38 results about "Core shell nanoparticles" patented technology

The invention discloses an optical adhesive with dynamic bond exchange and gradient curing functions and a preparation method thereof, relates to an optical adhesive, and aims to solve the problems of interface failure and light transmission attenuation which are easy to occur in the existing optical adhesive. The invention starts from the following three points: 1, two-stage dynamic covalent cross-linking: 1, UV (ultraviolet) initiates acrylate polymerization to form a main network; part of unreacted epoxy groups are retained. 2, thermally activating dynamic boric acid ester bond exchange to realize network reconstruction and stress release; 2, a dual-wavelength gradient initiation system: a 365nm UV curing surface and a 405nm LED penetrate through a curing deep layer to avoid an uncured layer caused by oxygen inhibition; 3, a nano composite anti-reflection technology: mesoporous SiO (at) TiO core-shell nanoparticles (refractive index gradient matching) improve the light transmittance to gt; the content is 99.5%.

The invention discloses light-driven toxin-enriched composite hydrogel as well as a preparation method and application thereof. The composite hydrogel comprises light-driven hydrogel and detection hydrogel, the light-driven hydrogel is agarose hydrogel doped with Au (at) Ag core-shell nano particles; the detection hydrogel is a double strand formed by an okadaic acid aptamer and a complementary sequence cDNA thereof, and a double strand formed by a domoic acid aptamer and a complementary sequence DNAzyme thereof, the hairpin H1 is used for modifying a quenching group BHQ2 at the 3'end, the hairpin H2 is used for modifying a fluorophore Cy3 at the neck part, the hairpin H3 is used for modifying a fluorophore FAM and a quenching group BHQ1 at the two ends respectively, and the metal ion doped agarose hydrogel is used for catalyzing DNAzyme cyclic shearing; and the photo-thermal driving unit is positioned on the detection function unit. According to the present invention, with the composite system of upper layer photo-thermal enrichment and lower layer dual-signal detection, the rapid and high-sensitivity simultaneous detection of the okadaic acid and the domoic acid is achieved through the combination of the photo-thermal transpiration effect and the HCR and DNAzyme cyclic shearing reaction;

The application relates to the technical field of batteries, in particular to a high-safety separator for new energy batteries and a preparation method thereof. The separator is composed of a polyethylene microporous base film and a double-sided composite coating, and the coating contains core-shell nano-aluminum oxide and a polyvinylidene fluoride copolymer binder. The interface enhancement effect of the core-shell nanoparticles makes the separator have a lower thermal shrinkage rate at high temperatures, and the puncture strength is increased to above 430 N / mm. The application solves the contradiction between the thermal stability and the ion conduction performance of the traditional separator, and is particularly suitable for a high-energy-density power battery system, and effectively improves the battery safety and the cycle life.

A method for preparing a flexible lead-free piezoelectric composite film, in which a rare-earth-doped SrSbxSc2-xTaCl2O8 precursor powder is prepared and coated with a BaTiO3 shell to form core-shell nanoparticles, and the core-shell nanoparticles are dispersed in a polyvinylidene fluoride (PVDF) matrix to obtain the flexible lead-free piezoelectric composite film. An electronic device including such piezoelectric composite film is also provided.

This invention relates to the field of temporary protective materials for glass processing, specifically a high-strength, low-emissivity temporary protective film for glass and its preparation method. The protective film is a core-shell nanoparticle-reinforced waterborne polyurethane composite film with a gradient crosslinking structure, composed of the following components: 100 parts by weight of waterborne polyurethane matrix resin, 10-20 parts by weight of a low-temperature unblocking crosslinking agent, 5-20 parts by weight of core-shell nanoparticles, and 0.5-2 parts by weight of additives. The protective film has a gradient crosslinking structure along its thickness direction, with a higher crosslinking density on the surface near the air side than on the bottom surface near the glass side. This invention significantly improves the film's density through the synergistic reinforcement of the gradient crosslinking structure and core-shell nanoparticles, achieving a surface water contact angle of over 90°. Even after 72 hours in a high-humidity environment, it maintains its integrity and good protective performance, effectively solving the technical problem of traditional water-soluble films easily absorbing moisture and softening.

The invention relates to the field of stiffness-increasing master batches, in particular to a stiffness-increasing master batch special for a degradable tobacco film and a preparation method of the stiffness-increasing master batch. The composite material comprises the following components in percentage by weight: 55-75% of a degradable polymer matrix, 20-35% of a synergistic enhancement system and 3-8% of a functional aid, the degradable polymer matrix is prepared from 40 to 60 percent of polylactic acid and 15 to 25 percent of poly (adipic acid) / butylene terephthalate; the synergistic enhancement system comprises 3%-8% of modified graphene, 12%-22% of degradable core-shell nanoparticles and 5%-10% of a bio-based stiffness increasing agent; the functional auxiliary agent is prepared from 2 to 5 percent of a degradable compatilizer, 0.5 to 1.5 percent of a bio-based antioxidant and 0.5 to 1.5 percent of a biodegradation accelerant. The invention relates to a novel smoke film material which has rigidity and antistatic property superior to those of a traditional BOPP (biaxially-oriented polypropylene) film and can be quickly and completely biodegraded in a natural environment, and unification of high performance and environmental protection property is realized.

The invention relates to a nano core-shell structure filled high-toughness epoxy resin composition and application thereof. The nano core-shell structure filled high-toughness epoxy resin composition provided by the invention comprises the following components in parts by mass: 70-100 parts of epoxy resin; 10-30 parts of a curing agent; 1 to 5 parts of core-shell nanoparticles; 5-15 parts of a diluent; 3-10 parts of an accelerant; a coating layer of the core-shell nanoparticle is polyhedral oligomeric silsesquioxane, and a core is engineering plastic. The core-shell nanoparticles play roles in absorbing energy and preventing cracks from becoming cracks. The impact strength of the epoxy composition can reach 20 kJ / m < 2 > to 30 kJ / m < 2 >, and the viscosity of the epoxy composition is 3000 mPa.s to 7000 mPa.s, so that the epoxy resin composition has excellent toughness, low viscosity and good dipping and pouring performance, and can be applied to dipping and pouring structural parts of electrical equipment.

The invention provides a preparation method of a high-elasticity wear-resistant fabric, and relates to the technical field of textile fabric preparation, the preparation method comprises the following steps: carrying out melt blending spinning to obtain composite elastic fibers, doubling and twisting the composite elastic fibers and chinlon 66 filaments to form warp yarns, and taking UHMWPE filaments as core yarns, the preparation method comprises the following steps: taking a polyurethane urea elastomer and silicon carbide and graphene core-shell nanoparticles as raw materials, taking composite elastic fibers as fasciated yarns for wrapping to form weft yarns, weaving by a three-dimensional interlacing weave process of the warp yarns and the weft yarns, forming a quincunx locking structure by interweaving points, compounding the polyurethane urea elastomer and the silicon carbide and graphene core-shell nanoparticles to form a coating precursor solution, and immersing the rough fabric blank into the coating precursor solution; the composite elastic fiber has both high elasticity and basic wear resistance, the three-dimensional interlaced weave process can further enhance the synergy of the elasticity and wear resistance of the fabric, a coil is stretched to release elasticity when the quincunx locking structure is stretched, the coil is quickly reset when the quincunx locking structure rebounds, and the wear resistance of the fabric is improved. The coating precursor solution can form a wear-resistant elastic coating which is tightly combined with fibers and structures on the surface of the fabric.

Disclosed is a method of forming a plurality of core / shell nanoparticles comprising spray coating a plurality of ZnO particles with a carbon precursor to form a plurality of clusters having a ZnO-based core and a carbon-containing shell.

This invention relates to a self-triggered demulsification Pickering emulsion cascade catalytic system, its preparation method, and its application. The preparation method includes: preparing Fe3O4 magnetic nanoparticles by co-precipitation; coating their surface with a SiO2 shell using a modified Stöber method to obtain Fe3O4@SiO2 core-shell nanoparticles; simultaneously grafting a triamine silane coupling agent and octyltrimethoxysilane onto the Fe3O4@SiO2 surface using a one-pot method to obtain magnetic amphiphilic nanoparticles; dividing the magnetic amphiphilic nanoparticles into two batches, and immobilizing glucose oxidase and Candida antarcticis lipase B respectively via EDC / NHS-mediated amide coupling reaction to obtain nanoparticle catalysts; using the nanoparticle catalysts as solid emulsifiers in Pickering emulsions to construct an oil-water two-phase cascade catalytic system, realizing a cascade catalytic reaction of glucose oxidation – peracidification – olefin epoxidation; utilizing the accumulation of gluconic acid during the reaction to lower the pH, triggering emulsion demulsification, achieving product separation and magnetic recovery of the nanoparticle catalysts.

The invention discloses a fusion membrane packaged gold-iron core-shell nano diagnosis and treatment preparation as well as a preparation method and application thereof. The preparation takes gold-iron core-shell nanoparticles as a core, and the surface of the gold-iron core-shell nanoparticles is coated with a biomimetic membrane formed by fusion of bacterial outer membrane vesicles and tumor cell membranes. The preparation method comprises the steps of synthesis of the gold-iron nano core, surface functionalization and self-assembly coating of the fusion membrane. The preparation can simultaneously exert photothermal therapy and ferroptosis induction effects under near-infrared light irradiation, effectively initiates tumor cell immunogenicity death, and cooperatively activates dendritic cells and enhances T cell immune response by means of a pathogen related molecular mode carried by the fusion membrane and a tumor related antigen. Experiments show that the preparation can significantly inhibit tumor growth and metastasis, induce long-acting anti-tumor immune memory, and provide a multi-mode synergistic nano platform for tumor immunotherapy.

The invention discloses a paint dipping method and system for an environment-friendly nano coating of a steel plate radiator, and relates to the technical field of coating processes and surface functional materials.The paint dipping method comprises the following steps that the surface of the radiator is activated, specifically, oil is removed through ultrasonic cleaning, and the surface of steel is activated through plasma micro-etching; meanwhile, spraying nano stripping liquid to form hydroxyl / carboxyl functional groups, and constructing an active interface; the preparation method comprises the following steps: constructing core-shell nanoparticles taking nano SiO as a core and polysilane as a shell, adding nano ZnO and a polycarboxylic acid dispersing agent with pH response into the coating, and determining a stable water-based nano dispersion system. The coating surface uniformity and the coating thickness are accurately monitored through near-infrared image recognition and a laser thickness measuring sensor, coating parameters are optimized in real time through an intelligent feedback control system, the stability of the coating quality is improved, automatic and intelligent quality control is achieved, and the coating quality is improved. And the coating effect of each batch of products reaches the expected standard.

The invention provides fluorine-containing polymer hollow nanoparticles, a photopolymer type holographic recording medium and application of the photopolymer type holographic recording medium, polystyrene nanospheres are swelled by a solution containing a fluorine-containing monomer, a fluorine-containing cross-linking agent and a photoinitiator, and then polymerization reaction is performed to obtain a core-shell nanoparticle emulsion; tetrahydrofuran is added into the core-shell nanoparticle emulsion, the polystyrene nanosphere template in the core-shell nanoparticle emulsion is completely dissolved and extracted out, the fluorine-containing polymer hollow nanoparticles are obtained, the photopolymer type holographic recording medium containing the fluorine-containing polymer hollow nanoparticles enables the sensitivity of a holographic grating to be larger than 100 cm / mJ, and the photopolymer type holographic recording medium can be applied to the holographic grating. The diffraction efficiency of the recording grating is greater than 95%, the refractive index modulation degree is greater than 0.2, the haze is lower than 1%, and the recording grating has excellent shear strength and tensile strength.

The invention relates to the technical field of biomedical materials, in particular to a gadolinium oxide-based nano preparation as well as a preparation method and application thereof. The preparation method of the preparation comprises the following steps: preparing gadolinium oxide nanoparticles through a hydrothermal method and amination modification, and dissolving the gadolinium oxide nanoparticles in deionized water to obtain a contrast agent solution; dropwise adding the nano-particles into a gold source solution under stirring at a certain temperature to obtain nano-particles with core-shell structures; and finally, slowly adding the synthesized dispersant solution of the water-soluble polymer into the core-shell nanoparticle solution to obtain a gadolinium oxide-based nano preparation solution. And performing post-treatment such as dialysis, freeze drying and the like to obtain the core-shell structure nanoparticles based on the gadolinium oxide nano preparation. The invention relates to a gadolinium oxide-based nano preparation for cancer diagnosis and treatment, gadolinium oxide is used as an MRI contrast agent, and a gold shell is grown on the periphery of the gadolinium oxide as a photo-thermal preparation; the hydrogel has the characteristics of good biocompatibility and the like, and has an important practical prospect in the field of preparation of diagnosis and treatment integrated medicines.

The invention relates to the technical field of medical detection, in particular to a nanoprobe for simultaneously detecting and inhibiting VCAM-1mRNA expression as well as a preparation method and application of the nanoprobe. The nano particle takes a nano Au particle as a core, and p-mercaptocyanophenyl (4-MBN) serving as a Raman signal internal standard molecule is modified on the surface of the Au core; the nano particle takes a gold layer as a shell, and a VCAM-1mRNA targeting recognition sequence segment is fixed on the Au shell; and the tail end of the VCAM-1 mRNA targeted recognition sequence segment is modified with a Raman reporter molecule Cy5. The recognition sequence segment on the nanoprobe can be specifically combined with VCAM-1mRNA to form a rigid double strand, so that Cy5 is far away from the surface of the gold core-shell nanoparticle, the SERS signal strength of Cy5 is weakened, the position of 4-MBN located on a spacing layer is unchanged, and the SERS signal of the 4-MBN is also unchanged. The expression of the VCAM-1 protein can be inhibited by the accompanying mRNA consumption in the detection process, so that the synchronous monitoring and treatment intervention of the atherosclerosis disease closely associated with the expression of the VCAM-1 are realized.

The multi-dimensional plasmonic coupling system based on Ag@PVP and Au@Ag NCs for surface-enhanced Raman spectroscopy (SERS) detection of gentamicin relates to the field of analytical detection, and adopts hydrothermal synthesis to prepare Ag@PVP core-shell nanoparticles and Au@Ag core-shell cubes (Au@Ag NCs). Ag@PVP is induced to agglomerate by gentamicin, and then Au@Ag NCs are introduced to change the electromagnetic field of the nanoparticle agglomeration, so as to change the Raman characteristic peaks of gentamicin and distinguish it from its homologues. Under the optimized experimental conditions, the linear detection range of gentamicin is 10 ‑5 ~10 ‑9 M, the detection limit is 6.23 × 10 ‑10 M, and the relative standard deviation of SERS intensity is less than 10%. The method has the advantages of simple operation, high accuracy and sensitivity, and does not need complex operation technology, and meets the requirements of large quantities and rapid analysis and detection.

To provide fluorescence-enhancing nanoparticles that do not reduce the fluorescence intensity of fluorescent dyes, but rather further enhance the fluorescence intensity.SOLUTION: Provided are fluorescence-enhancing nanoparticles comprising core-shell nanoparticles formed of a core particle and a shell, at least one fluorescent dye, and a spacer located between the core-shell nanoparticles and the fluorescent dye, the fluorescent dye having an excitation wavelength and a fluorescence wavelength, the core-shell nanoparticles having a maximum wavelength of localized surface plasmon resonance, the core-shell nanoparticles being metal nanoparticles composed of a combination of a silver core particle and a gold shell or a combination of a gold core particle and a silver shell, and the spacer being single-stranded DNA.SELECTED DRAWING: Figure 1

The invention discloses a method for quantitatively detecting creatinine in serum by pH-assisted ratio type SERS (Surface Enhanced Raman Scattering), which comprises the following steps: preparing silver-coated gold core-shell nanoparticles Au (at) MPA (at) Ag NPs with internal standard thiohydracrylic acid as an SERS substrate, and normalizing an SERS signal of the creatinine by using an internal standard signal. In addition, the pH of the creatinine is adjusted to enhance the adsorption effect of the creatinine and the nanoparticles, so that a Raman signal is enhanced. The detection method disclosed by the invention has the advantages of effectively eliminating interference of environmental factors, non-uniformity of samples, high dependence on a substrate and the like. Moreover, 2.5 mol / L of creatinine can be detected by the creatinine detection method based on the pH-assisted ratio type SERS technology, the adding standard recovery rate in a serum sample is 98.1%-107.4%, the relative standard deviation is smaller than 5.8%, and the quantitative accuracy of creatinine detection is improved.

The present application belongs to the field of nano-electronic devices and nano-processing technology, and particularly relates to a kind of nanocrystal floating gate memory based on metal core-shell nanoparticle film coated with silicon dioxide and a printing preparation method. First, print the core-shell nanoparticle film, then deposit a silane coupling agent modification layer on the single layer film by chemical vapor deposition, print a polymer intermediate layer and an oriented active layer. The printing preparation technology used in the present application has the advantages of high raw material utilization rate, good controllability and strong repeatability. The core-shell nanoparticle film prepared has low roughness and high particle number density, and can be used as a nanocrystal floating gate / tunneling dielectric composite layer. The organic semiconductor crystal prepared has high crystallinity, obvious orientation and low grain boundary density, and can be used as an active layer. The nanocrystal floating gate memory composed of the above functional layers exhibits excellent electrical performance.

The invention discloses a high-flatness PU adhesive protective film and a preparation method thereof, and relates to the technical field of protective films, the high-flatness PU adhesive protective film comprises the following components by weight: 85-95 parts of a PU adhesive, 2-5 parts of an antistatic agent, and 1-5 parts of a composite leveling agent; the composite leveling agent is prepared from epoxy modified organosiloxane, perfluoropolyether acrylate, cerium-silicon core-shell nanoparticles and hyperbranched polyesteramine according to the mass ratio of 10: 3: 2: 5; an epoxy group in the epoxy modified organosiloxane and a-NH2 group in the PU adhesive are subjected to a ring-opening reaction to form a covalent bond, so that directional fixation of molecules of the leveling agent at the interface of the protective film is realized, and surface tension mutation is eliminated; the cerium-silicon core-shell nanoparticles are of a core-shell structure formed by coating the surface of SiO2 with CeO2 nanocrystals, a rolling effect is generated in a shear force field when the surface of the protective film is coated and leveled, and the radial velocity gradient generated during coating can be compensated, so that the orange peel phenomenon on the surface of the protective film is improved.

This carbon nanotube composite comprises carbon nanotubes and core-shell type nanoparticles attached to the carbon nanotubes, wherein: each of the core-shell type nanoparticles includes a core formed from iron, and a shell having iron and sulfur covering the core; and the percentage of the number of sulfur atoms relative to the total number of iron atoms and sulfur atoms in the core-shell type nanoparticles is 6%-45%.

The application discloses a kind of medical multifunctional optical probes, belong to tumor operation navigation material technical field.The multifunctional optical probe is the gold nanostar embedding doped Gd 3+ Of magnetic silica, and further modified with polyethylene glycol on the surface of the magnetic silica shell Au@Cu 2‑x Se core-shell nanoparticle modification with near-infrared two-zone plasmonic effect.The medical multifunctional optical probe provided by the application can be applied to tumor operation navigation, and the operation resection can be guided by preoperative MR / SERS imaging and intraoperative SERS using the MATRA probe, which can significantly improve the operation effect.Immunotherapy can further remove local residual microtumor and distant metastatic tumor, thereby effectively inhibiting the recurrence and metastasis of tumor, and significantly improving the anticancer effect of 4T1 breast cancer mouse model.

The invention discloses polyvinyl pyrrolidone grafted magnetic silicon dioxide nanoparticles, a preparation method of the polyvinyl pyrrolidone grafted magnetic silicon dioxide nanoparticles and application of the polyvinyl pyrrolidone grafted magnetic silicon dioxide nanoparticles in beer clarification. The material comprises a Fe3O4 (at) SiO2 core-shell nano particle (silicon dioxide wraps ferroferric oxide nano particles) carrier and a linear polyvinyl pyrrolidone (PVP) polymer grafted on the surface of the carrier. The material can be used for efficiently adsorbing polyphenol substances in beer primary pulp, second-level rapid separation is achieved through an external magnetic field, operation is easy and convenient, good recycling performance is achieved, and a new solution is provided for beer clarification.

Disclosed herein is a core-shell nanoparticle exhibiting aggregation induced emission (AIE) properties. According to the embodiments of the present disclosure, the core-shell nanoparticle comprises a core and a shell layer encapsulating the core, in which the core comprises a polymeric matrix and one or more tetraphenylethane (TPE) embedded in the polymeric matrix. Preferably, the polymeric matrix is made of a hydrophobic polymer, and the shell layer is made of a hydrophilic polymer. Also disclosed herein are methods of producing the core-shell nanoparticle, and methods of detecting an extracellular polymeric substance (EPS) produced by a microorganism via using the core-shell nanoparticle.

The present invention relates to zinc oxide-on-carbon core-shell nanoparticles. These particles are prepared by adding a benzene derivative or pyridine derivative substituted with at least one amino and / or carboxyl group, or a small silane molecule capable of undergoing a coupling reaction with zinc oxide, as a carbon source to a nano-zinc oxide methanol solution, followed by a solvothermal reaction at 150-200°C. The zinc oxide-on-carbon core-shell nanoparticles are coated with a nanocarbon material to suppress surface defects in zinc oxide. When used in the electron transport layer of organic solar cells, they can inhibit the photocatalytic reaction between zinc oxide and non-fullerene materials, reduce the number of oxygen adsorption sites on zinc oxide, and minimize the occurrence of the "light bathing" phenomenon, thereby improving the device's air and UV stability.

This method for producing carbon nanotubes comprises: a step for preparing a carbon-containing gas, ferrocene, and a sulfur-containing auxiliary catalyst; a step for inputting the carbon-containing gas, the ferrocene, and the sulfur-containing auxiliary catalyst into the same reaction furnace, heating the same to a first temperature of 600-1,000ºC, holding the temperature at the first temperature for at least one second to thermally decompose each of the carbon-containing gas, the ferrocene, and the sulfur-containing auxiliary catalyst, and reacting sulfur obtained by the thermal decomposition of the sulfur-containing auxiliary catalyst with the surfaces of iron nanoparticles obtained by the thermal decomposition of the ferrocene to form core-shell-type nanoparticles each including a core composed of iron and a shell covering the core and having iron and sulfur; and a step for heating the core-shell-type nanoparticles and carbon obtained by a pyrolysate of the carbon-containing gas to a second temperature of 1,200-1,400ºC to grow carbon nanotubes from the core-shell-type nanoparticles, thereby obtaining carbon nanotubes.

This invention belongs to the field of medical polymer materials technology, specifically providing a controllable degradable polylactic acid-based composite material for circumcision suture devices and its preparation method. The composite material uses polylactic acid-polycaprolactone block copolymer as the matrix and adds pH-responsive core-shell nano-hydroxyapatite, compatibilizer, and plasticizer. The core-shell nanoparticles are composed of a zinc-silicon co-doped hydroxyapatite core and a poly(dimethylaminoethyl methacrylate) brush shell. In an acidic degradation environment, the brush shell expands to accelerate the release of zinc ions, thereby achieving intelligent antibacterial properties.

The invention relates to the technical field of chemical preparation technologies, in particular to a modified polyurethane material and a preparation method thereof.The preparation method comprises the following steps that dynamic covalent bond cross-linked polyether polyol and core-shell nanoparticles are dispersed at the high speed at the temperature of 110-130 DEG C; the preparation method has the beneficial effects that the contradiction between self-repairing and mechanical strength is solved through dynamic covalent bond design, optical-electric-magnetic multifunctional integration is achieved through core-shell particle directional arrangement, the structural uniformity is improved by combining gradient catalysis and a spraying process, and finally the light-weight target is achieved through foaming-printing combination. All technical points support each other to form a complete innovative chain from molecular design to macroscopic performance, so that the application boundary of the polyurethane material is obviously expanded.