80 results about "Tithonia longiradiata" patented technology

The invention provides a process for preparation of super-long titanium dioxide nano-tubes arrays, which is provided with catalytic performance. The process for preparation is that titanium or titanium alloys are utilized as anode after surface treatment. Ionic compound with halogen atoms is utilized as solutes, which is dissolved in anhydrous organic solvents to utilize as electrolyte. Platinum electrode is counter electrode. After anodizing and high-temperature annealing, TiO2 nano-tubes arrays of which length is at 30-190 mu m and diameter of tube is at 20-200nm can be achieved on titanium or titanium alloys. The combination of the super-long highly orderly titanium dioxide nano-tubes arrays and matrix, which is prepared by the invention, is more firmly than the combination of traditional titania film and matrix. Film thickness of the super-long highly orderly titanium dioxide nano-tubes arrays is at 30-190 mu m. Thickness which is at the range of the film thickness of the super-long highly orderly titanium dioxide nano-tubes arrays is provided with higher photoelectric conversion efficiencies, which is favorable to application of the super-long titanium dioxide nano-tubes arrays in the field of photocatalysis, solar cell, sensor and the like.

The invention relates to a rutile type titanium dioxide nanowire film and a preparation method and applications thereof. The preparation method of the film comprises the steps of directly growing rutile phase titanium dioxide nanowire array on a conductive glass substrate, and evenly distributing titanium dioxide nanowire clusters on the surface of the top end of the array; and regulating the proportion of various reactants, reaction time, temperature and other factors by taking sulfate radical-containing titanium slat as precursor for preparing the film. The invention further provides applications of the film, and the film can be used as anode materials to assemble a solar cell, or as photocatalyst to carry out water photolysis or organic matter degradation treatment. The method is simple, and has strong controllability, the problems that therutile phase is difficult to be prepared by using the sulfate radical-containing titanium slat and the titanium dioxide nanowire array grows on the conductive substrate in situ are solved, and the change on the diameter and length of the nanowire can be realized while the no change on crystallinity of a sample can be ensured through a calcination method.

The invention belongs to the technical field of photoelectrochemical sensors, and particularly relates to a carbon quantum dot-nanowire array-based cardiomyocyte signal molecule sensor based on sunlight drive and a preparation method thereof. The preparation method comprises the following steps: under a hydrothermal system, growing a titanium dioxide nanowire array on a conductive glass substrate; obtaining silane-functionalized nitrogen-doped carbon dots (N-CDots) at one step in situ through using a microwave method; then placing titanium dioxide nanowires processed by concentrated sulfuric acid into an N-CDot ethanol solution, adding stronger ammonia water, standing and reacting, and defining as N-CDot-TiO2. The photoelectric current of the N-CDot-TiO2 is improved by almost two times compared with that of pure TiO2, and the prepared photoelectric current on-off sensor can be used for dynamically detecting the content of H2S star molecules of cardiomyocytes in real time in situ. The carbon quantum dot-nanowire array-based cardiomyocyte signal molecule sensor is smart in design and wide in the source of raw materials, the preparation method is simple, environment-friendly, low in price, fast to response, wide in linear range, high in selectivity, and beneficial to popularization and application.

The invention provides a method for preparing a flexible electrode, wherein titanium dioxide nanorod arrays grow on a surface of a carbon fabric regarded as a substrate. The method comprises the following steps of: (1) putting the carbon fabric in a solution formed by mixing butyl titanate, hydrochloric acid and water, wherein the percent by volume of the butyl titanate is 4%-5%, the percent by volume of the hydrochloric acid is 41%-52%, and the balance is water; and (2) heating the carbon fabric contained mixed solution at a temperature of 170-200 DEG C for 40-60 minutes by adopting microwaves to obtain a titanium dioxide nanocrystalline electrode. Prior to the step (1), the method further comprises a cleaning step, in which the carbon fabric is subjected to ultrasonic processing for 30-60 minutes by respectively using acetone, water and ethanol. The method effectively solves the problems of infirm bonding between titanium dioxide granules and the substrate, and disordered growing in the conventional photoanode preparing process; for the first time, the titanium dioxide nanorod arrays evenly and firmly grow on the surface of the carbon fabric, and are synthesized once only; and the method is simple, has low cost for the reacting raw materials, is efficient and fast, thereby being favorable for popularization.

The invention discloses a method for growing titanium dioxide particles on a base material. The method includes the steps that 1, acid liquor and a titanium containing compound are mixed and stirred uniformly to obtain hydrothermal reaction liquid; 2, the base material is put in the hydrothermal reaction liquid, hydrothermal reaction is carried out at the temperature of 70-120 DEG C, and the titanium dioxide particles grow on the base material. The acid liquor is at least one of hydrochloric acid solution, nitric acid solution, sulfuric acid solution and hydrofluoric acid solution. The titanium containing compound is tetra-n-butyl titanate and/or isopropyl titanate. The size of the titanium containing compound accounts for 3-14% of the hydrothermal reaction liquid. The preparing method for growing the titanium dioxide particles on the base material is simple, the raw materials are easy to obtain, titanium dioxide firmly grows on the base material, and the crystal form and size of the titanium dioxide particles can be controlled to obtain high photocatalytic efficiency.

The invention in particular provides a high performance ultraviolet light detector made from an n-n homotype heterojunction material and formed by a titanium dioxide nanorod array and an n-type silicon substrate. A preparation method of the ultraviolet light detector comprises the following steps: growing a titanium dioxide nano dot film on the n-type silicon substrate by using a sputtering method; then inducing a seed layer to generate the titanium dioxide nanorod array by a water heating method; finally preparing a light transmitting metal layer electrode film by a magnetron sputtering method. The titanium dioxide nanorod array/silicon heterojunction ultraviolet light detector prepared by using the amplification effect of the titanium dioxide nanorod array/silicon heterojunction has the characteristics of being simple in process, low in cost, heater-free, capable of working under room temperature, low in energy consumption, high in sensitivity and short in response and restoration time, has good detection performance to ultraviolet light, and has important application prospect.

The invention relates to a positive/negative (P/N) heterojunction based silicon/titanium dioxide three-dimensional composite material with synergic anti-reflection performance. The silicon/titanium three-dimensional composite material is prepared according to the following method of (1) firstly, carrying out anisotropic etching on a silicon wafer with an alkali liquid, and forming a closely-arranged square conical shape on the surface of the silicon wafer; (2) secondly, carrying out hydrophilic treatment on the silicon wafer etched in the step (1), growing titanium dioxide crystal seed on the surface of the silicon wafer, and placing the silicon wafer in a muffle for calcination; and (3), finally, placing the silicon wafer with the titanium dioxide crystal seed on the surface, obtained in the step (2), in a reaction kettle, and obtaining the silicon/titanium dioxide three-dimensional composite material by adopting a hydrothermal method. The composite material disclosed by the invention is compatible with capabilities of excellent reflection elimination and high-efficiency photo-induced charge separation, and can be applied to the fields such as photocatalysis, a photoelectric conversion device and a solar cell.

The invention relates to a preparation method for a carbon fiber material with a composite nano structure. The preparation method comprises the following steps of: pretreating carbon fiber cloth, adhering a layer of thin iron film catalyst on the carbon fiber cloth by a liquid-phase method or a physical deposition method, in a chemical gas-phase reaction chamber, carrying out in-situ growth of carbon nanotubes on the carbon fiber cloth by using argon or nitrogen as a carrier gas, ethylene or acetylene gas as a carbon source gas, and hydrogen as a reducing gas, then carrying a gas containing titanium organism into the chemical gas-phase deposition reaction chamber through the carrier gas, growing titanium dioxide at the peripheries of the carbon nanotubes to form titanium dioxide nanoshells which wrap the carbon nanotubes, thus obtaining the carbon fiber material with the composite nano structure. The carbon fiber material obtained by the preparation method has the advantages of high mechanical strength, high thermal stability, good chemical inertness and high adsorption property, supernormal strength of carbon nanotubes, large length-diameter ratio, high thermal conductivity, good catalytic activity, high chemical stability, non-toxicity and super-hydrophilicity. The carbon fiber material with the composite nano structure can have important applications in photocatalysis, electrocatalysis and other aspects.

The invention discloses a preparation method for a carbon-coated super-long titanium dioxide nanotube negative electrode material of a lithium ion battery. The preparation method comprises the following steps of preparing a titanic acid nanotube by a hydrothermal method, and acidizing the titanic acid nanotube to obtain a hydrogen-based tube; dissolving the obtained hydrogen-based tube in ethanol, adding an organic macromolecular ethanol solution, and then carrying out low-temperature stirring to obtain macromolecular-coated hydrogen-based tube serving as a carbon-coated titanium dioxide nanotube precursor; and carrying out high-temperature thermal treatment on the precursor under the production of an inert gas to obtain the carbon uniformly-coated super-long titanium dioxide nanotube negative electrode material of the lithium ion battery. The preparation method has the advantages of simplicity in process, easiness in operation, material availability, low cost and environmental friendliness, no special device is needed in the whole reaction process, industrial production is promoted, and the quality of the finally-obtained product is relatively high; and with a high-conductive phase substance composite nano tubular structure prepared according to the method, the ion transmission distance can be shortened, the conductivity of the material and the ion diffusion rate of the material are improved, so that the material has excellent rate capability, stable cycle performance and high coulombic efficiency. The material prepared according to the method is an ideal lithium ion negative electrode material having wide commercial application prospect.

The invention provides a gold nanowire modified titanium dioxide nano pillar array SERS substrate material as well as a preparation method thereof and application thereof. The method comprises the following steps: taking conductive glass as a carrier to firstly grow a titanium dioxide nano pillar array on the surface of the conductive glass to obtain conductive glass loaded with a titanium dioxidenano pillar array film; soaking the conductive glass loaded with the titanium dioxide nano pillar array film into a mixed solution containing gold ions to perform hydrothermal reaction to deposit a gold nanowire, cleaning with deionized water and drying after the reaction is ended, thereby preparing the gold nanowire modified titanium dioxide nano pillar array SERS substrate material. The SERS substrate material prepared by the invention has relatively good SERS enhancing effect, also has good uniformity, stability and photocatalytic self-cleaning performance, and can be applied to analysis and detection of organic and inorganic biological molecules.

The invention relates to a silver nanoparticle modified titanium dioxide nanofiber membrane material as well as a preparation method and application thereof. The method comprises the steps of: growinga titanium dioxide nanofiber membrane on carbon paper serving as a carrier to obtain a titanium dioxide nanofiber membrane material; dissolving ethylene glycol in water to obtain an ethylene glycol solution, and then sequentially adding polyvinylpyrrolidone-K30, sodium borohydride and silver nitrate to the ethylene glycol solution to obtain a silver sol; and immersing the titanium dioxide nanofiber membrane material in the silver sol to obtain the silver nanoparticle modified titanium dioxide nanofiber membrane material. The silver nanoparticle modified titanium dioxide nanofiber membrane material prepared by the invention has good filtering, photocatalytic self-cleaning and surface enhanced Raman scattering detection functions on positively charged organic molecules.

The invention provides a method for preparing a near-infrared responsive functional coating on the surface of a cylindrical titanium nail. The method for preparing the near-infrared responsive functional coating on the surface of the cylindrical titanium nail comprises the following steps that the titanium nail is pretreated; a titanium dioxide nanotube is grown on the titanium nails: the treatedtitanium nail is placed into an electrolyte and connected to an anode, a cathode is connected with a custom tubular graphite electrode, the reaction voltage is 40V, the reaction is carried out at roomtemperature for 3h, the ethanol is dried after ultrasonication, and the mixture is calcined at 450 DEG C for 2h to obtain titanium nail/TNT; gold nanoparticles and carbon quantum dots are synthesized; the gold nanoparticles and the carbon quantum dots are loaded onto the titanium titan nanotube on the surface of the titanium nail to obtain titanium nails/TNT/AU/CQDS. The titanium dioxide nanotubeloaded with the gold nanoparticles and the carbon quantum dots on the surface of the cylindrical titanium nail can be prepared by the method, and the obtained titanium nail with functional coating has good photothermal effect and generates active oxygen after being irradiated for 15 minutes by infrared rays at 808 nm, and both staphylococcus aureus and escherichia coli have better antibacterial effects, as well as good cell compatibility and osteogenic properties.

The invention relates to a tetragonal-phase barium titanate nanorod array and a preparation method thereof. In order to overcome the defects that no tetragonal-phase barium titanate nanorod arrays exist in the prior art and the crystal structure of barium titanate material can be changed into a tetragonal phase from a cubic phase only by high-temperature calcining, the invention provides a tetragonal-phase barium titanate nanorod array. The single nanorod has single crystal structure, the length of the single nanorod is 200nm-10mum, and the diameter is 50-250nm. The invention also provides a method for preparing the tetragonal-phase barium titanate nanorod array, comprising: growing a titanium dioxide nanorod array is grown on fluorin-doped stannic oxide conductive glass by hydrothermal reaction; and carrying out secondary hydrothermal reaction to convert the titanium dioxide nanorod array into the barium titanate nanorod array in the invention. The method has the advantages of simple step and high repeatability and can be used for regulating and controlling the diameter and length of the barium titanate nanorod by regulating concentration, temperature and time.

The invention specifically provides a high-performance hydrogen detector, which takes a silicon dioxide-covered silicon wafer as a substrate, takes a titanium dioxide semiconductor as a base material, and takes palladium as a catalytic layer. First, a titanium dioxide film is grown on the silicon dioxide-covered silicon substrate by utilizing a radio frequency magnetron sputtering method; and then, a palladium catalytic layer of which the area is smaller than that of the titanium dioxide film is prepared on the film surface by a mask and a direct-current magnetron sputtering method. A palladium/titanium dioxide/silicon dioxide/silicon heterojunction-based hydrogen detector which is disclosed by the invention and utilizes the catalytic effect of the palladium film and the amplification effect of a titanium dioxide/silicon dioxide/silicon heterojunction is simple in process and low in cost, does not need a heater, can work at room temperature, has the characteristics of high sensitivity and short response and recover time, has good detection performance on hydrogen and has an important application prospect.

The invention discloses a super-thin-wall honeycomb-shaped structure titanium dioxide nano material and a preparation method thereof. The super-thin-wall honeycomb-shaped structure titanium dioxide nano material is of a relatively uniform layered structure, the thickness of a nanosheet is relatively small, gaps are formed among layered nanosheets, specific surface areas, specific surface energy, flame retardancy, conductivity, heat conduction coefficients, impact strength and electron migration capabilities can be remarkably improved, according to the preparation method, a titanium dioxide film layer grows from titanium dioxide gel on the surface of a carbon fiber substrate and a two-dimensional titanium dioxide nano structure layer of which the gap sizes and morphology can be controlled is prepared on a titanium dioxide nano seed layer, defects that a conventional nanosheet is relatively low in generation rate, large in thickness, complex in process and the like can be overcome, the production process is simple, reaction conditions are gentle, the preparation time is short, and further, the industrial application of a titanium dioxide nano-structure material can be accelerated.

The invention discloses a preparation method of a polyetherimide (PEI) photocatalytic ultrafiltration membrane loaded with a titanium dioxide nanowire on a surface. The method comprises the followingsteps: 1) preparing PEI membrane making liquid: uniformly dissolving PEI and P25 into an NMP solution; 2) performing rotary coating and rubber rejection: making the membrane making liquid into a PEI/P25 composite membrane, and soaking a glass plate on which the membrane making liquid is poured into deionized water; 3) performing surface roughness treatment on the PEI/P25 membrane; 4) preparing hydrogen peroxide reaction liquid; 5) soaking the PEI/P25 composite membrane into the hydrogen peroxide reaction liquid to generate and cover a hydrogen titanate nanowire on the surface; 6) soaking the PEI/P25 membrane covered with the hydrogen titanate nanowire on the surface into hot water, converting and crystallizing the hydrogen titanate nanowire into titanium dioxide, and taking out and washingtitanium dioxide by using water. According to the preparation method disclosed by the invention, through a low-temperature crystallization technique, a titanium dioxide nanowire is grown on the surface of the PEI membrane, so that the hydrophilicity of the membrane is improved, and the membrane flux is improved while high truncation ratio is maintained at the same time. The membrane can be applied to the fields of photocatalytic pollution treatment and the like.

The invention relates to a method for preparing a titanium dioxide nano-array film grown in situ on a metal surface, comprising the following steps: (1) preparing a treatment solution: mixing hydrochloric acid and an inorganic titanium salt to obtain a precursor solution, and then adding alcohol to the precursor solution, Mix well and evenly to make a treatment solution, the molar concentration of titanium ions in the treatment solution is 0.01-0.08mol/L; (2) deposition treatment of titanium dioxide nano-array film: the metal substrate and the treatment solution are placed in the container at the same time, React at 150-200° C. for 1-6 hours, take out the substrate after the reaction, and wash with deionized water to obtain a titanium dioxide nano-array film on the surface of the substrate. The preparation method of the invention is simple, the reaction repeatability is good, and the film can be directly prepared on the surface of the irregular metal substrate, and the film has good biological activity.

The invention discloses a preparation method for a super-long titanium dioxide nanowire, belonging to the technical field of preparation of a nano material. The preparation method is characterized by comprising the following steps of: selecting a highly-dispersed titanium dioxide P25 generated by an AEROSL process, enabling the titanium dioxide P25 to react with sodium hydroxide, placing a solution in a reaction kettle, carrying out mechanical stirring on the reaction kettle, and leading the ultra-fine and super-long titanium dioxide nanowire to grow by a mechanical external force. The preparation method has the advantages that the length of the titanium dioxide nanowire prepared according to the method is between 10 micrometers and 15 micrometers, and the titanium dioxide nanowire has higher specific surface area and higher absorption ability.

The invention discloses a preparation method of an in-situ vertically grown titanium dioxide nanosheet film. The film is composed of vertically grown and uniformly distributed nanosheets, and is firmly bonded with a substrate; and the film is endowed with superhydrophilicity without ultraviolet irradiation and can be applied to occasions of sewage catalyzing and degrading treatment, indoor odor catalyzing and degrading treatment and the like.

The invention provides a preparation method for in-situ growth of a titanium dioxide nanowire on a Ti plate. According to the invention, a nanometer porous gold film is used as a catalyst; nanometer sol particles are used as seeds and enriched on the surface of a porous structure; an organic matter is used as a guiding agent; and the one-dimensional nanowire grows from bottom to top. A TiO2 crystal nucleus is preferential formed at the location of the seeds and then achieves gradual preferred growth under the guiding of the guiding agent. The preparation method is simple, is convenient to operate, and avoids the complicated procedures of necessary filtering, drying and heat treatment before obtainment of the titanium dioxide nanowire in a hydrothermal method, which enables the problem of agglomeration in filtering and heat treatment to be overcome and dispersibility of the titanium dioxide nanowire to be improved, thereby further improving the specific surface area and catalytic activity of the titanium dioxide nanowire.

The invention provides a preparation method of a carbon nitrogen/titanium dioxide composite material. The method comprises the following steps: mixing carbon nitride, titanous salt, oxydol and an anionic surfactant in water, and heating to react to obtain an intermediate product; and calcining the intermediate product in a protective atmosphere to obtain the carbon nitrogen/titanium dioxide composite material. Compared with the prior art, the titanium dioxide nanoparticles are grown on the carbon nitride in situ and calcinedin the protective atmosphere to convert the crystal form, so that the prepared carbon nitrogen/titanium dioxide composite material can be used as a photoelectric material for determining the antioxidant capacity of the antioxidant.

A titanium dioxide membrane electrode growing in place is provided, which relates to a preparation method for titanium dioxide membrane electrode. The invention solves the problems of high cost in the prior preparation method for titanium dioxide membrane electrode and weak bonding force of the prepared titanium dioxide membrane and the substrate. The titanium dioxide membrane electrode provided in the invention can be prepared through steps as follows: first, preprocessing to titanium sheet; second, energizing; third, baking and sensitizing, by which the titanium dioxide membrane electrode growing in place can be produced. The titanium dioxide membrane electrode prepared by the invention has the advantages of low cost and strong bonding force of the titanium dioxide membrane and the substrate.

The invention discloses a photocatalyst and application thereof to efficient photocatalysis degradation on different gas phase organic contaminants. The photocatalyst is a composite material obtainedthrough in situ growth of titanium dioxide onto kieselguhr. A preparation method comprises the following step that with titanium tetrachloride as a titanium source, porous kieselguhr as a carrier, andabsolute ethyl alcohol as a solvent, a one-step hydrothermal method is performed to prepare the photocatalyst. When the photocatalyst is applied to the treatment of different gas phase organic contaminants, the photocatalysis efficiency is high; the process is simple; the cost is low; the problem of secondary pollution is solved. A series of problems of a conventional catalyst such as poor adsorption capability on the organic contaminants, low catalysis activity, unthorough and difficult gas degradation and residue of organic contaminants which are difficult to solve in the prior art are solved by the invention. The product has potential application values in directions of photocatalysis application, gas phase organic contaminant treatment, environment optimization, particularly indoor gas phase organic contaminant treatment and the like; the photocatalyst is hopeful to realize industrial production and to be applied to life environment.

The invention provides a method for preparing a line supercapacitor electrode. The method comprises the steps that 1, cellulose nanofibers are prepared; 2, super long titanium dioxide nanotubes are prepared; 3, a solution obtained by conducting ternary complexing on the cellulose nanofibers, the super long titanium dioxide nanotubes and multiwalled carbon nanotubes is prepared; 4, a line supercapacitor electrode material is prepared. The method has the advantages that the average diameter of the cellulose nanofibers ranges from 30 nm to 50 nm, the length-diameter ratio of the cellulose nanofibers exceeds 1,000; the average diameter of the super long titanium dioxide nanotubes ranges from 40 nm to 80 nm, and the length-diameter ratio of the super long titanium dioxide nanotubes exceeds 800; the cellulose nanofibers, the super long titanium dioxide nanotubes, the multiwalled carbon nanotubes and graphene achieve a network-interpenetrated interlaced system; the line electrode is formed at a time; the electrochemical properties that the area-ratio capacitance is 62.5 mF/cm<2> when scanning is conduced at 10 mV/s, and the capacitance retention rate is 95% after charging and discharge are cycled 1,000 times at the current density of 0.5 mA/cm<2> are achieved.

The invention relates to a preparation method and application of a self-cleaning type titanium dioxide nano-fiber membrane material. The method comprises the following steps: adding a titanium sourceinto a reaction container; while stirring, adding absolute ethyl alcohol; then adding glacial acetic acid and continuously stirring at room temperature until a reaction solution is milky white, so asto obtain titanium dioxide sol; immersing carbon paper into the titanium dioxide sol and adsorbing titanium dioxide nanoparticles on the surface of the carbon paper, so as to obtain carbon paper loaded with the titanium dioxide nanoparticles; putting the obtained carbon paper into a sodium hydroxide solution and carrying out hydrothermal reaction; forming titanium dioxide nano-fibers on the surface of the carbon paper and carrying out self-assembling to obtain the titanium dioxide nano-fiber membrane material. The self-cleaning type titanium dioxide nano-fiber membrane material prepared by thepreparation method has good filtering performance on organic molecules and nanoparticles with positive charges.