and Mg2+, and prenyltransferase as ternary complexes with a non-hydrolyzable substrate analogue, geranyl S-thiolodiphosphate (GSPP) and either (3) 1,6-dihydroxynaphthalene (1,6-DHN), or (4) flaviolin (i.e., 2,5,7-trihydroxy-1,4-naphthoquinone, which is the oxidized product of 1,3,6,8-tetrahydroxynaphthalene (THN)). These structures have been solved and refined to 1.5 Å, 2.25 Å, 1.95 Å and 2.02 Å, respectively. This first structure of an aromatic prenyltransferase displays an unexpected and non-canonical (β/α)-barrel architecture. The complexes with both aromatic substrates and prenyl containing substrates and analogs delineate the active site and are consistent with a proposed electrophilic mechanism of prenyl group transfer. These structures also provide a mechanistic basis for understanding prenyl chain length determination and aromatic co-substrate recognition in this structurally unique family of aromatic prenyltransferases. This structural information is useful for predicting the aromatic prenyltransferase activity of proteins.
Owner:SALK INST FOR BIOLOGICAL STUDIES

Process for preparing cellulose long-chain fatty acid ester

The invention discloses a method which can rapidly prepare a cellulosic long-chain fatty acid ester, and the method has the advantages of few steps of preparation, simple and easy operation and environmental protection. The technical scheme has two steps; firstly, cellulose accouting for two to four percent of the mass of dimethylacetamide and lithium chloride accounting for six to nine percent of the mass of the dimethylacetamide are added into the dimethylacetamide and undergo ultrasound with the frequency of 20 to 25 KHz and the power of 400 to 800 w for five to thirteen minutes, and after three to five hours of stirring under the environment of nitrogen gas, cellulosic ion solution A is prepared; secondly, according to the molar ratio of 1:2:2:0 to 1:6:6:1, cellulose, long-chain fatty acid, co-reagent and / or catalyst are added into the solution A, which is irradiated by a microwave reaction instrument with power of 300 to 400 w for sixty to one hundred seconds and is stired under the protection of nitrogen gas, stirring is continued for one to three hours after microwave irradiation, and after washing and drying, the cellulosic long-chain fatty acid ester is produced. Reaction time is short, yield rate is high, and binary complex solution does not need to be prepared.
Owner:INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY

Organic-inorganic composite phase-change energy-storage gypsum building block

The invention discloses an organic-inorganic composite phase-change energy-storage gypsum building block. The organic-inorganic composite phase-change energy-storage gypsum building block comprises a coal-series kaolin-based composite phase-change material, desulfurated building gypsum and a foaming agent, wherein the mass of the coal-series kaolin-based composite phase-change material is 3 to 20% of the total mass of the organic-inorganic composite phase-change energy-storage gypsum building block, and the mass of the foaming agent is 0.1 to 1.0% of the total mass of the organic-inorganic composite phase-change energy-storage gypsum building block. The coal-series kaolin-based composite phase-change material comprises 80 to 95% of coal-series kaolin and 5 to 20% of an organic phase-change material which is a binary complex of decanoic acid and lauric acid, wherein a decanoic acid mass percentage is in a range of 10 to 90%. The binary complex of decanoic acid and lauric acid has a phase-change temperature of 19 to 27 DEG C, and phase-change latent heat of 156.9 to 206.4KJ/Kg. A primary intercalation material of the coal-series kaolin is hydrazine. The organic phase-change material is inserted between layers of the coal-series kaolin through secondary intercalation replacement. The organic-inorganic composite phase-change energy-storage gypsum building block has the advantages of low price, low heat conduction coefficient, moderate phase-change temperature, large volume latent heat and low energy consumption.
Owner:YANCHENG INST OF TECH
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