44results about How to "Core-shell structure" patented technology

The invention provides a core-shell structured nano-silica/polyacrylate emulsion and simultaneously provides a method for preparing the emulsion by the adoption of an emulsion polymerisation method. The preparation method comprises the following steps of: firstly preparing monodispersed nano-silica by a sol-gel method, modifying the surface of the monodispersed nano-silica by the use of organosilicon silicyl oxide, dispersing the modified nano-silica into deionized water, using a seed emulsion with nano silica as the core structure and an acrylic acid ester mixed monomer to carry out polymerization encapsulation by an emulsion polymerisation method so as to form the core-shell structured nano-silica/polyacrylate emulsion. Micromorphology of emulsion particle is spherical and its structure is a core-shell structure, and nano-silica exists as the core structure.

The invention discloses anti-sticking soft dope printing adhesive and a preparation method. The adhesive comprises the following raw materials in percentage by mass: 25 to 50 percent of soft monomer, 6 to 20 percent of hard monomer, 0.8 to 5 percent of emulsifying agent, 0.1 to 0.25 percent of initiator, 0.05 to 0.5 percent of buffer, 0.04 to 0.2 percent of thiol and 40 to 65 percent of deionized water. The preparation method comprises the following steps: adding 1/8 to 1/6 of the soft monomer, the hard monomer and a functional monomer of the raw materials, total emulsifying agent and total deionized water into a reactor, stirring and emulsifying the mixture for 30 to 40 minutes at the room temperature, heating the mixture to between 50 and 65 DEG C, and adding the thiol and the initiator into the reactor; and beginning dripping the mixed monomer, preserving the heat for 2 hours at the temperature of between 50 and 65 DEG C after the dripping is finished, heating the mixture to 70 DEG C, preserving the heat for half an hour, and cooling a product to the room temperature, and discharging the product. The anti-sticking soft dope printing adhesive has the advantages that: the adhesive has excellent washing fastness, super-soft handfeel, environmental protection and no brittleness or after tack, overcomes the defects of hot sticking and poor handfeel of acrylic ester, has many available thickening agent categories, and easily mixes size.

The invention discloses a synthesis method of SrTiO3 heterogeneously coated BaTiO3 ultrafine nano-powder. According to the invention, BaTiO3 nano-particles are synthesized with a sol precipitation method; SrTiO3 is subjected to secondary nucleation with a hydrothermal method, such that a coating layer is formed; and the SrTiO3 heterogeneously coated BaTiO3 ultrafine nano-powder is synthesized. With the method provided by the invention, the synthesized nano-particles have small particle size, good dispersion and a significant core-shell structure. Also, because BaTiO3 and SrTiO3 have different interplanar spacings, the two are subjected to lattice distortion at contact interface layers, such that the dielectric constant and piezoelectric constant of BaTiO3 are improved. With the change of the doping amount of Sr, the interplanar spacings of heterojunction show a regular change.

The invention discloses a core-shell type acrylate emulsion and a preparation method thereof. The core-shell type acrylate emulsion is prepared by using methyl methacrylate (MMA) and ethyl acrylate (BA) as mixing monomers, modifying by using methylacryloyl oxygen propyl triethoxy silane (KH570) and by using a semi-continuous emulsion polymerization method. The prepared acrylic ester has better water resistence.

The invention relates to a preparation method of molybdenum oxide/ molybdenum disulfide core-shell microspheres, and belongs to the technical field of nanometer composite materials. The method comprises the following steps: (1) feeding a molybdenum source into a tubular furnace; oxidizing and roasting under high temperature in an air atmosphere to obtain molybdenum oxide particles; (2) adding ureaand a sulfur source into ethyl alcohol; stirring until the solution is clear; then adding the molybdenum oxide particles; ultrasonically and uniformly stirring; and transferring into a water heatingreaction chamber; and (3) centrifuging the reacted product; washing; and drying in vacuum to obtain the molybdenum oxide/ molybdenum disulfide core-shell microspheres. The method is simple in synthesizing line and easy to operate; additional sacrifice templates and catalysts are avoided; meanwhile, the prepared microspheres are regular in appearance, and uniform in size, and are independently scattered without agglomerating; and the microspheres can be widely applied to the fields of catalyzing, batteries, capacitors and lubrication.

The invention discloses a nanosilicon dioxide pellet. The nanosilicon dioxide pellet comprises a silicon dioxide shell body and a polymer nuclear body which is wrapped inside the silicon dioxide shell body. The grain size of the silicon dioxide shell body is 50-1000 nm and the shell thickness of the silicon dioxide shell body is 5-75 nm. The nanosilicon dioxide pellet has a uniform size distribution, a controllable pellet size, shell thickness and cavity rate and good biocompatibility; in addition, the nanosilicon dioxide pellet has good heat stability, a high mechanical property and very good water dispersibility. The invention also discloses a preparing method of the nanosilicon dioxide pellet. The preparing method is a soap-free emulsion polymerization method and is simple to operate; a nano composite pellet with a nuclear shell structure can be synthesized in a large scale, that is, the polymer nuclear body and the silicon dioxide shell body can be formed at the same time; meanwhile, the preparing process is simple and efficient, and the product yield and the product purity are high, and thus the cost is reduced sharply.

The invention relates to an acrylic emulsion with a self-crosslinked core-shell structure, and a preparation method of the acrylic emulsion. The preparation method comprises the following steps: compounding acrylic hard monomers and acrylic soft monomers, adding functional monomers such as vinylidene, phosphate monomers and organic fluorine active monomers, adding self-crosslinked monomers to obtain the acrylic emulsion with the self-crosslinked core-shell structure by using an emulsion polymerization method under the special emulsifier combination. Through core-shell interpenetration technology and special raw material matching, the emulsion has good water resistance and corrosion resistance performances, is high in adhesion force, has excellent comprehensive performance, and can be directly coated into maintenance engineering of various steel structure members and mechanical equipment, and the like, thus having wide application prospects.

The invention discloses a microfluidic spinning device, a linear core-shell structure conductive fiber and a preparation method and application of the linear core-shell structure conductive fiber. Thepreparation method is based on a co-flow microfluidic spinning device, a shell layer solution and a core layer solution are correspondingly guided into an inner-phase capillary tube and an intermediate-phase capillary tube, a core-shell structure fiber precursor in a laminar flow state is obtained, and then the fiber precursor is rapidly cured by using an external-phase curing solution, so that the core-shell structure of the fiber is smoothly maintained; the wall thickness of the fiber is precisely adjusted by adjusting the flow velocity of each phase of the fiber, so that the morphology ofthe conductive fiber is regulated, and the preparation process is simple, low in cost and suitable for large-scale production; and according to the linear core-shell structure conductive fiber, an MXene aqueous solution is used as a core layer, a shrinkable alginate hydrogel material with good biocompatibility is used as a sheath layer, and the fiber has excellent conductive performance and photo-thermal shrinkage performance while a good core-shell structure is ensured, so that the linear core-shell structure conductive fiber is applied to a flexible electronic device which responds to external photo-thermal stimulation.

The invention provides a preparation method of pH sensitive multistage polymer composite nanospheres and belongs to the technical field of functional polymer materials. The preparation method comprises the steps of adding 4-vinylpyridine to an HCl aqueous solution at 75 DEG C and then adding deionized water, keeping a temperature constant for 10min so that the 4-vinylpyridine is dissolved, removing oxygen by blowing nitrogen, next, adding styrene, stirring, and increasing the temperature to 75 DEG C to obtain a mixed solution A, next, dissolving potassium peroxodisulfate in deionized water, ultrasonically shaking, and after the temperature of the reaction system is constant at 75 DEG C, adding the mixed solution A for continuous reaction to obtain core-shell structured polymer nanospheres, dissolving the emulsion of the polymer nanospheres in HCl solutions different in pH value, and stirring to obtain the pH sensitive multistage polymer composite nanospheres. The preparation method is simple and does not need auxiliaries such as an emulsifier and a surfactant, and the obtained nanospheres are even in particle size and have obvious core-shell structure. When the change of pH is capable of resulting in assembling and disassembling, the pH sensitive multistage polymer composite nanospheres have extremely high application value.

The invention relates to a magnetic core-shell mesoporous surface molecularly imprinted composite nano material and a preparation method thereof, and belongs to the technical field of molecularly imprinted polymers. The material is black powder, the average particle size of powder particles is 200-300 nm, the specific surface area is 327.6 cm<2>/g, and the saturation magnetization is 54.9 emu/g. The preparation method comprises the following steps: synthesizing double-layer silicon dioxide coated magnetic core-shell mesoporous nano composite particles as a carrier through an improved Stober method, bonding amino groups on the carrier, taking diisononyl phthalate as a virtual template, and preparing a novel magnetic core-shell mesoporous surface molecularly imprinted composite nano material through a surface molecular imprinting technology; a matrix dispersion-magnetic solid phase extraction-gas chromatography-mass spectrometry method established on the basis that the material disclosed by the invention is a magnetic solid phase extraction agent is used for detecting phthalic acid ester substances, and the method is low in detection limit, high in precision and suitable for detecting trace phthalic acid ester in liquid drinks such as water, wine and drinks.

The invention discloses a phospholipid hybrid polymer micelle capable of being co-loaded with immunologic adjuvant and indocyanine green and having a targeting effect, and a preparation method and application of the phospholipid hybrid polymer micelle. The method comprises the following steps of: dissolving PCL-s-PEG-s-PCL, hydrophobic ICG, DSPE-PEG-COOH, MnO2, NLG919 and a TLR4 agonist in an organic solvent, performing ultrasonic treatment, removing an organic solvent, and forming a layer of uniform thin film; drying the thin film, and carrying out hydration, ultrasonic treatment and dialysis in sequence to obtain a nanoparticle micelle solution; and activating carboxyl groups on the surfaces of the nanoparticle micelles in the nanoparticle micelle solution, adding NH2-RGD into the nanoparticle micelle solution for incubation, and dialyzing to obtain the phospholipid hybrid polymer micelle capable of being co-loaded with the immunologic adjuvants (NLG919 and MPLA) and the indocyanine green and having the targeting effect. According to the method, hydrophobic drugs (ICG and NLG919) are effectively wrapped in an inner cavity, an immune agonist is embedded into a phospholipid layer, and aminated polypeptide arginine-glycine-aspartic acid is modified on the surface of a carrier, and therefore, the nano-drug carrier effectively aiming at phototherapy and immunotherapy of malignant tumors is formed.

The invention relates to the technical field of environment-friendly catalysts, in particular to flower-cluster-shaped Fe3O4@MnO2 as well as a preparation method and application thereof. According tothe method, ferroferric oxide is used as a precursor and potassium permanganate and absolute ethyl alcohol are used as raw materials, so that flower-cluster-shaped Fe3O4@MnO2 is directly synthesized through a hydrothermal method. According to the preparation method, the absolute ethyl alcohol, which is used as a carbon source, and potassium permanganate are subjected to a redox reaction to generate manganese dioxide, and meanwhile hierarchical manganese dioxide nanosheets are generated, wherein the product has complete appearance and uniform size; the surface of the ferroferric oxide core doesnot need to be coated with a carbon layer in advance, a product with an obvious core-shell structure is synthesized, and the synthesis process is effectively simplified.

The invention discloses a core-shell structure high-thermal-conductivity wear-resistant composite valve guide pipe and a manufacturing process thereof, and relates to the technical field of powder metallurgy of automobile parts. A core is made of an iron-based alloy powder metallurgy material with better wear resistance, an inner hole contains lubricating oil, and the core shows excellent wear-resistant and self-lubricating properties when being in contact with a valve, a shell is made of high-heat-conduction red copper, heat of the core is efficiently conducted to a cylinder cover for heat dissipation, the actual working temperature of the core is reduced, the abrasion environment is optimized, meanwhile, the good ductility of the red copper is more beneficial to pressing a valve guide pipe into the cylinder cover, the cost advantage is obvious, and the requirement for improving the performance of an engine can be met.

The invention relates to a submicron nucleocapsid microsphere material capable of releasing active factors on time and a preparation method of the submicron nucleocapsid microsphere material, and solves the technical problems that a conventional size effect can hardly meet clinical conversion applications based on a bone defect repair with a support material, and the ideal time-sequence cooperation of bone-formation and vessel-formation still cannot be acquired. The submicron nucleocapsid microsphere material is provided with a nuclear layer and a shell layer, wherein the nuclear layer is made of poly-dl-lactic acid, and morphogenetic protein are carried on the poly-dl-lactic acid; the shell layer is made of polylactide-glycolide, and vascular endothelial growth factors are carried on the polylactide-glycolide; the diameter mu of the microsphere material ranges from 0.4 [mu]m to 1.6 [mu]m. The invention provides the preparation method of the submicron nucleocapsid microsphere material capable of releasing the active factors on time, and can be widely used for the preparation field of the repair materials for bone defect and bone deficiency.