49 results about "Core shell nanocomposites" patented technology

The invention relates to a coating, which comprises the following components: surface-modified titanium dioxide and silicon dioxide core-shell nanocomposite particles and a film forming component, wherein a weight ratio of the surface-modified titanium dioxide and silicon dioxide core-shell nanocomposite particles to the film forming component is 1:(9-99); the surface-modified titanium dioxide and silicon dioxide core-shell nanocomposite particles consist of titanium dioxide and silicon dioxide core-shell nanocomposite particles serving as a matrix and a dispersing agent coated thereon, wherein the content of the dispersing agent is 0.1 to 1.5 percent based on the weight of the titanium dioxide and silicon dioxide core-shell nanocomposite particles; and the titanium dioxide and silicon dioxide core-shell nanocomposite particles consist of titanium dioxide nanoparticles serving as cores and silicon dioxide serving as shells, wherein a molar ratio of the titanium dioxide and the silicon dioxide is 1:(1-8), and the titanium dioxide and silicon dioxide core-shell nanocomposite particles have the grain size of 10-60nm. The invention also relates to a method for preparing the coating.

The invention discloses a method for preparing an enzyme electrode with an MWCNTs-TiO2/Nafion composite medium. In the method, MWCNTs-TiO2 core-shell nanocomposite materials are scattered into Nafion to prepare an organic-inorganic composite membrane as a fixed matrix for biological molecules for structuring a hemoglobin electrode, and a hemoglobin biosensor with fast response, high sensitivity and strong catalytic capacity is prepared by using the properties of large specific surface area, high surface reactivity, strong adsorption capacity, large electrical conductivity and the like of the MWCNTs-TiO2 core-shell nanocomposite materials and the properties of membrane forming, high chemical stability, high anti-interference capacity and the like of the Nafion. The biosensor has good biocompatibility, stability and repeatability, and has potential application in structuring biosensors. The sensor can be used for detecting the substances of hydrogen peroxide, trichloroacetic acid and the like, and has the advantages of low sensitivity, low detection limit and the like.

The invention relates to a magnetic core-shell nanometer composite material with nickel particles and a preparation method and application of the magnetic core-shell nanometer composite material. The composite material comprises magnetic cores and carbonized shells, wherein the magnetic cores are coated with the carbonized shells with the nickel particles. The portion between each magnetic core and the corresponding carbonized shell is coated with a silica inner shell. The preparation method of the composite material comprises the following steps that firstly, the magnetic cores coated with silica layers are dispersed in an alkaline alcohol-water system, then added into a precursor solution of synthetic phenolic resin mixed with nickel salt, and the magnetic cores coated with phenolic resin layers are obtained after reaction, wherein the phenolic resin layers are doped with nickel ions; secondly, the magnetic cores coated with the phenolic resin layers are subjected to heat preservation and calcination in an inert environment, and the magnetic core-shell nanometer composite material with the nickel particles is obtained. The composite material has the advantages of being high in magnetism, good and stable in morphology and structure, good in adsorption and catalytic functions and the like, and the composite material is especially used in a catalytic reduction reaction of an aromatic nitro compound.

A nanocomposite optical plastic article has a plastic host material with a temperature sensitive optical vector (x) and a core shell nanoparticulate material dispersed into the plastic host material. The core shell nanoparticulate material is characterized by a core defined by a nanoparticulate material which has a temperature sensitive optical vector (x₁) and a shell defined by a coating material layer coated onto the core. It is important to the invention that temperature sensitive vector (x₁) is directionally opposed to the temperature sensitive optical vector (x) and n_shell<n_{plastic host}<n_core.

The invention relates to a hollow spherical CeO2@C core-shell nano composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing a CeO2 hollow sphere through a solvothermal method; then covering the surface of CeO2 with one layer of RF (Resorcinol-formaldehyde); calcining in an inert atmosphere to obtain the hollow spherical CeO2@C core-shell nano composite material. According to the hollow spherical CeO2@C core-shell nano composite material, the amount of resorcinol and formaldehyde is changed so that the thickness of a C layer of a shell can be adjusted. In the process, the preparation method is simple and a preparation process is safe, green and environmentally friendly, and has low energy consumptionand strong operability. The CeO2 prepared by the preparation method has a rough surface and has a macroporous structure; the specific surface area can be enlarged and the contact area between the CeO2 and the C layer is enlarged; the dispersion of ions and electrons is also can be promoted and the electrochemical performance is effectively improved.

The invention provides a polytetrafluoroethylene-based core-shell nano composite material as well as a preparation method and application thereof, and belongs to the technical field of polymer composite materials. According to the polytetrafluoroethylene-based core-shell nano composite material provided by the invention, polytetrafluoroethylene latex particles are used as a core, a polymer layer obtained by polymerization reaction of a first monomer, a second monomer, a first initiator, a second initiator and water is used as a first shell layer, and a silicon dioxide layer obtained by hydrolysis condensation reaction of the polymer layer, ethanol, water, ammonia water and a silicon source reagent is used as a second shell layer. The polytetrafluoroethylene-based core-shell nano compositematerial provided by the invention has excellent self-lubricating property, high chemical activity and high wear resistance under the condition that a C-F molecular chain skeleton is not damaged.

A method for preparing nanometer precious metal shell and magnetic core composite particle through self-assembling comprises the following steps: mixing a magnetic core with a Au nanoparticle or a Ag nanoparticle according to a mass ratio of 1:(20-200), adding an auric chloride acid solution when the Au nanoparticle is mixed or adding a silver nitrate solution when the Ag nanoparticle is mixed in order to obtain a mixed solution, adding sodium citrate to the mixed solution, and reacting the above obtained mixture in an air oscillator to obtain the Fe3O4/precious metal core-shell nanocomposite particle. The Fe3O4/polymer/precious metal magnetic composite material is obtained through carrying out polymer cladding of the surface of the magnetic nanoparticle, assembling the precious metal nanoparticle and forming a continuous precious metal shell through in situ reduction, and the magnetic composite material has the characteristics of good biocompatibility, uniform particle size, nanometer optical effects, large specific surface area, unique optical characteristics, superparamagnetism, and good magnetic responsibility under applied magnetic field.

The invention discloses a three-dimensional In2O3/SnO2 core-shell nanocomposite for detecting formaldehyde gas and a gas sensor prepared therefrom, a three-dimensionally-classed core-shell heterojunction structure is obtained by taking In2O3 nanofiber as a skeleton and uniformly growing a uniform SnO2 nanosheet array on the fiber surface by a hydrothermal method; the obtained three-dimensional In2O3/SnO2 core-shell nanocomposite is mixed with ethanol and stirred into a paste, and is uniformly applied to the surface of an alumina ceramic tube with gold electrodes at both ends, welding, aging and encapsulation are performed according to a heater-type semiconductor gas sensor, a formaldehyde gas sensor is prepared, the formaldehyde gas sensor has high sensitivity to the formaldehyde gas, goodselectivity to an interference gas, good stability, and low working temperature, and can be used for indoor detection of the formaldehyde gas in the living environment, and the concentration of the detected formaldehyde gas is 0.1 to 500 ppm.

The invention relates to preparation of a high-performance ZnS @ SiO2/C composite cathode material and a lithium/sodium storage application of the material. For the problem of poor cycle performance of sulfide (such as ZnS) due to volume expansion and dissolution/diffusion loss during lithium/sodium storage, a core-shell ZnS @ SiO2/C nanocomposite is realized through simple liquid phase reaction and vapor deposition by using zinc salt, ethanol, waste glass and other raw materials. Compared with ZnS cathode, the main advantages of the composite cathode material are that: the outer layer of SiO2/C has stable structure and strong strain resistance, low quality proportion, thin thickness and low ion/electron transmission impedance; the preparation raw materials are cheap and easily-available,and the production process is simple; ZnS @ SiO2/C shows excellent electrochemical performance when the ZnS @ SiO2/C is used as the lithium/sodium ion battery cathode. The preparation method of the material is novel, effective and ingenious, can fully realize the recycle of glass resources, and provides an effective basis for the development of the high-performance sulfide cathode.

The invention discloses a polyethyleneimine modified porous silicon dioxide-coating LDH core-shell nano composite material and a preparation method thereof, and relates to a core-shell structure nanocomposite material and a preparation method thereof. The problems that plasmid DNA combined by an existing LDH-coated SiO2 shell-core nano composite material is easily degraded by nuclease, and the biological stability is poor are solved. The method comprises the following steps: 1, preparing aminated porous silicon dioxide; 2, preparing carboxylated porous silicon dioxide; 3, preparing polyethyleneimine modified porous silicon dioxide; and 4, preparing the polyethyleneimine modified porous silicon dioxide-coating LDH core-shell nano composite material. According to the core-shell nano composite material prepared by the method, plasmid DNA cannot be recognized by protease and nuclease and cannot be degraded, and the core-shell nano composite material has very high biological stability. Theinvention is applied to the field of gene delivery vector materials.

The invention discloses a new method for the preparation of Ni-Co-S @ Co _ 3O _ 4-Delta nanocomposites with double shell oxygen vacancies , Thetheoretical high-capacity Co3O4 is one of the most promising cathode materials for supercapacitors. Firstly, carbon paper is used as a carrier, and Ni-Co-S@Co3O4 core-shell nanocomposites are synthesized by ion exchange method and low temperature heat treatment. Ni-Co-S-Co3O4-Theta nanocomposites with double-shell oxygen vacancies were obtained by universal reduction method, which greatly improved the conductivity and ion diffusion capacity of the electrode, and provided a new high-performance Co3O4 based electrode material design.

The present disclosure provides a core-shell nanocomposite material comprising an intrinsically conductive polymer (ICP) polymerized on the surface of oxidized cellulose nanocrystals (CNCs) as well as synthesis for preparing same and its use thereof in various applications.

The invention provides a catalyst for synthesizing salicylic acid through phenol carboxylation reaction and a preparation method. The catalyst is a novel recyclable MOFs immobilized ionic liquid catalyst. The catalytic active component is Lewis acidic ionic liquid, and the carrier is a magnetic core-shell MOFs nano composite material Fe3O4@ZIFs. The method comprises the following steps of: firstly, epitaxially growing a magnetic core-shell composite material carrier (Fe3O4@ZIFs) of a ZIFs shell layer on magnetic Fe3O4 nanoparticles by adopting a one-pot method, then synthesizing an ionic liquid catalyst with a Lewis acid active site by a two-step method, and immobilizing the ionic liquid catalyst with the Lewis acid active site on the surface of Fe3O4@ZIFs by an impregnation method. The catalyst has good catalytic performance on the reaction of preparing salicylic acid through phenol carboxylation, is high in recoverability by means of an external magnetic field effect, still keeps high catalytic activity after being recycled, the product selectivity is high, and the technological process is green and environment-friendly, therefore the catalyst is a novel green chemical catalyticmaterial with industrial application prospects.

A ZnO@C C negative electrode material for a zinc-nickel battery and a preparation method thereof belongs to the field of alkaline secondary battery negative electrode materials. The preparation method of the ZnO@C negative electrode material for the zinc-nickel battery comprises the following steps of: preparing nano ZnO microspheres by adopting a hydrothermal method, taking the nano ZnO microspheres as a zinc source, growing ZIF-8 on the surfaces of the nano ZnO microspheres in situ to prepare a ZnO@ZIF-8 core-shell nano composite material with a ZIF-8 coated core-shell structure, and performing argon carbonization and air carbonization to form a ZIF-8 derived carbon coated ZnO nano composite material (ZnO@C). When the material is used for a zinc-nickel battery negative electrode, the core-shell structure can increase the contact area between an active substance and an electrolyte and improve the conductivity of an electrode material, the porous carbon coating the surface of ZnO can inhibit dissolution of ZnO in alkaline electrolyte, more zinc deposition sites are provided, dendritic crystals and deformation of a zinc negative electrode are effectively slowed down, and the cycle performance of the zinc-nickel battery is excellent.

The invention discloses a core/shell structure Ti3C2 ene/Cu powder and a preparation method thereof. By using the chemical plating technology, Ti3C2 ene is used as a carrier, and the surface of the Ti3C2 ene is wrapped by one layer of shell film composed of copper particles. A plating solution is mainly composed of copper sulfate pentahydrate, ethylenediamine tetraacetic acid disodium and 2,2'-bipyridine, a reducing agent is hydrazine hydrate, the reaction temperature is 45-95 DEG C, and pH is controlled at 9-13. The process is simple, cost is low, the core/shell structure Ti3C2/Cu powder canbe stably acquired within short time, it is not needed to perform roughening, sensitization, activation and other pre-treatment on a substrate, the thickness of a plated film and the particle size canboth be adjustable, and thus, a core/shell nanocomposite in different properties can be prepared. The core/shell powder has broad application prospects in the aspects of catalysis, optics, electromagnetics and the like. The method is also applicable to MXene/metal powder in other core/shell structures, and (MXene comprises M2Xene, M3X2ene, M4X3ene and the like; and shell layer metal comprises Cu,Ni, Sn, Co and the like).

The invention discloses a gold/quaternary carbon dot core-shell nanocomposite and a preparation method. Gold nanoparticles serve as the core of the composite, and quaternary carbon dots serve as the shell of the composite. The method includes the steps that betaine hydrochloride is dissolved in deionized water, tris(hydroxymethyl)methyl aminomethane is added, isopropanol is added after dissolution, and obtained paste is subjected to vacuum drying; the paste is heated with a muffle furnace after being dried, a brown solid is obtained and added into deionized water, formed brown dispersion liquid is precipitated with acetone, indoor-temperature drying is carried out, and quaternary carbon dots are obtained; sesbania gum is added into deionized water, centrifugal separation is carried out, the supernatant liquor part is taken, a chloroauric acid solution is added, magnetic stirring is carried out, and gold nanosol is obtained; quaternary carbon dots are dissolved in deionized water, gold nanosol is added, ultrasonic dispersion is carried out in a probe ultrasonic crusher, and the composite is obtained. The composite has the infrared absorption function, stable fluorescence, particle-size monodispersity, hypotoxicity and good biocompatibility, achieves treatment and real-time form monitoring of cancer cells in the organism and has application prospects in the tumor treatment field.

A biosensor having a core/shell nanocomposite of TiO2/rGO formed by hydrothermally coating reduced graphene oxide (rGO) flakes on titanate nanowires.