13 results about "Core shell" patented technology

The invention discloses a preparation method for a co-doped type and separately-coded type ZnInS/ZnS dual-emitter quantum dot. The preparation method comprises preparation of white-light emitting ZnInS:Ag/ZnS/ZnS:Mn/ZnS and ZnInS:Ag & Mn/ZnS/ZnS/ZnS nano materials, wherein by adopting a core-shell structure, the ZnInS:Ag/ZnS/ZnS:Mn/Zn nano material is synthesized by the following steps of: (1) preparing a color-adjustable ZnInS: Ag core; (2) carrying out core-covering on a first molar layer ZnS; and (3) adsorbing Mn ions and carrying out cover-covering on second and third molar layers; and for the preparation of the ZnInS:Ag & Mn/ZnS/ZnS/ZnS nano material, injecting time of a Mn precursor in the step (3) is advanced to injecting time of an S precursor in the step (1). The preparation method adopts a single-pot thermal injection process, is simple in process, easy to operate, capable of being completed in common chemical laboratories, and easy to popularize; and raw materials are convenient to supply, and are low in price.

The invention relates to a multi-purpose strippable acrylate adhesive microporous material and a preparation method of the material, in particular to an acrylate adhesive material and a preparation method of the material, and solves the problems of low shearing strength and stripping resistance of the existing acrylate adhesives. The adhesive microporous material is prepared from acrylate resin, foaming agent, foam stabilizer, thickener, plasticizer, cross-linking agent, isopropanol and filler. The preparation method comprises the following steps: (1) preparing raw materials of acrylate resin according to weight ratio; (2) adding each raw material component prepared in the step (1) in a reaction kettle under controlled dropping speed, and performing core-shell emulsion polymerization to obtain acrylate resin; and (3) sequentially adding acrylate resin and the rest of raw materials prepared in the step (2) in the reaction kettle, dispersing, drying, and transferring onto a substrate to obtain acrylate adhesive. The acrylate adhesive microporous material has the advantages of high shearing strength, and easy stripping, and is mainly applied to poster, wall sticker and adhesive on various decorative stickers.

The invention belongs to the field of agricultural films, and discloses a weeding mulching film and a preparation method and application thereof. The weeding mulching film comprises the following components in percentage by mass: 3-30% of herbicide masterbatch and 70-97% of PE (polyethylene) resin A; the herbicide masterbatch comprises the following components in percentage by mass: 25-75 %of PE resin B, 10-60% of herbicide and 2-15% of modifier. In the invention, the modifier is used for pretreating the herbicide; during processing, the modifier is molten and then covers the surface of the herbicide to form a herbicide core; the core shell structure taking the modifier as a shell can effectively protect the herbicide to reduce the loss of the herbicide caused by thermolysis at high temperature in a preparation process of the weeding masterbatch and mulching film. In the weeding mulching film provided by the invention, the herbicide masterbatch is uniformly dispersed, the release rate of the herbicide is reduced, and the efficacy time can be prolonged; after covering with the mulching film for 60 days, the weeding effect still can exceed 90%.

The invention relates to the field of organic high-molecular compounds. In order to solve the problem of deficiency in long residual action and environment friendliness in the existing oil-based fluorine-containing low-surface-energy anti-doodling paint, the invention provides a water-based anti-doodling paint and a preparation method thereof. The preparation method comprises the following steps: adding a pigment, a filler and a dispersing agent into a toning cylinder, mixing, adding into a grinder, and grinding until the fineness is less than 20 mu m to obtain a color paste; and adding deionized water, the color paste, a fluorine-silicon-modified polyurethane core-shell emulsion, a preservative and a mildew preventive into a dispersion cylinder, mixing, sequentially adding a film forming assistant, a defoaming agent a thickener, mixing, and discharging to obtain the water-based anti-doodling paint. The film formed by the paint has the characteristics of excellent weather resistance, excellent ultraviolet resistance, excellent wear resistance, low surface energy, excellent pollution resistance, excellent doodling resistance, low VOC (volatile organic compound) emission, environment friendliness and no toxicity.

The invention provides a preparation method for MnO2@SiO2 nano composite particles with core-shell structures. The method comprises the steps of A) mixing potassium permanganate and a silica precursorto obtain a mixed solution; B) irradiating the mixed solution with a cobalt 60 source under a stirring condition to initiate reactions to obtain a mixed solution after irradiation; C) centrifuging the irradiated mixed solution, and separating to obtain the MnO2@SiO2 nano composite particles with the core-shell structures. The method directly irradiates the potassium permanganate solution containing the silica precursor by 60Co gamma-ray, and obtains the MnO2@SiO2 composite nano particles with particle diameters of 100 nanometre or less which take MnO2 as cores and SiO2 as shells by a one-stepmethod. The method has the advantages of simple formula, convenient operation, economic performance, energy saving, green and environmental protection.

The invention relates to the field of biological detection and the field of nanomaterial functional application, and discloses a method for preparing a core-shell SERS structure based on the amplification of a nucleic acid strand by terminal deoxynucleotidyl transferases. The method comprises the following steps of: assembling a starting strand on the surface of a nanomaterial, carrying out the DNA amplification reaction on the surface of the terminal deoxynucleotidyl transferase, transferring deoxynucleotide to the starting primer strand assembled on the surface of the nanomaterial so as to form long single-stranded DNA on the surface of the nanomaterial and then obtain a nanomaterial-long-single-stranded-DNA complex; and covering a metal shell layer outside the nanomaterial-long-single-stranded-DNA complex by the chemical reduction method so as to form the core-shell structure. The core-shell SERS structure has long strand DNA which can be used as a Raman reporter small molecule so as to output efficient and uniform SERS signals to enhance the intensity of Raman signals. Bases are located between the core and the shell, so that the number of ''hot spots'' in the core-shell structure is increased, the adsorption of target molecules or antibodies on the surface of the core-shell structure is affected, the sensitivity of the detection can be greatly improved, and the method canbe applied to the field of biological analysis and detection.

The invention provides straw-based composite filler. The straw-based composite filler is a compound with a core-shell structure, wherein straw powder particles are used as a core of the compound with the core-shell structure; a cladding film which is grafted with the straw powder particles and contains an acrylamide copolymer is used a shell layer of the compound with the core-shell structure; the straw powder particles are particles which are obtained by crushing straw powder to 30 meshes to 200 meshes; the cladding film shell layer containing the acrylamide copolymer is formed by copolymerizing monomers (a), (b) and (c). The novel straw-based composite filler provided by the invention has the core-shell structure; a surface polymer film of the shell layer has a function of not desorbing and also has hydrophily and cationic property; when the straw-based composite filler is used for paper filling, the net retention rate is kept, even improved, and the effects of enhancing and toughening can be realized. Therefore, properties of the straw-based composite filler can be sufficiently utilized and the straw-based composite filler is used as special filler of the paper.

The invention relates to an efficient photoelectric converter based on a carbon fiber@ tungsten disulfide nanosheet core-shell composite structure and a preparation method of the efficient photoelectric converter, and belongs to the technical field of novel materials and application thereof. The efficient photoelectric converter provided by the invention adopts the carbon fiber@ tungsten disulfide nanosheet core-shell composite structure as a photoelectric conversion material; furthermore, ohmic electrodes are arranged at two ends of each carbon fiber with the carbon fiber@ tungsten disulfide nanosheet core-shell composite structure, and the carbon fiber is connected in parallel to a solar receiving device and then is connected in series with a low-voltage power supply and an electrical appliance for combination, so that the photoelectric converter is obtained. The photoelectric converter disclosed by the invention is simple in structure; preparation equipment and a process for the device are simple; the prepared device is stable in structure and performance; the product yield is high, the cost is low, and the production process is clean and environment-friendly. The photoelectric converter prepared by the preparation method is high in photoelectric conversion efficiency and can be used as a solar power generation device and a light signal sensitive detector.

The invention provides a clopidol controlled-release microparticle preparation and a preparation method thereof. The clopidol controlled-release microparticle preparation has a core-shell structure, a mineral carrier which adsorbs clopidol forms a system inner core, and calcium alginate gel forms a system outer shell. The clopidol controlled-release microparticle preparation can effectively avoid burst release of drug in stomach, so that irritation to the stomach by the drug is reduced, and adverse reaction of a gastrointestinal tract is reduced. Granularity of the preparation is 50-900 micrometers, so that the preparation is convenient for being uniformly mixed with feed and conducive to livestock and poultry absorption, and bioavailability of the drug is improved. The preparation method is simple, and the preparation is free of dust pollution and suitable for industrialized production.