542 results about "Silica microsphere" patented technology

The invention belongs to the surface patterning microstructure construction technique, which relates to a method for constructing a microstructure with anti-reflection performance on a foundation base by combining the self-assembly technique with the reactive ion beam etching technique. The method is to take monolayer polymeric micro-spheres, silicon dioxide micro-spheres and nano-particles of metal or metal oxides as a barrier layer and implement the RIE etching to the foundation base, then an approximate cone-shaped microstructure is constructed on the foundation base, and the structure has extreme high anti-reflection performance, thereby effectively improving the light energy utilization rate, reducing the interference of veiling glare in an optical system, increasing the optical transmittance, and further improving the sensitivity and stability of the optical system, and the method can be used for constructing large-area anti-reflection structures. The method of the invention has advantages of simple operation, changeable foundation base, strong applicability, good repeatability, low cost, high efficiency, adjustable anti-reflective applied wavelength and conformity to industrialized standards, and can be used for making photoelectric devices such as solar batteries and white light sensors.

An emulsion composition for skin application comprises an aqueous component, one or more water-insoluble organic components totaling at least about 15 percent by weight of the composition, and about 2 to about 10 percent by weight of a solid component consisting of porous silica microspheres having an average particle size between about 5 μm and about 20 μm.

The invention belongs to the technical filed of water paint, which particularly relates to nanometer hollow silica sphere/polyurethane compound water paint and the process for preparation thereof. The water compound paint is chemically compounded by hollow SiO2 sphere, whose dimension is 50-250 nanometers, isocyanate terminated polyurethane prepolymer, catalyst and other auxiliary agents. Indoor temperature storage stability of the compound water paint is excellent, nanometer hollow SiO2 sphere and water polyurethane have excellent compatibility, hardness and compatibility of the water compound coating layer are greatly improved, and fire-resisting property and ultraviolet resistant performance are excellent. The process for preparation of the invention has the advantages of convenient and simple technique, high film coating quality, low production cost and extensive application prospect and the like, which has no pollution to environment, the water paint is a new generation environmental-friendly high-performance chemical product, which can be applied in the fields such as automobile coating, wood coating, construction, office furniture, leather, textile finishing, pigment printing and mechanical equipment.

The invention belongs to the technical field of catalysis and relates to a method for preparing a monatomic cobalt catalyst by roasting silicon dioxide pellets and immobilizing metalloporphyrin. The method is realized by adopting the following technical scheme: namely stirring and dispersing nano silicon dioxide particles, dropwise adding 3-aminopropyl triethoxy silane, so as to obtain amino modified SiO2 pellets, then linking monocarboxyl metalloporphyrin (CoTPCPP) onto an amino modified SiO2 carrier through organic complexing, carbonizing porphyrin through high-temperature calcination in an inert atmosphere, and loading highly dispersed cobalt atoms onto the amino modified SiO2 pellets, thus an amino modified silicon dioxide pellet loaded monatomic cobalt catalyst is obtained. The monatomic dispersion catalyst has high catalytic activity and stability on a molecular oxygen selective ethylbenzene catalytic oxidation reaction in absence of solvent; meanwhile, a preparation method is simple, and product quality can be easily controlled, so that the monatomic dispersion catalyst is applicable to the fields of alkane selective oxidation reactions and synthesis of medical intermediates.

The invention discloses one-component transparent waterborne polyurethane emulsion waterproof paint and a preparation method thereof and relates to polyurethane waterproof paint. The waterproof paint comprises a resin phase and a nano-material phase. The preparation method comprises the following steps: diol and a hydrophilic chain extender are dried, and other prepolymerization monomers are dried; diol, diisocyanate, fluorine-containing acrylate monomers and hydroxyl-terminated siloxane after a dehydration process are added to a four-neck flask, the mixture is heated and added with an organic tin initiator for a reaction under the protection of nitrogen, and the mixture is heated and added with dimethylolpropionic acid for continuous reaction; after a reaction system is cooled, the chain extender and acrylate monomers are added for a reaction; after a prepolymer is cooled to the temperature lower than the room temperature, a neutralizer and a cross-linking agent are added; then deionized water is added for emulsification, and mixed liquor A is obtained; a silane coupling agent is dissolved in absolute ethyl alcohol, silica microspheres are added to absolute ethyl alcohol, and mixed liquor B is obtained; the mixed liquor B is added to the mixed liquor A, the mixture is heated, and a radical initiator is added for a reaction; an organic solvent is removed, and the one-component transparent waterborne polyurethane emulsion waterproof paint is obtained.

The invention pertains to the technical field of composite materials and function materials, in particular to a functionalized hollow silica microsphere and a preparation method thereof. The functionalized hollow silica microsphere is formed by taking polystyrene microspheres with positive charge as a template and by taking alkali as an etchant and a catalyst to lead silane coupling agent to carry out condensation and hydrolysis on the surfaces of the polystyrene microspheres; meanwhile, the polystyrene microspheres are etched. The varied functional groups functionalized hollow silica microspheres prepared by the invention have small density, large specific area and special functional groups, thereby being used for absorbing heavy metals, proton exchange membrane conductivity modifiers, functional filling and functional material carriers.

The invention relates to a preparation method of antimicrobial, and aims at providing a preparation method of mesoporous hollow spherical silver-loaded silicon dioxide antimicrobial, which comprises the following steps that polystyrene microspheres are added into mixed solution of ethanol with dissolved hexadecyl trimethyl ammonium bromide and de-ionized water to be uniformly mixed, then ammonia is added, ethyl orthosilicate is gradually dropped, the obtained solution is filtered, washed and dried to obtain compound powder with polystyrene being wrapped by silicon dioxide microspheres; the powder is subjected to heat preservation at the temperature of 550 DEG C to obtain hollow silicon dioxide microspheres; and under a light-resistant condition, the hollow silicon dioxide microspheres are soaked inside silver nitrate solution, and then the solution is filtered, dried and heated to the temperature of 300 to 500 DEG C so as to obtain the mesoporous hollow spherical silver-loaded silicon dioxide antimicrobial. The dispersivity and the stability of silver particles are improved, so that the agglomeration problem of traditional nano antimicrobial powder can be effectively solved. Meanwhile, the antimicrobial can be slowly released through mesoporous, the releasing of silver particles can be effectively maintained for a long time so as to realize the lasting antibacterial effect.

The invention relates to a preparation method of echinoid titanium dioxide microspheres in single/double layer cavity structure, belonging to the field of nano composite materials. The method comprises the following steps: (1) preparing monodisperse silicon dioxide microspheres with uniform particle size; (2) by using silicon dioxide as a template, coating a titanium dioxide layer on the surface of the silicon dioxide microspheres by using a sol-gel method to obtain core-shell type silicon dioxide/titanium dioxide composite microspheres; (3) regulating the concentration of sodium hydroxide solution, the hydrothermal reaction time and other conditions, and preparing echinoid titanium-base microspheres in the single/double layer cavity structure in a controllable way; and (4) treating the echinoid titanium-base microspheres in the single/double layer cavity structure with hydrochloric acid with a certain concentration, and calcining at high temperature to obtain anatase-type echinoid titanium dioxide microspheres in the single/double layer cavity structure. The material prepared by the method has the high-activity pure-phase titanium dioxide crystal structure, and has the advantages of large specific area, complete appearance and high yield; the technical process is controllable and easy to operate; and the invention also has the advantages of low preparation cost, no pollution and low energy consumption.

A preparation method of graphene oxide/ silicon dioxide hybrid aerogel comprises the following steps: A, adding 0.05-0.1 mol of a precursor into 9-18 ml of distilled water and dropwise adding a hydrolyst with its concentration of 0.2-0.6 mol/L into the precursor aqueous solution, wherein molar ratio of the hydrolyst to the precursor is 1:20-1:100; stirring at 20-30 DEG C for 5-8 h; adjusting pH value to 6-7 and stirring for 5-45 min so as to obtain a dispersion containing silicon dioxide microspheres; B, adding water to dilute the silicon dioxide microsphere dispersion by 5-50 times, carrying out iso-volume mixing on the diluted silicon dioxide microsphere dispersion and a graphene oxide dispersion with its concentration being 0.6-2 mg/ml, stirring for 10-30 min, carrying out ultrasonic treatment for 10-30 min so as to obtain graphene oxide/silicon dioxide hybrid aerogel; and C, freezing the hybrid aerogel under liquid nitrogen for 5-10 min, freeze-drying and dewatering to obtain the graphene oxide/silicon dioxide hybrid aerogel. The method is environmentally friendly, and the technology is simple. The prepared hybrid aerogel has advantages of complete gel network structure, high porosity, good adsorptivity, high strength, low density and the like.

The invention relates to a preparation method of covalent organic framework composite microspheres with core-shell structures. The method comprises the following steps: dissolving silicon dioxide microspheres, a first construction element and a second construction element in an organic solvent; and after adding a catalyst, rapidly synthesizing into the composite microspheres with core-shell structures at a certain temperature. In a preparation process, reaction conditions are gentle, the method is simple, and the yield is high; the prepared covalent organic framework composite microspheres have the advantages of good core-shell morphology, high specific surface area, ordered pore structures, good mechanical stability, thermal stability, chemical stability and the like, if the microspheres are used as a chromatographic stationary phase, the chromatographic mass transfer resistance can be reduced effectively, the theoretical plate height is improved, and finally, column efficiency and degree of separation are improved; and if the microspheres are used as solid-phase extracting filler, the enrichment effect can be improved remarkably. The covalent organic framework composite microspheres with core-shell structures have good application prospects in the aspect of separation and enrichment of small organic molecules.

The invention relates to a hollow silicon dioxide microsphere with different surface configurations prepared in the same system and a preparation method thereof, belonging to the technical field of functional inorganic powdery materials. The hollow silicon dioxide microsphere with the different surface configurations has the diameter of 500 nm-4 mum and the shell thickness of 40-125 nm; a spherical shell is formed by packing and connecting silicon dioxide nano particles; gaps among the silicon dioxide nano particles forming the spherical shell range from 0 nm to 100 nm; and the silicon dioxide nano particles forming the spherical shell have nano micropores or mesopores, pore diameters range from 1.6 nm to 2.4 nm, specific surface areas range from 290 m2/g to 1400 m2/g, and pore volumes range from 0.24 ml/g to 1 ml/g. The invention also provides the preparation method of the hollow silicon dioxide microsphere with the different surface configurations. The regulation and control means of the surface configuration of the hollow silicon dioxide microsphere is simple and easy to operate; the reaction process for preparing the hollow silicon dioxide microsphere with a multi-stage pore path structure is short; and especially the control means is simple.

The invention belongs to the field of the synthesis of magnetic nano materials, and relates to a method for preparing a silicon dioxide magnetic composite microballoon with a core-shell structure. The method comprises the following steps: adding magnetic iron oxide nano particles monodispersed in water into the mixing solution of alcohol and ultrapure water, and stirring for 0.3-2h; then adding 0.01-1ml of tetraethyl silicate in the mixture, and stirring for 0.3-2h; then adding 0.5-5ml of stronger ammonia water, continuing to stir for 2-24h, and obtaining the solution of the silicon dioxide magnetic composite microballoon with the core-shell structure; and using applied magnetic field for separating the microballon from the solution. In the invention, by proportioning the quantity of the reactant reasonably, and setting the reaction conditions reasonably, one or a plurality of the iron oxide magnetic nano particle(s) are covered in each produced silicon dioxide microballoon, and the microballoon has good balling performance and monodispersity, has controllable shell layer thickness and narrow particle size distribution, and is easy to clean, simple and convenient in operation, low in cost, less in waste, and high in productivity.

The invention relates to a mesoporous nano silicon ball compound targeting drug delivery system as well as a preparation method and application thereof. The preparation method of the mesoporous nano silicon ball compound targeting drug delivery system comprises the following steps: 1) preparing amino-functionalized drug loading mesoporous silicon dioxide microspheres; 2) preparing hyaluronic acid-hydrosulphonyl polypeptide-adriamycin (HA-RGD-DOX); 3) preparing mesoporous microsphere-hyaluronic acid-hydrosulphonyl polypeptide-adriamycin--paclitaxel (MSNs-HA-RGD-DOX_PTX); and 4) preparing fluorescent marker modified mesoporous microsphere-hyaluronic acid-hydrosulphonyl polypeptide-adriamycin--paclitaxel compound (MSNs-HA-RGD-DOX-PTX). The mesoporous nano silicon ball compound targeting drug delivery system has the beneficial effects that firstly multi-targeting synergistic drug delivery is realized, multiple tumour cells and tissues can be killed, and reversal drug resistance is good; secondly, blood stability is excellent; thirdly, invisibility, drug release degree and controlled release properties are good; fourthly, in vivo tracing function is good; and fifthly, the mesoporous nano silicon ball compound targeting drug delivery system has good general applicability.

The invention relates to a method for preparing magnetic silicon dioxide microspheres with the surfaces chelated with metal ions; the method of the inventioncomprises the following steps of preparation of the magnetic silicon dioxide microspheres, epoxidation of the magnetic silicon dioxide microspheres, carboxylation of the magnetic silicon dioxide microspheres and chelation technique of metal ions. Compared with the existing preparing method, the method of the invention has the advantages of reasonable design, simple operation and large amount of chelation of metal, etc. The magnetic silicon dioxide microspheres with the surfaces chelated with the metal ions, which are prepared by adopting the method, contain cobalt ions, have stronger bonding force with the modified microspheres so as to lead the cobalt ions to be not easy to leak out, and have higher selectivity and proper bonding strength with histidine on the protein, thus leading the magnetic silicon dioxide microspheres with the surfaces chelated with the metal ions to have high selectivity to hexameric histidine tag protein, and being easy to realize the separation and the purification of the target protein; the magnetic silicon dioxide microspheres with the surfaces chelated with the metal ions, which are prepared by adopting the method, can be used for separating the hexameric histidine tag protein.

The invention discloses a preparation method of mono-disperse silicon dioxide micro-spheres, which comprises the following steps of: (1) synthesizing mono-disperse silicon dioxide micro-sphere seeds by using a Stober method, namely at a reaction temperature of 10 to 60 DEG C, and in a solvent system of alcohol, water and ammonia, adding tetraethoxysilane alcoholic solution of which the concentration is 0.1 to 0.5 mol/L to react so as to obtain the mono-disperse silicon dioxide micro-sphere seeds; and (2) preparing the silicon dioxide micro-spheres from the silicon dioxide micro-sphere seeds by using a seed growth method, namely preparing silicon dioxide seed solution of which the concentration is 1,015 to 1,017 seeds/L by using the silicon dioxide micro-sphere seeds, the ammonia and the alcohol, and at the reaction temperature of 10 to 60 DEG C, adding ammonia-alcohol solution of which the concentration is 0.5 to 5.0 mol/L and tetraethoxy-silicane alkanol solution of which the concentration is 0.1 to 5.0 mol/L to react so as to obtain a suspension of the mono-disperse silicon dioxide micro-spheres.

The invention relates to a method for preparing a hollow nano silica microsphere modified polyacrylate nuclear shell structure composite emulsion thin film. The thin film is prepared from a polyacrylate resin serving as a matrix and hollow nano silica microspheres prepared by a template method serving as filler through coupling agent treatment, ultrasonic dispersion, emulsion polymerization and coating process. The thin film has the characteristics of high damping property and mechanical property of the hollow nano silica microspheres prepared by the template method. The preparation method has the advantages of simple process, low cost, short period and convenient industrialized production.

The invention relates to the field of anti-reflection technology for the surface of glass, and concretely relates to a nanometer core-shell silicon dioxide microsphere and a composite coating solution which is compounded by the nanometer core-shell silicon dioxide microspheres and aluminum silicon sol as well as preparation methods thereof. A cation type polystyrene emulsion is used as a hard template in order to prepare silicon dioxide dispersion liquid with a nanometer core-shell structure, the dispersion liquid and the aluminum silicon sol are compounded in order to prepare the coating solution for an antireflection film, toughening treatment is carried out for the coating solution in order to obtain the antireflection film. The raw materials are easy to obtain, and the antireflection film with a hollow structure is prepared by a simple process; pore spaces are arranged in particles and are not arranged in a silicon dioxide network, so that high light transmittance of the film is guaranteed, the light transmittance reaches 94.5% or above, and the porosity is high; the film has excellent smudginess resisting performance, the antireflection film and a glass substrate can be firmly combined, and the hardness of the film is high; because the surface of the film is compact, the film has good blocking effects for steam erosion, good weatherability, and industrialized application values.

The invention relates to a molybdenum disulfide/graphene hollow composite microsphere with a layered porous hollow microsphere-shaped structure, and a synthetic method for the molybdenum disulfide/graphene hollow composite microsphere, and belongs to the technical field of micro-nano composite material preparation and synthesis. The method comprises the steps: firstly preparing a silicon oxide microsphere; secondly assembling a positive ion polyelectrolyte layer on the surface of the silicon oxide microsphere, and enabling the silicon oxide microsphere to be positively electrified; thirdly assembling a oxidized graphene layer on the surface of the positively electrified silicon oxide microsphere, and obtaining a silicon oxide/oxidized graphene composite microsphere; fourthly depositing and growing a molybdenum disulfide nanosheet on the surface of the silicon oxide/oxidized graphene composite microsphere through employing a hydrothermal method, reducing the wrapped oxidized graphene to graphene at the same time, and then obtaining a silicon oxide/graphene/molybdenum disulfide composite microsphere; finally removing a silicon oxide core through employing the hydrothermal method and excessive hydrofluoric acid, and forming the molybdenum disulfide/graphene hollow composite microsphere through synthesis. When the composite microsphere serves as the electrode material of a supercapacitor, the microsphere is large in specific capacitance, is excellent in circulating charging and discharging stability, and presents a good application prospect.

The invention belongs to the technical field of detection, and particularly relates to a method for manifesting latent fingerprints. The invention provides the method for manifesting the latent fingerprints. A magnetic brush is used to attract magnetic powder; the powder forms a 'magnetic powder ear' under the action of magnetic force; and the latent fingerprints on the surfaces of A4 paper, sheet glass, plastic bottles, pop-top cans, sheet copper, aluminum foils, tables or experiment tables can be manifested by using the tip of the powder ear to slightly brush various object surfaces printed with the latent fingerprints. The method is based on magnetic ferroferric oxide nano-powder and utilizes an phase reversal microemulsion polymerization method to prepare fluorescent magnetic silica gel spheres; and the method jointly coats magnetic granular ferroferric oxide and dye molecules in silicon dioxide microspheres by utilizing the hydrolysis of TEOS under alkaline conditions to perform one-step synthesis of magnetic silica monodisperse gel spheres and dye-doped magnetic fluorescent silica gel spheres to obtain magnetic fluorescent multi-functional powder, can be applied to more conditions and ranges, and has simple operation and no toxic or side effect.

The invention discloses a preparation method of ordered mesoporous silica microspheres with hollow structures. The preparation method comprises the following steps: firstly, dissolving a cationic surface active agent in mixed solution of ethanol and water, sequentially adding ammonia water and a silicon source in the mixed solution under the conditions of heating and mixing, and reacting for a period of time to obtain solid silica microspheres; washing the obtained silica, transferring the silica into water for etching, and reacting for a period of time to obtain hollow silica microspheres; and finally, collecting the hollow silica, and obtaining products of ordered mesoporous silica microspheres with hollow structures by drying and roasting. In the preparation method, a sacrificial hard template or an emulsion template does not need to be prepared in advance. The preparation method has the characteristics of simple technological process, mild reaction conditions, low cost, and environmental friendliness; and the prepared hollow mesoporous silica microspheres have great application potential in ultrasonic imaging, drug delivery and other biomedical fields.

The invention discloses a method for preparing a mesoporous silicon dioxide microsphere with controllable aperture. The method takes a novel tetra-quaternary ammonium salt cation surface active agent as a structure-directing agent and synthesizes the mesoporous silicon dioxide microsphere in an ethanol water system under the alkaline condition by a sol-gel method. The method has the advantages that the prepared silicon dioxide is micron spherical particles and has good monodispersion and large specific surface area; the mesoporous microsphere with large aperture can be prepared without an expanding agent; and the silicon dioxide microsphere prepared by the method has stable performance and is suitable for high-efficiency liquid-phase chromatographic separation and analysis.