406 results about "Silicon dioxide nanoparticles" patented technology

The invention relates to a detection method, in particular to a rapid detection method employing ultrasensitive quantum dot microsphere immunity-chromatograph test paper strips. The prior art has the disadvantage that the detection sensitivity is unable to satisfy demands of users because of high detection limit of samples, complex composition of the samples and great pretreatment difficulty. The rapid detection method of the invention comprises the steps of: preparing silicon dioxide nanoparticles, incubating the amino silicon dioxide nanoparticles with antibody for 1-10 hours in the presence of a condensation agent at 37 DEG C, and removing the antibody and the condensation agent which are failed to bond 1-4 times through high-speed centrifugation, redissolving precipitates obtained after centrifugation, adding the condensation agent and carboxylic water-soluble quantum dots, and removing free quantum dots and the condensation agent through high-speed centrifugation; preparing a silica / quantum dot composite microsphere probe; and constructing an immunity-chromatograph test paper strip system. The invention has the advantages of simple and convenient detection method, accurate and visual results, high sensitivity, low price, and wide application and can be used for semi-quantitative detection and quantitative detection.

The invention relates to a dual emission rate type fluorescent probe for visually detecting carbon dots-Au nanoclusters of mercury ions and a preparation method. Dual-emission composite silicon dioxide nanoparticles are composite silicon dioxide nanoparticles formed by utilizing carbon dot covered silicon dioxide particles as cores and covalently coupling the surfaces of the carbon dot covered silicon dioxide particles with the Au nanoclusters after surface amination. The carbon dots located in the silicon dioxide nanoparticle cores are taken as reference fluorescence signals, the Au nanoclusters on the outer layers are taken as response fluorescence signals, and the signals are used for Hg<2+> selective recognition. The Au nanoclusters as the response fluorescence signals are connected to the surface of a silicon layer through covalent bond connection, and one stable nano-fluorescent probe is formed. When the dual-fluorescence composite nanoparticles are taken as the rate type fluorescent probes, the intensity of the carbon dot fluorescence signals in the cores basically keep unchanged, and the Au nanoclusters on the outer layers can be bonded with Hg<2+> selectively so as to result in fluorescence quenching of the Au nanoclusters on the outer layers.

The invention discloses a polymer solid-state electrolyte material and a preparation method therefor. The polymer solid-state electrolyte material is an organic-inorganic hybridized and crosslinked polymer solid-state electrolyte material which is prepared by performing ultraviolet light irradiation and crosslinking on reaction raw materials, wherein the reaction raw materials comprise silicon dioxide nanoparticles grafted with sulfydryl on the surface and double-band end-capped polyethylene glycol at the mass ratio of 1 / 2 to 1 / 20; and in addition, the content of sulfydryl component in the silicon dioxide nanoparticles grafted with sulfydryl on the surface is 1-50wt.%. By means of improvement of the whole technological process, the reaction conditions in each step and the like in the key preparation process, the organic-inorganic hybridized and crosslinked polymer solid-state electrolyte material is correspondingly formed; and compared with the prior art, the ionic electrical conductivity and mechanical performance of the composite electrolyte can be improved at the same time.

The invention discloses a preparation method of graphene-coated silicon dioxide nanoparticles. Graphite powder is taken as a raw material, graphene oxide with oxygen-containing functional groups is prepared with an improved Hummers method, the silicon dioxide nanoparticles are prepared with a hydrothermal method, a proper quantity of silane coupling agents are added to a solution containing silicon dioxide and uniformly stirred, the silane coupling agents are attached to the surfaces of silicon dioxide particles, and surface-modified silicon dioxide particles are obtained; graphene oxide is added to the modified silicon dioxide solution, and surfaces of the silicon dioxide particles are completely coated with graphene oxide under the interaction of functional groups. Finally, a reducing agent is added to the solution, graphene is formed by further removing the oxygen-containing functional groups of graphene oxide, and a composite with graphene completely coating silicon dioxide is prepared. The method has the advantages that a process is simple, the reaction time is short, regulation is easy and the like. The prepared composite has the characteristics of regular structure, high porosity, low density, good hydrophobicity and the like.

The invention relates to a preparation method of a bionic artemisinin molecular imprinting composite membrane, belonging to the technical field of environmental material preparation. The preparation method comprises the following specific steps: by taking a regenerated cellulose membrane as a substrate, artemisinin as a template molecule, acrylamide (AM) as a functional monomer and ethylene glycol dimethacrylate (EGDMA) as a cross-linking agent, inlaying silicon dioxide nanoparticles with functional monomer modified surfaces to the surface of a membrane material by combination with a dopamine bionic principle, and performing two-step temperature polymerization to prepare the bionic artemisinin molecular imprinting composite membrane. The static adsorption experiment is used for making a research on the adsorption balance, dynamics and selective recognition performance of the prepared imprinting membrane. A result shows that the artemisinin imprinting membrane prepared by adopting the method is relatively high in adsorption capacity and superior in artemisinin molecular recognition penetration performance.

The invention relates to a nano-sized composite silica brick and a production method thereof. The invention is characterized in that: raw materials and binder of the silica brick are as follows: silica granules and fine powders, waste silica brick granules, calcium carbonate nanoparticles, iron oxide nanoparticles, silicon dioxide nanoparticles, fluorite powders, lime and sulfite pulp wastes. The production method is based on the existing production process of the silica brick, and introduces compound nanopowders in optimal proportions in the production process of the silica brick after high-efficiency dispersion, to produce nano-sized composite silica bricks. With the addition of nanopowders, the performance of silica brick is significantly improved, and manifested as follows: 1) the particle size fraction is more reasonable, the accumulation is compact and the texture is uniform; 2) the slurry has good plasticity and moldability and the production efficiency is improved; 3) the burning temperature is decreased to 20 DEG C, thus realizing energy conservation and discharge reduction; 4) the tridymite is superior in crystallization conversion and has low content of quartz residues; 5) the number of closed pores is increased, the number of opened pores are reduced, the porosity is reduced, and the strength and refractoriness under load are increased; and 6) the final product has good appearance, smooth end surface and good bonding property, and the rate of qualified products is increased.

The invention provides an amphiphilic Janus nano particle and a preparation method and application thereof. The preparation method comprises the following steps: dispersing silicon dioxide nanoparticles in water to obtain a dispersion liquid, mixing the dispersion liquid and liquid paraffin, heating and stirring in a water bath to form a Pickering emulsion, cooling to obtain small wax balls, adding a silane coupling agent into the small wax balls for modification to obtain modified small wax balls, mixing the modified small wax balls, an amidation catalyst and C12-C18 saturated fatty acid, andcarrying out an amidation reaction process to obtain organic hydrophobic chain grafted oil-water amphiphilic nanoparticles, and removing paraffin in the organic hydrophobic chain grafted oil-water amphiphilic nanoparticles to obtain the amphiphilic Janus nano particles. When the surfactant is used as an oil-displacing agent, oil-water interfacial tension can be effectively reduced at low concentration, rock wettability is changed, oil-displacing efficiency of nanofluid is remarkably improved, economic cost is reduced, and the surfactant has a wide application prospect.

The invention discloses a super-oleophobic coating material and a preparation method thereof. A super-oleophobic coating is obtained by establishing a porous coating through an ice template with gas-hpase silicon dioxide nanoparticles and dopamine as structure units and conducting processing through a two-step CVD method. The preparation method is green and environmentally friendly, and can not pollute the environment. The super-strong adhesive capacity of polydopamine is achieved through biological material-dopamine polymerization. The super-oleophobic coating can be applied to metal materials, inorganic nonmetallic materials, polymer materials, natural materials and the like, and a solution of the super-oleophobic coating universal for various different materials is provided.

The invention discloses a water-resistant high-temperature-resistant single-component waterborne polyurethane adhesive and a preparation method thereof and relates to the technical field of polyurethane adhesives. The adhesive comprises, by weight, 30-40 parts of polytetrahydrofuran glycol, 15-22 parts of polycarbonate diol, 3-7 parts of poly-2,6-polyethylene naphthalate polyester glycol, 17-25 parts of diisocyanate, 2-5 parts of chain extender, 0.5-2 parts of silane coupling agent modified silicon dioxide nanoparticles, 0.1-0.6 part of dibutyltin dilaurate, 4-8 parts of acetone, 1-3 parts oftriethylamine, 0.05-0.1 part of sodium hydroxide and an appropriate amount of water. Polytetrahydrofuran and polycarbonate diol are adopted as oligomer polyhydric alcohols in raw materials for preparing polyurethane, and added poly-2,6-polyethylene naphthalate polyester glycol is introduced to a soft-segment part of polyurethane; by adding silane coupling agent modified silicon dioxide nanoparticles, the mechanical properties and heat resistance of the adhesive can be improved; the prepared adhesive is high in adhesive force and excellent in water resistance and high temperature resistance, and the application range of the adhesive is enlarged.

The invention relates to self-repairing paint and a preparation method thereof, and belongs to the technical field of metal protection. The preparation method comprises the following steps: adding self-made mesoporous silicon dioxide nanoparticles into a benzotriazole ethanol solution, and stirring to obtain mesoporous silicon dioxide nanoparticles loading a corrosion inhibitor; adding the mesoporous silicon dioxide nanoparticles loading the corrosion inhibitor into a zirconium n-propoxide alcohol solution and stirring; adding a nitric acid solution and stirring; filtering to obtain filter residues; adding the filter residues into a chitosan solution; after carrying out ultrasonic dispersion, centrifugally separating to obtain sediment; adding the sediment into a sodium alginate solution; after carrying out the ultrasonic dispersion, centrifugally separating to obtain a layer-by-layer packaged corrosion inhibitor; finally, uniformly stirring epoxy resin, a diluting agent, a curing agent, the layer-by-layer packaged corrosion inhibitor and a dispersant, and carrying out the ultrasonic dispersion to obtain the self-repairing paint. The self-repairing paint has the advantages of simplicity in preparation, large load capacity and corrosion inhibitor release-response function, and has a good repairing capability on coating corrosion damages caused by the natural environment.

The invention relates to a method for preparing a micro / nanocomposite photocurable resin. The method for preparing the micro / nanocomposite photocurable resin is characterized by comprising the following steps of: 1) surface modification of nanoparticles, namely utilizing silicon dioxide nanoparticles as a nono-filler of a dental repair resin, and introducing a C=C double-bond functional group which can react with a resin monomer through two-step modification: (1) modifying by using gamma-aminopropyltriethoxysilane to introduce an amino group to the surfaces of the silicon dioxide nanoparticles, and (2) reacting the silicon dioxide nanoparticles with aminated surfaces and glycidyl methacrylate to introduce double bonds which can participate in a resin polymerization reaction to the surfaces of the nanoparticles; and 2) compounding of the modified nanoparticles, a resin and an initiator, namely adopting bisphenol A - glycidyl methacrylate and triethylene glycol dimethyl acrylate, introducing silicon barium glass powder serving as a microfiller and the modified nanoparticles, and adding a photoinitiator to obtain the micro / nanocomposite photocurable resin. The method has the characteristics of low cost and simple process.

The invention relates to a transparent super-hydrophobic self-cleaning coating. Silicon dioxide nanoparticles with active hydrophobic groups are synthesized by virtue of a one-step direct hydrolysis method, a coating is prepared, and then a high-transparency self-cleaning coating is obtained. The self-cleaning coating comprises the following components in percentage by weight: 1%-10% of the silicon dioxide nanoparticles with the active hydrophobic groups, 90%-98% of alcohol solvents and 0.1%-1% of an aid. After the film formation, the light transmittance of the coating is higher than 98%, and the water contact angle is larger than 150 degrees. The coating has good self-cleaning performance and can be widely applied to architectural glass curtain walls, automotive glass, photovoltaic assemblies, optical devices and the like.

The invention relates to a polydimethylsiloxane-dual scale silicon dioxide composite super-hydrophobic coating and a forming method thereof. The composite super-hydrophobic coating comprises a polydimethylsiloxane layer and silicon dioxide particles uniformly dispersed on the polydimethylsiloxane layer. The composite super-hydrophobic coating is obtained by a method of curing a polydimethylsiloxane coating material containing large-particle-size silicon dioxide nanoparticles and then firing the coating, and the composite super-hydrophobic coating is of a secondary rough surface structure. According to the invention, the durability of the coating is strengthened, and the super-hydrophobic performance of the surface is recovered by a method of polishing or re-firing, so as to keep the excellent performance of the coating for a long time.

The invention belongs to the technical field of nanometer material science and micro-fluidic chips, and relates to a preparation method of a paper chip modified based on fluorescent molecular imprinting silicon dioxide nanometer microspheres. The problem that the paper chip cannot achieve complex functional modification easily is solved. The preparation method comprises the steps that monodispersity silicon dioxide nanoparticles are prepared through a sol-gel method, and surface amidated modification is carried out on the silicon dioxide nanoparticles; fluorescent conjugated polymers having high selectivity and sensitivity for nitrobenzene are synthesized through an Suzuki reaction; the conjugated polymers are bonded through a covalent bond and crosslinked to the surfaces of the silicon dioxide nanoparticles to form the fluorescent molecular imprinting silicon dioxide nanometer microspheres; the fluorescent molecular imprinting silicon dioxide nanometer microspheres are evenly fixed to the surface of the detection area of the paper chip, and therefore the paper chip modified based on the fluorescent molecular imprinting silicon dioxide nanometer microspheres is obtained. Functional modification can be rapidly and easily carried out on the paper chip, and therefore high-sensitivity detection on micro nitrobenzene in water is achieved.

The invention discloses a polymer film with antifouling property. Silicon dioxide nanoparticles or titanium dioxide nanoparticles with amphoteric ionized surfaces are evenly dispersed in the polymer film, wherein the surfaces of the nanoparticles are coated with carboxyl anion-ammonium cation zwitter-ion pairs; the content of the silicon dioxide nanoparticles or the titanium dioxide nanoparticles in the polymer film is 0.3-10wt%; the surface contact angle of the polymer film is reduced to below 50%; the secondary water flux recovery rate in an antifouling separation test reaches over 95%; and the antifouling property is obviously improved.

The invention discloses a preparation method of nanofluid cooling liquid and the nanofluid cooling liquid prepared by the same. The preparation method comprises the following steps of: uniformly mixing dibasic alcohol, de-ionized water and alkali to obtain basic liquid; adding ethyl silicate into the basic liquid and hydrolyzing the mixture to obtain nanofluid containing silicon dioxide nanoparticles; and adding a dispersion stabilizer, a corrosion inhibitor and a coloring agent into the nanofluid to obtain the nanofluid cooling liquid. The preparation method provided by the invention has the characteristics of simple equipment and process, mild conditions, high raw material utilization rate, low cost, easiness for large-scale production and the like. The prepared nanofluid cooling liquid has high stability and high heat exchange capacity.

The invention discloses a super-hydrophilic, self-cleaning and antifogging coating. The coating comprises a bonding layer, and hydrophilic composite nanoparticles with rough surfaces, wherein one surface of the bonding layer is bonded with the hydrophilic composite nanoparticles, and the other surface of the bonding layer is connected with a base material; and the hydrophilic composite nanoparticles are prepared from amino silane modified silicon dioxide nanoparticles and epoxy silane modified silicon dioxide nanoparticles by ring-opening reaction bonding of amino and epoxy. According to the super-hydrophilic, self-cleaning and antifogging coating, the hydrophilic composite nanoparticles with the rough surfaces are adopted and prepared from two silicon dioxide nanoparticles by chemical bond combination; and in addition, a hydrophilic polymer which can be bonded with the hydrophilic composite nanoparticles is used as a filming bonding agent for realizing the force bonding of the base material and the rough hydrophilic composite nanoparticles, thus the high-temperature sintering treatment is avoided, and the technical problem of severe condition of the preparation of an existing super-hydrophilic coating can be effectively overcome.

The invention discloses a novel charged polyamide composite nanofiltration membrane and a preparation method thereof. The method comprises the following steps: grafting charged polymer onto the surface of the silicon dioxide nanoparticles by active / controllable free-radical polymerization to obtain charged-polymer-modified silicon dioxide nanoparticles; dispersing the charged-polymer-modified silicon dioxide nanoparticles and amine monomer in water to prepare a water-phase amine monomer solution; dissolving acyl chloride monomer in an organic solvent to prepare an oil-phase acyl chloride monomer solution; and immersing the polymer ultrafiltration membrane into the water-phase amine monomer solution, and immersing into the oil-phase acyl chloride monomer solution to obtain the novel polyamide composite nanofiltration membrane of which the separating layer contains the charged-polymer-modified silicon dioxide nanoparticles. The method is simple and easy to implement, has the advantages of low production cost and obvious, stable and permanent modification effect, and has favorable industrialization application prospects.

The invention discloses a preparation method of silicon dioxide@ quantum dot composite nanoparticles. The method comprises steps as follows: thiolation silicon dioxide nanoparticles are prepared firstly, and the silicon dioxide@ quantum dot composite nanoparticles are prepared with a hydrothermal method. The preparation method is simple and easy to implement, high in yield and efficiency and beneficial to large-scale production. The prepared silicon dioxide@ quantum dot composite nanoparticles comprise silicon dioxide balls with particle sizes of 50-800 nm and quantum dot particles loaded on the silicon dioxide balls. The excellent fluorescence property of quantum dots is preserved, centrifugal separation of the particles is facilitated due to the fact that the quantum dots are loaded on silicon dioxide, the aftertreatment steps during use of the quantum dots are greatly optimized and simplified, and the preparation method has a broad application prospect.

The invention relates to the field of oil and gas drilling, in particular to super-amphiphobic Janus particles suitable for a chip carrying agent for an oil base drilling fluid and a preparation method and an application thereof. The Janus particles are silicon dioxide nanoparticles with dissymmetric modification on surfaces, wherein the part of surfaces of the Janus particles are modified by a first modifying group provided by silane as shown in a formula (1) and the rest parts of surfaces of the Janus particles are modified by a second modifying group provided by silane as shown in a formula(2). By combining the particularity of Janus particle structure and the performance asymmetricity, the particles play bubbling and stabilizing roles in an emulsified oil base drilling fluid. An efficiently chip carrying oil base drilling fluid system formed by taking the super-amphiphobic Janus particles chip carrying agent as a core treatment agent improves the drilling speed and the well purification efficiency of a complex well, thereby further promoting continuous exploration and development of irregular oil and gas reservoirs. The formulae are as shown in the description.

The invention discloses silicon modified double-component waterborne polyurethane composite coating for automobile varnish and a preparation method thereof. The composite coating is prepared from a component A and a component B, wherein the component A is silicon modified waterborne polyacrylate emulsion; the component B comprises a hydrophilic isocyanate curing agent, graphene and an auxiliary agent; the silicon modified waterborne polyacrylate emulsion contains methyl methacrylate, butyl acrylate, styrene, acrylic acid, a copolymer of beta-hydroxyethylmethacrylate and polysiloxane with double bonds, and silane modified silicon dioxide nanoparticles. According to the composite coating, the polysiloxane, silicon dioxide nanoparticles and the graphene are uniformly introduced into matrix resin, so that the attachment force and the water resistance of the composite coating are effectively improved; meanwhile, the hardness and the strength are increased and the composite coating is especially suitable for the automobile varnish.

The invention discloses a sapphire surface treatment technology, and particularly discloses a sapphire polishing solution and a preparation method thereof. The sapphire polishing solution comprises a deionized water solution, silicon dioxide nanoparticles, a dispersing agent, a complexing agent and a pH regulator, and is prepared by the steps of: firstly, adding the dispersing agent and the complexing agent into the deionized water; then, adding the silicon dioxide nanoparticles into the solution, continuously stirring, and simultaneously carrying out ultrasonic treatment for 5-8minutes until the dioxide nanoparticles are completely dispersed; and finally, adding the pH regulator into the mixed solution to adjust the pH value to be 9-11.5. According to the invention, the sapphire polishing solution is directly prepared by the silicon dioxide nanoparticles, so that the prepared polishing solution is low in solid content, effectively saves the preparation time and cost, has the characteristics of high polishing efficiency and long storage time, and is easy for subsequent cleaning technology; less additive which is mostly inorganic additive is used by the invention, so that the sapphire polishing solution is free from harm to the environment and the human body, and has good environmental protection property; and the preparation method is simple, effectivele, very low in requirements and easy to produce.

The invention provides a solid polymer electrolyte doped with modified nanofiller and a preparation method of the solid polymer electrolyte and belongs to the technical field of solid polymer electrolyte materials. The novel solid polymer electrolyte doped with modified nanofiller is prepared by mixing dopamine coated silicon dioxide nanoparticles grafted with polyethylenimine on the surfaces, lithium salt, polyoxyethylene, polyethylenimine and an organic solvent capable of dissolving polyethylene oxide and then drying the mixture for film formation. The preparation method comprises the steps as follows: preparing the dopamine coated silicon dioxide nanoparticles, grafting the particles with polyethylenimine on the surfaces, preparing an electrolyte mixed solution and preparing an electrolyte film. The preparation technology is simple, high in efficiency and low in production cost, and the prepared solid polymer electrolyte for lithium ion batteries has better thermal stability and mechanical strength as well as excellent safety performance and has very bright market prospects.

The invention discloses a method for loading siRNA (small interfering Ribonucleic Acid) by using mesoporous silicon dioxide nanoparticles. In the method, the siRNA is induced into a pore cannel of the mesoporous silicon dioxide nanoparticles, so that loading of the siRNA is realized, and the loading capacity of the siRNA in the particles can be adjusted. The invention has the advantages: siRNA molecules are prevented from being separated from the pole canal under the condition of physiological environment; the surfaces of the loaded nanoparticles can be further decorated; and the method has a good application prospect.

The invention relates to a reinforcement material for preservation of cultural relics, and a preparation method and an application thereof. The reinforcement material for the preservation of the cultural relics is an organic silicon composite material prepared by a sol-gel reaction by using tetraethoxysilane as a matrix, silicon dioxide nanoparticles and terminal-hydroxyl polydimethylsiloxane as terminal-hydroxyl polydimethylsiloxane modifiers, wherein the mass ratio of the tetraethoxysilane to the nanosized silicon dioxide and to the polydimethylsiloxane is 100 : (0-25) : (0-6).

The invention relates to the field of chemistry and materials, in particular to a new method for preparing multi-metal-oxygen cluster-doped silicon dioxide nanoparticles, which is developed by performing the hydroxylation modification of the surface of a multi-metal-oxygen cluster by using electrostatic interaction and introducing the hydroxylated multi-metal-oxygen cluster into silicon dioxide by a sol-gel process. The multi-metal-oxygen cluster-doped silicon dioxide nanoparticles prepared by the method have the characteristics of controllable size, high monodispersity and the like, and the reaction yield is 100 percent. The method ensures the complete structure of the multi-metal-oxygen cluster and the physical and chemical properties of the multi-metal-oxygen cluster. The obtained nano material, when used, can effectively prevent the leakage of the multi-metal-oxygen cluster and therefore is widely applicable to a majority of multi-metal-oxygen clusters.

The invention provides a pH responsive drug-loading Pickering emulsion and a preparation method thereof. The method comprises the step of preparing sodium alginate modified silicon dioxide nanoparticles which are prepared from the Ugi reaction of sodium alginate, formaldehyde, cyclohexyl isocyanide and fractal silicon dioxide, wherein the fractal silicon dioxide is prepared in the manner of utilizing layering molecular imprinting to perform covalence assembling on amino blocked silicon dioxide and aldehyde blocked silicon dioxide and repeating the imprinting process according to the requirement till reaching the required layer number of the silicon dioxide. The invention also provides a Pickering emulsion prepared from the nanometer particle. The invention can prepare a novel pH responsive Pickering emulsion in the manner of grafting sodium alginate (Alg) onto the fractal SiO2 surface through Ugi condensation reaction, can enrich the application of the triggering emulsion in a pesticide release controlling system and can widen the application of the Pickering emulsion at the aspect of pesticide delivery.

The invention discloses a wear-resistant super-hydrophobic coating layer and a preparation method thereof. An absolute ethyl alcohol dispersion liquid of hydrophobic silicon dioxide nanoparticles is uniformly mixed with a single-component waterborne polyurethane aqueous solution to obtain a hydrophobic silicon dioxide nanoparticle / single-component waterborne polyurethane dispersion liquid, then the dispersion liquid is brushed or sprayed on a base material, and cured at room temperature for 5 h to obtain the wear-resistant super-hydrophobic coating layer. The prepared super-hydrophobic aqueoussolution can be stored in a sealed manner for a long time, can be coated as required, can be cured at room temperature, and is quite convenient. The base material can be any one of glass, metals, plastics, ceramics and stone. The static water contact angle of the surface of the wear-resistant super-hydrophobic coating layer is 151 DEG-153 DEG, the rolling angle of the surface of the wear-resistant super-hydrophobic coating layer is 4 DEG-6 DEG, and the wear-resistant super-hydrophobic coating layer can rub 1800 cm on 320-mesh abrasive paper along a straight line under the pressure of 2500 Pa.The method has the advantages of being simple in preparation process, convenient to operate, green, environmentally friendly, low in cost and the like, has high practical value and application prospects, and can be applied to various fields.

The invention relates to a preparation method to prepare silicon dioxide nanoparticles with the magnetic monodisperse. The processes are as follows: (1) excess ammonia is added into the aqueous solution containing Fe3+ and Fe2+ salts to obtain the black precipitate of Fe3O4; (2) the precipitate is transferred to the alcohol-water solution of sodium oleate and the pH value is regulated to the acidity; (3) sodium silicate is added into the solution, heated and ultrasonically treated and then the silicon dioxide nanoparticles with magnetic disperse is obtained; (4) the coupling agent is added to react to obtain the silicon dioxide nanoparticles with surface modified magnetic monodisperse. The method is provided with low-cost raw material, simple process, low energy consumption and small amount for the necessary equipment. The silicon dioxide nanoparticles produced by the method is provided with excellent performance, which can fully meet the application requirement in the a plurality of fields such as: the drug carrier, the immobilization of the enzyme, the cell sorting, the immunity detection, the separation and hybridization of the nucleic acid.

The invention discloses functional mesoporous silicon dioxide nanoparticles with an effect of resisting ageing and a preparing method and application of the functional mesoporous silicon dioxide nanoparticles. According to the preparing method, a sol-gel method is adopted to prepare mesoporous silicon dioxide particles, and then the mesoporous silicon dioxide particles are mixed with a silane coupling agent to conduct a reaction to obtain an intermediate product. The intermediate product is mixed with an ageing-resistant agent or an ageing-resistant agent intermediate to conduct a reaction to obtain the functional mesoporous silicon dioxide nanoparticles. The functional mesoporous silicon dioxide nanoparticles are added into a rubber matrix, and a rubber composite material with a good reinforcing effect and an ageing-resistant effect is obtained. The functional mesoporous silicon dioxide nanoparticles can effectively improve the ageing-resistant performance and the physical and mechanical performance of the rubber composite material, and also have a very good application prospect in a high-performance rubber composite material; meanwhile, the method in which the mesoporous silicon dioxide nanoparticles serve as nanometer carriers to load high-molecular auxiliaries has an important reference significance in preparing other functional high-molecular auxiliaries.