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

The invention relates to a method for massively preparing a platinum-based dealloyed electrocatalyst for a cathode of a fuel cell, and belongs to the technical field of electrochemistry and new energy. According to the method, dealloying treatment is carried out by acid vapor; direct contact of a catalyst solid and an acid liquid is avoided; and solid-liquid separation operation is omitted. The dealloyed electrocatalyst prepared by the method has a core-shell structure, improves the utilization rate and the specific activity of noble metal platinum are improved and improves the stability. The preparation method reduces the acid consumption and washing water, and reduces platinum loss in the dealloying process. In addition, use of stirring equipment is also avoided in the preparation process; and the energy consumption is reduced. The preparation method provided by the invention is suitable for massive production of the low-platinum electrocatalyst; the problem of massive preparation of the low-platinum electrocatalyst can be effectively solved; and application of the low-platinum electrocatalyst in the fuel cell is promoted, so that the commercialization process of the fuel cell is promoted.

The invention discloses a lithium ion battery silicon / carbon negative electrode composite material. The lithium ion battery silicon / carbon negative electrode composite material is of a core shell structure, wherein a core is porous-structure silicon particle, a shell layer is a zigzagging carbon nanotube cluster having a large amount of gaps, and interfaces of the core and the shell layer are connected by a metal silicide. In the lithium ion battery silicon / carbon negative electrode composite material, the volume expansion of silicon during the charge-discharge process is remarkably reduced byporosity of the silicon particle, and the diffusion performance of lithium ions in the silicon is improved; with high conductivity of the carbon nanotube cluster, the defect of low conductivity of the silicon is overcome, meanwhile, the carbon nanotube cluster is used as a flexible external buffer layer, the volume expansion of the silicon is further reduced; and the metal silicide is used as a compact connection point, an electron transmission passage is built between the silicon and the carbon nanotube, and the carbon nanotube can be prevented from falling off during the charge-discharge process. The novel-structure silicon / carbon negative electrode composite material provided by the invention has the advantages of high specific capacity, good cycle property, excellent rate performanceand the like in application of a lithium ion battery and is low in fabrication cost and simple in method, and industrial production is easily achieved.

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 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 relates to a synthetic method and application of a BEFC tracer. Rare-earth element tracing method is one of effective measures to detect oil reservoirs in oilfields. A NaBiF4:Eu3+@C4H4Na2O6 fluorescent nano material with core-shell structure is synthesized herein and may act as an oilfield tracer, named as BEFC tracer. The tracer herein has the advantages of good water solubility, low usage, low water sample demand, good analytical simplicity, high analytical sensitivity, zero radiation, low toxicity, every low environmental impact, zero impact on mineralization degree, good compatibility with polymers, and zero impact on polymer flooding. The application of the BEFC tracer as one fluorescent nano material in the field of oilfield detection is innovatively achieved herein; afeasible operating scheme is provided as well.

The invention relates to a magnetic silicon dioxide compound microballoon of a core-shell structure and a preparation method thereof. The compound microballoon takes a metallic ion complexing polymer microballoon as a core, and then ortho-silicate alkyl ester is taken as a precursor, and the silicon dioxide compound microballoon with the core-shell structure is prepared by adopting a gel-sol method, and the magnetic silicon dioxide compound microballoon is obtained by pyrolyzing the compound microballoon; wherein, the core is a metallic nano-particle / carbon compound microballoon, and the shell is the silicon dioxide. The method is simple and effective, and the preparation is convenient; therefore, the method is a novel method for preparing the magnetic silicon dioxide compound microballoon of the core-shell structure.

The invention relates to a synthetic method and application method of a BYP tracer. Rare-earth element tracing method is one of effective measures to detect oil reservoirs in oilfields. A fluorescentnano material with good water solubility and core-shell structure is synthesized herein and may act as an oilfield tracer, named as BYP tracer. The tracer herein has the advantages of low usage, low water sample demand, good analytical simplicity, high analytical sensitivity, zero radiation, low toxicity, every low environmental impact, zero impact on mineralization degree, good compatibility withpolymers, and zero impact on polymer flooding. The application of the BYP tracer as one nano material in the field of oilfield detection is innovatively achieved herein; a feasible operating scheme is provided as well.

The invention relates to a core-shell particle having a main core body of acrylic acid ester polyurethane, the process for preparation and use, wherein the core-shell particle uses the copolymer of acrylated polyurethane monomer and acrylic ester category soft monomers as the core, and uses the outer grafted upper acrylic ester type hard monomers as shell, while the preparation process comprises the steps of, (1) preparing acrylated polyurethane, (2) re-emulsifying to obtain water-based acrylated polyurethane emulsion, (3)A. charging acrylic ester type soft monomer into the emulsion to obtain seed emulsion, B. charging acrylic ester type hard monomer into the emulsion to obtain core-shell emulsion, (4) demulsifying with sodium chloride saturated solution, freezing, filtering by suction, scouring, drying, grinding thus obtaining the core-shell particle with a main core body of acrylic acid ester polyurethane.