39 results about "Silica microsphere" patented technology

The invention belongs to the technical field of chromatographic filling, and particularly relates to mesoporous silica microspheres, a preparation method and application. According to the preparation method, tetraethylenepentamine functional modified template microspheres and oligomeric silica anions generated by hydrolysis of a silicon source are subjected to an electrostatic anchoring effect, so that self-nucleation of the silicon source is inhibited; the surface of the template microsphere is covered by a lying configuration, so that the steric hindrance is reduced, the diffusion of a silicon precursor in a silicon source solution is promoted, and the yield of the mesoporous silica microsphere is improved; the surface of mesoporous silica is grafted and modified by octadecyl trichlorosilane silicon hydroxyl to form a highly crosslinked Si-O-Si skeleton, so that the mechanical strength of the microspheres is improved, the column efficiency loss is reduced, and the comprehensive yield and performance of high performance liquid chromatography are improved.

The invention belongs to the technical field of chemical preparation of nano-porous materials, and relates to core-shell type porous silicon dioxide microspheres, a preparation method thereof and application of the core-shell type porous silicon dioxide microspheres in structural color. The preparation method comprises the following steps: (1) mixing absolute ethyl alcohol, ammonia water and deionized water to obtain alkaline hydrolysate; (2) mixing tetraethyl orthosilicate with organosilane to obtain a silane mixed solution; (3) simultaneously and respectively dropwise adding the alkaline hydrolysate and the silane mixed liquid into the silicon dioxide microsphere dispersion liquid under stirring, and reacting to obtain an intermediate; and (4) calcining the obtained intermediate at 550-650 DEG C to obtain the core-shell type porous silicon dioxide microspheres. The preparation method of the core-shell type porous silicon dioxide microspheres is simple, easy to operate and mild in condition. The raw materials are simple, easy to obtain, non-toxic and harmless, a surfactant and a template agent are not needed, and the cost is greatly reduced.

The invention provides an electronic-grade hollow silicon dioxide microsphere as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking synthesized hyperbranched polysiloxane with a side chain functional group structure as a precursor and a nonionic surfactant as a structure-directing agent, obtaining emulsion oil drops with different structures, adding alkali, and performing in-situ conversion to form a hollow silicon dioxide microsphere structure with high porosity; a shell layer with the characteristics of higher purity, higher density, adjustable thickness and the like is formed by a sol-gel in-situ shell layer deposition technology; the compact shell layer is added to prevent resin and a solvent from entering the microspheres, water adsorption in the microspheres is reduced, meanwhile, the flowability of the microspheres in the resin can be enhanced, and the excellent performance of the hollow silicon dioxide microspheres can be played to the maximum extent. The dielectric constant Dk (at) 10GHz is less than 1.7, and the dielectric loss Df (at) 10GHZ is less than 0.1%; the material can be used as a low-dielectric-constant material, a heat-insulating material, a density-reducing filler, an insulating material and other

The invention relates to the technical field of cigarette materials, in particular to a silica microsphere with a core-shell structure and hierarchical pores as well as a preparation method and application of the silica microsphere. The preparation method of the silicon dioxide microspheres with the core-shell structure and the hierarchical pores comprises the following steps: 1) mixing a polyvinyl alcohol aqueous solution with nano silicon dioxide particles, and stirring to form floccules; (2) preparing the floccule obtained in the step (1) into a sphere, namely a core structure of the silicon dioxide microsphere; (3) wrapping the surface of the core structure prepared in the step (2) with a pre-mixed mixture of mesoporous silica particles and a pore-foaming agent to serve as a shell structure of the silica microsphere, so as to obtain the silica microsphere with the core-shell structure; and 4) performing heat treatment to form hierarchical pores in the core-shell structure of the silicon dioxide microsphere, thereby obtaining the silicon dioxide microsphere with the core-shell structure and the hierarchical pores. The silicon dioxide microsphere with the core-shell structure and the hierarchical pores has the hierarchical pores with different sizes, so that the fragrance carrying amount can be increased, and the slow release performance can be improved.

The present invention discloses a preparation method of a nano-constant temperature heat-insulating and sun-proof door and window, comprising the following steps: Step 1, preparing a nano-constant temperature heat-insulating material according to a formula; Step 2, installing a door and window frame, door and window glass and a sealing strip into a door and window body; Step 3, coating the nano-constant temperature heat-insulating material on the surfaces of the door and window glass and the door and window frame of the door and window body to obtain the nano-constant temperature heat-insulating and sun-proof door and window; wherein, in Step 1, the nano-constant temperature heat-insulating material is composed of the following components in parts by weight: 60-100 parts of fluorosilicone resin, 10-20 parts of modified silica microspheres, 20-40 parts of organic solvent, 3-8 parts of nano-oxide and 10-20 parts of auxiliary agent. By disclosing a preparation method of a nano-constant temperature heat-insulating and sun-proof door and window, the heat-insulating and sun-proof door and window includes a frame, glass and a sealing strip, and the self-made nano-constant temperature heat-insulating material of the present invention is coated after assembly, thereby realizing a production line from raw materials to finished products.

The invention relates to the technical field of polymer composite materials, in particular to a PTFE microwave composite dielectric substrate based on core-shell structure filler and a preparation method of the PTFE microwave composite dielectric substrate. The preparation method comprises the following steps: uniformly coating nano-diamond on the surfaces of hollow silicon dioxide microspheres by adopting an electrostatic self-assembly method to form a core-shell filler, then mixing the core-shell filler with polytetrafluoroethylene emulsion, and preparing the microwave composite dielectric material through calendaring molding and vacuum hot pressing methods. The nano-diamond shell layer can construct a continuous heat conduction network, and meanwhile the low dielectric constant characteristic brought by an internal hollow silicon dioxide structure is kept. In addition, the nano-diamond endows the hollow silicon dioxide microspheres with rough surfaces, and interface bonding between the hollow silicon dioxide microspheres and a polytetrafluoroethylene matrix is enhanced, so that thermal expansion is remarkably inhibited. The invention provides an effective way for solving the contradiction between the dielectric property and the thermal property of the polytetrafluoroethylene-based microwave composite dielectric material.

The invention provides an organic silicon microsphere preparation method and an organic silicon microsphere, which are used for solving the problem that the rigidity of a silicon dioxide microsphere in a flexible display is damaged so as to prepare the organic silicon microsphere with high elasticity and monodispersity. According to the method, dispersion polymerization and a sol-gel method are combined, a vinyl-containing organosilicon monomer, a base catalyst, a dispersing agent and an initiator are used, and the ratio of water to ethanol (the mass ratio is 4: 6-9: 1) is regulated and controlled to optimize the performance. Adding a dispersing agent and a monomer into the mixed solution, and stirring and clarifying under the protection of nitrogen; adding an initiator, stirring and dispersing; then reacting at 75-85 DEG C in a nitrogen atmosphere for more than 10 hours for polymerization; adding an alkali catalyst to adjust the pH value to 8-11, and carrying out stirring condensation at 18-40 DEG C; and finally, separating, washing and drying the microspheres. The stirring speed in the whole process is 250-400 rpm. According to the method, the elasticity and size of the microspheres can be adjusted through raw material selection and process control. The invention further provides the organic silicon microspheres prepared by the method, and the effectiveness of the organic silicon microspheres is verified by the embodiment.

The application provides a fluorescent structural color anti-counterfeiting material and a preparation method thereof, and the preparation method comprises the following steps: preparing composite fluorescent particles of mesoporous silica microsphere loaded halogen perovskite fluorescent particles CsPbX3, wherein X is Br, Cl or I; mixing the composite fluorescent particles with monodisperse silica nanoparticles, resin, a solvent, an initiator and an additive to obtain a mixture, wherein the volume percentage of each component in the mixture is as follows: 25-65% of the nanoparticles, 35-75% of the resin, 0.01-10% of the initiator, and 5-90% of the solvent, and the mass of the composite fluorescent particles is 0.01-3% of the mass of the silica nanoparticles; performing rotary evaporation on the mixture under vacuum to obtain concentrated paint, and after photocuring or thermal curing, the anti-counterfeiting material is obtained. The anti-counterfeiting material of the technical scheme has the dual anti-counterfeiting effects of structural color anti-counterfeiting under natural light and fluorescent anti-counterfeiting under ultraviolet excitation.

According to the spraying liquid, the anti-dazzle film and the preparation method, the spraying liquid is prepared from the two main components of the high polymer resin and the silicon dioxide microspheres, the components are simple, the transmittance, haze and coating adhesion of the film prepared from the spraying liquid are convenient to adjust, and the preparation method is convenient. By adopting the spraying liquid disclosed by the invention, the prepared spraying liquid can be sprayed to the surface of a base film which is not completely cooled or sprayed to the surface of a film casting roller through an electrostatic spraying method, and the anti-dazzle film is prepared through pressing of the film casting roller. The preparation process of the anti-dazzle film is simplified, and the time cost is saved.

The invention belongs to the field of functional coatings, and particularly relates to a wave-transparent coating with an ultralow infrared radiation characteristic and a preparation method of the wave-transparent coating. The coating is composed of a functional filler, matrix resin and an auxiliary agent according to a specific ratio, wherein the functional filler adopts a core-shell structure design of flaky aluminum powder and hollow silicon dioxide microspheres. The preparation method mainly comprises the following three key steps: synthesis of the functional filler, preparation of the wave-transparent coating with the ultralow infrared radiation characteristic, and implementation of the process. Compared with the prior art, by designing the sheet-shaped Al-coated SiO core-shell structure with the low dielectric property, the technical problem that traditional metal aluminum powder cannot give consideration to both low infrared emissivity and high radar wave transmissivity due to the high dielectric property is solved. Finally, the infrared emissivity of the coating in the wave bands of 3-5 microns and 8-14 microns is smaller than or equal to 0.3, the wave transmission rate in the X / Ku radar wave band is larger than or equal to 90%, and integrated application of infrared stealth and wave transmission performance is achieved.

This invention belongs to the field of near-field optical tweezers technology, specifically relating to a single-fiber near-field optical tweezers based on a WGM (Whole Magnetic Gland) structure. It includes a hollow silica microsphere, a laser source, and an optical fiber unit. The hollow silica microsphere comprises a shell region and a hollow region located inside the shell region, with the refractive index of the shell region being higher than that of the hollow region. The laser source emits laser light, refracting it into the shell region at an incident angle of 90°, generating an evanescent field on the outer surface of the hollow silica microsphere. The laser emitted by the source has wavelengths of 980 nm and 532 nm. This invention combines near-field optical tweezers with a WGM structure, achieving the function of capturing nanoscale particles by total internal reflection on the inner surface of the microsphere and forming an evanescent field on the outer surface. Furthermore, by changing the wavelength of the incident laser, the nanoparticles can be captured at different locations.

The present invention relates to the technical field of polarizer protective films, and provides an AG coating liquid composition, an AG coating liquid and its application, an AG film, a polarizer and a liquid crystal display. The AG coating liquid composition includes an acrylic prepolymer, an acrylate monomer and a functional factor; wherein, relative to 100 parts by weight of the functional factor, the content of the acrylic prepolymer is 60-500 parts by weight, and the content of the acrylate monomer is 30-300 parts by weight; the functional factor is an organically modified silica microsphere, and the silica microsphere is a monodisperse quartz crystal silica microsphere. The AG film obtained by the AG coating liquid composition of the present invention is applied to polarizer protection, and has the advantages of high clarity, low flash point and good appearance.

The invention belongs to the technical field of preparation of nano materials, and discloses a magnetic mesoporous nano silicon dioxide microsphere carrying a corrosion inhibitor and a preparation method of the magnetic mesoporous nano silicon dioxide microsphere. The preparation method comprises the following steps: mixing functionalized ferroferric oxide magnetic particles, a silicon source, a surfactant and a corrosion inhibitor, adding the mixture into an alkaline solution, heating and stirring, carrying out suction filtration, washing and drying, and carrying out magnetic separation to obtain the magnetic mesoporous nano silicon dioxide microspheres carrying the corrosion inhibitor. The preparation method disclosed by the invention is simple in process, simple and convenient to operate and environment-friendly, and the prepared nano-microspheres are uniform in particle size distribution and good in sphericity degree. The magnetic mesoporous nano silicon dioxide microsphere can be applied to a surface microcapsule type self-repairing corrosion-resistant coating of a magnesium alloy in the biomedical field, and magnetic-heat controllable release of a corrosion inhibitor carried by the magnetic microsphere is realized by combining the electromagnetic effect of the magnesium alloy and the magnetic characteristics of the magnetic mesoporous nano silicon dioxide microsphere; therefore, the coating is ensured to have good self-repairing effect and corrosion resistance.

The invention belongs to the technical field of nano coatings, and particularly relates to a self-cleaning nano coating for a photovoltaic panel in an alpine region and a preparation method of the self-cleaning nano coating. The coating comprises a base layer and a super-hydrophobic photo-thermal layer covering the base layer; the base layer comprises a silane coupling agent and nano titanium dioxide sol; the super-hydrophobic photo-thermal layer comprises low-surface-energy substance modified multistage micro-nano rough silicon dioxide and near-infrared absorption type tungsten bronze nanoparticles, the multistage micro-nano rough silicon dioxide comprises silicon dioxide microspheres with the particle size of 200-500 nm, and silicon dioxide nanospheres with the particle size of 50-80 nm are attached to the surfaces of the silicon dioxide microspheres. In the invention, the multistage micro-nano rough silicon dioxide has higher mechanical stability and is not easy to integrally lose efficacy when being stressed, and when the multistage micro-nano rough silicon dioxide is extruded by ice crystals, each silicon dioxide nanosphere generates tiny displacement and deformation to dissipate stress instead of fracture caused by complete rigid resistance; the near-infrared absorption type tungsten bronze nanoparticles generate heat, so that the thickness of a water film between ice and the coating is increased, and the adhesive force of an ice layer is reduced.

This invention belongs to the field of nano-coating technology, specifically a self-cleaning nano-coating for photovoltaic panels in high-altitude and cold regions and its preparation method. The coating includes a base layer and a superhydrophobic photothermal layer covering the base layer. The base layer includes a silane coupling agent and nano-titanium dioxide sol. The superhydrophobic photothermal layer includes multi-level micro / nano-roughened silica modified with low surface energy materials and near-infrared absorbing tungsten bronze nanoparticles. The multi-level micro / nano-roughened silica includes silica microspheres with a particle size of 200-500 nm, and silica nanospheres with a particle size of 50-80 nm are attached to the surface of the silica microspheres. In this invention, the multi-level micro / nano-roughened silica has higher mechanical stability and is less prone to overall failure under stress. When subjected to ice crystal compression, each silica nanosphere undergoes slight displacement and deformation to dissipate stress, rather than completely rigidly resisting fracture. The near-infrared absorbing tungsten bronze nanoparticles generate heat, increasing the thickness of the water film between the ice and the coating, and reducing the adhesion of the ice layer.

This application provides a superhydrophobic and antifouling wall paint and its preparation method. The superhydrophobic and antifouling wall paint comprises the following raw materials in parts by weight: 100 parts by weight of water-based styrene-acrylate emulsion, 5-15 parts by weight of modified hollow silica microspheres, 10-30 parts by weight of pigment, 15-30 parts by weight of filler, 0.1-0.2 parts by weight of defoamer, 1-3 parts by weight of film-forming aid, 0.1-0.3 parts by weight of pH adjuster, and 10-30 parts by weight of water. One side of the modified hollow silica microspheres is grafted with a fluorosilane coupling agent, and the other side is grafted with an oxygen-based silane coupling agent. This application, by partially hydrophobically modifying the hollow silica microspheres, causes them to migrate directionally and accumulate on the coating surface during film formation, thus endowing the coating with excellent superhydrophobic self-cleaning and antifouling properties.

This invention provides a polyimide composite film, its preparation method, and its application, belonging to the field of polyimide material technology. First, under an inert atmosphere, a first diamine monomer and a second diamine monomer are mixed in a solvent, and a dianhydride monomer is added to carry out a polycondensation reaction to obtain a polyamic acid solution. Then, a pore-forming agent or hollow silica microspheres are added to the polyamic acid solution, followed by thermal imidization curing to obtain the polyimide composite film. This invention introduces an air phase into the matrix by adding a pore-forming agent or hollow silica microspheres to the polyamic acid solution, resulting in a polyimide composite film with excellent low dielectric constant, low dielectric loss, and low coefficient of thermal expansion. The dielectric constant can be as low as 2.13 at 10 MHz, and the average coefficient of thermal expansion can be reduced to 21.97 ppm / K in the range of 5–150 °C.

The invention relates to a preparation method of a graded porous Murphy material based on cooperation of microfluidics, ink-jet printing and emulsion evaporation, and solves the technical problems that an existing preparation method of the graded porous Murphy material is harsh in condition, the porosity is difficult to regulate and control, and the prepared porous material is unstable in pore structure and low in uniformity. Silicon dioxide nano particles are introduced into an emulsion dispersion phase, self-assembly of the nano particles is driven by utilizing cohesion force generated by preferential evaporation of the dispersion phase, a silicon microsphere single-layer structure in hexagonal arrangement is formed, macroscopic pores are formed among microspheres, mesoscopic pores are formed among nano particles in the microspheres, and finally the graded porous Murphy material is obtained.

The application belongs to the technical field of structural color, and discloses a method for repeatedly constructing structural color on thermoplastic plastic and application. Nano-silica microspheres are deposited on a thermoplastic plastic substrate, and an ordered and periodic photonic crystal structure is formed through self-assembly, presenting structural color. The thermoplastic plastic substrate with the deposited photonic crystal is placed into a flat vulcanizing machine for heating and pressing, so that the photonic crystal structure and the structural color presented thereby are firmly attached to the thermoplastic plastic substrate. The thermoplastic plastic substrate with the firmly attached structural color is again placed into the flat vulcanizing machine for heating and pressing, so that the attached structural color is faded, and thus the thermoplastic plastic substrate with faded color can be colored again. The structural color obtained by the application has high color fastness, can be repeatedly colored, has the angle color change characteristic, is simple, fast, effective, green and environment-friendly, and can be applied to the fields of dyeing, decoration and anti-counterfeiting, and provides a feasible method for replacing the use of traditional dyes.

The present invention relates to the technical field of hollow silica microsphere preparation, and discloses a method for optimizing hollow silica microsphere preparation parameters based on flow field simulation. The method first plans the optimization process based on target physical property parameters and preparation conditions, specifies the reactor flow field distribution simulation, obtains microsphere morphology data for different parameter combinations, and determines parameter combination types such as high temperature, specific physical properties, and general physical properties. The method then generates a parameter optimization process set and execution sequence, and generates a list of simulation inputs and experimental configurations for each parameter combination, which are linked to form a complete solution. The method also includes determining parameter optimization boundaries, extracting optimized data subsets, and implementing targeted adjustments, corrections, and stabilization strategies for high-efficiency, low-efficiency, and critical parameter combinations. The method also includes a real-time data update process, experimental rules (dynamic adjustment of the number of experiments, triggering supplementary experiments, and equipment calibration compensation), and database management and analysis. The method improves optimization efficiency and preparation stability and is suitable for industrial production.

The application belongs to the technical field of structural color, and discloses a method for repeatedly constructing structural color on thermoplastic plastic and application. Nano-silica microspheres are deposited on a thermoplastic plastic substrate, and an ordered and periodic photonic crystal structure is formed through self-assembly, presenting structural color. The thermoplastic plastic substrate with the deposited photonic crystal is placed into a flat vulcanizing machine for heating and pressing, so that the photonic crystal structure and the structural color presented thereby are firmly attached to the thermoplastic plastic substrate. The thermoplastic plastic substrate with the firmly attached structural color is again placed into the flat vulcanizing machine for heating and pressing, so that the attached structural color is faded, and thus the thermoplastic plastic substrate with faded color can be colored again. The structural color obtained by the application has high color fastness, can be repeatedly colored, has the angle color change characteristic, is simple, fast, effective, green and environment-friendly, and can be applied to the fields of dyeing, decoration and anti-counterfeiting, and provides a feasible method for replacing the use of traditional dyes.

This invention discloses a low-dielectric wire harness and its preparation method, relating to the field of polyethylene cable technology and belonging to patent classification number H01B13 / 012. The method includes: performing a free radical grafting reaction between plasma-activated high-density polyethylene and dodecafluoroheptyl methacrylate and vinyltriethoxysilane to obtain fluorosilicone co-grafted modified polyethylene; preparing hollow silica microspheres using calcium carbonate as a template and amination; compounding organic intercalated montmorillonite with the amination hollow silica microspheres using a bridging agent and then surface fluorinating to obtain fluorinated hollow silica-montmorillonite composite filler; mixing and melt-extruding a mixture of fluorosilicone co-grafted modified polyethylene, ethylene-octene copolymer, maleic anhydride grafted polyethylene, composite filler, polyethylene wax, dimethyl silicone oil, antioxidant, and calcium stearate to obtain granules; and finally, melt-coating the granules onto the surface of a copper core conductor to obtain a low-dielectric wire harness. This invention significantly reduces the dielectric constant and dielectric loss of the wire harness and exhibits good moisture resistance and stability.

This invention provides low-melting-point rare-earth glass microspheres, a radiation-cooling coating, and a preparation method. The glass microspheres can be prepared by direct vitrification sintering, a simple method requiring minimal materials and suitable for mass production. The introduction of high-performance rare-earth oxides and other materials during preparation results in higher emission and reflection properties compared to existing silica microspheres. Using these rare-earth glass microspheres instead of silica microspheres as fillers further enhances heat dissipation.

The invention belongs to the technical field of electroforming, and particularly relates to an electroforming knotless screen scraper surface roughness surface composite electroforming technology which comprises the following steps: preparing an electroforming solution which comprises nickel sulfate, nickel chloride, boric acid, surface modified silicon dioxide microspheres, a dispersing agent, a primary brightener, a secondary brightener, a stress relieving agent and a pH regulator; by introducing the surface modified silicon dioxide microspheres, the surface roughness of the electroforming layer is improved; the uniform electroforming of the knotless screen scraper surface is realized by controlling the components and process parameters of the electroforming solution, and the method has the effects that the traditional cloud point emulsification process is replaced by introducing monodisperse 4-10 [mu] m microspheres as a nucleation template, and the accurate control of the pit structure is realized through microsphere templating.

The invention relates to the technical field of diffusion plate preparation, in particular to a high-shielding diffusion plate master batch and a diffusion plate preparation method applying the master batch, and the master batch comprises the following components in parts by mass: 40-60 parts of polybutylene terephthalate, 20-30 parts of polyethylene glycol terephthalate-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1 The material is prepared from the following raw materials in parts by weight: 10-20 parts of 1, 4-cyclohexanedimethanol ester, 10-20 parts of unsaturated polyester, 8-10 parts of rutile type TiO2, 3-5 parts of nano barium sulfate, 2-4 parts of modified porous silicon microspheres, 0.2-0.5 part of a light stabilizer, 0.3-0.8 part of a processing aid, 0.5-1 part of a dispersing agent and 1-3 parts of a compatilizer. According to the high-shielding diffusion plate master batch provided by the invention, the polyester resin is taken as a matrix, and a multi-scale shielding system is combined, so that the light transmittance of a diffusion plate prepared according to the master batch can be precisely regulated and controlled, and meanwhile, the diffusion plate has excellent mechanical properties; besides, the master batch is produced by adopting universal equipment, has the advantages of low production cost, high batch stability and the like, and is suitable for the fields of LED illumination, display screens, automobile optical components and the like.

This invention belongs to the field of optical materials technology and discloses a multilayer optical functional coating, its preparation method, and its application. The multilayer optical functional coating comprises, from the inside out, an anti-reflective layer, an anti-glare layer, and an anti-fingerprint layer sequentially disposed on the surface of a transparent substrate. The anti-glare layer is prepared from low-refractive-index sol and hollow silica microspheres, with the hollow silica microspheres dispersed in the low-refractive-index sol. This invention introduces an anti-glare layer containing hollow silica microspheres onto the anti-reflective layer and controls the content of the hollow silica microspheres to limit the gloss of the anti-glare layer within a reasonable range. This achieves low reflection and anti-glare performance while maintaining good display clarity. Furthermore, an anti-fingerprint layer is superimposed on its surface to improve surface wettability.

The application discloses a microsphere-driven double-cavity decoupled optical fiber micro-force and temperature sensor, a preparation method thereof and a sensing device, and belongs to the technical field of optical fiber sensing. The sensor is formed by cascading a polydimethylsiloxane temperature-sensitive cavity and an air cavity in an air-core optical fiber, and covering a graphene oxide film and fixing a silica microsphere on an end face, and a double-Fabry-Perot interference structure is formed. The preparation adopts a core offset semi-filling method to introduce polydimethylsiloxane, uses a pulling method to form a film, and precisely fixes the microsphere on a three-dimensional displacement platform through trace ultraviolet glue. Changes of external temperature and micro-force cause optical path drift of the temperature-sensitive cavity and the air cavity respectively, and double-parameter decoupled measurement is realized by using spectrum separation and a sensitivity matrix. Experiments show that the temperature sensitivity of the application reaches 2.233 nm / ℃ in the range of 30-60℃, and the micro-force sensitivity reaches -1.344 nm / μN in the range of 0-10 μN. The application has compact structure, simple preparation, can realize micro-newton level contact force detection, has good temperature measurement capacity, and has wide application prospects in the fields of micro-electro-mechanical system monitoring, biomechanical detection and minimally invasive medical treatment.

In order to solve the problem of serious performance attenuation caused by filler-resin interface failure in the long-term use process of an existing PVB intermediate film, the invention provides the multifunctional composite particle modified PVB laminated glass intermediate film and the laminated glass, and the intermediate film comprises a core functional layer and surface bonding layers symmetrically arranged on the two sides; the core functional layer contains interface reinforced composite particles; the interface reinforced composite particle has a core-shell structure, the core is a porous silicon dioxide microsphere, the shell is a rare earth element doped silicon-aluminum oxide layer, and the surface of the shell has a microscopic coarse structure and is grafted with a silane coupling agent containing an active functional group. The haze change rate of the intermediate film is less than or equal to 5.2% after the intermediate film is subjected to double-85 aging for 1000 hours, so that perfect balance between high tensile strength and good sound insulation is realized on the premise of extremely low haze, and strict requirements of high-end application on comprehensive performance are met.

This invention relates to a carboxyl-based magnetic silica microsphere with controllable particle size, its one-step preparation method, and its applications, belonging to the field of magnetic material preparation technology. This invention uses Fe3O4 magnetic particles as the magnetic core, with a silica layer coated on the core surface. Carboxyl groups are grafted onto the surface using aminosilane compounds and diacid compounds as functionalizing agents to obtain Fe3O4@SiO2-COOH composite microspheres. The particle size of the carboxyl-based magnetic silica microspheres is 0.5 μm-10 μm. The preparation method of this invention is simple, highly controllable, and time-efficient. The particle size of the prepared magnetic silica microspheres can be controlled between the nanometer and micrometer levels, and it can also be used for large-scale production. The prepared microspheres have good dispersibility, high magnetic content, and high carboxyl content, and can specifically bind to proteins, which can be further used for the separation of proteins and other biomolecules.

The application belongs to the technical field of sensors and the field of electrochemical analysis, and relates to a magnetic floating and non-immobilized electrochemical immunosensor, a preparation method and application thereof. The electrochemical immunosensor comprises a floating probe, a magnetic signal reporting probe and a magnetic electrode. The floating probe is formed by connecting hollow silica microspheres and a capture antibody 1. The magnetic signal reporting probe is composed of a magnetic mesoporous silica, a signal molecule and a capture antibody 2. The target biomarker is specifically combined with the capture antibody 1 and the capture antibody 2 to form a sandwich immunocomplex. The sandwich immunocomplex and the remaining free floating probe are separated and removed by buoyancy. The remaining free magnetic signal reporting probe is collected by magnetic separation. The magnetic electrode is matched with the remaining free magnetic signal reporting probe collected by magnetic separation. The electrochemical immunosensor provided by the application has the advantages of simple assembly process, simple operation, high sensitivity, good specificity, low cost and the like, and can realize quantitative detection of early biomarkers.