914results about How to "Increase layer spacing" patented technology

The invention discloses a preparation method of a graphene dispersion liquid. The preparation method of the graphene dispersion liquid comprises the following steps: placing an expanded graphite compacted electrode and a metallic or non-metallic electrode material in an electrolyte solution as an anode and a cathode respectively, and applying a voltage of 1-20V and/or a current having a density of 1-200mA/cm<2> between the anode and the cathode for carrying out an electrochemical reaction for 1-120min; and washing an anode product obtained after the electrochemical reaction, adding to a dispersant, and carrying out ultrasonic or/and mechanical stirring dispersion to obtain the graphene dispersion liquid. The invention also discloses a preparation method of a graphene film. The graphene dispersion liquid forms the graphene film on a substrate in a filter film forming mode or a coating film forming mode or a natural deposition mode. The preparation methods have the advantages of simple process, easy operation, high controllability, low cost and mild reaction condition, and are suitable for the industrialized large-scale production.

The present invention relates to high nitrogen doped corrugated carbon nanotube material and its synthesis process. The synthesis process includes the following steps: mixing Fe source and proper amount of distilled water, soaking porous molecular sieve to carry ferric oxide or ferrous oxide, stoving and roasting at 300-1000 deg.c for 0.5-24 hr to obtain catalyst; setting the catalyst inside a pipe furnace, leading organic amine into the furnace under the protection of Ar or N2 and reacting at 650-1000 deg.c for 0.2-4.0 hr to obtain high nitrogen doped corrugated carbon nanotube mixture containing the catalyst; soaking the mixture in proper amount of or excessive hydrofluoric acid, sulfuric acid, nitric acid or acid for 0.5-24 hr; and washing in distilled water, suction filtering and drying to obtain high nitrogen doped corrugated carbon nanotube material. The material has nitrogen content of 10-40 %, reinforced surface polarity, etc, and is suitable for industrial production.

The invention provides a polyvinyl chloride/organic modified phyllosilicate nanophase composite material and a method for preparing the same. The compositions of the raw materials of the composite material mainly comprise polyvinyl chloride substrates, organic modified phyllosilicates, heat stabilizer, lubricant and processing agent. The composite material is prepared by adoption of the fusing and mixing technology. Compared with a polyvinyl chloride/ phyllosilicate composite material in the prior art, the polyvinyl chloride/organic modified phyllosilicate nanophase composite material provided by the invention obviously improves the toughness, the strength and the modulus of the material and also greatly improves the thermal stability, the dimensional stability, the age resistance and the barrier property. Moreover, the polyvinyl chloride/organic modified phyllosilicate nanophase composite material also has good flame-retarding and smoke-inhibiting properties. The polyvinyl chloride/organic modified phyllosilicate nanophase composite material has simple manufacturing technique, convenient operation and control, stable quality, high production efficiency, low production cost, wide application range and wide industrialization and market prospect.

A preparation method of a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material includes: (1) etching Ti₃AlC2 with LiF/HCl to prepare two-dimensional transition metal carbide nanosheet; (2) preparing a nanosheet aggregate by electrostatic self-assembly of a two-dimensional transition metal carbide nanosheet and a positively charged nitrogen-containing cationic compound; (3) calcining the nanosheet aggregates to prepare a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material. A method for degrading and removing organic pollutants in water includes (1) etching Ti₃AlC₂ with LiF/HCl to prepare two-dimensional transition metal carbide nanosheet; (2) preparing a nanosheet aggregate by electrostatic self-assembly of a two-dimensional transition metal carbide nanosheet and a positively charged nitrogen-containing cationic compound; (3) calcining the nanosheet aggregates to prepare a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material; (4) placing the two-dimensional nitrogen-doped carbon-based titanium dioxide composite material into water containing organic pollutants to degrade and remove organic pollutants in water.

The invention relates to a nucleating agent and a method for preparing the nucleating agent, wherein the nucleating agent is used for reducing the dimension of the foaming hole and improving the density of the foaming hole when a supercritical fluid foaming agent (such as carbon dioxide or nitrogen) is used for producing thermoplastic foaming products. The raw materials of the nucleating agent mainly consists of an organic montmorillonite, a thermoplastic resin and a supercritical fluid foaming agent; the specific weight of the nucleating agent master batches is controlled within 100+/-5% of that of the thermoplastic resin. The method has the advantages that a supercritical fluid foaming method is adopted to prepare the nucleating agent master batches which have approximate specific weights to the resin material adopted by the subsequent foam forming, thus facilitating the subsequent injection foam forming and extrusion foam forming; and the carbon dioxide or nitrogen in supercritical state is used for reducing the viscosity of the carrier resin during the mixing process, the dispersion uniformity of the peeled sandwich montmorillonite in the carrier resin is reinforced, the process temperature is reduced, the layer spacing of the sandwich nano-montmorillonite which may be not peeled is increased and the sufficient peeling is realized.

The invention discloses a method for preparing a polyamide-amine in-situ intercalation graphene composite material. The method comprises the following steps of: (1) dispersing graphite in an imidazole-compound-containing organic solvent with ultrasonic, and centrifuging to obtain multi-layer graphene suspension; and (2) polymerizing to generate polyamide-amine in the multilayer graphene by adopting an in-situ polymerization method to prepare the polyamide-amine in-situ intercalation graphene composite material. According to the method, natural graphite is directly subjected to ultrasonic exfoliation in the organic solvent to obtain single-layer or multi-layer graphene suspension, the original sp2 structure of the graphene is slightly damaged because an oxidation step is not carried out, the polyamide-amine in-situ intercalation graphene composite material is prepared by using an in-situ polymerization method, so that graphene laminas are spread, interlamellar spacings are enlarged, the polyamide-amine on the surface of the graphene functionally prevents agglomeration of the graphene laminas, the graphene laminas are uniformly dispersed, and the product has good stability and is hardly precipitated.

The invention relates to an ultraviolet light solidified acrylate / modified montmorillonite nanometre composite material and preparation method thereof, comprising montmorillonite being subjected to cation exchange modifying using longchain alkyl quaternary ammonium salts; extending the distance between the montmorillonite layers and improving the chemistry microenvironment; the surface hydroxy group of the montmorillonite being decorated using acrylate modifier with carbimide group and grafted with a large amount of acrylate groups of high response to further extend the interlayer distance; finally mixing the decorated montmorillonite, acrylate monomer, acrylate oligomer and ultraviolet light initiator to produce the ultraviolet light solidified acrylate / modified montmorillonite nanometre composite material. The method is simply and easily operated to realize high delamination and good dispersion pf montmorillonite in polymer substrate. Compared with the pure acrylate material, the material of the invention has greatly improved mechanical property and thermal endurance, with high intension after ultraviolet light solidifying, high hardness, good thermal stability and wide industrial application foreground.

The invention discloses a preparation method for a single-layer graphite-type carbon nitride nanosheet solution. The preparation method comprises the following steps: selecting tripolycyanamide or urea or bipolydicyanamide as a precursor, and performing pyrolytic reaction to obtain graphite-type carbon nitride powder; weighing carbon nitride powder, putting the carbon nitride powder into a ball milling jar with an aqueous solution of a polar solvent or a surfactant, and putting into a jar mill for ball milling; after ball milling for a certain time, pouring out a suspension, performing ultrasonic exfoliation by using an ultrasonic dispersion instrument, and centrifuging the obtained solution; taking a supernatant, namely the single-layer graphite-type carbon nitride nanosheet solution. Compared with the prior art that the single-layer graphite-type carbon nitride nanosheet solution is obtained by using a high-power ultrasonic exfoliation instrument, the preparation method provided by the invention has the advantages as follows: after ball milling pretreatment, the ultrasonic exfoliation on the carbon nitride powder is carried out, so that energy consumption is lower in the preparation process, and the prepared graphite-type carbon nitride nanosheet solution is higher in concentration and relatively low in cost.

The invention discloses a method for preparing graphene through a liquid-phase stripping method. The preparation method comprises the following steps: S1, performing expanding treatment on a graphite raw material through an expanding method; S2, dispersing the expanded graphite into an aqueous solution containing a surfactant to obtain a mixture, performing ultrasonic treatment on the mixture, centrifuging the mixture, and drying the mixture for later use; S3, adding the dried graphite into an organic solvent, a mixed solution of an organic solvent and a surfactant or a mixed solution of an organic solvent and substances with surface energy similar to that of the graphene, performing ultrasonic treatment and suction filtration, drying, and repeating the step S3 for 1-10 times, thereby obtaining graphene. Compared with the prior art, the method disclosed by the invention can be used for greatly shortening the ultrasonic treatment time, improving the stripping efficiency and obtaining high-quality graphene under low-power ultrasonic treatment.

The invention provides a high-performance water system zinc ion battery anode material, a manufacturing method and an application thereof. The anode material has the following general formula: (N,M) sigma=1V8O20 nH2O, wherein the N is one of Li, Na, K, Zn, Cu, Mg or Ca, the M is one of Mn, Fe, Co or Ni, and the n is 0.01-4. The anode material can be manufactured through one-step hydrothermal method, a reaction condition is mild, a manufacturing process is simple, and a requirement to equipment is low. A microscopic morphology of the obtained anode material is a nanobelt. The obtained anode material is firstly applied to a water system zinc ion battery, and has electrochemical performance such as a higher specific discharge capacity, a higher cycle stability and the like.

The invention discloses a MoS2 inserted-layer Ti3C2 lithium ion battery negative electrode material and a preparation method thereof. A MoS2 inserted-layer Ti3C2 composite material is prepared by taking titanium aluminum carbide as a main raw material and employing different molybdenum sources and sulfur sources, and the mass percent of MoS2 after combination accounts for 1-50%. The initial discharge specific capacity of the MoS2 inserted-layer Ti3C2 lithium ion battery negative electrode material is 604.2mAh/g under 50mA/g, the capacity of a product is 153.3mAh/g under 500mA/g after circulation of 50 times, the interlayer distance is 1.2346 nanometers, the capacity is obviously improved, the interlayer distance is remarkably extended, and the preparation method is a modified method which is simple in process and low in cost, and is suitable for industrial production.

The invention relates to an ultra-hydrophilic-superoleophobic reduced graphene oxide filtering membrane and use, and belongs to the technical field of separation membrane preparation. First, grapheneoxide and nano-zinc oxide are added to distilled water and ultrasonically dispersed; a dopamine solution containing dopamine hydrochloride is added and mechanically stirred; the mixed solution is thensuction-filtered and deposited onto the surface of a mixed cellulose ester membrane by vacuum suction filtration, and the ultra-hydrophilic-underwater superoleophobic unsupported reduced graphene oxide filtering membrane is obtained by drying and self falling. The reduced graphene oxide membrane has the advantages of high water permeation selectivity, flux and stability, and membrane pollution resistance, can effectively separate oily wastewater, provides an efficient, environmentally friendly and economic technical means, and has important practical significance.

The invention discloses anti-seepage, anti-freeze-thaw self-compacting concrete and a preparation method thereof. The anti-seepage, anti-freeze-thaw self-compacting concrete comprises the following components in parts by weight: 350-370 parts of cement, 25-45 parts of fly ash, 25-35 parts of modified metakaolin, 30-50 parts of mineral powder, 770-800 parts of medium sand, 810-830 parts of crushedstone, 20-40 parts of silica fume, 170-180 parts of water, 1-3 parts of a water reducing agent, 20-34 parts of an expansion agent, 2-6 parts of an air entraining agent, and 10-20 parts of a fiber composition, wherein the fiber composition is prepared by mixing a modified polyester fiber, a basalt fiber and a polyacrylonitrile fiber in a mass ratio of 1:0.6-0.9:0.3-0.6. The anti-seepage, anti-freeze-thaw self-compacting concrete has the advantages of good workability and fluidity, and excellent anti-seepage performance and anti-freezing performance.

The invention relates to a compound modification method for clay, which comprises the following steps: dissolving 0.5-2g of silane coupling agent in a certain amount of alcohol-water mixture, and stirring for a certain time on a magnetic stirrer; adding a certain amount of clay into a stirring furnace, performing high-speed stirring at a certain temperature, and meanwhile, adding the alcohol-water mixture into the clay within a certain time; after the alcohol-water mixture is added, continuing to stir for 0.5 hour, pouring out, and performing heat treatment at 80-200 DEG C for 1-3 hours; and mixing the product obtained in the previous step with a certain amount of long-chain alkyl ammonium salt water solution, adding a small amount of acetic acid to regulate the pH value to 2-5, stirring at a certain temperature for a certain time, repeatedly performing vacuum filtration 2-5 times, and performing heat treatment at 80-200 DEG C for 2-5 hours. Secondary modification takes full advantages of the synergic modification effects of the silane coupling agent and the long-chain alkyl ammonium salt, enlarges the molecular layer interval of the clay, increases the affinity of the clay to polymer and widens the application range of the clay.

The invention discloses a preparation method and application of a potassium-doped carbon nitride photocatalyst. The method comprises steps as follows: ammonium chloride, dicyandiamide and potassium nitrate are mixed, and the mixture is heated to 500-600 DEG C and then kept at the constant temperature for 3-6 h; the mixture is naturally cooled to the room temperature after calcination ends, and thepotassium-doped carbon nitride photocatalyst can be obtained. The potassium-doped carbon nitride photocatalyst is used for photocatalytic decomposition of organic matter. The prepared photocatalyst has larger interlayer spacing and specific surface area and excellent photocatalytic activity, the degradation efficiency is two times or more that of pure carbon nitride in the degradation experimentof the organic matter, and the preparation method is simple and feasible, has lower requirements for experiment facilities and can save the preparation cost to the greatest extent.

The invention discloses a novel RGO/MXene composite film and a preparation method thereof, and the method comprises the following steps: carrying out reduction processing on GO through DA to prepare RGO; stripping MAX by using a LiF and HCl mixed solution to obtain a two-dimensional MXene material with a clear lamellar structure; ultrasonically mixing an MXene dispersion solution and an RGO dispersion solution, constructing the RGO/MXene composite film on a PVDF film substrate in a vacuum filtration manner, and applying the RGO/MXene composite film to processing of industrial wastewater. According to the method, the synergistic film-forming mechanism and the separation mechanism of the RGO and the MXene are explored in detail, and some reference significance is provided for further widening the application range of the MXene and developing and constructing more novel high-performance film materials. From the perspective of improvement of the structure of the film material, the processing efficiency and the recyclability of the film are improved, and finally the practical purpose of reducing the industrial wastewater processing cost is achieved.

The invention provides a transition metal chalcogenide nanosheet material and a preparation method thereof, a battery anode material, a secondary battery and an application thereof, and belongs to thetechnical field of transition metal chalcogenides. The invention provides a preparation method of a transition metal chalcogenide nanosheet material, comprising the following steps: dissolving raw materials in an aqueous solution of soluble salt, removing moisture to obtain a solid, sintering the solid, and washing to obtain a transition metal chalcogenide nanosheet material, wherein the raw materials include a chalcogen precursor and a transition metal precursor. According to the preparation method, the soluble salt is used as a template, is inexpensive, is environmentally friendly and is easy to remove in post-treatment, and the obtained transition metal chalcogenide nanosheet material has a thinner sheet thickness. Compared with a traditional silica template method or a hydrothermal method, the preparation method of the invention greatly shortens the synthesis cycle, is simple and feasible, is controllable, has characteristics of high yield and simple experimental operation, and issuitable for large-scale production.

The invention provides a preparation method of an MXene nanofiltration membrane. A series of MAX materials is etched by adopting ammonium hydrofluoric acid to obtain an MXene blocked material, the massive MXene is decomposed into small nanosheets by virtue of a vapor striping method, then the single-wall carbon nanotube is embedded into MXene nanosheet layers by adopting a solution intercalation method, and then a novel MXene nanofiltration membrane is prepared by virtue of a vacuum suction filtration means. The MXene nanofiltration membrane obtained in the invention is high in flux and interception characteristics.

The invention relates to mesoporous activated carbon and a preparation method thereof. The technical proposal of the invention comprises the following steps: firstly, high sulfate bituminous coal or high sulfur content petroleum fluid coke are taken as raw materials, KOH is taken as an activating agent, the mass ratio of alkali to coal or the mass ratio of alkali to coke is 1.0-5.0:1, the adjustment of a carbon microcrystalline structure is performed in nitrogen atmosphere at a temperature of between 250 and 400 DEG C, the adjustment time is between 0.5 and 5 hours, and then the preheating treatment is performed for 1 to 5 hours at a temperature of between 400 and 700 DEG C to obtain an amorphous carbon stock; then the prepared amorphous carbon stock is subjected to activating treatment for 0.5 to 5 hours at a temperature of between 800 and 950 DEG C; and carbide after the activating treatment is acid-cleaned, water-scrubbed and dried to obtain the mesoporous activated carbon. The method has the characteristics of simple process, higher yield and productivity, low preparation cost and so on. Mesopores of the mesoporous activated carbon have large specific surface area, the mesopore area exceeds 60 percent of the mesoporous activated carbon, and the mesopore volume is high.