34results about How to "Uniform microscopic morphology" patented technology

The invention relates to a permeable type asphalt regenerant and a preparation method thereof, belonging to the technical field of resource environmental chemistry. By virtue of a surfactant, aged asphalt can be rapidly moisturized through the regenerant, the blending of basic components in the aged asphalt can be realized through higher content of aromatics in the regenerant, oil in waste oil hasbetter permeability and lubrication to the aged asphalt, thus being beneficial to interaction of macromolecules and further increasing the plasticity of the asphalt; the polar groups in epoxidized soybean oil and dibutyl phthalate have chemical reaction with asphaltene to weaken the strong attraction between asphaltene molecules, so that the agglomerated asphaltene in the aged asphalt is evenly dissolved and dispersed in the asphalt colloid system again, and a spatial network structure formed due to agglomeration of asphaltene is destructed to weaken the barrier of the spatial network structure on the permeation of the regenerant, so that the permeation capability of the regenerant is improved, and the colloid structure and performances of the aged asphalt can be effectively restored.

The invention relates to the field of new-type flexible electrode materials and in particular to a two-dimensional nitrogen-doped porous carbon nanosheet and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a carbon nanosheet: performing first calcining on a carbon material in protection of an inert gas, cooling, and preparing the carbon nanosheet;(2) preparing a porous carbon nanosheet: adding the carbon nanosheet to oxidized acidic solution and performing an oxidation reaction, preparing the porous carbon nanosheet; and (3) preparing the two-dimensional nitrogen-doped porous carbon nanosheet: adding the porous carbon nanosheet and a surfactant to water, uniformly dispersing, adding a nitrogen-doped material, dissolving, uniformly mixing,after drying, grinding to obtain mixture powder, and performing second calcining on the mixture powder in the protection of the inert gas, cooling, and preparing the two-dimensional nitrogen-doped porous carbon nanosheet. The prepared two-dimensional nitrogen-doped porous carbon nanosheet has uniform porosity, good energy storage performance and circulation stability.

The invention discloses a preparation method of a modified manganese oxide material for lithium ion battery positive pole materials, which comprises the following steps: 1. preparing manganese source compound and aluminum salt in a mol ratio of 39:1-9:1 into a 0.2-0.5 mol/L water solution, independently preparing carbonate into a 0.2-0.5 mol/L water solution, reacting the two solutions for 4-8 hours by a coprecipiation process while controlling the temperature of the two solutions at -5-10 DEG C, gradually heating to 80-100 DEG C to react for 4-8 hours, filtering, and drying to obtain aluminum-doped precursor manganese carbonate powder; and 2. calcining the obtained precursor manganese carbonate powder at 600-800 DEG C for 2-5 hours to obtain the spherical-ion pore-structure modified manganese oxide of which the particle size is 1-3 mu m. The preparation method disclosed by the invention has the advantages of cheap and accessible raw materials, uniform microstructure and favorable doping effect, and has an auxiliary function on the subsequent synthetic structure of the lithium ion battery positive pole material.

The invention provides a NiAl/WC composite with the high-temperature wear resistance and a preparation method of the composite. The composite is prepared from raw materials including Ni powder, Al powder and WC powder; the mole ratio of the Ni powder to the Al powder is 1:1; the mass of the WC powder accounts for 5wt%-40wt% of the total mass of Ni-Al-WC mixed powder; the Ni powder has the particle size ranging from 100 meshes to 300 meshes and the purity ranging from 95%-99.5%; the Al powder has the particle size ranging from 100 meshes to 300 meshes and the purity ranging from 95%-99.5%; and the WC powder has the particle size ranging from 100 meshes to 300 meshes and the purity ranging from 95%-99.5%. With the preparation method, high-temperature sintering is not required, so that the obtained composite is uniform in structure, free of pores and high in stability.

The invention belongs to the technical field of compound aerogel, and in particular relates to a carbon-black-filled polyimide-based compound aerogel material and a preparation method thereof. The compound aerogel is prepared from the following raw materials: one or more water-soluble polyimide precursor-polyamide acids and one or more carbon black. The preparation method comprises the steps of preparing oxidized carbon black dispersion liquid; preparing polyamide acid-oxidized carbon black hydrogel by means of a sol-gel process; preparing polyamide acid-oxidized carbon black aerogel by means of freeze drying; preparing polyimide-carbon black compound aerogel by means of hot imidization. The raw materials for preparing the polyimide-based compound aerogel are low-cost, and the preparation method is simple and easy to implement; the prepared compound aerogel is uniform in micro-morphology. Furthermore, the prepared polyimide-based compound aerogel has excellent mechanical strength and heat resistance, and a lower dielectric constant, thus being an ideal high-temperature dielectric material.

The invention relates to the technical field of nanomaterial preparation, in particular to a preparation method of a manganese dioxide nanowire. The preparation method includes the following steps that potassium permanganate is dissolved in water, an inorganic alkali solution is added, a mixed aqueous solution is formed, the mixed aqueous solution is placed and aged for a period of time, and sol-gel is generated; the sol-gel is stirred and dispersed, inorganic acid is dripped, and the inorganic acid and the sol-gel are fully mixed; the mixture is placed in a hydrothermal reaction kettle and subjected to a hydrothermal reaction for a period of time at a certain temperature; precipitate generated in the reaction is washed and dried, and the manganese dioxide nanowire is obtained. Compared with the prior art, the preparation method has the advantages that the process is simple, operation is easy, few kinds of reagents are needed, reaction conditions are mild, cost is low, and environmental friendliness and cleanliness are achieved, and can be applied to industrialized mass production; the obtained manganese dioxide nanowire is small in size, uniform in microtopography and high in purity and can be applied to the fields of supercapacitors, sensors, environmental pollution remediation and the like.

The invention discloses a preparation method of a flexible carbon/lanthanum ferrite composite fiber membrane material. The method comprises the following steps of dissolving inorganic ferric salt, lanthanum salt and a filament forming agent in a solvent to obtain a precursor solution; carrying out electrospinning on the precursor solution through an electrospinning technology, and obtaining a carbon/lanthanum ferrite composite precursor fiber membrane with uniform thickness through a roller collector; and annealing the carbon/lanthanum ferrite composite precursor fiber membrane in a nitrogen atmosphere to obtain the flexible carbon/lanthanum ferrite composite fiber membrane material. According to the preparation method, the carbon/lanthanum ferrite precursor fiber membrane material is obtained mainly through the electrostatic spinning technology; the flexible carbon/lanthanum ferrite composite fiber membrane is obtained by controlling the heat treatment atmosphere and the annealing condition; by the method, the preparation process of the carbon/lanthanum ferrite composite fiber membrane is simplified, and the obtained fiber membrane has certain flexibility; in the whole preparation process, raw materials are easy to obtain, the process is simple, and the cost is low; and the universality is very high.

The invention discloses a perovskite quantum dot and a preparation method thereof. The method comprises the steps of: mixing a cesium salt, organic phosphine, a poor solvent and organic amine evenly in an inert atmosphere to obtain a cesium precursor solution; mixing a lead salt, organic phosphine, a poor solvent and organic amine evenly in an inert atmosphere to obtain a lead precursor solution;mixing the cesium precursor solution with the lead precursor solution evenly in an inert atmosphere for nucleation reaction of the cesium ions, lead ions and halide ions dissolved out from the mixed precursor solution to obtain CsPbX3 perovskite quantum dots, the surfaces of which are combined with organic amine, wherein X is Cl, Br or I. Specifically, at least one of the cesium salt and the leadsalt is a metal halide. The CsPbX3 perovskite quantum dot material synthesized by the method has uniform micro-morphology and particle size, high luminescence purity and good batch-to-batch stability,thus being beneficial to application of the material in lighting, photoelectric display and photovoltaic fields.

The invention provides a pretreatment method of polysilicon film texturing for cutting a solar cell by a diamond wire saw. The method is characterized in that the a diamond wire saw cutting polysilicon silicon is heated to 500 to 1000 DEG C, the temperature is maintained for 0.5 to 6 hours, and then the temperature of the diamond wire saw cutting polysilicon silicon is slowly and naturally reduced to be under 100 DEG C. According to the method, the diamond wire saw cutting polysilicon silicon is suitable for conventional wet method texturing, the average surface light reflection rate is reduced to a level of 20% to 23%, as shown in Table 1; the texturing surface micro morphology is uniform and round and is not distributed along cutting lines, the cutting mark appearance is reduced remarkably, the processing process is simple, the cost is low, and the method is suitable for large-scale production and application.

The invention belongs to the technical field of preparation of lithium ion battery electrode materials, and particularly relates to a ZIF-8-derived lithium ion negative electrode material and a preparation method thereof, and the material is prepared by a simple coprecipitation method and a heat treatment process. The preparation method provided by the invention has the advantages of being simple and easy to operate, high in material yield, high in rate, stable in structure, large in particle dispersion coefficient, low in cost, green, environment-friendly and the like, and the obtained ZIF-8-derived lithium ion battery negative electrode material is uniform and controllable in morphology, free of agglomeration phenomenon, large in specific surface area, rich in central active sites, and suitable for industrial production. And when being used as an electrode material, the composite material shows relatively high specific discharge capacity and electrochemical characteristics, and can meet the requirements of preparing a high-performance lithium ion battery electrode material.

The invention discloses a rare-earth luminescent nano-material based on an aggregation induction effect as well as a preparation method and application thereof. The rare-earth luminescent nano-material based on the aggregation induction effect, disclosed by the invention, is a novel rare-earth luminescent and aggregation induction effect (AIE) luminescent coexisting material; the material has a uniform microstructure and the grain diameter of grains is about 32.16nm; the preparation method disclosed by the invention is simple, and an oleophylic rare-earth europium complex luminescent componentand a compound A are introduced and the rare-earth luminescent component is covered with by nanoparticles through a co-assembly method; an aldehyde group on the surface can react with amino with polyethylenimine so that the component can be modified onto the surfaces of the particles; the material has strong dispersity in water; the rare-earth luminescent nano-material based on the aggregation induction effect has a ratio fluorescence detection behavior on hydrogen ions. Furthermore, a detection process can be circularly repeatedly used for at least 10 times through simply regulating the pH (Potential of Hydrogen) value of the solution; the rare-earth luminescent nano-material can be potentially applied to the fields including environment acidity detection, cell acid-base imaging and thelike.

The invention relates to a preparation method of a strong corrosion-resistant magnesium alloy biological composite material, and belongs to the technical field of biological materials. The technical scheme comprises that a blue algae material is effectively cultured by coating the surface of a magnesium alloy with the blue algae material; the surface of the material is effectively coated by nanoparticles formed after calcination, the surface of calcined carbon black has a large number of oxygen-containing functional groups, the surface of the carbon black is allowed to show negative electricity, a HA (hydroxyapatite) phase is promoted to be precipitated and separated out from a solution in a mineralization process, and a hydroxyapatite composite carbon black coating layer is formed. Therefore, the coated carbon black coating layer can promote the uniform growth of hydroxyapatite, flaky crystals with fine morphology and size are obtained, the micro-morphology of the composite coating layer is more uniform and compact, and the gaps between the flaky hydroxyapatite crystals are much less than the gaps of a coating layer coated by a single layer, so the coating layer shows good corrosion resistance, and can effectively improve the corrosion resistance and use aging performance of magnesium alloy materials.