102results about How to "The experimental equipment is simple" patented technology

The invention provides an InAs/GaSb superlattice infrared photoelectric detector and a manufacturing method thereof. The InAs/GaSb superlattice infrared photoelectric detector comprises a substrate, an epitaxy structure deposited on the substrate, an upper metal electrode formed above steps, a lower metal electrode formed under the steps and a passivation layer, wherein the epitaxy structure comprises an n-type doping buffer layer, an n-type electrode contact layer, a barrier layer, an intrinsic absorption layer, a p-type electrode contact layer and a cover layer, the steps are formed on two sides of the epitaxy structure through etching, the intrinsic absorption layer is composed of a plurality of periodical InAs/InSb/GaSb/ InSb superlattice structures. In the InAs/GaSb superlattice infrared photoelectric detector, InSb is respectively inserted into two interfaces of each superlattice period of the intrinsic absorption layer to form strained superlattices, the stress between the superlattices and the substrate is effectively balanced, the material growing quality is improved, and accordingly the photoelectric performance of the detector is improved.

The present invention discloses a preparation method of graphitized carbon nano material which relates to a preparation method of carbon nano material. Problems like high cost and environment pollution in existing graphitized carbon nano material process are solved through the invention. The method is as following: 1. pretreatment of carbon source; 2. energizing agent in solvent and carbon source after pretreatment; 3. pre-carbonization; 4. heat treating; 5. acid treatment; 6. physical activation or chemical activation. The invention has features like simple process, little pollution to environment, low cost, simple equipment and easy commercialization.

The invention relates to the technical field of nanometer materials and the preparation thereof, in particular to a hydroxyapatite with a hollow nanometer structure and a preparation method thereof. The outer appearance of the hydroxyapatite with the hollow nanometer structure is elliptic, spindle-shaped or hexagonal prism-shaped; and the nanometer structure is a hollow structure. The preparation method comprises the following steps: dissolving a certain quantity of calcium sources, phosphor sources, fluoride and chelating agents into deionized water; then adjusting the pH value of the solution; transferring the solution into a hydrothermal kettle and carrying out hydro-thermal reaction for a period time; and centrifuging, washing and drying after the reaction. Any templates and surface active agent are not used in the invention; the hollow nanometer structure of the hydroxyapatite is synthesized for one step; and the invention has the advantages of low cost, mild reaction conditions and simple devices required. The hollow nanometer structure of the hydroxyapatite prepared in the invention has uniform dimension, good dispersivity and large volume of a hollow part, and can be used as medicine and catalyst carriers.

The invention discloses a method for measuring a dynamic capillary pressure of a core. The method comprises the following steps of: washing, drying and evacuating the core; saturating the core with a first fluid; putting the saturated core into a core clamp holder by using core displacement equipment; setting an experimental temperature; completely saturating dead volume parts of pipelines at an upstream end and a downstream end of the core with the first fluid; simultaneously setting a return pressure as a strata pressure; keeping a constant pressure and injecting the first fluid; after the upstream and downstream differential pressure of the core is stable, stopping injecting the first fluid; injecting a second fluid, wherein the second fluid is injected into a pipeline at the upstream end of the core under the same differential pressure as that of the first fluid; displacing the first fluid in a dead volume of the pipeline at the upstream end and making the first fluid enter the core; recording the change of the accumulated flow at the outlet end of the core along with time in the process of injecting the second fluid; and measuring the dynamic capillary pressure by calculating. The method of the invention has a simple process, is easy to operate, and is rapid and accurate.

The invention relates to a preparation method of a sequential black mesoporous titanium dioxide visible light catalyst film. The invention aims to solve the problems that titanium dioxide prepared by the existing method cannot effectively absorb visible light of sunlight and a surface-hydrogenated titanium dioxide (black titanium dioxide) catalyst is difficult to recover. The preparation method is implemented by the following steps: 1, soaking: soaking a porous ceramic film into titanium dioxide sol; 2, drying: drying at the temperature of 60 to 90 DEG C for 12 to 24 hours to obtain a porous ceramic film of the titanium dioxide sol; 3, performing heat treatment: maintaining the temperature of 400 to 800 DEG C for 2 to 8 hours to obtain the porous ceramic film of the titanium dioxide sol after heat treatment; and 4, hydrogenating: hydrogenating for 2 to 10 hours under the condition of protective gas to obtain the sequential black mesoporous titanium dioxide visible light catalyst film. The preparation method of the sequential black mesoporous titanium dioxide visible light catalyst film is applied to the field of water treatment.

The invention discloses a surface self-cleaning carbon nitride Fenton-photocatalytic nanofiltration membrane and a preparation method thereof and belongs to the fields of water treatment membrane materials and preparation processes of the water treatment membrane materials. The method comprises selecting carbon nitride photocatalysts which integrate plasticity of polymer molecules and chemical stability of carbon materials and performing surface modification, chemical modification, Fenton-like agent compounding and the like to prepare a multifunctional water treatment membrane. On the one hand, inter-element triangular nanopores formed by carbon nitride can provide stable natural channels for rapid passage of water molecules; on the other hand, through irradiated catalytic degradation andiron-containing agent Fenton-like oxidation, in-situ degradation of nanofiltration retained pollutants can be achieved. The surface self-cleaning carbon nitride Fenton-photocatalytic nanofiltration membrane provides a new way for solving the problem of membrane contamination difficult for traditional nanofiltration membrane materials and has the advantages of being simple in preparation method, low in cost, resistant to pollution, low in water mass transfer resistance and the like, thereby being applicable to application to the field of water purification.

The invention provides a method for preparing a titanium dioxide nano tip array film for field emission, mainly comprising the following steps of: firstly, performing primary anodic oxidation on a swing-cleaned titanium sheet, and then removing the titanium dioxide nano-tube film attached to the titanium sheet through ultrasound; and next, loading the titanium sheet into the electrode again and performing secondary anodic oxidation, and then taking out the titanium sheet for cleaning through swinging to finally obtain the titanium dioxide nano tip array film. The method provided by the invention realizes the preparation of the titanium dioxide nano tip array film suitable for field emission. Compared with the traditional microelectronic field emission tip array, the method provided by the invention is simple, and preparation parameters are easy to control; and the tip of the array is sharp, which is advantageous for gaining field emission. Furthermore, the titanium dioxide nano tip array film annealed at high temperature previously has lower opening and threshold field intensity; and particularly, the sample annealed at 450 DEG C has the minimum opening and threshold field intensity and is obviously improved in field emission performance.

A preparation method of a PDMS film with thermosensitivity comprises the following steps: carrying out rotary evaporative concentration on aqueous-phase cadmium telluride quantum dots prepared by a hydrothermal method, carrying out purification treatment by settling with isopropanol, dispersing the purified product in anhydrous ethanol, uniformly dispersing the cadmium telluride quantum dots in a PDMS prepolymer through the affinity interaction between the PDMS prepolymer and aqueous-phase quantum dots, mixing and curing by adding a curing agent, so as to obtain optically transparent PDMS film with thermosensitivity. The raw materials used in the invention are easily available, required experimental equipment is simple, and the technological process is easy to master. By the preparation method, a thermosensitive PDMS film having uniform euphotic layer and with good film-forming ability can be prepared.

The invention provides a preparation method of silica/gold/ silica three-layer nano particles. The preparation method comprises the following steps: after performing amination modification on silica nuclear particles, absorbing nano gold particles; then putting in a gold hydroxide aqueous solution, adding formaldehyde used as a reducing agent and performing oxidation reduction reaction so as to form a gold shell; performing surface finishing on silica/gold double-layer core-shell particles by use of heavy polymer polyvinyl pyrrolidone; performing centrifugal cleaning, and adding a silicon source for growing a transparent silica layer and a catalyst, thereby preparing the silica/gold/ silica three-layer nano particles. Raw materials used in the preparation method are easily available, required experimental equipment is simple, the technical process is easy to master, and the preparation method can be used for preparing compound particles with favorable dispersibility and uniform light-transmitting layer.

The invention discloses a method for detecting a fluorescent brightener in food and paper packaging thereof. The method comprises the following steps: (1) preparing fluorescent brightener standard solutions with different concentrations; (2) preparing a standard curve between the fluorescent brightener concentration and absorbancy; (3) extracting a fluorescent brightener; and (4) arranging the filtrate in the step (3) in a quartz cuvette being 1cm, measuring the absorbancy at 350nm by adopting an ultraviolet spectrophotometer, performing a blank experiment, and calculating to obtain the content of the fluorescent brightener in the food and paper packaging thereof according to the standard curve obtained in the step (2). The fluorescent brightener detection in the food and the paper packaging thereof is realized by adopting ultraviolet spectrophotometry, the experimental apparatus is simple, the operation is convenient, and the method has the advantages of quantitative analysis, low detection limit, high repeatability and the like and is suitable for measurement of micro and trace components.

The invention discloses a preparation method of bismuth nanocrystalline. BiCl3 is taken as a bismuth source, phenanthroline is used as a surface modifier and NaBH4 is used as a reducing agent, and the bismuth nanocrystalline is synthesized in a water phase by a liquid phase surface modifying reduction method. The preparation method of bismuth nanocrystalline provided by the invention is simple in operation steps; as the types of the raw materials used are few, the preparation method is low in cost, easy to implement, and safe and environment-friendly; the experimental equipment is simple and the experimental conditions are easy to control; the bismuth nanocrystalline prepared by the method is high in purity.

The invention discloses a method for preparing a Mn2O3 porous micro-nano structure material having controllable morphology. The method comprises that ammonium bicarbonate and manganese acetate as raw materials in water as a solvent undergo a reaction under control of concentrations of the two raw materials, a mixing rate and reaction time to produce manganese carbonate precursors having different main body morphologies, and the manganese carbonate precursors are sintered at a high temperature to form a Mn2O3 porous negative electrode material having a controllable main body structure. The Mn2O3 material microstructure can be controlled and changed from a porous ball to a porous cube and has the sizes of 1-1.5 microns and mesoporous sizes of 10-30nm. The method has the advantages of common and nontoxic raw materials, simple and easy reaction, high conversion rate, large yield, industrial production feasibility and excellent performances in the field of sodium ion batteries.

The invention relates to a method for preparing ultra-dispersed antimony selenide nanowires for sodium-ion battery negative electrodes with an ultrasonic-assisted hydrothermal method. The method includes: adding beta-cyclodextrin into distilled water, and performing ultrasonic oscillation to obtain a solution A; adding tartaric acid and antimony potassium tartrate into distilled water with stirring to obtain a solution B; dispersing selenium powder into hydrazine hydrate, and performing ultrasonic oscillation to obtain a wine red solution C; adding the solution B into the solution A drop by drop with stirring to obtain a mixed solution D; adding the wine red solution C into the mixed solution D drop by drop, and stirring evenly prior to hydrothermal reaction at the temperature of 130-180 DEG C for 3-24h to obtain the ultra-dispersed antimony selenide nanowires for sodium-ion battery negative electrodes. The ultra-dispersed Sb2Se3 nanowires for sodium-ion battery negative electrodes are prepared by adopting the rational additives and surfactants to effectively and successfully control the reaction process under the assistance of ultrasonic waves, and the method has the advantages of good reproducibility, high raw material utilization rate and short cycle and is applicable to large-scale production of Sb2Se3 electrode materials.

The invention relates to a preparation method of a vertically oriented graphene-based material. The preparation method comprises following steps: 1, a graphene-based raw material is dispersed in a solvent so as to obtain a graphene-based dispersion liquid; 2, the graphene-based dispersion liquid obtained in step 1 is filtered so as to obtain a graphene-based thin film; and 3, the graphene-based thin film is subjected to rapid freezing and drying so as to obtain the vertically oriented graphene-based material. Compared with the prior art, the preparation method possesses following advantages: the preparation method is capable of controlling vertical orientation of graphene-based derivatives such as oxidized graphene, graphene, and graphene compounds, the electrical conductivity of the obtained graphene-based material is improved obviously, the preparation method and equipment are simple, and large-scale production is convenient to realize.

The invention relates to a solar cell, and provides a method for preparing a polymer thin-film solar cell active layer through electrospinning, wherein by means of the method, full-spray-printing preparation of a donor material layer, a blending layer and an acceptor material layer can be completely at the same time. The method includes the first step of preparing an electrostatic spinning active layer solution, the second step of conducting lap joint on an electrospinning device and conducting preparation before entering a laboratory, the third step of preparing the donor material layer through electrostatic spraying, the fourth step of preparing a nanometer mesh-shaped porous structure of the blending layer through electrospinning, and the fifth step of preparing the blending layer and the acceptor material layer through electrostatic spraying. When the polymer thin-film solar cell active layer is prepared through the electrospinning technology, experimental equipment is simple, operation is convenient, material applicability is high, a prepared nanofiber membrane is high in specific surface area and is of a nanometer mesh-shaped porous structure, high mechanical strength is achieved, the contact area between a donor and an acceptor is greatly enlarged, and safety and circulating performance of the cell are improved.

The invention belongs to the field of polymer materials, biochemical materials and biomedical materials. A method for preparing a natural polymer double-layer microcapsule through the adoption of a gas-liquid micro-channel is characterized by comprising the following steps: assembling natural polymer polyelectrolytes (one is an anion polyelectrolyte sodium carboxymethyl cellulose, and the other is a cation polyelectrolyte chitosan) with opposite charges, and combining with a gas-liquid micro-channel technology to prepare the natural polymer double-layer microcapsule with controllable volume and uniform size. The method is simple in preparation process, the experiment equipment is simple, reaction conditions are mild and easy to control, and the repeatability is good. Each layer of the double-layer microcapsule prepared by the method is provided with a gap so as to respectively embed various substances in different types, such as nanoparticles, medicines, fluorescent substances and biological substances. The method has extremely wide purposes in the biomedical fields such as medicine delivery, controlled release, biological imaging, biological detection and biological marking.

The invention discloses a deep defluorination agent and a preparation method thereof, and belongs to the technical field of chemical materials. According to the technical scheme, the deep defluorination agent is prepared from the following raw materials in weight fraction: 20%-30% of calcium salt, 3%-5% of acid, 10%-15% of ferric salt, 10%-15% of aluminum salt, 2%-3% of magnesium salt, 2%-3% of water glass and the balance water, wherein the ferric salt is nano ferric silicate. Meanwhile, the invention defines a preparation method of the nano iron silicate and the defluorination agent. The nano-scale iron silicate used in the invention has a large specific surface area and can be in good contact with fluorine ions, so that the removal efficiency of the product on fluorine ions in wastewater is improved; and secondly, the preparation method of the raw materials is simple and easy to operate, and industrial production is facilitated.

The invention discloses a preparation method and a using method of a graded hole TiO2 ceramic photocatalyst, and relates to a preparation method and a using method of a photocatalyst. Problems to be solved in the invention are that the TiO2 ceramic photocatalyst capable of removing organic pollutants in wastewater cannot be prepared within 4 hours-6 hours in the existing method, and time for degrading organic pollutants in the wastewater by using the existing TiO2 ceramic photocatalyst is long. The preparation method comprises the following steps of: roasting powder materials, deionized water, a foaming agent, a dispersing agent and a binding agent after mixing, ball-milling, injection-molding and drying to obtain the graded hole TiO2 ceramic photocatalyst. The using method comprises the following step of: adding the graded hole TiO2 ceramic photocatalyst in the wastewater to irradiate under ultraviolet light. The prepared graded hole TiO2 ceramic photocatalyst has characteristic of being short in time of degrading pollutants in the water. The graded hole TiO2 ceramic photocatalyst is used as the photocatalyst for removing the organic pollutants in the wastewater.

The invention provides a method for measuring content of phenolic hydroxyl groups in polyphenyl ether by titrimetry. The method comprises the following steps: dissolving polyphenyl ether to be measured in an organic solvent, adding a reagent, and heating at 0-60 DEG C for 10-30 minutes; and cooling to room temperature, adding de-ionized water, dropwisely adding several drops of phenolphthalein indicator solution, titrating by using a standard potassium hydroxide water solution until pink stays fadeless for 30 seconds, and calculating the content of phenolic hydroxyl groups in polyphenyl ether according to the blank experiment. The method has the advantages of simple experimental apparatus and high measuring accuracy.

The invention relates to a preparation method of a nano ZnO/graphene composite material. The preparation method includes following steps: (1) mixing a nano zinc oxide water solution with a chemically-reduced graphene oxide solution uniformly to prepare a mixture solution, wherein the mass ratio of nano zinc oxide to chemically-reduced graphene oxide is 1-100:1; (2) performing an ultrasound reaction to the mixture solution in an ultrasound instrument to obtain a reaction product; and (3) separating and washing the reaction product to obtain the nano ZnO/graphene composite material. The nano ZnO/graphene composite material is uniform in structure, is excellent in ultraviolet absorption performance, is simple in preparation method and device and is easy to achieve large-scale production.

The invention discloses a tensile strength and break elongation test method of a PVC paste resin glove material. The test method comprises a test piece preparation step and a test piece test step, wherein the test piece preparation step comprises the following steps: (a) mixing raw materials; (b) performing constant-temperature water bath; and (c) forming a test piece. The tensile strength and break elongation test method of the PVC paste resin glove material substitutes a complicated process of a PVC paste resin glove production line, a high-temperature-resistant glass plate is used for substituting a hand mold to prepare the test piece in laboratory, the prepared test piece is similar to the performance of a PVC finished product glove, so that the experimental equipment is simplified, and the material cost and time cost are saved; and important technological instruction data can be provided for manufacturers for manufacturing PVC paste resin powder, and crucial guarantee is provided for improving the technology.

The invention discloses a lamellar macroporous-mesoporous ZnO nano material which is of layered porous lamellar structure and in the form of wurtzite.The material is 10-20 Mum in lamella thickness, 300-600 nm in macropore diameter and 15-30 nm in mesopore diameter; the material is prepared by: using polystyrene-methylmethacrylate-3-sulfopropyl methacrylate potassium spheres as a template and ZnO nanocrystalline as a filler, preparing polystyrene-methylmethacrylate-3-sulfopropyl methacrylate potassium template sphere solution and ZnO nanocrystalline solution respectively, suction filtering layer by layer alternately, and carrying out suction filtering, drying and calcining.The lamellar macroporous-mesoporous ZnO nano material is lamellar, has controllable macropore diameter, good crystallinity and high purity and can avoid nanoparticle aggregation problem; compared with bulk stacked structures, the material enables the utilization rate of its internal material to be effectively increased; the material is applicable to the fields such as photocatalysis and gas-sensitive materials.

The invention discloses a graft modified chitosan microsphere and a preparation method thereof. The preparation method comprises the following steps: using crosslinked chitosan microspheres as a parent body, fully swelling, reacting with a ligand 2-aminobenzothiazole under the action of an initiator, carrying out a grafting reaction, washing after the reaction and drying to obtain the graft modified chitosan microsphere. The invention also provides application of the graft modified chitosan microsphere as a sterilizing agent to drinking water. The graft modified chitosan microsphere is a novel modified sterilizing agent. By introducing or generating a functional group with strong sterilization ability, action effect of solid sterilizing agent and bacteria can be enhanced. The graft modified chitosan microsphere provided by the invention can be recycled, can be used for multiple times and can effectively reduce the ''secondary pollution'', and the utilization ratio of resources can be improved. The invention is in line with China's advocacy of resource conservation and sustainable development and has a wide application prospect.