37 results about "Titanium dioxide nanoparticles" patented technology

The invention discloses a method for growing titanic acid / titanium dioxide nanoparticles on a titanium carbide Mxene sheet layer, and relates to a method for growing titanic acid / titanium dioxide nanoparticles on the surface of a titanium carbide Mxene sheet layer structure. The method comprises the following steps: firstly, etching titanium aluminum carbide at room temperature by adopting hydrofluoric acid to obtain a layered titanium carbide Mxene material, then dispersing the layered titanium carbide Mxene material in hydrogen peroxide with the mass percent concentration of 20-30%, simultaneously adding 0.6 ml of 65% nitric acid, and reacting for 24-72 hours at the temperature of 20-80 DEG C, so that titanic acid nanoparticles can grow on the surface of a titanium carbide Mxene lamellar structure; and subsequently carrying out heat treatment in an air atmosphere at 200-500 DEG C, and converting the titanic acid into anatase titanium dioxide. The preparation temperature is low without high pressure; the nanoparticles keep a lamellar structure aggregation state, and are expected to be applied to the fields of adsorption, photocatalysis and the like.

The invention discloses a radiation refrigeration material, a preparation method and a preparation device, and the radiation refrigeration material comprises a primer layer, a middle paint layer and a finish paint layer, the primer layer is doped with titanium dioxide nano particles; the middle paint layer is doped with aluminum oxide or barium sulfate nanoparticles; and the finish paint layer is doped with silicon dioxide nanoparticles and a fluorescent material. The preparation method of the radiation refrigeration material comprises the following steps: S1, respectively preparing the primer, the intermediate paint and the finish paint through weighing, stirring, grinding and filtering processes; s2, the surface of an object is coated with primer, and a primer layer is formed; s3, the surface of the primer layer is coated with intermediate paint, and an intermediate paint layer is formed; and S4, the surface of the middle paint layer is coated with finish paint to form a finish paint layer. The radiation refrigeration material preparation device comprises a stirring barrel, a stirring shaft and a feeding pipe. According to the scheme, the spectral selectivity, durability, environmental friendliness and attractiveness of the refrigeration material can be effectively guaranteed.

This invention relates to the field of self-cleaning coating materials, and discloses the preparation and application of a nanofiber-confined Fe single-atom self-cleaning coating material. The invention uses wood nanofibers as a carbon-based carrier to obtain nanofiber-confined Fe single-atom materials. The three-dimensional network structure generated during the acidic hydrolysis of methyl orthosilicate enhances the bonding between the nanofiber-confined Fe single-atom materials, nano-silica, and nano-titanium dioxide nanoparticles. After hydrolysis, a diluent is added, and the reaction proceeds to obtain the nanofiber-confined Fe single-atom self-cleaning coating material. This self-cleaning coating material has a simple process, high operability, excellent antistatic properties, superhydrophilicity, and photocatalytic activity. It exhibits excellent anti-fouling potential in self-cleaning coating material applications and has broad application prospects.

The application provides a titanium dioxide microwhisker, a preparation method and an application. The titanium dioxide microwhisker is prepared by the following method: (1) providing a titanium sol solution; (2) adding titanium dioxide nanoparticles into an alcohol solution of sodium dodecyl benzene sulfonate to obtain a titanium dioxide solution; (3) mixing the titanium sol solution and the titanium dioxide solution to obtain an electrostatic spraying solution; and (4) electrostatically spraying the electrostatic spraying solution, collecting the product and drying to obtain the titanium dioxide microwhisker. The obtained titanium dioxide microwhisker has a microscale size and a large specific surface area, and the preparation method is simple and can be used for industrial production in large quantities.

The invention discloses a modified titanium disulfide nanosheet reinforced aluminum-based composite material. The modified titanium disulfide nanosheet reinforced aluminum-based composite material is composed of 85-95 wt% of an aluminum alloy matrix and 5-15 wt% of modified titanium disulfide nanosheets. Wherein the reinforced phase modified titanium disulfide nanosheet is a mesoporous titanium dioxide nanoparticle composite titanium disulfide nanosheet, the molar ratio of titanium dioxide to titanium disulfide is 1: (3-4), the reinforced phase has good conductivity, the binding force of a mesoporous structure and a matrix is strong, and the mechanical property of the material can be effectively improved. According to the preparation method of the aluminum-based composite material, a high-energy ball milling method and a vacuum melting method are combined, the impurity content of the material can be reduced, and the distribution uniformity of a reinforced phase is improved. The whole material has high strength and high hardness, the conductivity superior to that of commercial pure aluminum, the comprehensive mechanical property is excellent, and the application prospect is wide.

This invention relates to a sialylated glycoprotein detection reagent, its preparation method, and its application, belonging to the field of biodetection technology. The detection reagent uses purified water as a solvent and comprises the following components: surface-modified titanium dioxide nanomaterials, metal ions, a pH adjuster, and a solvent. The surface-modified titanium dioxide nanomaterials are obtained by dispersing titanium dioxide nanoparticles in an organic solvent and reacting them with a silane coupling agent. The pH value of the sialylated glycoprotein detection reagent is ≥ 8.0. The reagent of this invention utilizes the high affinity of modified titanium dioxide nanomaterials for sialic acid to specifically aggregate sialylated glycoproteins in blood into particles, facilitating observation. This reagent exhibits good stability, high sensitivity, and strong specificity, making it suitable for rapid tumor screening of blood smear samples.

The invention discloses a nano-composite pressure-reducing injection-increasing oil displacement system and a preparation method thereof, and belongs to the technical field of petroleum and natural gas exploitation chemical agents, the nano-composite pressure-reducing injection-increasing oil displacement system comprises: an acid base solution: hydrochloric acid, hydrofluoric acid, ethylenediaminetetra (methylene phosphonic acid) or ethylenediaminetetraacetic acid; a block type quaternary ammonium salt-betaine surfactant; fluorine-modified graphene oxide; modifying the titanium dioxide nano particles by using amino silane; silica nanoparticles; a fluorocarbon discharge aiding agent; an organic silicon defoaming agent; and deionized water. Through the synergistic effect of nano-compounding and molecular design, the integrated performance of pressure reduction, injection increasing and oil displacement is achieved, and the oil displacement agent is suitable for pressure reduction, injection increasing and oil displacement operation under the high-temperature and high-salt reservoir condition.

The invention provides a fiber-reinforced silicon zirconium oxide composite aerogel thermal insulation material and a preparation method thereof, and belongs to the technical field of thermal insulation materials. The invention relates to a fiber-reinforced silicon zirconium oxide composite aerogel thermal insulation material and a preparation method thereof. The preparation method comprises the following steps: providing silicon oxide fibers, and carrying out pretreatment to obtain a silicon oxide fiber preform; the preparation method comprises the following steps: preparing cerium-doped titanium dioxide nanoparticles from tetrabutyl titanate, cerium nitrate, absolute ethyl alcohol and water by adopting a sol-gel method; the preparation method comprises the following steps: adding a silicon source and zirconium oxychloride into an ethanol solution, stirring, adjusting the pH value to 3.0-4.0, adding cerium-doped titanium dioxide nanoparticles, and continuously stirring to form sol; and S3, soaking a silicon oxide fiber preform into the sol prepared in the step S3, pressurizing to fill the silicon oxide fiber preform with the sol, and after gelation, performing aging treatment, freeze drying and heat treatment to finally obtain the product. On the basis of improving the thermal insulation performance of the product, the mechanical property of the product is improved, and the phenomena of shrinkage, collapse and the like generated in the use process of the product are reduced.

The invention relates to the technical field of anti-dazzle films, in particular to a flexible anti-dazzle film with a super-hydrophobic surface and a preparation method and application of the flexible anti-dazzle film. Comprising a PET substrate, PU nano-fibers forming a network are embedded in the PET substrate, a fluorinated titanium dioxide nano-particle coating is arranged on the surface of the PET substrate, the light transmittance of the prepared flexible anti-glare composite film can reach 92.1%, the haze can reach 93.3% and is far better than that of a commercial anti-glare film in the prior art, and meanwhile the flexible anti-glare composite film has the advantages that the super-hydrophobicity is achieved, the water contact angle is 165 degrees, the sliding angle is 1.2 degrees, and the anti-glare effect is good. The self-cleaning and anti-fog functions are realized.

The application discloses a preparation method of visible light response water dispersible titanium dioxide nanomaterial. Under a solvothermal condition, in an alcoholysis process of alkoxy titanate, the alcohol hydroxyl is oxidized into aldehyde group by sodium hypochlorite by using the reducing property of low-carbon dihydric alcohol, and is further oxidized into carboxyl group, which is adsorbed on the surface of newly generated titanium dioxide nanoparticles to give the material excellent water dispersibility. Meanwhile, the oxidation product, chlorine ion, enters the titanium dioxide lattice to form chlorine ion doped titanium dioxide nanomaterial, which expands the absorption spectrum of titanium dioxide to the visible light region and improves the utilization efficiency of sunlight.

The invention discloses a preparation method of titanium dioxide nanocrystals and a stable dispersion liquid of the titanium dioxide nanocrystals, and belongs to the field of titanium dioxide. The preparation method comprises the following steps: mixing a titanium source and an alcohol solvent to form an alcohol solution of the titanium source; dropwise adding acid, mixing and stirring, then dropwise adding water, and continuously mixing and stirring; carrying out reflux reaction, cooling after the reaction is finished, and separating to obtain titanium dioxide nanoparticles; and the boiling point of the alcohol solvent is 150-260 DEG C. The preparation method also comprises the following steps: washing the titanium dioxide nanoparticles, dispersing the titanium dioxide nanoparticles in a solvent, dropwise adding the surface modification ligand, uniformly stirring, separating and drying to obtain yellow powdery solid particles. The method overcomes the problems of insufficient TiO2 crystallization, low electron mobility and poor dispersion stability in the existing low-temperature sol-gel acid catalysis system, is a synthetic method capable of forming high-mobility anatase phase TiO2 nanocrystals at a relatively high temperature, and realizes long-term stable dispersion of the anatase phase TiO2 nanocrystals in ethanol / isopropanol and other solvents.

The invention provides a detection method of a microstructure of a polypropylene / elastomer composite material. The detection method comprises the following steps: dispersing and mixing titanium dioxide nanoparticles and polypropylene to prepare titanium dioxide / polypropylene master batch; carrying out melt blending on the titanium dioxide / polypropylene master batch to prepare a mixture; mixing the mixture with an elastomer to prepare a composite material; and carrying out hot-pressing vulcanization on the composite material to prepare a sample to be detected, and observing the microstructure of the sample to be detected. According to the detection method, post-treatment dyeing is not needed, the microstructure can be observed in real time in the preparation stage of the composite material, and the detection method has the advantages of being rapid, efficient, low in cost and the like.

The invention provides photovoltaic cell glass and a manufacturing method thereof. The photovoltaic cell glass comprises a glass substrate; the antireflection layer is arranged on one side of the glass substrate; the antireflection layer is of a structure formed by solid silicon dioxide nanoparticles; the functional composite layer is arranged on one side, far away from the glass substrate, of the antireflection layer; the functional composite layer comprises hollow silicon dioxide nanoparticles and titanium dioxide nanoparticles; and the titanium dioxide nano particles are arranged in gaps between adjacent hollow silicon dioxide nano particles. The antireflection layer and the functional composite layer with specific structures are arranged in the photovoltaic cell glass, so that high light transmittance is realized, and a self-cleaning function is considered.

The invention provides a low-temperature activated sintering method of a solid waste-based high-temperature heat storage material, which comprises the following steps: pretreating a solid waste matrix by using alumina nanoparticles and titanium dioxide nanoparticles as interface modifiers, and generating a low-temperature eutectic phase through interface reaction with silicon-aluminum oxide in the solid waste matrix; carrying out preheating treatment by adopting electromagnetic wave irradiation, and preheating in an alternating electromagnetic field with a specific frequency by utilizing the dielectric response characteristic of iron and calcium components in a solid waste matrix; periodically modulated inert gas is introduced to ionize the gas jet, the inert gas is ionized to form a plasma state, and ions bombard the surfaces of particles under the driving of an electric field or a pressure gradient to form aluminum ion vacancy defects, so that atom migration motion is accelerated, and the interface diffusion activity is improved; a staged power regulation and control model is adopted, and the input power is dynamically regulated in each stage of heating, heat preservation and cooling. One technical effect of the invention is that lower sintering temperature, higher material density and lower unit energy consumption can be realized.

This application relates to the technical field of food testing, specifically disclosing a gas chromatography-mass spectrometry (GC-MS) method for detecting flavor components in baked goods based on a modified composite extraction layer. The modified composite extraction layer disclosed in this application comprises the following components: modified activated carbon, PDMS prepolymer, polyethylene glycol, a functionalized metal composition, a curing agent, a solvent, a dispersant, and a photoinitiator. The modified activated carbon is prepared by immersing it in an ethanol solution of a silane coupling agent, ultrasonically treating it, drying it, and then treating it with argon plasma. The functionalized metal composition consists of zinc oxide nanoparticles and titanium dioxide nanoparticles with a particle size of 20-80 nm. The composite extraction layer and detection method disclosed in this application solve the problems of low accuracy in flavor detection under high moisture and high matrix interference conditions in baked goods, easy decomposition of heat-sensitive flavors, and weak anti-contamination ability of the extraction layer. It can achieve efficient, accurate, and stable detection of multiple flavor components in baked goods.

The invention discloses a preparation method of a titanium dioxide and high-entropy alloy composite material for an ion battery, and belongs to the technical field of preparation of battery materials and nano composite materials. The method comprises the following steps: uniformly mixing titanium dioxide nanoparticles and a high-entropy alloy precursor; in an inert atmosphere, placing the composite precursor and metal sodium in a sealed environment together, heating to a preset temperature, carrying out a reduction reaction, and carrying out heat preservation at the temperature for a period of time; and removing residual metal sodium from the obtained product in an inert atmosphere, and cleaning and drying the final product. The composite materials with different chemical components can be prepared by controlling the types and contents of metal elements in the high-entropy alloy precursor. In the prepared composite material, the high-entropy alloy nanoparticles are uniformly loaded on the surfaces of the anatase-phase titanium dioxide nanoparticles, so that the conductivity and the ion diffusion rate of the material are effectively improved, and the composite material shows excellent electrochemical performance when being applied to negative electrodes of lithium-ion and sodium-ion batteries.

The application discloses a disposable foldable sunscreen mask based on mask material and belongs to the technical field of sunscreen products. The mask comprises a mask body made of non-woven fabric material for masks, and the outer surface of the mask body is coated with a sunscreen coating layer containing titanium dioxide nanoparticles with a thickness of 0.01-0.03 mm. The mask can be folded and stored as a whole, and after being unfolded, the mask is in the shape of a mask and is adapted to the contour of the face. The mask is provided with a silica gel elastic edge around the eyes and a mouth and nose opening, and the two side edges are connected with elastic ear hooks with adjustable length. The application has the advantages of low cost, disposable use, good sunscreen effect, foldable portability, comfortable wearing and wide application.

The invention discloses a titanium dioxide-quantum dot-silicon dioxide composite material with a multilayer core-shell structure as well as a preparation method and application of the titanium dioxide-quantum dot-silicon dioxide composite material. The core layer is composed of titanium dioxide nano-particles, the quantum dot middle layer is adsorbed to the surface of the core layer in a bridging mode through a silane coupling agent, and the compact silicon dioxide shell layer wraps the quantum dot middle layer. The method comprises the following steps: titanium dioxide nanoparticles are subjected to silanization modification to introduce sulfydryl, quantum dots are subjected to ligand exchange to obtain water-soluble sulfhydrylated quantum dots, the water-soluble sulfhydrylated quantum dots and the titanium dioxide nanoparticles form a quantum dot-titanium dioxide compound through interaction of the sulfydryl, and finally, a silicon dioxide shell is formed through silicon source hydrolytic condensation under a weak alkaline condition. Through core-functional layer-shell collaborative design, the problems that a traditional quantum dot composite material is weak in binding force, the quantum dots are prone to falling off and the stability is poor are solved, and the quantum dot composite material can be widely applied to the fields of photoelectric devices, photocatalytic materials and biological fluorescent markers.

The invention relates to the technical field of textile yarns, in particular to a phase-change constant-temperature feather yarn and a preparation method thereof. The preparation method comprises the following steps: introducing an impregnated nano material as a core material of the phase change microcapsule, forming a strong adhesion layer on the surface of the phase change microcapsule through dopamine auto-polymerization, carrying out in-situ reduction deposition of silver nanoparticles by taking the layer as a platform, and covalently grafting modified titanium dioxide nanoparticles through a silane coupling agent to obtain the phase change microcapsule. A firm composite photothermal conversion shell layer is constructed; and finally, weaving by a circular knitting machine to combine the functional core yarns with the conventional decorative yarns to form the feather yarns. According to the method, the integrity of the microcapsules can be kept in a processing environment, leakage of the phase-change material can be prevented, and meanwhile, combination of the photo-thermal layer and the phase-change microcapsules is realized, so that cooperation of wide-spectrum efficient photo-thermal conversion and heat energy storage and release is achieved, and the feather yarn is endowed with active and lasting intelligent temperature regulation performance.

This invention discloses a corrosion-resistant, self-cleaning, light-reflecting ceramic coating and its preparation method, belonging to the field of surface treatment technology. The coating solution is applied to a substrate material using a scraping method to form the corrosion-resistant, self-cleaning, light-reflecting ceramic coating. The coating solution includes silica sol, silane coupling agent, wetting agent, tetrafluoroethylene particles, formic acid, and titanium dioxide nanoparticles, with the titanium dioxide nanoparticles comprising 12 wt.%–30 wt.%. This light-reflecting ceramic coating is a high-performance coating that can be used as a cooling coating for buildings. It effectively improves the light reflectivity of the substrate, thereby significantly reducing surface temperature and heat radiation absorption. It is particularly suitable for thermal management of building exterior walls and windows, achieving excellent energy-saving and cooling effects.

The invention relates to a high-breathability optical metamaterial passive constant-temperature operation protective garment, and belongs to the technical field of protective garment preparation. According to the technical requirements, the inner layer of the protective clothing is a composite substrate layer, is woven by special-shaped cross-section fibers, is loaded with a phase change microcapsule which takes an alkane mixture as a core material and takes polymethyl methacrylate as a wall material, and is prepared by padding and finishing with a finishing liquid containing a hydrophilic organic silicon finishing agent; the outer layer is an optical regulation and control functional layer and is formed by spraying coating slurry containing waterborne polyurethane resin, titanium dioxide nanoparticles, silicon dioxide nanoparticles and modified mica filler on the surface of the substrate layer. The garment has the advantages that under the condition that external energy is not needed, the contradiction between heat dissipation and heat insulation of the human body in the high-temperature operation environment is solved in a cooperative mode, and meanwhile high breathability and comfort of the garment are guaranteed.

A membrane including an aluminum oxide ceramic support coated with a layer including graphene flakes and titanium dioxide nanoparticles. The titanium dioxide nanoparticles are dispersed on the graphene flakes, and the titanium dioxide nanoparticles dispersed on the graphene flakes are in the form of spherical particles. The spherical particles have a diameter of 1 micrometer (μm) to 15 μm and the graphene flakes have a longest dimension of 0.2 μm to 5 μm.

The invention discloses ultrasonic activated high-viscosity and high-flexibility piezoelectric hydrogel loaded with barium titanate nanoparticles as well as a preparation method and application thereof, and belongs to the technical field of implant preparation. Comprising the following steps: taking ethyl 2-(dimethylamino) acrylate and acrylic acid as substrates, and adding a cross-linking agent, an initiator and methoxy polyethylene glycol acrylate to prepare a nano cross-linking agent; and mixing the two monomers, water and barium titanate nanoparticles in an ice bath, adding an initiator and a nano cross-linking agent, and carrying out heating molding. The hydrogel prepared by the invention has high viscosity, high flexibility and stable ultrasonic activation piezoelectric property, can bear 60% compression deformation without fracture, and has good biocompatibility. The hydrogel can be used for preparing an implant material, can promote integration of an implant and surrounding tissues, and is remarkable in application value.

The application belongs to the technical field of water treatment, and particularly relates to a high-efficiency decoloring agent for printing and dyeing wastewater and a decoloring treatment method. A preparation method of the high-efficiency decoloring agent comprises the following steps: step (a), crushing and activating a magnetic zeolite to obtain an activated zeolite; step (b), modifying the activated zeolite to obtain a zinc-cobalt bimetallic modified zeolite matrix suspension; step (c), adding carbon-coated titanium dioxide nanoparticles into the zinc-cobalt bimetallic modified zeolite matrix suspension to obtain a zinc-cobalt bimetallic modified zeolite matrix loaded with the carbon-coated titanium dioxide nanoparticles; and step (d), performing surface in-situ polymerization grafting to obtain the high-efficiency decoloring agent for printing and dyeing wastewater. Through the synergistic effect of the zinc-cobalt bimetallic modified zeolite matrix, the pH-responsive polymer grafting layer and the carbon-coated titanium dioxide nanoparticles, and in combination with microwave-enhanced pretreatment and photocatalytic oxidation technology, the adsorption capacity and photocatalytic performance of the decoloring agent are significantly improved, and efficient recovery and recycling are realized.

The invention relates to the field of biosensing materials, and particularly discloses a composite material for detecting oxidative stress biomarkers in sweat, a preparation method of the composite material and application of the composite material in AD diagnosis. The composite material comprises a carbon nanotube substrate, molybdenum disulfide (MoS2-X) which grows on the surface of the carbon nanotube substrate and is subjected to oxidation treatment, and titanium dioxide nanoparticles compounded on the surface of the carbon nanotube substrate. The preparation method comprises the following steps: growing high-crystallinity MoS on CNTs through a hydrothermal reaction and high-temperature calcination, then carrying out oxidation treatment by using a hydrogen peroxide solution to introduce oxygen doping and surface defects, and finally compounding TiO nanoparticles through a secondary hydrothermal reaction. The composite material prepared by the invention has high conductivity, excellent biocompatibility and abundant catalytic active sites, can efficiently and specifically detect oxidative stress related biomarkers in sweat, and has high detection sensitivity and strong anti-interference capability. The composite material can be used for preparing a biosensor and is beneficial to early diagnosis of Alzheimer's disease.

The invention discloses a preparation method of an oil-water separation mesh film, which comprises the following steps: cleaning and silanizing a 304 stainless steel mesh to construct a covalent bonding interface layer; then, by taking the halloysite nanotube or the attapulgite nanorod as a carrier, growing anatase-phase titanium dioxide nanoparticles on the surface of the halloysite nanotube or the attapulgite nanorod in situ through a solvothermal method to obtain hybrid functional powder; the powder and a temporary binder are prepared into homogeneous slurry, the homogeneous slurry is coated on the interface layer through a pulling dip-coating process, stepped heat treatment is performed after drying, finally, a firm micro-nano rough structure coating is formed, a covalent bonding interface layer is constructed on the surface of a 304 stainless steel wire mesh by adopting a silane coupling agent, and the surface of the 304 stainless steel wire mesh is coated with a coating layer. Chemical bonds are formed through hydrolysis and condensation reaction of silane molecules, an interface bonding mechanism can be changed, and a full-inorganic bonding interface is resistant to high temperature and hydrolysis and provides high-density chemical anchoring points, so that the bonding strength between the functional coating and the substrate is improved.

The application belongs to the field of composite material preparation, and particularly relates to a passive cooling composite material and a preparation method thereof. The passive cooling composite material has the characteristics of low ultraviolet-visible-near-infrared transmittance and high mid-infrared radiation transmittance, and the cooling effect reaches 3.79 DEG C in outdoor direct sunlight cooling test. The composite material comprises a bottom film, an intermediate film layer and a passive cooling film layer arranged from bottom to top. The intermediate film layer is composed of the following raw materials: polyester chips, modified polyester, modified kaolin, vinyl bis-stearamide, calcium stearate and antioxidant. The passive cooling film layer is composed of the following raw materials: low-density polyethylene and modified titanium dioxide nanoparticles. The composite material prepared in the application shows good cooling effect, and provides a new idea for the preparation of radiation cooling materials and functional application in the textile field.

The application discloses a visible light dual-wavelength polarization multiplexing super surface hologram and a preparation method thereof, and relates to the technical field of micro-nano manufacturing. The super surface hologram comprises: a super atom array with a period of 450nm in x and y directions and a height of 800nm, which is formed based on a nano-imprinting technology; in the super atom array, all the super atoms are cuboid columnar structures, and the main bodies are composed of polymers doped with titanium dioxide nanoparticles; the size and position of each super atom are determined according to a GS algorithm; the GS algorithm is used for calculating phase information of a target image under corresponding wavelength polarized light; and the wavelength polarized light comprises X polarized light with a wavelength of 532nm and Y polarized light with a wavelength of 671nm. The application can solve the problems of long manufacturing process period, small scale and high cost of a traditional super surface device, and provides a new development idea for multi-color imaging technology based on super surface holography.

The application discloses a composite self-cleaning fiber membrane based on a friction nanogenerator and a preparation method thereof. The composite self-cleaning fiber membrane is composed of polyvinylidene fluoride nanofibers, single-walled carbon nanotubes and titanium dioxide nanoparticles. The single-walled carbon nanotubes are combined on the fiber filaments of the polyvinylidene fluoride nanofibers. The titanium dioxide nanoparticles are discretely attached to the surface of the fiber filaments of the polyvinylidene fluoride nanofibers. When serving as a friction layer of the friction nanogenerator, the composite self-cleaning fiber membrane can realize high electric output performance and ultraviolet light-driven self-cleaning function simultaneously, and effectively solves the performance attenuation problem caused by membrane pollution in an outdoor polluted environment.

The present application relates to the field of building technology, in particular to a kind of gas permeability wall material based on VOCs concentration control gas flow and its preparation method and application.Gas permeability wall material is prepared from the following components by weight fraction: activated carbon fiber 65-55 parts, silicon dioxide particles 5-15 parts, titanium dioxide nanoparticles 5-20 parts, silica sol (SiO2·H2O) 15-20 parts, nitrogen-doped visible light responsive titanium dioxide 20-30 μm coating, silica aerogel 20-30 μm coating and silica sol 2-3 mm coating.The present application realizes natural penetration by designing the gradient structure of porous composite material, utilizes the concentration difference of indoor and outdoor VOCs to drive directional diffusion of pollutants, and simultaneously has light permeability and structural stability.This material can be widely used in residential, commercial, educational, medical, hotel and other building types, can significantly improve indoor air quality, and especially creates a healthy, low-noise indoor environment for sleep.