34 results about "Tio2 coating" patented technology

The invention relates to the technical field of lithium ion batteries, in particular to a diaphragm material for a lithium battery and a preparation method of the diaphragm material. Comprising a base film and a modified nano TiO2 coating, the modified nano TiO2 coating is arranged on at least one side surface of the base film, and the modified nano TiO2 coating comprises the following raw materials in parts by weight: 55-80 parts of a modified nano TiO2 composite material, 8-24 parts of a binder and 2.5-7.5 parts of a dispersant; the modified nano TiO2 composite material is prepared by taking cellulose nanocrystals, lanthanum zirconate and rare earth praseodymium as modifiers and nano TiO2 as a raw material, the mass ratio of the cellulose nanocrystal to the lanthanum zirconate to the rare earth praseodymium is (1-5): (2-3): 1. By adding the modified nano TiO2 composite material and introducing nano particles into the diaphragm, a three-dimensional network structure is formed, the liquid absorption property and the ionic conductivity of the diaphragm are improved, and meanwhile, the diaphragm is high in air permeability and relatively good in mechanical property and ionic conductivity.

The invention discloses a self-cleaning device for a ballast water pipeline of a tropical scientific investigation ship, the self-cleaning device comprises the ballast water pipeline, a double-rod fixing device, rotation dampers, a screw rod and a rotary scraper, the screw rod is fixed and welded on the inner wall of the ballast water pipeline by the double-rod fixing device, the rotary scraper is fixed on the screw rod through thread engagement and limited by the rotation dampers on the two sides, and the rotary scraper is fixed on the ballast water pipeline. A silicon nitride ceramic shaft seal is arranged at the penetrating connector of the screw and the double-rod fixing device, the rotary scraper body is made of a metal alloy matrix, and the surface of the rotary scraper body is coated with an Al2O3-TiO2 coating. The invention further discloses a working principle of the self-cleaning device for the ballast water pipeline of the tropical scientific investigation ship. Aiming at the special requirements of the operation area of the tropical scientific investigation ship, the rotary scraper is driven by the kinetic energy of ballast water flow, a quickly growing biological membrane is efficiently removed through the centrifugal stripping and shearing stripping effects of the fluid, pollution of chemical cleaning to sensitive ecology such as coral reefs is avoided, and the pipeline blockage risk and the maintenance cost are reduced.

The invention discloses an aluminum electrolytic capacitor composite oxide film suitable for a hydrogen fuel cell and a preparation method, and belongs to the technical field of aluminum electrolytic capacitors. The preparation method comprises the following steps: sequentially carrying out surface cleaning, neutralization, formation and activation pretreatment on a high-purity aluminum foil to prepare a surface-activated Al2O3 base film; the preparation method comprises the following steps: selecting tetrabutyl titanate as a titanium source, mixing a solvent, a chelating agent and a hydrolytic agent according to a preset molar ratio, stirring, modifying with a coupling agent, and performing ultrasonic dispersion to prepare TiO2 sol; coating the TiO2 sol on the surface of the Al2O3 base film by adopting a dip-coating process to form a wet film; and the wet film is converted into an anatase type TiO2 coating through segmented sintering, and the Al2O3-TiO2 composite oxide film is obtained. The composite oxide film comprises an Al2O3 base film and an anatase type TiO2 coating which are sequentially compounded, and the interface is tightly combined without gaps. Through material compounding and process optimization, the composite oxide film has the characteristics of low dielectric loss, high breakdown voltage, high humidity resistance and vibration resistance, adapts to the harsh working condition of a hydrogen fuel cell, and improves the service life and stability of a capacitor.

An advanced air disinfection and purification system integrating a UVC chamber with TIR lens optics and photocatalytic oxidation using titanium dioxide (TiO2) with PTFE. The UVC chamber is designed to maximize germicidal efficiency through reflective surfaces and focused UVC light. The TiO2 coating on the chamber's interior surfaces generates reactive oxygen species upon exposure to UVC light, effectively degrading pathogens and pollutants. The system is adaptable for integration into existing HVAC systems or as a standalone unit, offering enhanced air quality with minimal maintenance.

The application relates to the field of coating materials, and discloses a pure titanium material coating sensor for detecting low-concentration ammonia gas as well as a preparation method and application of the sensor. The sensor comprises a pure titanium material, a micro-arc oxidation coating and an electrode; the micro-arc oxidation coating is arranged on the surface of the pure titanium material through micro-arc oxidation of a sodium silicate, sodium stannate trihydrate and zinc acetate electrolyte; and the electrode is arranged on the micro-arc oxidation coating. The SnO2 / TiO2 coating capable of being applied to the detection of low-concentration ammonia gas under a high-humidity environment is formed on the surface of the pure titanium material through micro-arc oxidation of the composite electrolyte of sodium silicate, zinc acetate and sodium stannate trihydrate; the electrode is arranged, and the oxygen adsorption-desorption principle is utilized for detection; compared with conventional gases, the sensor exhibits excellent sensitivity and selectivity to ammonia gas, and therefore can effectively, timely and simply detect ammonia gas.

A sanitizer has substrates which are coated with an optically-activated nanomaterial TiO2 coating for cleaning air which comes into contact with the surfaces of the coating. UV LED light sources are arranged to emit light to be incident on the surfaces to activate the coatings. There is a large surface for impingement of air on the coatings due to a grille arrangement of the substrates, and the LED-emitted UV light being incident at acute angles on the grille honeycomb structure.

The invention discloses silicon-germanium fluorescent powder prepared from germanium tetrafluoride and application of the silicon-germanium fluorescent powder in an LED (light-emitting diode), and relates to the technical field of luminescent materials. The general chemical formula of the silicon-germanium fluorescent powder is Ca2 (Si < 0.6 > Ge < 0.4 >) O4: xLa < 3 + >, yEr < 3 + >, zYb < 3 + > (at) ZrO2-TiO2, wherein x is in the range of 0.015 to 0.017; y is in the range of 0.003 to 0.005; and z ranges from 0.025 to 0.03. By introducing ytterbium ions, lanthanum ions and other ions and the ZrO2-TiO2 coating layer, the fluorescence lifetime, the thermal stability and the chroma stability of the silicon-germanium fluorescent powder are effectively improved; and the silane coupling agent KH-570 is used for surface modification and fluidized bed grading treatment, so that the fluorescence lifetime, the thermal stability, the chroma stability and the moisture resistance of the silicon-germanium fluorescent powder are further improved. Therefore, the silicon-germanium fluorescent powder disclosed by the invention has a wider application prospect in the LED.

The present invention discloses a method for preparing a Na2FePO4F@TiO2 heterostructure material using atomic layer deposition technology. The method combines atomic layer deposition technology with annealing technology. By adjusting the number of atomic layer deposition cycles and the annealing temperature, a Ti-substituted Na2FePO4F@TiO2 heterostructure material with controllable physical and chemical properties is prepared. A TiO2 coating layer with adjustable thickness and tight bonding is formed on the outer layer of the material. The microscale heterostructure formed by annealing effectively enhances the mechanical properties of the material and reduces direct contact between the material and the electrolyte, thereby suppressing the occurrence of possible side reactions. At the same time, the trace Ti substitution achieved in one step acts as an anchoring agent without almost changing the original crystal structure, effectively preventing structural deformation and reducing internal stress changes, effectively improving the mechanical properties and cyclic stability of the Na2FePO4F material.

The invention relates to the technical field of hydrogen storage materials, in particular to a magnesium hydride in-situ coated hydrogen storage material and a preparation method thereof. Comprising the following steps: putting magnesium powder into a ball-milling tank, and adding n-pentane, tetrabutyl titanate and a certain amount of ball-milling beads into the ball-milling tank; filling hydrogen into the ball-milling tank, and then mounting the ball-milling tank on a ball-milling device for ball-milling. After ball milling is finished, the ball milling tank is transferred into a glove box, the ball milling tank is opened and then placed on a heating device to be dried, then powder is collected, and the sample is named as MgH2-TiO2. The preparation process is simple, the composite material is prepared by innovatively adopting a one-step wet ball milling method, the energy consumption is low, and the pollution is small; an organic solvent added in the preparation process can greatly enhance the ball milling effect, uniform distribution of tetrabutyl titanate on an MgH2 matrix is facilitated, and a TiO2 coating layer generated in situ in the ball milling process optimizes the catalytic effect; the initial hydrogen desorption temperature of the composite hydrogen storage material synthesized by the method is 189 DEG C, and the hydrogen desorption amount reaches 5.74 wt%.

The invention discloses a fiber ceramic-based catalytic filter element for denitration of industrial flue gas and a preparation method of the fiber ceramic-based catalytic filter element, and belongs to the technical field of catalytic filter elements. According to the preparation method, firstly, a chelating agent is introduced in the preparation process of TiO2 sol to improve the dispersity and particle size uniformity of TiO2 nanoparticles, the chelating agent can effectively adjust the hydrolysis rate of butyl titanate by means of the strong coordination acting force of the chelating agent and titanium ions, and high-dispersity and small-particle-size TiO2 sol is constructed; then, the fiber ceramic base material is immersed in the TiO2 sol, a firm TiO2 coating is formed after calcination, the firm TiO2 coating serves as a carrier with a high specific surface area, and the binding force between the firm TiO2 coating and the base material is enhanced; the preparation method comprises the following steps: firstly, preparing a TiO2 coating, then dipping a solution containing vanadium and tungsten precursors onto the composite carrier, and calcining to form a main active component V2O5 and a cocatalyst WO3 which are highly dispersed on the surface of the TiO2 coating to form selective catalytic reduction active sites, thereby finally obtaining the fiber ceramic-based catalytic filter element which is good in blocking resistance, water-resistant, sulfur-resistant and high-temperature-resistant and can be used for industrial flue gas denitration.

The invention discloses a coating type denitration catalyst as well as a preparation method and application thereof. The coating type denitration catalyst comprises a honeycomb monolithic attapulgite carrier, the honeycomb monolithic attapulgite carrier is coated with a TiO2 coating, the TiO2 coating is loaded with an active component, and the mass of the TiO2 coating accounts for 1%-20% of the mass of the honeycomb monolithic attapulgite carrier. The loading capacity of the active component on the honeycomb integral attapulgite carrier coated with the TiO2 coating is not less than 10g / L; the active component is a combination of V2O5 and WO3 and / or MoO3. The carrier material of the coating type denitration catalyst is green and economical, industrial upgrading is promoted, the integral honeycomb attapulgite is adopted as the carrier, the coating type denitration catalyst has the advantages of being low in cost and environmentally friendly, and related industries are promoted to be upgraded towards the green and high-added-value direction.

This utility model relates to the field of lens technology and discloses a multi-point defocus lens, comprising: a base layer; a composite functional layer, including a reflective layer, an anti-fouling layer, and a wear-resistant layer arranged sequentially; and a defocusing structural layer, embedded in the base layer or the composite functional layer, including a honeycomb microlens array arranged in a honeycomb pattern, wherein the density of the honeycomb microlens array is ≥500 / cm². 2 The defocusing amount increases gradually from the center of the lens to the edge. Under ultraviolet light, the TiO2 coating in the anti-fouling layer can decompose more than 95% of organic stains (such as fingerprints and grease). After 1000 wiping tests, the light transmittance decreases. The nano-SiO2 coating has a hardness of 9H (pencil hardness) and excellent scratch resistance. Through plasma pretreatment, the composite functional layer has high adhesion to the base layer and is not prone to delamination even under large temperature differences. The composite layer solves problems such as anti-fouling and anti-scratch, and achieves synergy of multifunctional composite coating with excellent performance.

The application relates to the field of coating materials, and discloses a pure titanium material and a preparation method and application thereof. The surface of the pure titanium material is provided with a coating formed through micro-arc oxidation of an electrolyte of sodium silicate and zinc acetate, and an electrode with a connecting wire is arranged on the coating. The application carries out micro-arc oxidation through a composite electrolyte of sodium silicate and zinc acetate or sodium stannate, forms a ZnO / TiO2 coating capable of being applied to ammonia detection on the surface of the pure titanium material, detects through setting of the electrode and utilization of an oxygen adsorption-desorption principle, and the coating exhibits excellent sensitivity and selectivity to ammonia compared with conventional gases, so that the ammonia can be effectively, timely and simply detected.

This invention provides a plasma-sprayed graphene nanosheet-reinforced Al2O3-20wt%TiO2 coating and its preparation method, relating to the field of surface-protective functionalized coating preparation technology. The preparation method includes: combining graphene nanosheets with Al2O3-20wt%TiO2 ceramic powder to form a composite powder; and using a plasma spraying process, under specific process conditions, spraying the composite powder onto a pretreated substrate surface. Under this process, molten ceramic droplets can effectively coat the graphene nanosheets, forming a "ceramic-coated graphene" composite structure. The graphene nanosheets act as a reinforcing phase, synergistically improving the microhardness and fracture toughness of the coating. This invention solves the problem of traditional ceramic coatings being unable to simultaneously achieve both hardness and toughness, resulting in a coating with excellent overall performance.

This invention discloses a composite oxide film for aluminum electrolytic capacitors used in hydrogen fuel cells and its preparation method, belonging to the technical field of aluminum electrolytic capacitors. The preparation method includes: sequentially performing surface cleaning, neutralization, formation, and activation pretreatment on high-purity aluminum foil to prepare a surface-activated Al2O3 base film; selecting tetrabutyl titanate as the titanium source, mixing solvent, chelating agent, and hydrolyzing agent in a preset molar ratio, and preparing TiO2 sol through stirring, coupling agent modification, and ultrasonic dispersion; coating the TiO2 sol onto the surface of the Al2O3 base film using a dip-coating process to form a wet film; and transforming the wet film into anatase TiO2 coating through segmented sintering to obtain an Al2O3-TiO2 composite oxide film. The composite oxide film comprises a sequentially composited Al2O3 base film and anatase TiO2 coating, with a tight, gapless interface. This invention, through material composite and process optimization, enables the composite oxide film to possess low dielectric loss, high breakdown voltage, high humidity resistance, and vibration resistance, making it suitable for the harsh operating conditions of hydrogen fuel cells and improving the capacitor's service life and stability.

The invention discloses a tea space purification method based on purple sand-moss symbiosis. According to the invention, through the synergistic effect of physical adsorption, photocatalytic decomposition and biodegradation, a multi-dimensional pollutant treatment system is constructed. A multi-stage adsorption network is formed by the double-pore structure of the purple sand and the moss microporous blades; the TiO2 coating excited by the UV light source can decompose formaldehyde into harmless carbon dioxide and water, iron-rich minerals in the purple sand further improve the catalytic activity, the capillary pore structure of the purple sand and the water storage layer at the bottom automatically adjust the humidity through the siphonic effect, and the humidity of the tea bin can be stabilized within an ideal interval of about 65% in cooperation with the transpiration effect of moss. The tea leaves are inhibited from mildewing, and the influence of too high or too low humidity on the quality of tea products is avoided; the selected low-light-resistant pennisetum brachyides can keep a high survival rate in a common low-light environment in a tea space, so that the photocatalytic requirement is met, and the moss activity is prevented from being damaged.

This invention discloses a composite membrane-based stackable universal three-dimensional snail aquaculture device, relating to the field of aquaculture technology. It includes at least one aquaculture unit and a filter screen. The aquaculture unit comprises a transparent inverted U-shaped frame and a detachable base plate; the inverted U-shaped frame is connected to the detachable base plate; the interior of the inverted U-shaped frame has a permeable arc-shaped groove, forming through-channel openings at both ends of the aquaculture unit; a transparent nano-TiO2 coating is applied to the outer surface of the inverted U-shaped frame; a modified transparent polyester fiber composite membrane is adhered to the inner surface of the inverted U-shaped frame; the detachable base plate is made of frosted ABS board; the aquaculture units can be spliced ​​together in planar space and stacked vertically; the filter screen is used to seal the through-channel openings of the aquaculture units. This invention has a simple structure, requires no power, and is low-cost, combining three-dimensional aquaculture, water purification, natural feed enrichment, and rapid harvesting functions. It is highly versatile and suitable for efficient and green aquaculture of various snail species in multiple scenarios.

This invention relates to a method for enhancing the lifespan of coated titanium electrodes using a polymer-modified coating solution. Compared to electrodes prepared with conventional coating solutions without polymer modification, the electrode coating prepared with the polymer-modified solution exhibits a 20-50% reduction in crack size, a 0.8-2.4-fold increase in accelerated life testing lifespan, and a 1-2.5-fold increase in lifespan during frequent reverse electrolysis of tap water. The polymer-modified coating solution method is applicable to coated titanium electrodes with various active coatings, including but not limited to RuO2-TiO2 coatings, RuO2-TiO2-IrO2 coatings, RuO2-TiO2-SnO2 coatings, and IrO2-Ta2O5 coatings. Furthermore, the polymer-modified coating solution method is compatible with existing industrial electrode manufacturing processes, namely the surface coating thermal decomposition process, and is easily scaled up for production.

The invention discloses a Ni-doped / TiO2-coated synergistically modified manganese-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of volatile organic compound catalytic oxidation. According to the invention, based on a Ni-doped / TiO2 coating synergistic modification method, the Ni-doped / TiO2 coating synergistic modified manganese-based catalyst is obtained through a simple synthetic route. The catalyst has the advantages that materials are low in price and easy to obtain, the preparation method is simple, efficient, economical and feasible, requirements of used equipment and instruments are simple, and the yield is high. Compared with a traditional wet impregnation or single hydrothermal one-pot preparation method, the method has the advantages that accurate regulation, control and optimization of active sites of the catalyst are more effectively realized, and the surface acidity of the catalyst is optimized. Through TiO2 coating, the catalyst can effectively relieve carbon deposition and chlorine poisoning phenomena of active components.

This invention discloses a titanium dioxide-coated oxygen-defect-containing molybdenum trioxide material, its preparation method, and its applications. The titanium dioxide-coated oxygen-defect-containing molybdenum trioxide material (MoO) 3‑x The preparation method of TiO2 is as follows: First, TiO2 is coated onto the surface of MoO3 using tetrabutyl titanate as the titanium source. Then, low-carbon fatty alcohols such as methanol and ethanol are used as reducing agents to introduce oxygen vacancies. The TiO2 coating layer avoids the formation of oxygen vacancies on the surface of MoO3. 3‑x Contact with the electrolyte inhibits dissolution and confines MoO₂. 3‑x This allows it to maintain structural stability during repeated proton insertion / extraction processes. The introduction of oxygen vacancies can increase the interlayer spacing of MoO3 and improve the MoO2 content. 3‑x The conductivity of TiO2 promotes proton transport dynamics. Therefore, MoO 3‑x @TiO2, as a proton storage electrode material, combines high capacity, high rate capability, and good cycling stability.

The invention discloses a curved surface type inner surface heterogeneous hierarchical coating and a preparation method thereof, and the preparation method comprises the following steps: preparing a first Cr coating, a first CrN coating, a CrAlN coating, a second CrN coating and a second Cr coating on the surface of a matrix layer by layer to obtain a CrAlN composite transition layer; and preparing a TiO2 coating on the surface of the substrate plated with the Cr / Al / N composite transition layer. The CrAlN composite transition layer is introduced between the substrate and the surface coating, so that the residual stress is reduced, the composite transition layer has excellent high-temperature impact stripping resistance and coking resistance, the performance of the cylinder sleeve under extreme working conditions is effectively improved, and the service life of the cylinder sleeve under extreme working conditions is effectively prolonged.

The invention discloses an electric water heater with bathroom space odor removal and bacteriostasis functions, and relates to the technical field of electric water heaters. The electric water heater comprises an electric water heater body and an air purification module, and the air purification module is fixed to one side of the electric water heater. The air purification module comprises a controller, a reaction cavity, an ultraviolet light source and a fan, and the controller is connected with the ultraviolet light source and the fan. A honeycomb-shaped porous structure is arranged on the inner wall of the reaction cavity, a TiO2 coating is arranged on the inner wall of the reaction cavity, and the ultraviolet light source is arranged in the reaction cavity; an inlet is formed in one side of the reaction cavity, a filter screen is arranged at the inlet, an outlet is formed in the other side of the reaction cavity, and the fan is arranged at the outlet. The strong oxidizing capacity of hydroxyl free radicals is utilized, peculiar smell gas, volatile organic compounds and the like are effectively degraded, pathogenic bacteria can be fully inactivated, pollution and residues are avoided, and the air quality of the bathroom space is remarkably improved.

The invention discloses a positive electrode carbon-enhanced and negative electrode fully-carbonized electrode and a preparation process thereof, and relates to the technical field of energy storage, the positive electrode preparation process comprises a positive electrode preparation process and a negative electrode preparation process, the positive electrode preparation process comprises the following steps: 1, constructing a CNT conductive skeleton: taking a Pb-Ca-Sn alloy grid plate as a substrate, taking Fe and Al2O3 as a composite catalyst, and preparing the CNT conductive skeleton; cH4 and H2 gas are introduced for CVD growth to form a CNT conductive skeleton; and 2, PbO2 electro-deposition: taking a mixed solution of H2SO4 and Pb (NO3) 2 as an electrolyte for electro-deposition, and taking the CNT conductive skeleton as an anode. According to the positive electrode, PbO2 phase change is inhibited through the TiO2 coating layer, positive electrode PbO2 particle aggregation is reduced, and battery capacity attenuation is relieved; the negative electrode forms a surface functional group through N and S co-doping treatment, additional pseudocapacitance is provided, and the specific capacity of the all-carbon negative electrode is improved.

The invention provides a sol-gel preparation method and application of a TiO2-SiO2 photocatalyst, and relates to the technical field of photocatalysts.The preparation method comprises the following steps that ethyl silicate serves as a silicon source, absolute ethyl alcohol and deionized water serve as solvents, and a SiO2 colloidal crystal template is prepared under the catalytic action of ammonia water; the preparation method comprises the following steps: preparing a SiO2 colloidal crystal template, adding a mixed solution obtained by hydrolysis of butyl titanate and absolute ethyl alcohol into the SiO2 colloidal crystal template, and preparing the TiO2-SiO2 photocatalyst with a TiO2 coating loaded on SiO2 spheres by adopting a sol-gel preparation technology. According to the preparation method and the application thereof provided by the invention, the preparation process is relatively simple and convenient, the reaction is easy to carry out, the prepared SiO2 microspheres are relatively good in monodispersity, controllable in size and high in purity, uniform doping on a molecular level is easy to realize, and degradation of organic pollutants can be effectively realized.

The invention discloses a nanofiber self-cleaning anti-haze intelligent screen window with a physical adsorption function, and belongs to the technical field of air purification and intelligent buildings. The product adopts a gradient nanofiber filter layer constructed by a centrifugal spinning technology, and has graded filtration and electrostatic adsorption capacities on particulate matters with different particle sizes; the screen window is integrated with an ultraviolet light catalysis module, and low-energy-consumption self-cleaning is achieved through a TiO2 coating; the air quality sensor monitors the PM2.5 concentration or the light transmittance and triggers the UV irradiation cleaning action. The whole system is provided with an Internet of Things communication module, and the operation state can be remotely monitored in real time. The air purifier is simple in structure and high in filtering efficiency, has the advantages of environmental protection, self-cleaning, intelligent control and the like, and is suitable for indoor air purification scenes such as residential buildings, schools and hospitals.

This invention relates to a processing method for AR eyeglass lenses, belonging to the field of glass surface treatment technology. To address the problems of poor color difference and PV value in existing products, a processing method for AR eyeglass lenses is provided. The method includes placing the AR eyeglass lens to be coated in a vacuum coating chamber, first performing a titanium pentoxide (TiO2) coating to form a TiO2 coating layer one on the surface of the AR eyeglass lens; then performing a silicon dioxide coating to form a silicon dioxide coating layer one on the surface of the TiO2 coating layer one; repeating the TiO2 coating step A and the silicon dioxide coating step B, sequentially forming a TiO2 coating layer two, a silicon dioxide coating layer two, a TiO2 coating layer three, and a silicon dioxide coating layer three, until the coating process is complete, resulting in a coated AR eyeglass lens. This method enables the formed coating layers to have a low overall color difference value and a purple color effect, making it better suited for AR eyeglass lenses.

This utility model provides a composite material invisible screen assembly that resists ultraviolet radiation, belonging to the field of invisible screen technology. The assembly includes a top base; two connecting seats, each fixedly connected to the lower end of the top base, with a base fixedly connected to the lower end of each connecting seat, and multiple connecting posts fixedly connected to the upper end of the base; a rotating shaft rotatably connected to the inner walls of both sides of the top base, with a composite material invisible screen fixedly connected to the outer surface of the rotating shaft; the composite material invisible screen contains a nano-TiO2 coating and a polyester fiber substrate, thereby blocking ultraviolet rays and delaying screen aging. A double-locking mechanism ensures mechanical locking, preventing elasticity loss after repeated stretching and accidental screen retraction. An anti-accidental-touch design prevents external force from triggering unlocking.

The application discloses a high-selectivity gas sensor for NO2 gas detection at room temperature and a preparation method thereof, which comprises an electrode sheet and a black titanium dioxide sensing film uniformly loaded on the surface of the electrode sheet. TiO2 is added into a solvent to form a slurry, the slurry is uniformly drop-coated on the electrode sheet, then the electrode sheet is uniformly and slowly heated to remove the solvent, and the operation is repeated for multiple times, so that a TiO2 coating with a required thickness is formed on the surface of the electrode sheet; and the electrode sheet coated with the TiO2 coating is annealed in vacuum to form a black titanium dioxide sensing film on the surface of the electrode sheet. The black titanium dioxide sensing film has oxygen vacancies, and can realize detection of NO2 at room temperature, has high detection sensitivity, low detection limit and high selectivity, realizes rapid and efficient detection of NO2, has low detection cost, and is suitable for popularization and application.

The invention discloses a design and preparation method of a lotus seedpod type titanium alloy surface super-hydrophobic microstructure. The super-hydrophobic function is achieved by designing the lotus seedpod-shaped structures and the pit structures which are periodically arranged, and preparation is conducted through the femtosecond laser and the magnetron sputtering technology. The designed super-hydrophobic microstructure can present a good super-hydrophobic function, can effectively store air to form an air film layer, and realizes antibiosis by a physical isolation method, so that the bone implant obtains the ability of resisting bacterial adhesion and biofilm formation. And based on the lotus seedpod-shaped structure and pit composite structure characteristics, a mathematical equation is deduced in combination with a liquid drop infiltration model, characteristic parameters of the corresponding super-hydrophobic microstructure when the contact angle is larger than 150 degrees are determined, and super-hydrophobic microstructure design is completed. A Ti6Al4V titanium alloy material is selected for polishing pretreatment, a lotus seedpod-shaped structure and a pit structure are etched on the surface of the polished titanium alloy by utilizing the characteristics of femtosecond laser, and a TiO2 coating is deposited on the surface of the microstructure through magnetron sputtering, so that the preparation of the super-hydrophobic surface is realized. The design method provided by the invention can provide a systematic design theory and a realizable process scheme for surface functionalization of the bone implant.

The application discloses a micro-textured cutter with a TiO2 coating and a preparation method thereof, the cutter substrate material is a cemented carbide, multi-directional rhombic micro-textures are processed on a rake face, and the coating is a TiO2 coating with a nanometer thickness; the preparation method comprises the following steps: pre-treating the cemented carbide substrate, polishing the surface of the cemented carbide by using diamond sandpaper so that the surface is in a mirror state, processing multi-directional rhombic micro-textures on the surface of the cemented carbide cutter substrate by using a laser processing method, depositing a TiO2 coating on the textured surface by using an atomic layer deposition method, and performing annealing post-treatment on the coating in a nitrogen atmosphere. The micro-textures reduce the contact area between the cutter and chips, efficiently collect the chips and coating particles, and thus improve the friction condition in the cutting process. The cutter is suitable for cutting operations of low-hardness metal materials, prolongs the service life of the cutter, and improves the cutting machining efficiency.