325 results about "Sio2 nanoparticle" patented technology

A process for preparing the nano-SiO2 coated carbonyl iron particles includes such steps as dispersing SiO2 nanoparticles and carbonyl iron particles by grinding, modifying the surface polarity of both particles by soluble caustic substance, coating the SiO2 nanoparticles on the surface of each carbonyl iron particle by physical adsorption, backing in vacuum or protective atmosphere, grinding, sieving and packing.

The invention belongs to the technical field of nano materials, and relates to a transparent self-cleaning SiO2 anti-fogging coating and a preparation method thereof. A static self-assembly method is adopted, and hierarchical mesoporous SiO2 nanoparticles and polyelectrolyte are alternately assembled to form the super hydrophilic or hydrophobic transparent self-cleaning SiO2 anti-fogging coating.The coating consisting of the hierarchical mesoporous SiO2 nanoparticles has a hierarchical porous structure and a hierarchical rough structure on the surface; and the hierarchical mesopores of the hierarchical mesoporous SiO2 nanoparticles are positioned on the surfaces of the hierarchical mesoporous SiO2 nanoparticles, and comprise 2-5nm mesopores enclosed by amorphous silicon dioxide frameworkstructures and 5-30nm mesopores enclosed by amorphous silicon dioxide framework structures. Because of the hierarchical mesopores of the hierarchical mesoporous SiO2 nanoparticles and pores among thehierarchical mesopores, the transmittance of a glass plate coated with the hierarchical mesoporous SiO2 nanoparticles is improved from 90.4 percent to 92.0 percent.

The invention relates to a superhydrophobic oleophobic modification method of a porous membrane, and belongs to the technical field of separation membrane. According to the present invention, based on the self-cleaning bionic principle, fluorosilane-modified SiO2 nanoparticles having low surface energy are dispersed in an organic solution to prepare a uniform dispersion liquid, and a porous membrane is subjected to superhydrophobic oleophobic modification by using a dynamic filtration method to prepare the amphiphobic composite membrane having good stability, wherein the water contact angle of the amphiphobic composite membrane surface can achieve 167.3+/-1 DEG C, the contact angle of diiodomethane can achieve 145.9+/-1 DEG C, and the good amphiphobic property is presented; and method has characteristics of no requirement of complex equipment, simple and easy-performing process and short preparation period, and the prepared membrane has characteristics of high flux and good pollution resistance.

A composite agricultural chemical is composed of the active component and hollow porous SiO2 nanoparticles. Its preparing process is also disclosed. It may be liquid, emulsion, powder, or dry suspension.

The invention discloses a preparation method of a ratiometric fluorescent probe for bivalent copper ions. The preparation method comprises the following steps: 1) synthetizing cadmium telluride quantum dots: controlling the molar ratio of Cd2<+>:TGA:Te2<-> in a reaction product to be 1:2.5:0.5; 2) synthetizing amino-modified carbon quantum dots; 3) synthetizing blue-fluorescence carbon quantum dots doped with SiO2 nanoparticles: during synthesis, the volume ratio of the amino-modified carbon quantum dots obtained in the step 2), a chitosan solution of which the W/V is 0.5 percent, cyclohexane, Triton X-100, hexyl alcohol, ammonia water, TEOS and APTES is 5:1:750:177:180:5:6:3; 4) dispersing the cadmium telluride quantum dots obtained in the step 1) and the blue-fluorescence carbon quantum dots obtained in the step 3) in an MES buffer solution, adding a mixed solution of EDC and NHS, carrying out stirring, centrifugation and cleaning to obtain the probe. The probe prepared according to the method comprises nano particles containing the cadmium telluride quantum dots and the amino-modified carbon quantum dots, and has nucleus-satellite hybrid spherical structures. The invention further discloses application of the ratiometric fluorescent probe to detection of Cu2<+>. The ratiometric fluorescent probe has the advantages that the detection limit is very excellent, namely only 1.0*10<7>M; the preparation is simple; no expensive equipment is required.

The invention relates to the field of nano silica processing treatment and in particular relates to a method for preparing high-expansion nano silica composite microspheres. The method for preparing high-expansion nano silica composite microspheres comprises the following steps: performing surface grafting modification on SiO2 nanoparticles by using a surface modifier; adding the modified SiO2 nanoparticles into an organic solvent, simultaneously adding a dispersing agent, monomer acrylamide, acrylic acid, a cross-linking agent and an initiator, and ultrasonically and uniformly dispersing; introducing nitrogen into the dispersed solution for bubbling to remove oxygen; carrying out a polymerization reaction after oxygen removal; and repeatedly washing by using ethanol, thereby obtaining the composite microspheres. The microspheres disclosed by the invention have high structural stability, even if the solution temperature is close to the boiling point, the microspheres do not split, and the expansion properties are improved; and moreover, the initial size of the microspheres is less than 1 micron, the microspheres can be applied to plugging of tiny cracks, the final expansion ability can be over 10 times, and the microspheres have good salt tolerance, wide application range and reliable plugging capacity.

The invention discloses an adjustable-refractivity silicon dioxide coated quantum dot nano composite luminescent material which is composed of SiO2 nanoparticles, wherein each SiO2 particle is a nano composite particle formed by coating SiO2 on a single quantum dot or a nano composite particle formed by coating SiO2 on multiple evenly-dispersed quantum dots. The invention also discloses a method for preparing the nano composite particles (each of which is formed by coating SiO2 on a single quantum dot or coating SiO2 on multiple quantum dots) by inverse microemulsion polymerization reaction. In practical use, the technological parameters, such as consumptions of TEOS (tetraethyl orthosilicate), surfactant, catalyst and quantum dots, reaction time and the like, can be adjusted to adjust the thickness of the SiO2 shell and the proportion of the quantum dot core in the SiO2 coated quantum dot nano composite particles, thereby adjusting the refractivity of the SiO2 coated quantum dot nano composite material. The refractivity of the nano composite luminescent material is adjustable within the range of 1.42-1.98.

The invention relates to a frame sealing adhesive. The frame sealing adhesive is prepared from, by weight, 5-10 parts of epoxy resin, 0.5-1.0 part of dispersing agent, 0.5-2.0 parts of SiO2 nanoparticles, 60-70 parts of acrylic resin, 0.5-1.0 part of coupling agents, 5-10 parts of heat curing agents, 0.1-1.0 part of photoinitiator, 0.1-1.0 part of molecular weight regulator, 4-6 parts of organic fillers and 5-10 parts of inorganic fillers. By means of the frame sealing adhesive, the design requirements of a narrow frame can be met, the phenomena of punctures, big heads, sawtooth shapes, nozzle blocking, slivers and burrs are avoided, and the production requirement of high-quality products is met.

The invention discloses a preparation method of mesoporous spherical Sio2 nanoparticles. The template agent used in the method is cetyl trimethyl p-methyl benzene sulfonate, the alkali source used in the method is a binary mixture comprising organic micro-molecular amine and inorganic base, the silica source used in the method is tetra alkyl silicate ester, and the molar ratio of cetyl trimethyl p-methyl benzene sulfonate to organic base to inorganic base to water is 1 to 0.03-0.06 to 0.5-2 to 0.01-0.35 to 80-500. By regulating the molar ratio of organic base to inorganic base, the particle size can be effectively controlled within 50-1000 nm. Compared with the prior art, the method disclosed in the invention has the most significant advantages that using cetyl trimethyl p-methyl benzene sulfonate as the template molecule can greatly reduce the dosage of surfactant, and regulating the molar ratio of the diacidic base can effectively regulate the final particle size. The method has theadvantages of simple processing, short cycle, low cost, and good repeatability, and is an environmental friendly synthetic method.

The invention relates to a preparation method of carbon cloth with the nanoparticle modified surface. The method comprises the steps of putting carbon cloth into an acetone solution, saturating, and drying the carbon cloth after the saturating in the air to obtain a sample A; putting the sample A and concentrated nitric acid into a hydrothermal reaction kettle; putting the hydrothermal reaction kettle into a homogeneous reactor for oxidization, cleaning the taken carbon cloth, and finally carrying out vacuum drying to obtain a sample B; putting the sample B and a silica sol solution into a reaction kettle, and carrying out reaction in a microwave hydrothermal reaction instrument; cooling a reaction system to the room temperature, and washing the sample B taken from the reaction system; finally, carrying out the vacuum drying to obtain the carbon cloth with the nanoparticle modified surface. According to the method, SiO2 nanoparticles can be evenly deposited on the surface of the carbon cloth efficiently; the prepared carbon cloth with the nanoparticle modified surface is high in surface oxygen content; the uniformity of a reticular polymer formed by a linear polymer through cross-linking action in the sulfidation process can be improved; and therefore, the carbon cloth has the superior self-lubricating property, mechanical strength and tribological property.

The invention relates to a preparation method of magnetic Fe3O4@SiO2-NH2 nanoparticles. The preparation method of the magnetic Fe3O4@SiO2-NH2 nanoparticles comprises the step of synthesizing of magnetic Fe3O4 nanoparticles, magnetic Fe3O4@SiO2 nanoparticles and the magnetic Fe3O4@SiO2-NH2 nanoparticles, wherein the magnetic Fe3O4 nanoparticles are spherical, even in particle size and good in dispersibility, the particle sizes of the magnetic Fe3O4 nanoparticles are 5-10 nm, and the heat stability is good. The magnetic Fe3O4@SiO2-NH2 nanoparticles are good in crystal structure, have unique magnetic property and can be used in various biotechnological fields such as magnetofluid, contrast agents, immunodetection, cell separation, biosensors, separation and purification of protein and nucleic acid, diagnostic reagents and enzyme immobilization.

The invention provides a modified SiO2 nanoparticle, a preparation method thereof, a nanofiber membrane containing the modified SiO2 nanoparticle, a gel electrolyte and a lithium metal battery. The modified SiO2 nanoparticle comprises an SiO2 nanoparticle and a specific ionic liquid grafted on the SiO2 nanoparticle. The nanofiber membrane is composed of a vinylidene fluoride-hexafluoropropylene copolymer and fiber consisting of the modified SiO2 nanoparticle. The gel electrolyte comprises the nanofiber membrane and a plasticizer adsorbed inside the nanofiber membrane. An electrolyte of the lithium metal battery is the gel electrolyte. According to the modified SiO2 nanoparticle provided by the invention, the mutual effect of the nanofiber membrane and the plasticizer can be strengthened, the transference number of Li+ is increased, the modified SiO2 nanoparticle is matched with the structure of the nanofiber membrane, and the ionic conductivity and specific capacity of the gel electrolyte and the cycling stability under high rate can be further improved.

The invention provides a method for enabling cement or concrete to have wave absorbing performance and a dense surface by using silicon dioxide (SiO2) coated magnetic nanoparticles. According to the method, in the presence of an externally applied magnetic field, the SiO2 coated magnetic nanoparticles are enabled to penetrate to formed cement and concrete, surfaces are enabled to be hardened, and surface layers with wave absorbing performance are formed; the SiO2 coated magnetic nanoparticles, namely MFe2O4/SiO2 nanoparticles, are of core/shell structures, are prepared by a Stober method, are relatively small in particle size and relatively strong in magnetic properties and can fully penetrate into the surface and interior of cement and concrete; by using MFe2O4 nanoparticles and SiO2 in a composite manner, the surface of cement and concrete can be hardened and can have wave absorbing performance. The method provided by the invention can be used for carrying out surface treatment on formed cement, concrete materials or existing buildings so as to form the surface layers with wave absorbing performance, is simple in process and low in cost and is applicable to mass production and application.

The invention discloses a super-hydrophobic anti-icing and deicing coating with a photothermal effect and a preparation method thereof. The preparation method comprises the following steps: preparing melanin nanoparticles with the photothermal effect from an ink bag; carrying out hydrophobization modification on SiO2 nano particles by using perfluorodecyl triethoxy silane, so as to prepare hydrophobic SiO2 nano particles; blending melanin nanoparticles and polydimethylsiloxane to prepare a spraying solution, and then spraying the spraying solution to a substrate to prepare the photo-thermal coating; finally, spraying the hydrophobic SiO2 nanoparticle dispersion liquid on the surface of the photo-thermal coating to obtain the super-hydrophobic anti-icing coating with the photo-thermal deicing performance. The coating shows excellent photo-thermal deicing performance and super-hydrophobic ice-resistant performance. The coating can be prepared by adopting a simple spraying method, and compared with a traditional preparation method and the traditional preparation method, the preparation process is simple, the method is easy to implement, the cost is low, and the coating is suitable for being popularized and used in the industry.

The invention discloses a Fe3O4@SiO2@P4VP-PDMS-P4VP hybrid nanoparticle with pH and magnetic responsiveness and a preparation method thereof and an application of the hybrid nanoparticle in a nano oil-water separation emulsion. The Fe3O4@SiO2@P4VP-PDMS-P4VP hybrid nanoparticle is obtained by coupling reaction of a pyridine group on a P4VP block in a P4VP-PDMS-P4VP triblock copolymer with pH responsiveness with a C-I active group on the superparamagnetic iron oxide nanoparticles Fe3O4@SiO2 surface and bonding the P4VP-PDMS-P4VP triblock copolymer into the Fe3O4@SiO2 nanoparticle surface. The invention further specifically discloses the preparation method of the Fe3O4@SiO2@P4VP-PDMS-P4VP hybrid nanoparticle and the application of the Fe3O4@SiO2@P4VP-PDMS-P4VP hybrid nanoparticle in the nano oil-water separation emulsion. Due to the action of the central Fe3O4magnetic nanoparticle, the hybrid nanoparticle absorbing oil content can be easily separated from an aqueous system, and the oil absorbed hybrid nanoparticle can be recycled in an acid aqueous solution after absorption.

The invention discloses a synthesizing method for silicon dioxide-silver nano-composite microspheres. The method particularly comprises the steps of preparing a Ag(NH3)2OH solution and preparing the silicon dioxide-silver nano-composite microspheres. According to the method, uniform SiO2 particles are synthesized by adopting a solution-gel method, a silver-ammonia solution and polyvinyl pyrrolidone are added, the silver-ammonia solution is reduced by ascorbic acid, and then the uniformly-dispersed dioxide-silver nano-composite microspheres are successfully prepared; by taking polyvinyl pyrrolidone as a surfactant and a dispersing agent, particle agglomeration in the silver nanoparticle synthesizing process is prevented; by loading silver nanoparticles on the surfaces of SiO2 nanoparticles, the silver using amount in the sterilizing process is decreased, and meanwhile the silver nanoparticles are prevented from being agglomerated in the catalytic process.

The invention belongs to the field of nano material preparation technology and application, and particularly relates to designing of an anti-reflection super-hydrophobic self-cleaning SiO2 nano coating and a preparation method and application of the anti-reflection super-hydrophobic self-cleaning SiO2 nano coating. The nano coating is prepared through a Czochralski method, needed instruments are simple, low in cost and automatic, and the nano coating can be prepared on a large scale and is easy for industrialization. The nano coating is composed of a bilayer nanoparticle system, the first layer is an anti-reflection coating built by small-size solid SiO2 particles, the second layer is a super-hydrophobic coating built by utilizing dendritic SiO2 nanoparticles, and the dendritic particles have hierarchical coarse structures and multiscale duct structures. The nano coating is applied to glass products, highest light transmittance can reach 96.2% which is a great increase than the light transmittance of 90.4% of original glass substrates, lowest light reflectivity can reach 2.4% which is a great decrease than the light reflectivity of 8% of the original glass substrates, and the nano coating has good super-hydrophobic self-cleaning performance.