36results about How to "Has a core-shell structure" patented technology

The invention provides a preparation method of an interpenetrating-network-structure water-based polyurethane nano composite material. The preparation method comprises the following steps: 1) carrying out vacuum dehydration treatment on polymer polylol and hydrophilic functional monomer; 2) adding a catalyst and diisocyanate, reacting at room temperature for 0.5-2 hours, heating to 60-80 DEG C, and carrying out the reaction for 1-5 hours while keeping the temperature; 3) cooling to 40-50 DEG C, adding a chain extender, and carrying out the reaction for 2-4 hours while keeping the temperature; 4) heating to 60-70 DEG C, and adding a reactive monomer for termination; 5) cooling to 30-50 DEG C, and adding a neutralizer to regulate the pH value; 6) heating to 60 DEG C, dropwise adding deionized water, and dispersing by stirring; and 7) heating to 60-65 DEG C, dropwise adding an initiator water solution and a nucleation monomer, carrying out programmed heating, and carrying out the reaction while keeping the temperature, thereby obtaining the interpenetrating-network-structure water-based polyurethane nano composite material. The method effectively solves the problem of VOC (volatile organic compound) discharge. The nano composite material has the characteristics in both the core-shell structure and the interpenetrating network structure, and thus, has favorable mechanical properties. The adopted continuous-process synthesis technique is beneficial to enhancing the production efficiency.

The invention relates to a preparation method and application of a zinc cobaltate/nickel oxide core-shell nanowire array. The method comprises the steps of mixing soluble cobalt salt, soluble zinc salt, ammonium fluoride, urea and water to obtain a uniform solution; after that, feeding the uniform solution into a reaction kettle, putting a clean substrate into the solution in the reaction kettle, and carrying out calcination to obtain the substrate on which a zinc cobaltate nanowire array grows; and mixing nickel sulfate, potassium peroxydisulfate and ammonia water, putting the substrate on which the zinc cobaltate nanowire array grows into the mixed liquid, and carrying out calcination to obtain the zinc cobaltate/nickel oxide core-shell nanowire array. The method is low in manufacturing cost, effective in implementation, feasible and applicable to industrialization; the zinc cobaltate/nickel oxide core-shell nanowire array obtained by the method has the advantages of being high in discharge capacity, rate capability, cycle performance, and the like when being used for preparing a negative electrode of a lithium ion battery.

The invention relates to a method of a lithium vanadium phosphate-coated ternary material of a lithium ion battery. The active electrode material of lithium vanadium phosphate is used as a coating material, and can form a uniform coating layer at the surface of the ternary material. A preparation method comprises the following steps of (1) preparing the ternary material; (2) mixing the ternary material and the lithium vanadium phosphate; (3) calcining a mixed sample under the reduction atmosphere. The method has the advantages that the transmission rate of lithium ions of the surface-coated lithium vanadium phosphate material is quick, and the large rate property of the material is improved; the lithium vanadium phosphate material has good stability, the erosion of electrolyte to the ternary material of an inner core is effectively inhibited, the coated ternary material integrates the advantages of the ternary material and the lithium vanadium phosphate, and the good rate property and cyclic property are realized.

The invention discloses a preparation method of modified magnetic composite nano particles and application thereof in pesticide detection. Magnetic composite Fe3O4@SiO2@Ag@COOH NPs are combined with an Au film to form an SERS substrate for effectively detecting trace thiaform bacteria. The Fe3O4@SiO2@Ag@COOH NPs have the same shape, good dispersibility and a core-shell structure, and can be quickly separated from the external magnetic field, so that thiabendazole is enriched. In addition, since LSPR of the Au film is coupled to the SPPs of the Ag particles, the SERS is further enhanced, the sensitivity of the detection is improved, and the rapid detection down to a concentration of 1[mu]g/L is realized.

The invention provides nanocomposite particles and a preparation method thereof. The preparation method of the nanocomposite particles comprises the following steps: dissolving ZrCl4 in N,N-dimethylmethylamide so as to form a ZrCl4 solution; sequentially adding terephthalic acid, benzoic acid, hydrochloric acid and meso-tetra(4-carboxyphenyl)porphine into the ZrCl4 solution so as to obtain organometallic framework nanoparticles embedded with porphyrin molecules; adding the organometallic framework nanoparticles into a buffer solution; and then, adding dopamine so as to form polydopamine by polymerization of dopamine molecules, thereby wrapping outer surface of the organometallic framework nanoparticles with the polydopamine so as to form nanocomposite particles with a core-shell structure,wherein thickness of the polydopamine layers is 5-50nm and size of the nanocomposite particles is 60-500nm. The nanocomposite particles prepared by the preparation method are uniform in appearance, good in dispersivity, low in biological toxicity, and excellent in photothermal effects and photodynamic therapeutic effects; and thus, the nanocomposite particles have good curative effects on tumors.

The invention discloses a preparation method of a core-shell type double-active acrylate elastic body. The preparation method is characterized by specifically comprising the following steps of: adding an acrylate monomer, acrylate containing active groups, and a compound emulsifying agent in a kneading machine, heating to 60-90 DEG C, keeping a temperature and reacting for 0.8-1.2 h, and then, adding a vulcanizing agent and an oxidation-reduction initiator, under the protection of nitrogen, heating to 80-100 DEG C, keeping the temperature and reacting for 1.5-2.0 h, and finally, cooling to 40-50 DEG C to obtain the core-shell type double-active acrylate elastic body. The core-shell type double-active acrylate elastic body is obtained through an emulsion polymerization method and has a core-shell structure; the combination property of an adhesive film is favorable; the core-shell type double-active acrylate elastic body is applied to a sealing fluorine rubber; and the sealing fluorine rubber can be enabled to have higher high temperature resistance, oil resistance, ageing resistance, low temperature resistance and tear resistance performances.

The invention belongs to the technical field of functional food processing, and discloses preparation of a protein-polysaccharide nano gel on the basis of Maillard reaction in a macromolecular crowding environment. The preparation method comprises the following steps: dissolving protein and polysaccharide in deionized water, stirring uniformly, regulating the pH value to 6.8-7, standing in a 4-DEG C refrigerator over night to perform hydration sufficiently, stirring at 60-95 DEG C to react for 6-48 hours, drying the reaction product to obtain powder, dissolving the powder in water to obtain a solution, regulating the pH value to the protein isoelectric point, carrying out heating treatment at 80-95 DEG C for 5-60 minutes, and cooling to obtain the protein-polysaccharide nano gel. The gel has the core-shell structure, has the advantages of small size and excellent stability, can be used for carrying biological active substances, and is hopeful to become the material for preparing new functional food.

The invention relates to aluminum oxide coated cubic boron nitride composite powder and a preparation method thereof. The preparation method comprises the following steps of: (1) mixing cubic boron nitride and ethanol according to a certain proportion, adding lauryl sodium sulfate and polyethylene glycol at a certain temperature under a stirring condition, uniformly mixing to obtain a solution, cooling the solution, centrifugally separating the solution, and washing to obtain modified nano c-BN; (2) mixing the modified nano c-BN with absolute ethyl alcohol according to a certain proportion under a stirring condition, uniformly dispersing to obtain a solution A, adding aluminum nitrate into the solution A, and uniformly mixing to obtain a solution B; and (3) slowly adding a mixed solution of ammonia water and ethanol into the solution B obtained in the step (2) until the pH value of the solution is 7-12, continuously stirring until the reaction is finished, standing and aging the obtained product, centrifugally separating the solid product, and heating and dehydrating to obtain the aluminum oxide coated cubic boron nitride composite powder. The preparation method disclosed by the invention has the characteristics of simple process and low cost, the prepared composite powder is good in dispersity, good in coating effect, high in coating rate and uniform in particle size, and thesurface characteristics of cubic boron nitride particles are improved.

The invention discloses a composite nanoparticle with calcium fluoride coated with aluminum oxide and a preparation method thereof. The preparation method comprises the following steps of (1) mixing polyvinylpyrrolidone and ethyl alcohol according to a certain ratio, stirring, adding xylene, uniformly mixing, and separating into two parts, namely a solution B and a solution C; (2) adding nanometercalcium fluoride powder into the solution B under the stirring condition, and uniformly dispersing, so as to obtain a solution B'; adding aluminum nitrate into the solution C, and uniformly mixing, so as to obtain a solution C'; (3) mixing the solution B' and the solution C', slowly adding an ammonium hydroxide and ethyl alcohol mixed solution until the pH (potential of hydrogen) value of the solution is 7 to 12, continuing to stir until reaction is finished, standing and aging the obtained product, centrifuging and separating a solid product, heating and dewatering, so as to obtain the composite nanoparticle with calcium fluoride coated with aluminum oxide. The preparation method has the characteristics that the technology is simple, and the cost is low. The prepared nanometer compositepowder has the advantages that the dispersivity is better, the coating effect is better, the coating rate is higher, the particle size is uniform, and the surface characteristic of the calcium fluoride particle is well improved.

The invention discloses a production process of a core/shell emulsion for environment-friendly wood coatings. A core/shell polymerization technology is adopted, so that the aims of reducing the film-forming temperature and reducing the amount of film-forming aids are achieved. A pre-emulsification process and a semi-continuous seeded emulsion polymerization mode are adopted, and acrylate emulsion with a core/shell structure and excellent performance is prepared and can be used for environment-friendly wood coatings.

The invention relates to the field of lithium ion batteries, and discloses an electrode material lithium supplement additive, a preparation method and application thereof, and a lithium ion battery, the electrode material lithium supplement additive comprises polymer lithium salt and a carbon film coating the surface of the polymer lithium salt. The preparation method of the electrode material lithium supplementing additive comprises the following steps: (1), mixing polymer lithium salt, a carbon source and a solvent; (2), carrying out solid-liquid separation on the material obtained by mixing in the step (1); and (3), carrying out heat treatment on the solid substance obtained by solid-liquid separation. The electrode material lithium supplement additive provided by the invention is convenient to store, has no special requirements on use conditions, and can improve the specific capacity of the material when being used in the electrode material.

The invention relates to a synthetic method and application of a 'BYC tracer agent'. A rare earth element tracer method is one of effective methods to detect oil reservoirs in oil fields. A fluorescent nanomaterial with a core-shell structure is synthesized and can be used as an oil field tracer agent which is named as the 'BYC tracer agent'. The tracer agent has the advantages that the water solubility is good, the use amount is small, the exploration demand quantity of water samples is few, the analytical method is simple and convenient, and the analysis sensitivity is high; the tracer agenthas no radioactivity, low toxicity and a minimal impact on the environment; the degree of mineralization is not affected, the compatibility with polymers is good, and oil displacing of the polymers is not affected; the application of the BYC tracer agent, that is, the fluorescent nanomaterial in the field of oil field exploration is creatively achieved, and a feasible operation scheme is proposed.

The invention relates to a synthetic method and application of a 'YYTC tracer agent'. A rare earth element tracer method is one of effective methods to detect oil reservoirs in oil fields. A fluorescent nanomaterial with good water solubility and a core-shell structure is synthesized and can be used as an oil field tracer agent which is named as the 'YYTC tracer agent'. The tracer agent has the advantages that the use amount is small, the exploration demand quantity of water samples is few, the analytical method is simple and convenient, and the analysis sensitivity is high; the tracer agent has no radioactivity, low toxicity and a minimal impact on the environment; the degree of mineralization is not affected, the compatibility with polymers is good, and oil displacing of the polymers isnot affected; the application of the BYC tracer agent, that is, the fluorescent nanomaterial in the field of oil field exploration is creatively achieved, and a feasible operation scheme is proposed.

The invention relates to the field of new materials, and in particular discloses a green synthesis method of epoxy modified starch-based emulsion. The method comprises the following steps: (1) firstly, heating starch or starch derivatives in presence of a catalyst to obtain a gelatinized liquid; (2) diluting and dispersing the epoxy resin and a polymerized monomer in a certain ratio without using an organic solvent so as to obtain a uniformly dispersed mixed liquid of the epoxy resin and the polymerized monomer; (3) dropwise adding part of the polymerized monomer and an initiator into the gelatinized liquid at a certain temperature at the same time to prepare a core layer polymer; (4) continuing to dropwise add a polymerized monomer containing the epoxy resin and the initiator to prepare a shell layer polymer; (5) carrying out a heat preservation reaction to obtain the epoxy modified starch-based emulsion. The emulsion is not only environmentally-friendly, but also has a core-shell structure, and is prepared without using an organic solvent and an emulsifying agent; not only is the emulsion environmentally-friendly, but all properties of the emulsion, especially the chemical resistance and water resistance, are also obviously improved, so that the emulsion can be widely applied to the fields of papermaking, textile and water-based paint.