20 results about "Sio2 nanoparticle" patented technology

As a charge-transporting varnish for forming a charge-transporting thin film with excellent hole transport properties, a charge-transporting varnish is provided, comprising copper halide (I) or pseudo-copper halide (I), one of an amine selected from formulas (1) to (3), SiO2 nanoparticles, and a solvent. (where R...) 1 ~R 4 Each can independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. L represents an alkylene group having 3 to 8 carbon atoms, and oxygen atoms may be present between the carbon atoms in the aforementioned alkylene groups. However, there must be at least 3 carbon atoms between H₂N⁻ and -OH. R 5 ~R 6 Each of these can independently represent an alkyl group having 1 to 6 carbon atoms that can be replaced by a hydroxyl group, and oxygen atoms may be present between the carbon atoms of these alkyl groups. However, R 5 and R 6 (At least one alkyl group is substituted with a hydroxyl group, or an oxygen atom is present between carbon atoms.)

This application relates to an anti-icing coating, its preparation method, and its application, belonging to the field of protective coating technology. The anti-icing coating comprises a superhydrophobic self-cleaning coating and a hydrophobic and oleophobic layer stacked together. The superhydrophobic self-cleaning coating includes first SiO2 nanoparticles and fluorosilane. The hydrophobic and oleophobic layer includes second SiO2 nanoparticles, nanocellulose, chitosan nanoparticles, and a binder. The use of natural polymer materials such as nanocellulose and chitosan nanoparticles in the hydrophobic and oleophobic layer results in lower cost and better environmental friendliness. The superhydrophobic self-cleaning coating achieves superhydrophobic properties through the synergistic effect of a nano-dispersion system and a "papillary" micro-nano rough structure. The hydrophobic and oleophobic layer further enhances the coating's hydrophobic and oleophobic properties and surface lubricity, significantly reducing the adhesion of ice to the coating surface.

This invention discloses an organosilicon-modified acrylic resin coating, its preparation method, and its application, belonging to the field of surface protection technology. The organosilicon-modified acrylic resin coating of this invention comprises the following raw materials in parts by weight: 92-99 parts of organosilicon-modified acrylic resin and 1-8 parts of modified SiO2@FGO nano-hybrids. This invention achieves surface modification of graphene oxide using a silane coupling agent, and further obtains the coating through in-situ hydrolysis deposition and modification of SiO2 nanoparticles. The organosilicon-modified acrylic resin coating with composite nanofiller exhibits excellent resistance to chloride ion corrosion, carbonization, alkali resistance, weather resistance, and adhesion, and can be used for surface protection of marine reinforced concrete engineering projects.

The application relates to a multi-marker detection method of aptamer-antibody dual recognition coupling three-dimensional inverse opal hydrogel photonic crystal fluorescence enhancement, and belongs to the field of analytical chemistry and biomedical technology. Specifically, first, SiO2 nanoparticles with different particle sizes are synthesized to prepare a photonic crystal PhCs template, hydrogel precursors are permeated into the PhCs gap to obtain three-dimensional IOPCHs with different structural colors, then different target antibodies are modified to the surfaces of the different IOPCHs to realize specific recognition and enrichment of multiple targets. The detection part adopts a pre-constructed Aptamer-HCR compound, when the target is captured by the antibody fixed on the IOPCH surface, the corresponding compound directly combines the target through the aptamer, so that the amplified fluorescence signal is anchored on the IOPCH with a specific color, the PBG effect of the IOPCHs can inhibit non-radiative fluorescence decay, and the signal intensity is significantly enhanced, and the detection sensitivity is improved.

This invention relates to the field of composite material technology, specifically to an aramid honeycomb based on magnetic microwave absorbing prepreg and its preparation method. The aramid honeycomb includes an aramid honeycomb core and a magnetic microwave absorbing prepreg layer covering the surface of the honeycomb core. The magnetic microwave absorbing prepreg, by mass percentage, contains 25%-30% magnetic microwave absorbing component, 40%-45% resin matrix, 20%-25% reinforcing fiber, 5%-8% dispersant (based on the magnetic microwave absorbing component), and a curing agent with a mass ratio of 1:1.2 to the resin matrix. The magnetic microwave absorbing component is selected from one or more of coated Fe3O4@SiO2 nanoparticles, nickel-doped MXene (Ni-Ti3C2), and ultrafine Fe-Si-Cr alloy powder, mixed in any proportion. The resin matrix is ​​E-51 modified epoxy resin with a glass transition temperature Tg ≥ 120℃; the reinforcing fiber is para-aramid fiber cloth (Kevlar49) with a length of 0.15 micrometers to 0.5 millimeters; the dispersant is polyetherimide (PEI); and the curing agent is methyltetrahydrophthalic anhydride (MeTHPA).

This invention discloses a core-shell based solvent-free nanofluid, its preparation, and its application in capturing greenhouse gases. The nanofluid is formed by dispersing inorganic nanoparticles in a co-flowing phase of a bifunctional coupling agent and a polymer. The inorganic nanoparticles are core-shell SiO2@LDH composite particles, consisting of LDH nanosheets loaded on the surface of SiO2 nanoparticles. The LDH is a layered double hydroxide. One end of the bifunctional coupling agent is hydrolyzed to form silanol groups, which undergo a condensation reaction with the hydroxyl groups on the surface of the LDH nanosheets to form stable chemical bonds. The other end of the coupling agent has an epoxy group that undergoes a ring-opening reaction with the amino groups in the polymer, achieving covalent grafting. This invention solves the problems of poor stability, easy aggregation, and unclear functional regulation and CO2 capture mechanisms in existing technologies. The resulting nanofluid exhibits high dispersion stability and excellent flowability, achieving the goal of efficient CO2 capture.

This invention provides a method for preparing and applying a TENG friction layer composite material based on a complete system, belonging to the field of nano-energy materials and devices. The method includes the following steps: reacting SiO2 nanoparticles with KH556 silane coupling agent in ethanol, followed by centrifugation, washing, and drying to obtain KH556-SiO2 modified powder; using PFPE as the core material, forming an emulsion in the presence of an emulsifier, and using urea-formaldehyde resin to polymerize in situ on its surface to form a wall material, followed by centrifugation, washing, and drying to obtain PFPE microcapsules; mixing PDMS prepolymer, curing agent, PU solution, and zinc acetate, followed by stirring and degassing to obtain a uniform prepolymer matrix; adding a portion of the prepolymer matrix to KH556-SiO2 to form a surface trap liquid, which is then spin-coated onto the surface of a PTFE template to form a nanoscale trap layer; mixing the remaining prepolymer matrix with PFPE microcapsules and casting it onto the trap layer, allowing it to stand at room temperature to wet, forming a composite with a gradient structure; and vacuum curing and demolding the composite to obtain a composite film in which the surface trap layer and the deep matrix are tightly bonded.

The application discloses a coating material for optical fiber and a preparation method thereof, an optical fiber insulator and a preparation method thereof. The preparation raw material of the coating material comprises the following components in parts by weight: tetrahydrofuran acrylate 40-60 parts by weight, carboxyl modified polyurethane acrylate oligomer 30-50 parts by weight, silicone modified epoxy acrylate bifunctional linker 5-15 parts by weight, vinyl silane surface modified SiO2 nanoparticles 2-5 parts by weight, triaryl sulfonium hexafluoroantimonate cationic initiator 0.1-1 part by weight, and TPO free radical photoinitiator 0.5-4 parts by weight. According to the embodiment of the application, the silicone modified epoxy acrylate bifunctional linker in the coating layer realizes active chemical bonding between the optical fiber coating layer and the alicyclic epoxy resin sheath, reduces the physical gap and thermal stress mismatch of the multi-material interface, and thus can fundamentally improve the interface strength, internal insulation performance and long-term reliability of the optical fiber insulator.

The application discloses an engineered hepatocyte micro-nanorobot and a preparation method and application thereof, and the preparation method comprises the following steps: adding gold nanosphere dispersion liquid drop by drop into isopropyl alcohol, then adding 4-mercapto benzoic acid and polyacrylic acid in sequence and performing reaction, adding tetraethyl orthosilicate and ammonia water and performing reaction, obtaining Au-SiO2 nanoparticles and performing reaction with chloroplatinic acid and ascorbic acid to obtain an intermediate, and performing etching on the intermediate to obtain AP nanorobots; the enucleated hepatocytes expressing CXCR4 are co-incubated with the AP nanorobots functionalized by DSPE-Hyd-PEG-SH polymer; the engineered hepatocyte micro-nanorobot is based on the synergistic mechanism of cell metabolism regulation-nano-physical sensitization, can overcome the radiotherapy resistance of solid tumors, combines specific chemotactic characteristics with radiotherapy, can be targeted to accumulate in tumor tissues, and can effectively reverse the metabolic-driven radiotherapy resistance barrier.

The present application relates to a kind of flexible heat-insulating polyimide aerogel and polyimide composite aerogel with active fire extinguishing function and its preparation method, belong to aerogel technical field.Flexible heat-insulating polyimide aerogel is obtained by mixing polyamide acid and amino functionalized SiO2 Nanoparticles PAA / SiO2 Aerogel, PAA / SiO2 Aerogel is subjected to thermal imidization treatment, with good heat insulation performance.Polyimide composite aerogel with active fire extinguishing function is coated with perfluorohexanone microcapsule on the surface of flexible heat-insulating polyimide aerogel, with good heat insulation, fire extinguishing and flame-retardant performance.

The application provides a wet film, a preparation method thereof, a humidifier and an air treatment device. The wet film comprises a non-woven fabric, a PAN nanofiber layer and a SiO2 nanoparticle layer, the PAN nanofiber layer is arranged on one side surface of the non-woven fabric, the SiO2 nanoparticle layer is arranged on a surface of the PAN nanofiber layer, and the PAN nanofiber layer is located between the non-woven fabric and the SiO2 nanoparticle layer. According to the technical scheme, the non-woven fabric material is used as a base material of the humidifying film material and is compounded with the PAN nanofiber layer. The PAN nanofiber has good hydrophilic performance, the PAN nanofiber is deposited on the surface of the base material, and then the hydrophilic nano SiO2 particles are loaded on the surface of the PAN nanofiber film, so that different roughness gradients are constructed and the hydrophilic performance of the material itself is further improved. Therefore, the composite wet film has high water absorption performance and humidification capacity.

The application discloses a kind of high wear-resistant nano filler modified rubber material and preparation method thereof, belong to the technical field of rubber material modification.The water-soluble polyacrylic acid micelle is used as template, the hydrolysis rate of tetraethyl orthosilicate is controlled by controlling the amount of ammonia, and hollow SiO2 nanoparticles with porous shell and stable structure are prepared;Then modified by PEG-PLA block copolymer and silane coupling agent KH550, the particle dispersion and compatibility are improved.The modified porous hollow SiO2 particles are mixed with styrene-butadiene rubber slurry and milled, and the modified rubber material is obtained by vulcanization molding.The application improves the wear resistance and tensile strength of rubber, while maintaining good elasticity and elongation at break, achieving high strength, high wear resistance and high toughness, and the process is mild and controllable.

This disclosure relates to a low-temperature sintered silver paste with resistance to electrochemical migration and its preparation method, belonging to the field of chemical paste technology. The low-temperature sintered silver paste comprises: 60-90 parts by weight of compounded silver powder, 10-30 parts by weight of organic carrier, 0.1-3 parts by weight of functional additives, and 0.05-0.3 parts by weight of hydrophobic SiO2 nanoparticles; wherein, the compounded silver powder includes modified silver powder and composite silver powder; the modified silver powder is obtained by adding surface loading to the composite silver powder; in the modified silver powder, the surface loading has a mass part of 0.2-0.8 parts by weight; in the compounded silver powder, the modified silver powder has a mass part of 20-100 parts by weight. This achieves the construction of a dual protection mechanism of physical barrier and chemical passivation in the obtained silver paste, which is expected to significantly improve its resistance to electrochemical migration and long-term reliability while maintaining the excellent electrical and thermal conductivity of the silver paste.

This invention relates to the field of proton exchange membrane water electrolysis technology, specifically disclosing an amorphous iridium-hafnium oxide hollow nanosphere, its preparation method, and its application. The method includes the following steps: (1) using monodisperse SiO2 nanoparticles as templates, introducing an Hf precursor for hydrothermal reaction to obtain amorphous hafnium oxide-coated SiO2 nanospheres; (2) removing the SiO2 core of the amorphous hafnium oxide-coated SiO2 nanospheres by etching with an alkaline solution to obtain amorphous hafnium oxide hollow microspheres; (3) subjecting the amorphous hafnium oxide hollow microspheres to an Ir precursor for hydrothermal reaction to obtain amorphous iridium-hafnium oxide hollow nanospheres. The preparation process of this invention is simple to operate and the conditions are mild, which can significantly reduce the amount of noble metal Ir used, while greatly improving the catalytic activity and stability of the catalyst in the oxygen evolution reaction at the anode. The material of this invention is suitable for PEMWE, providing a new solution for developing low-cost, high-stability water electrolysis hydrogen production technology.

This invention discloses a vitamin C smart delivery nanocomponent based on biomimetic imprinting technology and its anti-tumor application. The core of the nanocomponent is a SiO2 nanoparticle containing cytochrome C, and the surface is directionally imprinted with a vitamin C-specific imprinted cavity using ascorbyl glucoside (AA2G), a stable derivative of vitamin C, as a molecular imprinting template. The preparation steps include: SiO2 nanoparticles containing cytochrome C. 2 The synthesis, amino-functionalization, boric acid-functionalization, template immobilization, directional imprinting, secondary amino-functionalization, template removal, and DMMA modification of NPs-CC led to the construction of the nano-component vMIPDcc containing cytochrome C in its core and having a vitamin C-specific imprinted cavity on its surface. This nanocomponent exhibits high selectivity (IF=8.4) and reliable recognition ability for vitamin C. vMIPDcc achieved an in vivo inhibition rate of 60.2% against colon cancer, providing new ideas and options for the development of anti-colon cancer drugs.

This invention discloses a high-boiling-point stable nano-heat exchange fluid and its preparation method. The heat exchange fluid uses a binary mixed base liquid composed of pure water and a polyol selected from ethylene glycol, 1,2-propanediol, and 1,2-butanediol. After adding a surfactant to the binary mixed base liquid, a nanoparticle system mainly composed of Al2O3 nanoparticles is introduced, followed by dispersion and homogenization treatment to obtain the stable nano-heat exchange fluid. The nanoparticle system may further include MWCNT nanoparticles and SiO2 nanoparticles to form composite nanoparticles, balancing enhanced thermal conductivity and dispersion stability. Compared with existing heat exchange working fluids, this invention improves the liquid-phase stable operating range, thermal conductivity, and adaptability to cyclic heat exchange by synergistically controlling the base liquid composition and the nanoparticle system. It is suitable for closed-loop high-temperature heat exchange, industrial waste heat recovery, and thermal management of electronic devices.

This application belongs to the field of cable material technology and proposes a method for preparing environmentally friendly, low-smoke, halogen-free polyethylene cable material. High-density polyethylene is melt-grafted with vinyltrimethoxysilane and triethyl borate to form a cross-linked network containing Si-O-B bonds. During combustion, this network pyrolyzes to generate B2O3 and SiO2 nanoparticles. The former melts to form a liquid layer that adsorbs free radicals to inhibit the combustion chain reaction, while the latter forms a eutectic glass phase with B2O3. Combined with ZnO nanoparticles released from the decomposition of a borosilicate-metal chelating agent as a flux, a dense glass-ceramic layer is formed in the carbon layer to isolate oxygen and heat. Simultaneously, ethylene-vinyl acetate copolymer, as a vinyl elastomer, not only improves flexibility through its toughening phase, but its vinyl groups also interact with the Si-O-B bonds of the borosilicate-grafted polyethylene, achieving a comprehensive improvement in flame retardancy, smoke suppression, and mechanical properties.

The application belongs to the technical field of nanofiltration membrane modification, and provides a positively charged composite nanofiltration membrane and a preparation method thereof.The preparation method of the positively charged composite nanofiltration membrane comprises the following steps: S1: a base layer membrane is immersed in an amino-functionalized mesoporous SiO2 nanoparticle dispersion liquid, free first reaction groups on the base layer membrane react with amino groups of the mesoporous SiO2 nanoparticles, and after solidification, an amino-functionalized mesoporous SiO2 nanoparticle intermediate layer is formed; S2: the product prepared in S1 is reacted with a separation layer reaction liquid, free second reaction groups contained in the separation layer reaction liquid react with the amino groups of the mesoporous SiO2 nanoparticles, and a separation layer is formed. The mesoporous SiO2 nanoparticles are modified by surface amino-functionalization, which provides sites for chemical grafting and provides higher positive charge, improves the adhesion of the intermediate layer to the support layer and the separation layer, and improves the rejection rate of divalent cations and water permeability.

Biomass-derived PHA oil-repellent and moisture-permeable coating, coated paper and preparation method, relate to the field of paper and paperboard manufacturing and processing. The coating contains biomass-derived polyhydroxyalkanoate, maltodextrin grafted adipic acid dihydrazide, chitosan-coated SiO2 nanoparticles, tributyl citrate and deionized water; the coated paper comprises a substrate paper pretreated by a biological enzyme and a double-layer coating formed by the coating; the preparation method comprises the steps of modified PHA emulsion preparation, substrate paper pretreatment, double-layer coating and gradient drying. The reagents used are environmentally friendly, and the product has excellent oil-repellent and moisture-permeable properties.

This invention provides a core-shell nanoparticle-modified epoxy resin and its preparation method, relating to the field of functional polymer materials technology. The method includes the following steps: preparing SiO2 nanoparticles using the Stöber method; in-situ polymerization of dopamine on the surface of the obtained SiO2 nanoparticles via molecular self-polymerization to prepare core-shell nanoparticles SiO2@PDA; using TDE-85 type epoxy resin as the matrix and core-shell nanoparticles SiO2@PDA as the modifier, preparing SiO2@PDA / EP modified epoxy resin by solution blending. The core-shell nanoparticles prepared by this invention not only have good interfacial bonding with the epoxy resin matrix but also exhibit a synergistic effect of scattering and absorbing ultraviolet light. The prepared SiO2@PDA / EP modified epoxy resin exhibits superior toughness, higher flexural strength, and excellent ultraviolet shielding performance.