33results about "Nanotechnology" patented technology

The invention discloses a purification method of a nano diamond ash material. The method adopts a three-step method to remove impurities in nano diamond detonated ash and comprises the following steps of: step 1, utilizing nitric acid or hydrochloric acid to remove impurities including metal oxides or metal salts; step 2, utilizing a concentrated sulfuric acid and perchloric acid united oxidization method to remove graphite carbon components in nano diamond; and step 3, utilizing hydrofluoric acid to remove silicon oxide. The invention provides a production method of the high-purity nano diamond, which has the advantages of simple process, low equipment requirements and high product purity; and the produced nano diamond can completely meet the requirements of relevant fields, particularly the application of fields including ultra-precise polishing, high-grade running-in (lubricating) oil, wear-resisting material additives, wear-resisting surface composite plating and the like.

Techniques herein include patterning processes to prevent over-etching for various multi-patterning processes. Multi-patterning processes typically involve creation of sidewall spacers and removal of mandrels on which sidewall spacers are formed. In some patterning flows gouging of underlying layers can occurs during the various multi-patterning steps. Techniques herein include methods to prevent such gouging by using a planarization layer recessed sufficiently to removed desired materials and protect others. Such techniques can remove bi-layer mandrels without gouging underlying layers.

The invention discloses a preparation method of an oxide nanocrystal solid. According to the method of the invention, a soluble high valence metal cation is hydrolyzed, while a metal oxide anion is not hydrolyzed but taken as a protective agent to form a metal oxide nanocrystal, and then self-assembly is performed to form a three-dimensional nanocrystal solid with nanocrystal particles in ordered arrangement. The preparation method of the oxide nanocrystal solid of the invention is an inexpensive, simplified, non-toxic and pollution-free method, which hydrolyzes the metal cation into oxide nanoparticles that are then assembled into a novel photoelectric material with a three-dimensional ordered structure. As the method of the invention employs pure inorganic substances for reaction, the product has substantially improved electroconductive performance, and a special photoelectric performance is generated.

The invention relates to a method for preparing nesquehonite whiskers and nano flaky basic magnesium carbonate. The method is characterized in that sodium bicarbonate and magnesium chloride are used as raw materials, and nesquehonite whisker samples with high aspect ratio of 20-30 and narrow distribution range are obtained by controlling reaction conditions; filtrate obtained by filtering nesquehonite is subjected to further high-temperature reaction to obtain nano flaky basic magnesium carbonate with the content of 41-44%; after the reaction, evaporation, concentration and crystallization are performed on filtrate obtained by filtering the basic magnesium carbonate to allow the sodium chloride crystals to be separated, and the sodium chloride crystals are obtained through filtering. The method has the advantages the method is simple in preparation process, easy in process control, mild in condition and easy to achieve industrialization; the nesquehonite whiskers are high in purity, good in overall dispersity, high in aspect ratio and narrow in distribution range; total reaction yield is above 98.0%, and raw material utilization maximization is achieved; the side products sodium chloride can be recycled and refined.

The invention provides a method for preparing flowerlike nanometer cobalt by using electro-conductive glass FTO, an anodised aluminum template (AAO) and an aqueous high-molecular adhesive as a combined electrode. The method comprises the following steps: (1) preparation of a working electrode: a step of coating the electro-conductive glass with a solution of the aqueous high-molecular adhesive--polyvinyl alcohol (PVA) through spin coating and bonding the anodised aluminum template so as to obtain the FTO/PVA/AAO combined electrode; (2) preparation of an electrolyte: separately preparing cobaltous sulfate and a boric acid solution and mixing the cobaltous sulfate with the boric acid solution; (3) electrodeposition reaction: a step of carrying out constant-voltage electrodeposition on the combined working electrode; and (4) post-treatment: a step of soaking the working electrode having undergone electrodeposition in sodium hydroxide to remove the anodised aluminum template. According to the invention, FTO/PVA/AAO is used as the combined working electrode and constant-voltage electrodeposition is carried out so as to prepare the novel flowerlike nanostructured cobalt; and the method is simple and fast and has the advantages of mild reaction conditions, short time, high efficiency and no need for high temperature and high pressure conditions compared with conventional methods.

The invention discloses a preparation method of rare earth perovskite type composite oxides, and belongs to the technical field of perovskite materials. The preparation method comprises following steps: (1) mixing metal chlorides according to a certain stoichiometric mole ratio, dissolving metal chlorides into water, and adding organic compounds to obtain a mixed solution of chlorides; (2) atomizing the chloride mixed solution by a nozzle to form droplets, spraying the mixed solution from the bottom of a pyrolysis furnace or above a pyrolysis furnace, and carrying out solid-liquid separation to obtain a mixture solid; and (3) burning the mixture solid to obtain rare earth perovskite type nano powder. Rare earth chlorides are taken as the raw materials, by controlling the conditions of reactions of the chloride solution in a pyrolysis furnace, high purity rare earth perovskite type composite oxides can be synthesized at a low temperature, and the raw material cost and energy consumptionare reduced.

The invention discloses a g-C3N4 crystal phase/amorphous phase homojunction as well as a preparation method and application thereof. The homojunction is characterized in that crystal phases and non-crystal phases are alternately distributed on the same graphite phase C3N4 to form the homojunction. The preparation method comprises the following steps of performing primary heat polycondensation on nitrogen-containing organic precursors; grinding the obtained blocky graphite phase carbon nitride into powder; performing ultrasonic thinning and dispersion to obtain powder; performing secondary heatpolycondensation on the powder to obtain a product. The homojunction and the preparation method have the advantages that simplicity is realized; the implementation is easy; the cost is low; the repeated performance is good; the enlightening significance is realized on the synthesis of layered graphene semiconductor materials. The crystal phase and amorphous phase part of the obtained homojunctionis adjustable in proportion. Compared with the homojunction with the conventional appearance, the homojunction has higher catalysis activity, is favorable for the efficient separation of electron-hollow hole pairs, and improves the reaction activity. Compared with the homojunction prepared by a seed growth method, the homojunction has the advantages that the synthesis process is simple. In an aspect of visible light photocatalytic degradation, the relatively excellent photocatalytic performance is far higher than that of ordinary flaky carbon nitride.

The invention discloses a preparation method of nano-magnesium hydroxide. The preparation method comprises the following steps: carrying out ultrasonic dispersion on ammonia water and a sodium hydroxide solution so as to obtain a mixed alkali solution, and adding the mixed alkali solution into a reactor; putting the reactor in an ultrasonic field, dropwise adding a polyethylene glycol 6000 water solution into the reactor in a constant speed, and further carrying out ultrasonic dispersion for 0.5-1 hour; dropwise adding a magnesium chloride water solution into the reactor in a constant speed; after the dropwise adding of the magnesium chloride water solution, further carrying out ultrasonic dispersion for 0.5 hour; adding turbid liquid obtained in the reaction into a hydrothermal reaction kettle for treatment, so as to obtain Mg(OH)2 precipitates; and carrying out suction filtration, washing, drying and grinding on the precipitates, so as to obtain nano-Mg(OH)2. Nano-magnesium hydroxide is prepared by virtue of an ultrasonic-hydrothermal coupling method, and reaction conditions are easily controlled, so that the problems that nano-Mg(OH)2 particles easily form colloid in a solution and are unlikely to be filtered are solved; and the particle size of the prepared nano-Mg(OH)2 particles is small, the particle size distribution is uniform, the crystallization degree is high, the technical flow of the preparation method is simplified, the energy consumption is reduced, and the production cost is saved.

The invention discloses a preparation method of a SnS2 nanosheet loaded graphene-based nano composite material, which comprises the following steps: step 1, dispersing graphene oxide nanosheets in deionized water to prepare a graphene oxide solution; 2, dissolving tin tetrachloride in deionized water, and adding thiourea as a sulfur source and a reducing agent; 3, adding the graphene oxide solution in the step 1 into the solution obtained in the step 2, and carrying out mixing treatment through ultrasonic waves and transferring a mixture of the two solutions subjected to ultrasonic treatment into a hydrothermal reaction kettle for reaction to obtain a precipitate; and 4, centrifuging, washing, drying and grinding the precipitate obtained by the reaction in the step 3 to obtain the graphene nanosheet/tin disulfide composite nanomaterial. The graphene nanosheet/tin disulfide composite nanomaterial prepared by the method has higher capacity and stability when being used as a sodium storage electrode material.

The invention discloses a pyridine quinoxaline double pillar [n] aromatic hydrocarbon based nanoparticle, and a preparation method and applications thereof. The preparation method comprises followingsteps: double pillar [n] aromatic hydrocarbon main body molecule H and object molecule G1 and G2 are mixed to be uniform in an organic solvent at a certain ratio, an obtained mixture is introduced into a surfactant aqueous solution so as to obtain the pyridine quinoxaline double pillar [n] aromatic hydrocarbon based nanoparticle. The pyridine quinoxaline double pillar [n] aromatic hydrocarbon based nanoparticle possesses excellent water solubility, and excellent light capturing performance; pyridine quinoxaline double pillar [n] aromatic hydrocarbon is taken as an energy donor; object moleculeG2 is taken as an energy receptor, and G1 is taken as an energy bridge, so that transmission of the subject energy to the object is realized, and the fluorescence intensity of the nanoparticle composed of H, G1, and G2 is increased to be much higher than that of G2 nanoparticle at the same concentrations.

The invention discloses a synthesis method for a porous ZnCo2O4 nanosheet and a pseudo-cubic micro-nano structure. The synthesis method comprises the following steps: (1) weighing CTAB (CetyltrimethylAmmonium Bromide), and dissolving in the mixed solution of deionized water and ethylene glycol at a constant temperature to obtain settled solution; (2) weighing Zn(NO3)2.6H2O, Co(NO3)2.6H2O and ureaat the molar ratio of 1:2:15, dissolving in the solution obtained in (1), and fully stirring; (3) transferring the solution obtained in (2) to a polytetrafluoroethylene lining stainless steel reaction kettle, sealing, and reacting for 3-20h at the temperature of 100-180 DEG C; (4) after reaction is finished, naturally cooling to room temperature, carrying out centrifugation, respectively cleaningwith the deionized water and absolute ethyl alcohol for three times, and drying to obtain a Zn-Co precursor. According to the synthesis method, through the simple regulation and control of reaction parameters, the micro-nano structure of ZnCo2O4 of different morphologies can be obtained through synthesis.

The invention provides a reusable nano core-shell structure mimic enzyme material and a preparation method thereof. The preparation method comprises the steps: taking an iron source and an ammonium source, adding the iron source and the ammonium source into a solvent, performing ultrasonic stirring to obtain a mixed solution A, reacting the mixed solution A under a first preset condition, performing magnetic separation, then washing, and drying to obtain magnetic nano iron; and performing ultrasonic stirring on the magnetic nano iron, a manganese source and an ammonium source in deionized water to obtain a mixed solution B, performing reaction on the mixed solution B under a second preset condition, performing magnetic separation, then washing, and drying to obtain the reusable nano core-shell structure mimic enzyme material. The preparation process is simple, the raw materials are simple and easy to obtain, and the method is biological and environment-friendly and can be suitable for industrial large-scale production, and the prepared product has the characteristics of magnetic separation and recycling, still keeps extremely high enzyme activity in regeneration and recycling, and has a wide application prospect.

The invention discloses a polyacrylate grafted graphene oxide plugging agent and an oil-based drilling fluid. A plugging agent used by the oil-based drilling fluid is polyacrylate grafted graphene oxide, and the polyacrylate grafted graphene oxide plugging agent is prepared from the following synthetic raw materials: graphene oxide, an amino silane compound, an acrylate compound and an acrylamide compound. The drilling fluid comprises the polyacrylate grafted graphene oxide blocking agent disclosed by the invention. The polyacrylate grafted graphene oxide is used as a blocking agent, the particle size of the polyacrylate grafted graphene oxide is approximately distributed between 60 nm and 1200 nm, nano apertures in a shale stratum can be effectively blocked, and therefore the well wall can be effectively stabilized, and collapse can be prevented; the plugging agent has small influence on the performance of the drilling fluid and is beneficial to reducing the filter loss of the drilling fluid, and the oil-based drilling fluid used by the plugging agent has good rheological property, water loss wall-building property, plugging property and the like under the shale formation condition.

The invention provides preparation methods of high-specific-surface-area nano W powder and high-specific-surface-area nano WC powder. The preparation method of the high-specific-surface-area nano W powder comprises the steps that blue tungsten powder serves as a raw material, reverse hydrogen reduction is adopted, a heating zone of a hydrogen reduction furnace is divided into a low-temperature zone, a medium-temperature zone and a high-temperature zone, the temperature of the low-temperature zone is set to be 500-800 DEG C, the temperature of the medium-temperature zone is set to be 600-900 DEG C, the temperature of the high-temperature zone is set to be 700-1000 DEG C, and reaction time is 5-9 h. According to the preparation method of the high-specific-surface-area nano WC powder, the high-specific-surface-area nano W powder prepared through the method and a carbon source serve as raw materials, the reaction temperature is set to range from 900 DEG C to 1300 DEG C, and the reaction time ranges from 2 h to 6 h. The BET value of the nano W powder obtained through the method reaches 25.55 m<2>/g, and the BET value of the nano WC powder obtained through the method is larger than 4.0 m<2>/g.

The invention relates to a preparation method of nano-scale manganese lithium phosphate. The preparation method comprises the following steps: (S1) preparing manganese sesquioxide saturated choline chloride ionic liquid; (S2) preparing an aluminum-net-base lithium phosphate pole piece; and (S3) carrying out electro-depositionin the sesquioxide saturated choline chloride ionic liquid by taking the aluminum-net-base lithium phosphate pole piece as a cathode, so as to grow nano-scale manganese lithium phosphate on the cathode. The particle size of nano-scale manganese lithium phosphate prepared by virtue of the choline chloride ionic liquid is relatively uniform, the preparation process is environment-friendly, the technology is simple, and the preparation process is easily controlled.

The invention discloses a microwave-assisted large-scale preparation method of carbon nanospheres from lignin. The method comprises the steps of uniformly mixing the lignin with silicon carbide, and putting a mixture in a microwave tubular reactor; introducing nitrogen into an inlet of the microwave tubular reactor to discharge air in a reaction system, connecting outlet gas of the microwave tubular reactor with a cold hydrazine system, enabling nitrogen to pass through dichloromethane to enable the nitrogen to carry dichloromethane, and introducing the nitrogen carrying the dichloromethane into the microwave tubular reactor; under the condition of ensuring that nitrogen carrying dichloromethane is introduced, the microwave tubular reactor is started to carry out reaction, taking the mixture of lignin carbon and silicon carbide from the microwave tubular reactor after the reaction is finished, putting the mixture into water or ethanol, performing uniform stirring and standing, taking out lignin carbon floating on a liquid, and performing drying to obtain a solid product, namely the carbon nanospheres. The method is beneficial to the turning of waste lignin resources into wealth, and the high-valued utilization is realized.

The invention discloses a preparation method of simple substance nano powder through plasma chemical vapor reactions, and belongs to the technical field of new material preparation. According to the preparation method, plasma is taken as the heat source, high purity raw material gas is introduced into a plasma high temperature area, the high purity raw material gas and hydrogen carry out gas phasereduction reactions: MClx+H2=M+HCl; generated high purity single substance steam (M) is carried by carrier gas to go through a cooling area, through rapid condensation nuclei, corresponding powder isformed; and finally single substance nano powder is obtained by a powder separating-collecting device. The purity of the simple substance nano powder prepared by the provided method is high, and theparticle size is 100 nm or less and is controllable.

The invention relates to a preparation method and application of waxberry-shaped nano silicon particles, which belong to the technical field of building materials. The technical problems that an existing concrete sealing curing agent is prone to whitening, and strength improvement is limited are solved. The concrete sealing curing agent is prepared from waxberry-shaped nano silicon particles with ultrahigh specific surface area and the like through a one-step mixing method. According to the curing agent disclosed by the invention, the ultrahigh specific surface area and microstructure characteristics of the waxberry-shaped nano silicon particles are effectively utilized, more reaction active sites are provided for free calcium ions in the nano silicon particles and concrete, stable and firm C-S-H permanent gel is formed, and meanwhile, the curing agent also serves as a physical anchoring point, and the curing strength is further improved. After uniform permeation, the curing agent can form a compact and firm protective layer with a hydrophobic effect, so that the compactness of the concrete is effectively enhanced, and the firmness, wear resistance, permeability resistance and saltpetering resistance of the concrete are greatly improved.

Silica particles includes a nitrogen-containing compound. The ratio of the integral C of a signal observed at a chemical shift of −50 ppm or more and −75 ppm or less in a ²⁹Si solid-state nuclei magnetic resonance (NMR) spectrum of the silica particles, the ²⁹Si solid-state NMR spectrum being obtained by cross polarization/magic angle spinning (CP/MAS), to the integral D of a signal observed at a chemical shift of −90 ppm or more and −120 ppm or less in the ²⁹Si solid-state NMR spectrum, that is, C/D, is 0.10 or more and 0.75 or less. The amount X of the nitrogen-containing compound extracted from the silica particles with a mixed solution of ammonia and methanol is 0.1% by mass or more. The amount X of the nitrogen-containing compound extracted and the amount Y of the nitrogen-containing compound extracted from the silica particles with water satisfy Y/X<0.3.

The invention provides a preparation method of a double-layer zinc stannate nanosheet negative electrode material and a product and application of the double-layer zinc stannate nanosheet negative electrode material. Zinc salt and tin salt are dissolved in deionized water according to the molar ratio of 2: 1: 300, and stirring is conducted till the solution is clear; carrying out oil bath reflux at 110-120 DEG C for 3-5 hours, cooling to room temperature, washing and drying to obtain dispersed zinc stannate nanoparticles; the preparation method comprises the following steps: dispersing zinc stannate nanoparticles in 50 mL of isopropanol, magnetically stirring for 24-48 hours, centrifuging for 10-20 minutes at the rotating speed of 8000-10000 rpm, and drying to obtain the double-layer zinc stannate nanosheet. The double-layer zinc stannate nanosheet has larger specific surface area and conductivity, is beneficial to improving the electrochemical performance of the material, has the first charge specific capacity of 680 mAh/g and the first discharge specific capacity of 1347 mAh/g, and has higher discharge specific capacity. The preparation process is relatively simple and easy to operate.

The invention discloses a Mie resonance anti-counterfeiting product based on hollow structure blue TiO2 and an anti-counterfeiting method of the Mie resonance anti-counterfeiting product and is applied to commodity anti-counterfeiting authentication. The anti-counterfeiting product takes a hollow structure TiO2 material as an anti-counterfeiting material, and TiO2 hollow spheres in the anti-counterfeiting material have the shell thickness of 15-25 nm and inner diameter of 170-190 nm. The hollow structure blue TiO2 material is prepared in the following steps: anti-counterfeiting pattern production; material spraying, medium conversion color change and medium restoration color recovery. The Mie resonance anti-counterfeiting product and the anti-counterfeiting method have the advantages thatMie resonance anti-counterfeiting product has unique color change and high response speed, is easy to distinguish by human eyes, cannot be copied easily and has high anti-counterfeiting level.

Disclosed herein are a flux and a soldering paste based on the flux. The flux is free from a change in viscosity with age, “skinned surface,” and “rough and crumbling,” and is excellent in printability and solderability. The flux contains, as elements, a resin, a thixo agent, an activator, a solvent and glucopyranosylamine type nanotube. The soldering paste further contains a solder powder. Preferably, the solder powder is free from lead.

The invention discloses anti-oxidation lubricating oil. The anti-oxidation lubricating oil comprises the following components in parts by weight: 80-90 parts of base oil, 2-6 parts of 4-butyldiphenylamine, 0.2-1 part of surface modified nano silicon carbide particles and 2-6 parts of molybdenum-containing compound, and further discloses a preparation method of the anti-oxidation lubricating oil. The anti-oxidation lubricating oil is included. The preparation method of the antioxidant lubricating oil comprises the following steps: preparing 4-butyldiphenylamine; preparing surface modified nanosilicon carbide particles; enabling the 4-butyldiphenylamine, surface-modified nano silicon carbide particles, the molybdenum-containing compound and base oil to be matched in parts by weight to prepare a composition, wherein the composition reacts under preset conditions to prepare the antioxidant lubricating oil; and on the basis of the prior art, the surface-modified nano silicon carbide particles and the 4-butyldiphenylamine are additionally arranged in the base oil, so that the antioxidant stability of the lubricating oil is improved effectively; and the molybdenum-containing compound isadditionally arranged and is matched with the surface-modified nano silicon carbide particles, so that the antioxidant stability of the lubricating oil is improved.