36results about How to "Change charge distribution" patented technology

The invention discloses a preparation method and application of pH-responsive amino sodium lignosulphonate. The preparation method comprises the following steps: dissolving sodium lignosulphonate in water to prepare a sodium lignosulphonate water solution, regulating the pH of the solution to be 10-13, and activating at 50-70 DEG C for 0.5-1.0 hour; adding an amination modifier, dropwise adding an aldehyde reagent, and reacting at 70-90 DEG C for 2-4 hours after the dropwise adding, so as to obtain an amino sodium lignosulphonate water solution; extracting the obtained amino sodium lignosulphonate water solution by virtue of an alcohol reagent, washing residual solids by virtue of petroleum ether after the extraction, and carrying out freeze drying on washed remnants. The amino sodium lignosulphonate prepared by virtue of the preparation method has remarkable pH response characteristic; by regulating the pH of the water solution of the product, the molecular configuration and the aggregation extent of the product can be changed, and a regular nanoparticle structure can be spontaneously formed; the amino sodium lignosulphonate can be used as a wall material to be applied field of pesticide microcapsules and is hopefully applied to the field of lignin-based nanometer materials.

The invention provides a nitrogen-doped carbon nano composite material coated by hollow copper doped monocrystalline silicon and a preparation method. The nitrogen-doped carbon nano composite materialcoated by hollow copper doped monocrystalline silicon is characterized by comprising a hollow nitrogen-doped carbon material, the hollow nitrogen-doped carbon material is externally coated with copper doped cobaltous nickel oxide. The prepared composite material has the characteristic of uniform structure and morphology, the ZIF-67 and polyaniline derived hollow nitrogen-doped porous carbon material supports the hollow polyhedral structure of the composite material, a doped copper element changes charge distribution of the eigenstate of cobaltous nickel oxide, and its catalytic performance isimproved; the copper doped cobaltous nickel oxide uniformly grow outside the hollow nitrogen-doped carbon material, and the problem is avoided that metallic oxide is easy to agglomerate. The nitrogen-doped carbon nano composite material has the advantages of being large in specific surface area, good in electrical conductivity, stable in physicochemical property, superior in electrochemical performance and the like.

The invention discloses a cobalt-nickel-nitrogen sulfide-doped carbon nanofiber composite rich in sulfur vacancies and a preparation method thereof. The preparation method of the composite comprises the steps of pre-oxidizing a polyacrylonitrile nanofiber membrane obtained by electrostatic spinning and then carbonizing the polyacrylonitrile nanofiber membrane at the high temperature to obtain a nitrogen-doped carbon material; enabling Ni-Co precursor nanowires to grow in situ with the nitrogen-doped carbon material as a carrier; adopting an annealing process for obtaining a cobalt-nickel-nitrogen oxide-doped carbon nanofiber composite, and obtaining the cobalt-nickel-nitrogen sulfide-doped carbon nanofiber composite rich in sulfur vacancies through further vulcanization and annealing treatment. The composite prepared by means of the method has the advantages of uniform structure and appearance, high-conductivity nitrogen-doped carbon nanofibers are used as a substrate, a sulfur vacancy-doped cobalt-nickel sulfide uniformly grows outside the hollow nitrogen-doped carbon material, the agglomeration problem of cobalt-nickel sulfides is avoided, and the composite has the advantages oflarge specific surface area, high conductivity, stable physical and chemical properties, excellent electrochemical performance and the like.

The invention discloses a method for detecting acetyl choline by a fluorescence ratio. The method comprises the following steps of step1, preparing multiple standard solutions with the same volume, having the same concentrations of acetylcholin esterase, choline oxidase, horse radish peroxidase, o-phenylenediamine and carbon quantum dots, and having the different concentrations of acetyl choline;step 2, detecting the fluorescence intensities I442 and I573 of the multiple standard solutions at 442nm and 573nm, and building a linear relation between the I573/I442 and the acetyl choline concentration; and step 3, preparing a solution to be detected with the unknown acetyl choline concentration, detecting the fluorescence intensities I442 and I573 of the solution at 442nm and 573nm, and thuscomputing the acetyl choline concentration in the solution to be detected according to the linear relation acquired in the step 2. The method provided by the invention has the advantages of simple operation, quick detection, high sensitivity and the like.

The invention provides a preparation method and application of a silver/zinc oxide composite material, and relates to the technical field of preparation and application of zinc oxide photocatalysts. Zinc acetate, silver nitrate, L-aspartic acid, diethanol amine and deionized water are uniformly mixed and then placed into a reaction kettle for hydrothermal reaction, and the product is washed and dried to obtain the silver/zinc oxide composite material. It is found that the effect of the silver/zinc oxide composite material is much better than that of zinc oxide through photocatalytic experiments of methyl orange and rhodamine B. It is found that rodlike zinc oxide can be assembled into a rule body better, change the distribution of electric charge of the surface of the zinc oxide, and improve photo-induced electron space of the zinc oxide after Ag loading through tests of a scanning electron microscope, an X-ray diffraction spectrogram, an ultraviolet-visible absorption spectrogram andthe like, the comparison with a microstructure of the zinc oxide and the analysis of ZnO and Ag/ZnO from a growth mechanism and a photocatalytic mechanism. In general, Ag loading has a good effect onthe performance improvement of the zinc oxide.

The invention discloses a charge-reversed DNA (Deoxyribose Nucleic Acid) nano-carrier and a preparation method and application thereof, and belongs to the fields of gene treatment and DNA vaccine antibody expression. The charge-reversed DNA nano-carrier comprises a compound prepared from methylsuccinic acid-3-dimethylamino-1-propyl ester quaternary ammonium salt and pDNA, has different quantities of electric charges under different pH conditions, and can be subjected to charge reversing under a corresponding PH condition. The prepared charge-reversed compound has a pH response, has different quantities of electric charges under different pH conditions through the methylsuccinic acid-3-dimethylamino-1-propyl ester quaternary ammonium salt, and is subjected to charge reversing under a certain PH condition, and a nano-compound carries positive charges when the compound passes through the surface of a cell membrane carrying negative charges, so that the compatibility with the cell membrane is very high, the compound can be effectively internalized, the electric charges are reversed under different pH conditions in cells, and a carrier carrying the negative charges can circulate for a long time more easily and is more suitable to be applied in gene treatment and antibody production.

The invention discloses a method for catalyzing selective hydrogenation of 1,3-butadiene by using a CuPdPt catalyst, and belongs to the technical field of chemistry and chemical engineering. The method comprises the following steps: putting the CuPdPt catalyst into a tubular reactor, then raising the temperature of a catalyst bed to a certain temperature, then introducing a mixed gas of 1,3-butadiene and hydrogen into the reactor, adjusting the reaction conditions to a certain pressure and a certain airspeed, and carrying out a reaction. The CuPdPt catalyst is different from traditional supported catalysts, and is characterized in that the high-activity and high-stability supported CuPdPt catalyst for selective hydrogenation of 1,3-butadiene is prepared by adjusting the contents of metallic copper, palladium and platinum in the catalyst and the content of TiO2@C. When the catalyst is used for the selective hydrogenation reaction of 1,3-butadiene, the content of 1,3-butadiene in the product is lower than 670 ppb, and the content of butane is lower than 1.5%;and the catalyst still maintains a good catalytic activity after being continuously operated for 150 h.

The invention relates to a method for efficiently removing heavy metal pollutants on the basis of fluorinated zero-valent iron. The fluorinated zero-valent iron is characterized in that part of hydroxyl groups on the surface of zero-valent iron are substituted by fluorine or a fluorine-containing group and a sulfonic acid surfactant group. The usage is as follows: the fluorinated zero-valent ironis added into heavy metal pollutant water to remove heavy metals. The fluorinated zero-valent iron provided by the invention has good transfer capability, high electron selectivity and high utilization rate, and when being used for removing heavy metal pollutants, the fluorinated zero-valent iron has the advantages of high pollutant removal efficiency, easiness in operation and cost-efficiency.

The invention discloses a rhenium sulfide/nitrogen-doped biomass-based carbon fiber composite material with a double-defect structure. The preparation method is characterized in that rhenium sulfide nanosheets with interlayer defects grow on the surface of nitrogen-doped biomass-based carbon fiber in situ, and then, sulfur vacancies are introduced through annealing in a reducing Ar/H2 atmosphere,so that the rhenium sulfide/nitrogen-doped biomass-based carbon fiber composite material with a double-defect structure is obtained. The rhenium sulfide in the prepared composite material uniformly grows on the surface of the nitrogen-doped biomass-based carbon fiber, and the composite material has the advantages of large specific surface area, good conductivity, stable physical and chemical properties and the like. The one-dimensional interlayer defect structure provides interconnected channels so as to provide additional ion intercalation/deintercalation sites; besides, the vacancy-rich structure is beneficial to rapid adsorption of sodium ions and can change the charge distribution of the intrinsic state of the material, so that the purposes of increasing active sites and improving theconductivity of the material are achieved, and the material has excellent electrochemical performance.

The present invention belongs to the field of medicine, and particularly relates to applications of polydatin in preparation of neuron mitochondrion injury treating medicines, a medicine containing the polydatin, and a medicine preparation method. The present invention provides applications of polydatin in preparation of neuron mitochondrion injury treating medicines. According to the present invention, the polydatin provides significant effects in protection of neuron mitochondrion injury, and can be used for treating or preventing diseases related to neuron mitochondrion injury; the neuron mitochondrion protection effect of the polydatin is researched on the basis of the determination of the key role of the neuron mitochondrion injury in secondary brain injury, such that the target is clear, and the targeting property is strong; and compared to a variety of mitochondrion protection agents, the polydatin of the present invention has the following characteristics that the neuron mitochondrion protection effect of the polydatin is subjected to the multi-layer research, the design is cautious and reasonable, and the conclusion is reliable.

The invention relates to a modified diatomite microecological preparation and a preparation method thereof. The microecological preparation is prepared from the following raw materials in parts by weight: 15-25 parts of lactic acid bacteria, 9-14 parts of candida utilis, 9-13 parts of bacillus subtilis, 10-16 parts of enterococcus faecalis, 45-55 parts of diatomite, 9-13 parts of fructo-oligosaccharide, 8-13 parts of aspergillus niger, 5-8 parts of aspergillus oryzae, 5-9 parts of lactobacillus acidophilus, 20-25 parts of bifidobacteria, 5-10 parts of bacillus licheniformis, 0.5-2 parts of bean dregs, 5-10ml of acetic acid, 5-10 parts of FeCl3, and an appropriate amount of water. The lactic acid bacteria, the candida utilis, the bacillus subtilis and the enterococcus faecalis which are screened out are all adapted to grow under meta-acid environment, have strong resistance to animal intestinal mucosa and strong field planting capacity, and are high in reproductive performance; and through optimized arrangement of species, synergistic efficacy is sufficiently exerted, the decomposition of protein, fat and cellulose by metabolism products is strengthened, and the pH value in the animal intestines can be reduced by produced lactic acid and other organic acids, so that growth and propagation of other microorganisms are restrained, and the microecological preparation has a certain bacterial function.

The invention relates to a preparation method of an X-type molecular sieve/LDHs composite adsorbent for separating methane and nitrogen through pressure swing adsorption. The preparation method comprises the following steps: performing reaction and modification on an X-type molecular sieve and an anionic surfactant or anionic polyelectrolyte under a hydrothermal condition to make the surface of the X-type molecular sieve have negative charges, and compounding the X-type molecular sieve with LDHs to form a composite material according to the principle that anions between layers of LDHs can be plugged in a replacing manner. The preparation method has the beneficial effects that the X-type molecular sieve which is modified by the anions and is provided with the negative charges is plugged between the layers of LDHs, so that the adsorption function of the X-type molecular sieve is realized; furthermore, under the electrostatic effect between the X-type molecular sieve and LDHs laminate, the charge distribution of the X-type molecular sieve is changed, so that the adsorption effect of the X-type molecular sieve for N2 in a PSA process is greatly enhanced.

The invention relates to a method for enhancing luminescent properties of silver nanoclusters protected by double stranded DNA based on an aggregation induced luminescence enhancement mechanism, and belongs to the technical field of nano materials. Metal nanoclusters used in the method are the silver nanoclusters protected by the double stranded DNA, the double stranded DNA comprises G-C segments, by use of the mechanism of electrostatic interaction of phosphoric acid groups in the G-C segments and serum protein, BSA is used for ligand DNA aggregation to limit vibration rotation of the ligand double stranded DNA of the silver nanoclusters to reduce internal consumption so as to induce fluorescence enhancement: further Trypsin is added for hydrolysis of the BSA and change of charge distribution on the surface of the BSA to induce further ligand DNA aggregation so as to further enhance fluorescence of the silver nanoclusters, and the luminescent properties of the silver nanoclusters can be enhanced by the aggregation induced luminescence enhancement way. Further a complex formed by combination of the silver nanoclusters protected by the double stranded DNA and the BSA can be used for quantitative detection of the trypsin, and through calculation, the detection sensitivity can reach 2.8ng / mu L.

The invention discloses a method for catalyzing selective hydrogenation of 1, 3-butadiene by using a NiPdRu catalyst, and belongs to the technical field of chemistry and chemical engineering. The method comprises the following steps: putting the NiPdRu catalyst into a tubular reactor, heating a catalyst bed to a certain temperature, introducing a mixed gas of the 1, 3-butadiene and hydrogen into the reactor, and carrying out a reaction at a certain pressure and airspeed. Different from the traditional supported catalyst, the high-activity and high-stability supported NiPdRu catalyst for selective hydrogenation of the 1, 3-butadiene can be prepared by adjusting the contents of metal nickel, palladium and ruthenium and the content of TiO2@C in the catalyst according to the invention. When the catalyst is used for selective hydrogenation reaction of the 1, 3-butadiene, the content of the 1, 3-butadiene in the product is lower than 595ppb, the content of butane is lower than 1.2%, and thecatalyst still keeps good catalytic activity after continuous operation for 150h.

The invention discloses an LPEIS/pDNA/HA nano-carrier and a preparation method and application thereof, and belongs to the field of gene therapy and DNA vaccine antibody expression. The LPEIS/pDNA/HA nano-carrier takes polyethyleneimine as a body, LPEIS is synthesized through a polymerization reaction, and under the electrostatic interaction, the LPEIS is combined with negatively charged DNA and HA to form nanospheres; and the particle size of the LPEIS/pDNA/HA nano-carrier is 100 nm-400 nm. According to the method, the process is simple, and cost is low; the prepared product is good in stability, good in dispersity in warter and controllable in particle size; and the procedure that the nano-carrier enters the human body for gene therapy and antibody expression is simple, the preparation procedure is simple, the effects that the PEI/pDNA/HA nano-composite carries positive charges, is small in particle size and enters the human body easily are guaranteed, the nano-carrier can give expression to green fluorescent protein after entering a cell nucleus, an immune response of an organism is stimulated, and the treatment purpose is realized.

The invention discloses a grouting material for a prestress pore duct, belonging to the field of building materials. According to the grouting material, illegal cooking oil is subjected to hot-meltingstirring, centrifugation, alkalization, activated clay adsorption and the like so as to generate pretreated illegal cooking oil, the pretreated illegal cooking oil is matched with a swelling agent and the like, so that the effects of multiple active groups are enhanced; the groups can generate an anchoring effect to cement particles and can stretch in a liquid phase through hydrophily of side chains, so that a huge adsorption structure is formed on the surfaces of the particles, a steric hinerance effect is achieved, and the bleeding effect is reduced; and by virtue of the effects of humic acid components and superfine coal ash in a grouting material system, the contact angle can be reduced, and the fluidity of the grouting material is improved. According to the grouting material, the problems that the grouting material is poor in fluidity and easily bleeds at present are solved.

The invention discloses a TMC/genipin/pDNA nanometer carrier which is prepared from a TMC/genipin nanometer sphere for wrapping the pDNA. The particle diameter of the TMC/genipin/pDNA nanometer carrier is 100nm to 500nm. The preparation method comprises the steps: the monomer chitosan is synthesized into trimethyl chitosan, the nanometer sphere is formed through a cross-linking agent genipin, and then the DNA is carried into the nanometer sphere. The preparation method is simple in technology and low in cost; the prepared nanometer particles are good in stability, good in dispersion in water and controllable in particle diameter; the prepared pDNA nanometer carrier is smaller in effects on of the size and the electric charge quantity in PBS and oil phase; the prepared nanometer particles are better in matter stability than dual monomers, can change the charge distribution of the whole matter and are more suitable for gene therapy and antibody production.