2021results about How to "Not easy to reunite" patented technology

The embodiment of the invention discloses a graphene composite material and a preparation method thereof. In the method, graphene and organosilane are taken as reactants; the organosilane undergoes a hydrolysis reaction, and then undergoes a dehydration condensation reaction with hydroxyl on the graphene so as to obtain organosilane-modified graphene. Compared with the prior art, the organosilane-modified graphene expands the interlayer spacing of graphene, so that the organosilane-modified graphene is difficultly agglomerated when the organosilane-modified graphene is mixed with a polymer, the organosilane-modified graphene is uniformly dispersed in a polymer substrate, and a prepared graphene composite material has an enhanced effect. Moreover, the organosilane-modified graphene undergoes chemical bonding or intermolecular force with the polymer, so that the prepared graphene composite material has excellent interface compatibility. Proved by experiment results, the graphene composite material prepared in the invention has high mechanical property.

The invention belongs to the field of preparation techniques of nanophase materials and green energy resources, and relates to a preparation method of a nano positive material LiNi1 / 3Mn1 / 3Co1 / 3O2 applied to a lithium ion battery. By using the method, the defects that the calcining temperature needed by a current synthetic material is high, the calcining time is long, the particle sizes of a product are not uniform, and the like, are mainly solved. The preparation method comprises the following steps: adding a certain amount of template agent in a mixed aqueous solution of a nickel salt, a manganese salt and a cobalt salt, and then, dripping a precipitant and a complexing agent into the obtained mixture to form a precipitate; subjecting the precipitate and the mixed aqueous solution to a high-pressure thermal reaction in a hydrothermal kettle, cleaning and baking the obtained product to be dry, so as to obtain a nickel manganese cobalt oxide; and finally, uniformly mixing the nickel manganese cobalt oxide with the lithium salt to prepare a final product by calcining and cooling. By using the preparation method, the product with favorable electrochemical performance can be obtained within a shorter calcining time; the energy consumption is decreased; and the preparation method has obvious economic benefit in the large-scale application of industrial synthesis.

The invention relates to a multifunctional inorganic diatom ooze coating, which is prepared from the following components in percentage by mass: 10%-25% of water, 0.4%-0.8% of cellulose, 10-30% of a mixture of potassium metasilicate and silica sol, 0.2%-0.4% of a stabilizer, 0.1%-0.3% of a dispersing agent, 0.1%-0.3% of a silicon additive, 0.3%-0.5% of a defoaming agent, 0.1%-0.3% of an antibacterial agent, 0-20% of titanium dioxide, 5%-15% of nanometer kieselguhr, 10%-30% of coarse whiting, 2%-4% of talcum powder, 1%-3% of medical stone, 0-1.5% of anion, 0-2% of a nano-photocatalyst, 1%-2% of inorganic gel powder, 0-9% of an order-removing emulsion and 0-1.5% of pigment, wherein the sum of the components is 100%. The invention also provides a preparation method of the coating. The coating disclosed by the invention has the functions of sterilizing, preventing mold, purifying air and the like; and the preparation method disclosed by the invention is simple and easy to operate.

The invention discloses graphene based conductive ink, comprising 2-25 wt% of conductive component, 5-25 wt% of bonding agent, 0.1-5 wt% of additive, 0.1-2 wt% of pH (Potential of Hydrogen) adjusting agent and the balance of solvent. A preparation method comprises the following steps of: dispersing the pH adjusting agent into the solvent to obtain a uniform first mixed liquid; mixing the first mixed liquid with the bonding agent to obtain a second mixed liquid; and mixing the second mixed liquid with the conductive component and the additive to obtain the graphene based conductive ink. The invention further provides a flexible conductive thin film prepared from the conductive ink. The conductive ink disclosed by the invention has the advantages of good dispersity, good conductive effect, easiness for printing, and cheap price. Furthermore, the flexible conductive thin film prepared from the conductive ink disclosed by the invention has good conductive performance.

The invention relates to a graphene / rare earth oxide nanometer composite material and a preparation method and application thereof. The preparation method comprises the following steps of: uniformly mixing oxidized graphene dispersion liquid and a soluble rare earth compound at the weight ratio of (1:1)-(1:10), regulating a pH value to alkalescence, and carrying out hydrothermal reaction to obtain the graphene-rare earth oxide nanometer composite material; and uniformly mixing the oxidized graphene dispersion liquid and the soluble rare earth compound at the weight ratio of (1:1)-(1:10), adding a reducer, and carrying out reflux reaction at certain temperature to obtain the graphene-rare earth oxide nanometer composite material. According to the invention, rare earth oxides are successfully loaded to the surface of graphene, the rare earth oxides can be connected in a physical loading or chemical bonding way because of the electrostatic action of the surface of the oxidized graphene and uniformly dispersed to the surface of a nanometer graphene sheet by being formed into nanometer level particles, the particle size is 5-50 nanometers, and the sheet thickness is 1-5 layers, so that the agglomeration phenomena of the graphene is obviously improved, and the electrochemical property of the graphene nanometer composite material as a cathode material and the circulation stability of the graphene nanometer composite material in the charge-discharge process are effectively enhanced and superior to those the cathode of the traditional commercial lithium ion battery. The preparation method disclosed by the invention has the advantages of simple process, low cost, short period, and the like.

The invention relates to a preparation method and a catalytic application of a supported noble metal catalyst. Active components are noble metals Ru, Rh and Pd, and a carrier is MxOy or perovskite MAlO3 or spinel MAl2O4. The composite oxide carrier is prepared by an impregnation method or a coprecipitation method and is roasted under a medium-high temperature condition of 650-1200 DEG C ultimately, so that while the formed MxOy, MAlO3 or MAl2O4 or even a mixture thereof has a closer effect with an Al2O3 carrier, the number of defects and holes on the surface of Al2O3 is greatly increased, and thus prepared noble metal nanoparticles have high dispersion degree and strong stability. The catalyst preparation method has the advantages of simple operation, convenience for production and application, good product repeatability, high activity in a carbon dioxide methanation reaction and a carbon monoxide oxidation reaction, strong stability in a storage state and reaction, and quite good application prospects.

The invention discloses a molybdenum disulfide / carbon composite material. The molybdenum disulfide / carbon composite material comprises a molybdenum disulfide layer and a carbon hollow ball, wherein the molybdenum disulfide layer is positioned outside the carbon hollow ball; and the carbon hollow ball has a hollow structure. The invention also discloses a preparation method of the molybdenum disulfide / carbon composite material. The preparation method comprises the following steps of using amino modified silica spheres as a template; wrapping the template by pyrolyzation of an organic carbon source; performing thermal reaction on the template and ammonium tetrathiomolybdate through solvent; performing high-temperature carbonization in an inert atmosphere; and removing the silicon oxide template to obtain the molybdenum disulfide / carbon composite material. The lithium-intercalation capacity of the molybdenum disulfide / carbon composite material is 1467mAh / g for the first time, and the specific capacity of the molybdenum disulfide / carbon composite material can be kept at 733mAh / g after 30 times of repeated charging and discharging cycles.

The invention discloses electrocatalyst of MOFs (Metal-organic Frameworks) / graphene composite carrier and a preparation method of the electrocatalyst. The electrocatalyst is composed of the MOFs / graphene composite carrier and an active component. The preparation method of the MOFs / graphene composite carrier comprises the following steps of: preparing MOFs / graphene composite carrier through a hydrothermal reaction method; and loading the active component on the composite carrier by adopting a microwave synthesis method. The preparation method disclosed by the invention is simple in preparation steps, short in time and small in product loss; and the prepared catalyst is small in grain size, unlikely to cluster, uniformly distributed and high in electrochemical catalytic activity.

The invention discloses a quantum dot / acrylate polymer nanocrystal complex, a preparation method of the quantum dot / acrylate polymer nanocrystal complex, and a colored conversion coating, wherein the quantum dot / acrylate polymer nanocrystal complex is prepared by virtue of electrostatic interaction between an annion acrylate polymer and quantum dots with opposite charges. According to the invention, the quantum dots are pre-dispersed into the acrylate polymer, so as to prepare quantum dot / acrylate polymer nanocrystal complex. By virtue of similar composition of an acrylate polymer protection layer and acrylics as well as an acrylics modified photoresist resin matrix, the quantum dots can be easily dispersed into photoresist, are not easy to separate and are uniformly dispersed without aggregation, and thus the photoluminescent characteristic of the quantum dots is ensured. After the colored conversion coating prepared from the quantum dot / acrylate polymer nanocrystal complex is applied to a display, the colors of sub-pixel units of R / G / B colors corresponding to the colored conversion coating are relatively pure and have the relatively high saturability, energy of a backlight is sufficiently utilized, and the luminous efficiency is relatively high.

The present invention provides a flaky structure layered composite hydroxide and a preparation method thereof. According to the preparation method, a metal hydroxide, an oxide, a basic carbonate, a metal soluble salt and an alkali are adopted as raw materials, the addition speed of the alkali solution is controlled to prepare the flaky LDH, and the space confinement effect of the metal hydroxide, the oxide or the basic carbonate exists, such that the produced LDH flakes do not easily aggregate so as to finally obtain the LDH with a large specific surface, wherein the BET specific surface area is 130-200 m<2> / g and is much larger than the specific surface area of the ordinary LDH. According to the invention, the preparation method has characteristics of simpleness, no requirement of high temperature, high pressure and special equipment, rich raw material source and low cost; and the flaky structure layered composite hydroxide can be widely used in the fields of absorption separation, catalysis, polymer materials and the like.

The invention provides a method for preparing magnetic ferroferric oxide / conductive polyaniline light-weight composite hollow microspheres, which relates to a method for preparing a magnetic ferroferric oxide / conductive polyaniline composite material. The invention solves the problems of high density and easy agglomeration of the traditional magnetic nanometer particle / conductive polymer composite material. The method comprises the following steps of: regulating ferrous chloride and ferric chloride solutions to be alkaline, adding sodium dodecyl benzene sulfonate and reacting to obtain ferroferric oxide; and modifying hollow glass microspheres by using poly(diallyldimethylammonium chloride) solutions after alkaline cleaning, then reacting the hollow glass microspheres with the ferroferric oxide, sequentially immersing obtained solid particles by using the poly(diallyldimethylammonium chloride) solutions and polystyrene sulfonic acid solutions, then adding the solid particles to aniline solutions, initiating polymerization by using ammonium persulfate, and washing and drying the solid particles to obtain the composite hollow microspheres. The composite hollow microspheres have both conductivity and magnetism, the density is 0.78-0.8g / cm<3>, and the composite hollow microspheres are not easy to agglomerate and are used for fields of military equipment stealth technology and civil anti-electromagnetic radiation.

The invention relates to a carbon fiber supported metal catalyst as well as a preparation method and an application thereof. The materials such as graphene nano belt, a multi-arm carbon nano tube and graphene are adopted as graphitization template-based additives, and composite carbon fiber with high graphitization degree and high conductivity is obtained by electrostatic spinning and wet spinning processes and a high-temperature carbonization process, wherein the preferential amount of the template-based additives is 0.5-5% by weight; the high-graphitization composite carbon fiber is used as a carrier of the catalyst, and a metal / carbon nano fiber catalyst for a fuel cell is obtained by reduction; the catalyst has a large initial electrochemical-activity surface area and strong CO toxicity resistance; the current density attenuation is reduced in a 30 minutes of chronoamperometry test, and the catalyst shows higher electrochemical activity, higher current density and better electrochemical stability; and moreover, the catalyst taking the high-graphitization carbon fiber as a carrier shows remarkably high durability.

The invention belongs to the technical field of materials, and particularly relates to a preparation method of graphene with nano ferroferric oxide precipitated on surface, which concretely comprises the steps of: firstly, oxidizing natural flake graphite and obtaining graphite oxide; further carrying out ultrasonic stripping on the graphite oxide and forming graphene oxide suspension; then, carrying out reduction reaction on the graphene oxide suspension under the action of strong reducing agent, and obtaining black flocculent flake graphene; and finally, taking hydrogen peroxide as an oxidant, and depositing Fe3O4 on the surface of the graphene in an alkaline solution. The invention realizes the modification of nanoscale Fe3O4 for the surface of the graphene. The obtained modified graphene is not doped with other elements except the Fe element, and can be well dispersed in a high-performance resin matrix, so that the mechanical property, the thermal performance, the electromagnetic performance and the friction property of the resin matrix can be improved, and phenolic resin, bismaleimide, cyanate ester and other products can be updated, or a new application field can be developed..

The invention relates to a method for modifying a boron nitride nanosheet with polydopamine. The invention aims to provide a method of using a mixed solvent of a polar organic solvent and water to conduct ultrasonic stripping of hexagonal boron nitride and modifying a boron nitride nanosheet surface with polydopamine. The boron nitride nanosheet obtained by the method provided by the invention has the characteristics of good dispersibility in the mixed solvent of the polar organic solvent and water, high yield and long storage time. The polydopamine surface modified boron nitride nanosheet prepared by the method has easy storage properties and good dispersibility in a solvent. The method for modifying a boron nitride nanosheet with polydopamine provided by the invention has the advantages of simple operation, safety and low cost, etc.

The invention provides a method for preparing a magnetic active carbon composite material for water treatment in the technical field of environmental purification. The method comprises the following steps: mixing active carbon and corresponding metal salt solution, and generating magnetic nano granules in pore canals of the active carbon in situ by using the characteristics of instantaneous high temperature, high pressure, high cooling speed and the like generated by ultrasonic waves; and filtering and drying the obtained compound, and treating the compound at high temperature to form the magnetic active carbon composite material, wherein the magnetic material accounts for 15 to 50 percent in the whole material in terms of weight percentage, and the active carbon material accounts for 85 to 50 percent. The invention provides a new method for generating magnetic nano particles in the pore canals of the active carbon; and the prepared magnetic active carbon keeps larger specific surface area, reserves the open pore canals from the active carbon, removes organic substances and inorganic heavy metal ions in water treatment, and is easy for magnetic separation and convenient to recover.

The invention discloses a Co3O4 nanometer material for a supercapacitor and a preparation method thereof. The method comprises the following steps: on the basis of using cobalt nitrate as a raw material and a mixture of ethylene glycol and water as a solvent, adding a defined amount of glucose, placing the mixture in an autoclave to react at 120-200 DEG C for 10-25 hours, performing suction filtering, drying at 80 DEG C, calcining in a muffle furnace at 300 DEG C to obtain Co3O4 sea urchin-shaped conjoined spheres which have the diameter of 7-15mu m and are of a three-dimensional hierarchical structure. The Co3O4 nanometer material and the preparation method have the characteristics that the operation method is simple, the yield is high, and the product has the three-dimensional hierarchical structure and superior electrochemical performance. The prepared Co3O4 spheres with the three-dimensional hierarchical structure have the characteristics that the stability is higher, the particle size distribution is uniform, the dispersibility is good, the spheres are difficult in agglomeration and pores with the three-dimensional structure are beneficial to the diffusion of the electrolyte, thus the material can be widely applied in the fields of catalysis, lithium batteries and supercapacitors.

The invention discloses a hydrophilic modification method of a PVDF ultrafilter membrane by the utilization of nano-TiO2 sol and belongs to the field of membrane separation technologies. According to the method, PVDF is used as the main high-molecular membrane preparation material. The hydrophilic TiO2 sol prepared in advance is added into a casting solution containing PVDF, an organic solvent and an additive, and the hydrophilic PVDF ultrafilter membrane is prepared by the utilization of a phase inversion method. By the adoption of the method, water contact angle of the prepared PVDF ultrafilter membrane can be reduced from about 85 degrees to about 60 degrees, and hydrophilicity of the PVDF membrane is obviously raised. Various substances concerned in the invention comprise, by weight, 10-25% of polyvinylidene fluoride (PVDF), 60-80% of a solvent for dissolving polyvinylidene fluoride, 1-10% of the TiO2 sol, and 0-10% of the additive, wherein the additive contains a mixture of anhydrous LiCl and PVP. Porosity of the prepared membrane is 50-80% and its membrane pore size is 0.01-0.2 micron. The method provided by the invention has a simple membrane forming technology, is convenient to operate, and is easy to realize industrial production. In addition, the prepared ultrafiler membrane has good hydrophilicity and high water flux, and has a wide application prospect.

The invention discloses a making method of nanometer crystal Li-Ti composite oxide, which comprises the following steps: adopting titanium powder or titanium compound as raw material; blending the materials with 30% hydrogen peroxidate under low temperature; adding certain quantity of lithium salt solution and moulder; stirring evenly; reacting under water bath condition at 50-100 deg. c completely; drying the composite system directly to produce predecessor; proceeding heat disposal for the predecessor at 200-400 deg. c for 2-6h; heating to 600-1000 deg. c; sintering 8-36h; cooling; grinding; obtaining the nanometer crystal Li-Ti composite oxide with spinel structure and the content of Li4Ti5O12 over 90%; controlling the even grain size of the product between 15nm and 100nm and specific surface area between 10 and 100m2 / g due to different aperture shape of moulds, sintering time and temperatures; making the reversible specific capacity of the product over 160mAh / g under 0. 1C charging and discharging condition; keeping the capacity maintaining rate between 50% and 70% under discharging condition at 100deg. c as ideal negative electrode material of lithium ion dynamic battery and lithium ion super-capacitance.

The invention discloses preparation and application of an MOF-supported bimetallic catalyst, and belongs to the technical field of catalysts. The preparation method of the catalyst comprises the following steps: 1) firstly, dispersing an MOF carrier in a hydrophobic solvent, then dropwise adding an aqueous solution of a first metal salt, carrying out ultrasonic stirring, then drying a product, andfinally reducing the dried product to reduce first metal salt ions into first metal; and 2) dispersing the product reduced in the step 1) in an organic solvent, adding a second metal organic salt inan inert atmosphere, stirring the solution, separating the obtained product, and washing and drying the product to obtain the MOF supported bimetallic catalyst. The MOF supported bimetallic catalyst is applied to CO2 hydrogenation to prepare methanol. Compared with a traditional Cu / ZnO catalyst, the catalyst has the advantages that under the same catalytic condition, the selectivity to methanol ishigher than 80%, the conversion rate is high, and the stability is greatly improved.

The invention discloses photo-curable 3D (three-dimensional) printing aluminum-base ceramic slurry and a method for preparing ceramic mold cores. The photo-curable 3D printing aluminum-base ceramic slurry comprises ceramic formula powder, photo-curable resin systems and additives. The photo-curable 3D printing aluminum-base ceramic slurry and the method have the advantages that the photo-curable 3D printing aluminum-base ceramic slurry is high in solid phase content, low in viscosity and applicable to photo-curable 3D printing photo-polymerization, the problems of high viscosity and poor flowability of existing slurry for photo-curable 3D printing ceramics, easiness in agglomerating ceramic particles in the existing slurry, uneven dispersion of the ceramic particles, low solid phase contents and the like can be solved, and application of photo-curable 3D printing to ceramic precision components can be expanded.

The invention discloses a finishing method for a textile with ultraviolet-resisting and antibacterial functions. The finishing method comprises the following steps: step (10), preparing a zinc oxide / carboxymethyl chitosan nano compound; step (20), pre-treating the textile with a cold plasma method; and step (30), preparing the zinc oxide / carboxymethyl chitosan nano compound prepared by the step (10) into a zinc oxide / carboxymethyl chitosan nano compound solution, and immersing the textile pre-treated by the step (20) with the solution; and adding an acrylic ester binding agent and adopting a rolling baking process to obtain the treated textile. The textile prepared by the finishing method has good ultraviolet-resisting and antibacterial functions.

The invention relates to a preparation method of nanometer silver antibacterial agent, which belongs to the technical field of the antibacterial agent preparation. The invention is characterized in that distilled water or deionized water is taken, nanometer silicon dioxide carrier is added, dispersing protective agent adopts polyvinyl pyrrolidon which is evenly mixed; then silver salt silver nitrate and reducing agent sodium borohydride are added, mixed and dispersed, and the nanometer silver antibacterial agent colorless transparent solution is obtained through sufficient reaction, being bottled and packaged in a sealing way. The invention extends the application scope of nanometer silver greatly; the particle diameter is small, and the particle diameter distribution is even; the smaller particle diameter has higher specific surface area, higher antibiotic activity and lower dosage; the dispersivity of the nanometer silver collosol system is good, and aggregation is not easy to occur; the environment is friendly, and the nontoxic and the nuisance-free raw materials are adopted for the preparation; the invention has quite excellent environment affinity, and pollution can be caused to the environment.

The invention provides a preparation method of nanometer silver particles. The preparation method comprises the following steps of: (a) adding a silver source, a coating agent and ammonia water into water under the conditions of stirring and heating to obtain a reaction solution with the pH value being 7-12, wherein the molar ratio of the silver source to the coating agent is 1:(1-5); (b) adding crown ether into the reaction solution under a stirring state, wherein the molar ratio of the crown ether to the silver source is (1-3):1; and (c) adding a reducing agent containing alkali metal into a mixture solution obtained in (b) under a stirring state to obtain nanometer silver particles, wherein the molar ratio of the reducing agent to the silver source is (1-3):1. According to the invention, the crown ether is added into the reaction system in a reaction process, meanwhile, the reducing agent containing the alkali metal is used in a matching manner. The crown ether is added to facilitate distantiation between positive charges and negative charges in a nano-silver system, so that nano-silver can stably disperse in a water solution without agglomeration.

The invention relates to nanometer material and in particular relates to porous nanometer zero-valent iron composite material mainly made from main active constituent component, a skeleton component and an auxiliary component. The main active constituent component is nanometer zero-valent iron; the skeleton component is made from one or more than one metal of Al, Mn, Si and Zn; and the auxiliary component is made from one or a plurality of components of the Ni, Pt, La, Cu and Pd. The invention further relates to the preparation method for the porous nanometer zero-valent iron composite material and purposes of the porous nanometer zero-valent iron composite material on fields of water pollution processing, soil pollution processing and environment repairing.

The invention discloses a method for preparing superfine nano-silicon by taking a silicon-containing biomass as the raw material. The method comprises the following steps: eliminating an inorganic salt ion impurity by performing acid boiling on the silicon-containing biomass, grinding and smashing the white powders processed by air annealing to obtain a nano-silicon dioxide granule, uniformly mixing the white product, the magnesium powder and the fused salt, putting into a tube furnace, reacting under an inert atmosphere to obtain the silicon and the magnesium oxide, and removing the magnesium oxide by performing acid dipping on the reaction product to obtain the superfine nano-silicon granule. The reaction step is simple and practicable, the sources of the raw materials are extensive, most importantly the reaction temperature is controlled by adding the fused salt to melt and absorb heat, the reactant is hard to agglomerate, the specific surface area of the prepared nano-silicon is 302.13m<2> / g, the purity is greater than 98%, the granules are uniform with mesopores and the nano-silicon can be used in the fields such as the lithium ion battery, the semiconducting material and the medicine.

The present invention relates to method of synthesizing nano grade titanium carbide by using microwave, it is proceeded as follows: titanium dioxide and acetylene carbon black are over dried to form raw material, then the raw material: zirconium pellet: absolute ethyl alcohol are mixed in ratio 1:1-5:3-6, and ground in ball mill to unifom, over dried microwave heating and synthesizing to obtain product, advantages include: low reaction temperature, simple technological process, easy to control, the obtained TiC powder is not easy to agglomerate, no impurity etc.

The invention discloses a preparing method for green synthesis of nanoscale zero-valent iron through water hyacinth extraction liquid and application. Water hyacinth stem and leaf extraction liquid serves as a reduction agent to reduce iron ions or ferrous ions to the zero-valent iron, a chromium pollution water green repairing material-green synthesis nanoscale zero-valent iron particles are obtained through preparing. The synthesis method is low in synthesis cost, small in energy consumption, simple in process, and free of a special device, the used reduction agent is the water hyacinth stem and leaf extraction liquid, wastes are utilized, and the synthesized particles are easily agglomerated and have the beneficial effects of being good in flowability, large in specific surface area, high in stability and the like. The repairing material prepared through the method is suitable for repairing the chromium pollution water and is high in repairing efficiency.

The invention discloses a graphene-supported copper-nickel composite nanometer photocatalyst, and a preparation method and application thereof. Oxidized graphene modified by an organic molecule and a metal precursor are subjected to thermal recovery under an alkaline and high temperature environment so as to obtain highly disperse and uniform Cu-Ni / graphene composite nanomaterial without using other surface active agents, and poisonous reducing agents such as sodium borohydride and hydrazine hydrate, and duplex-metal loading capacity is 10-15wt%. The preparation method provided by the invention has the advantages that a reaction condition is gentle, a synthetic process is simple and easy to operate, a reaction medium is green and the like, the synthetized product is capable of efficiently performing catalytic degradation on rhodamine b, and the graphene-supported copper-nickel composite nanometer photocatalyst has a good catalytic effect, and has a wide application prospect in fields such as sewage treatment and organic matter degradation.

The invention discloses a method for preparing metal doped TiO2 nanocrystal particles. The method comprises the following steps: dispersing a titanium source in a metal ion aqueous solution, hydrolyzing to obtain metal ion doped hydrated titanic acid precipitation, dispersing the metal ion doped hydrated titanic acid precipitation in a hydrogen peroxide aqueous solution, and hydrothermally reacting to obtain the metal doped TiO2 nanocrystal particles. The method for preparing the metal doped TiO2 nanocrystal particles, which is disclosed by the invention, can be used for preparing metal doped monodisperse and suspended TiO2 nanocrystal particles with visible-light activity, and the method has a good application prospect in the fields of photocatalytic air purification, photocatalytic water treatment and the like.

The invention provides high-conductivity aluminum-doped nano-zinc oxide powder and a preparation method thereof. The method of the invention comprises the steps that aluminum-doped zinc oxide nanocrystals are first prepared by solvothermal reaction and then sintered in the atmosphere of hydrogen to obtain nanometer-degree quasi-spherical conductive powder. The conductive powder is white and slightly gray and is non-toxic, light in weight and environment-friendly and also has less conglobation, good dispersity and repeatability and uniform size distribution; in addition, the particle size of the powder synthesized in different solvents is different and the minimum resistivity of the powder can reach 15 Omega cm and can be suitable for the various demands of products. The preparation method of the invention is simple in operation, short in period and low in cost, needs no surface active agents and templates and can be applied to mass production. The nanometer-degree conductive powder obtained by utilizing the method can be taken as conductive filler to be widely applied to fields such as paints, rubber, plastics and fibers, etc., for carrying out electrostatic prevention and electromagnetic shielding.