175 results about "Spherical morphology" patented technology

The invention disclosed relates to porous carbon of spherical morphology having tuned porosity and to a method of making same, comprising: (a) providing a precursor solution, by combining in an aqueous solution a colloidal silica template material and a water-soluble pyrolyzable carbon source, wherein the particle size of the colloidal silica template and the colloidal silica/carbon source weight ratio are controlled, (b) atomizing the precursor solution into small droplets by ultrasonic spray pyrolysis (c) directing the droplets into a high temperature furnace operating at a temperature of 700-1200° C., under an inert gas atmosphere, where the droplets are transformed into solid spherical composite carbon/silica particles, (d) collecting the resulting composite carbon/silica particles exiting from the furnace, and (e) removing the silica from the particles, to provide substantially pure porous carbon of spherical morphology having tuned porosity defined by surface area and pore size. The porous carbon according to the invention is used as catalyst supports in PEM fuel cells, as electrodes in supercapacitors and lithium in batteries, for hydrogen storage and as earners for drug delivering.

Nickel powder batches and methods for producing nickel powder batches. The powder batches include particles having a small particle size, narrow size distribution and a spherical morphology. The present invention is also directed to devices incorporating the nickel metal powders.

The invention discloses a method for degrading organic waste water by photo-assisted activation of potassium hydrogen persulfate through bismuth ferrite, belonging to the technical field of waste water treatment. A perovskite structure BiFeO3 in the invention has a spherical morphology and is prepared by adding a certain amount of a surface active agent under hydrothermal conditions; the specific surface area is high; and the prepared BiFeO3 self can degrade organic pollutants by photocatalysis under the irradiation of visible light. According to the method disclosed by the invention, BiFeO3 is applied to degrading the organic pollutants by activating potassium hydrogen persulfate; the methyl orange degradation rate within 15 min is 94%; the methyl blue degradation rate within 40 min is 90%; the rhodamine degradation rate within 40 min is 65%; by means of combined use of BiFeO3 and potassium hydrogen persulfate, the organic pollutants are oxidized and degraded; the organic pollutants can be effectively degraded under better illumination conditions; the organic pollutants can also be effectively oxidized and degraded without light or under poor illumination conditions; and therefore, the method has good application prospect.

A zirconia-containing composition and processes for synthesizing same. The composition comprises least about 99.9 percent tetragonal phase zirconia, based on the total crystalline zirconia in the zirconia-containing composition as determined by x-ray diffraction (XRD). The composition also has a substantially spherical morphology and comprises less than 100 wppm chlorine, based on the total weight of the zirconia-containing composition. The zirconia-containing composition has an average surface area of at least 80 m²/g and an average particle size of less than about 10 microns.

The invention provides a nickel cobalt manganese hydroxide precursor represented by a general formula (I). The hydroxide precursor is an orderly accumulated sphere with a page-like structure composed of a plurality of layers of sheets. The invention further provides a preparation method of the nickel cobalt manganese hydroxide precursor. In the process of preparing the nickel cobalt manganese hydroxide precursor, a sodium hydroxide solution, an ammonia water solution and a mixed solution of nickel salt, cobalt salt and manganese salt are reacted; and the nickel cobalt manganese hydroxide precursor which is the orderly accumulated sphere with the page-like structure is obtained by controlling pH and the amount of the ammonia water solution in the reaction process and adding an additive for adjusting particle morphology in the reaction process at the same time. The experimental results show that the nickel cobalt manganese hydroxide precursor prepared by the invention has better spherical morphology, uniform particle and good particle mobility; therefore, the nickel cobalt manganese hydroxide precursor is beneficial to diffusing lithium ion in the subsequent sintering process.

Copper metal powders, methods for producing copper metal powders and products incorporating the powders. The copper metal powders have a small particle size, narrow size distribution and a spherical morphology. The method includes forming the metal particles in a continuous manner.

The invention provides a magnetic iron oxide-silicon dioxide-phenolic resin polymer composite nanometer material with a core-shell structure, a preparation method and application of the composite nanometer material. The material has a regular spherical morphology; an inner core is magnetic iron oxide nano particles; an inner shell layer is silicon dioxide; an outer shell layer is a phenolic resin polymer; the thicknesses of the inner shell layer and the outer shell layer can be modulated; the outer shell layer can be transformed into carbon after high-temperature treatment in nitrogen; and the overall morphology and the structure of the material are kept invariable. The material is prepared by the following steps: introducing magnetic iron oxide nano particles into a mixed solution of ethyl alcohol/deionized water/ammonium hydroxide; and adding a silicon source and a carbon source to carry out hydrolysis and polymerization reaction. The magnetic iron oxide-silicon dioxide-phenolic resin polymer composite nanometer material has the effects and advantages that the provided core-shell material is good in stability and simple in preparation process, and can be used for adsorbing and separating a nano noble-metal catalyst carrier.

Chemical-mechanical planarization slurries and methods for using the slurries wherein the slurry includes abrasive particles. The abrasive particles have a small particle size, narrow size distribution and a spherical morphology and the particles are substantially unagglomerated.

The present invention relates to the self-assembly of a spherical-morphology block copolymer into V-shaped grooves of a substrate. Although spherical morphology block copolymers typically form a body-centered cubic system (bcc) sphere array in bulk, the V-shaped grooves promote the formation of a face-centered cubic system (fcc) sphere array that is well ordered. In one embodiment, the (111) planes of the fcc sphere array are parallel to the angled side walls of the V-shaped groove. The (100) plane of the fcc sphere array is parallel to the top surface of the substrate, and may show a square symmetry among adjacent spheres. This square symmetry is unlike the hexagonal symmetry seen in monolayers of spherical domains and is a useful geometry for lithography applications, especially those used in semiconductor applications.

Disclosed is a preparation method of a hollow manganese oxide nanosphere of large specific surface area, comprising steps of preparing a silicon dioxide nanosphere, preparing a silicon dioxide composite nanosphere covered by manganese dioxide and preparing hollow manganese oxide nanosphere. Because the preparation method adopts the process steps, which are simple, the production cost is low; the prepared hollow manganese oxide nanosphere is tested by an X-ray diffraction instrument, a scanning electron microscope, a transmission electron microscope, a Fourier transform infrared spectrometer and a physisorption instrument; the hollow manganese oxide nanosphere belongs to natrium-manganese crystal phase and is characterized by spherical morphology, having particle sizes ranging from 300 to 450nm and large specific surface area, and can be used as electrode materials to produce electrochemical capacitors.

The invention discloses a composite lithium iron phosphate/carbon coated core-shell type lithium ferric manganese phosphate anode material. The constituent general formula of the composite lithium iron phosphate/carbon coated core-shell type lithium ferric manganese phosphate anode material is LiMnxFe1-xPO4/LiMnyFe1-yPO4/LiFePO4/C, wherein the constituent general formula of a core material is LiMnxFe1-xPO4, the constituent general formula of a shell material is LiMnyFe1-yPO4, the constituent general formula of a coating layer material is LiFePO4/C, and x is greater than or equal to 0.8 but is smaller than or equal to 0.9, and y is greater than or equal to 0.2 but is smaller than or equal to 0.4. In addition, the core material accounts for 60-80% by weight of lithium iron phosphate, and the carbon in the coating layer material accounts for 2-3% by weight of lithium iron phosphate. Core-shell type lithium ferric manganese phosphate particles are obtained by adopting a coprecipitation method and a hydrothermal method and then are mixed with a lithium source, an iron source, a phosphorus source and a carbon source to perform hydrothermal reaction so as to obtain a target product. The product particles prepared by adopting the method are regular in spherical morphology, the dissolution of manganese in the anode material is greatly reduced, and the cycle performance of a battery is remarkably improved.

The invention discloses an octave type short coherence transient phase-shifting interferometer and a measurement method used for detecting spherical topographic characteristics and relates to the technical field of optical detection. The problems that a traditional time domain phase-shifting interference measurement device is narrow in detection range and low in measurement precision and is influenced by environmental factors are solved. The interferometer comprises a short coherence laser, a spatial filter, a beam splitter prism, an optical fiber coupling mirror, a polarization splitting prism, a lambda/4 wave plate, a 4f beam-expanding system, a micro objective, a plane mirror, a single mode optical fiber, an optical fiber collimating lens, a corner cube mirror, a cube-corner prism, a lambda/2 wave plate, a polarization splitting prism, a first parallel beam splitter, a second parallel beam splitter, a wave plate group, a polarizing film, an area array charge coupled device (CCD) and a computer. A positioning relationship among four interference images is obtained through four interference patterns of the area array CCD through the computer, so that the initial phase difference which corresponds to each pixel point in an interference field is solved, the optical path difference is further solved, and the spherical morphology is measured. The interferometer is suitable for detection of spherical topographic characteristics.

The invention discloses a W-containing high-nickel ternary positive electrode material. The high-nickel ternary positive electrode material comprises spherical morphology secondary particles and monocrystalline morphology particles at the same time, the monocrystalline morphology particles basically do not contain W element, and the spherical morphology secondary particles are doped with W element; the preparation method comprises the following steps: mixing a nickel salt, a cobalt salt and a manganese salt according to a molar ratio, and adding ammonia water and a sodium hydroxide solution for coprecipitation to prepare a precursor A; mixing a nickel salt, a cobalt salt, a manganese salt and a tungsten salt, and preparing a precursor B containing a tungsten element through co-precipitation of ammonia water and a sodium hydroxide solution; and mixing the precursor A, the precursor B, a lithium source and a compound containing a doped element M, and carrying out high-temperature sintering in an aerobic atmosphere to obtain the high-nickel ternary positive electrode material simultaneously containing spherical secondary particles and single-crystal particles. The secondary sphericalparticles in a product can increase the capacity, and meanwhile, a crystal structure cannot generate obvious phase change during lithium ion deintercalation in the cycle process, so that the cycle performance is favorably improved.

The present invention provides a core / shell-type micropore /mesoporous composite titanium silicon molecular sieve and a preparation method thereof. The composite molecular sieve has a nearly spherical morphology, a specific surface area of 500-700m<2> / g, and a typical core-shell structure, an inner core is microporous titanium silicon molecular sieve TS-1 with a diameter of 200-300nm, an outer shell layer is hexagonal ordered mesoporous titanium-containing silica with the aperture of 2-3nm, a gap is between the inner core and the outer shell, and gap size and outer shell thickness both can be modulated. The composite molecular sieve is prepared by a two-step process, and the microporous titanium silicon molecular sieve TS-1 is first coated with a phenolic resin polymer as a hard template, and then coated with the mesoporous titanium-containing silica. The effects and benefits are as follows: the composite molecular sieve has multi levels of channels, the hollow core-shell structure is conducive to diffusion of guest molecules, and has good use prospects in catalysis, adsorption and separation and other fields, and the preparation process is simple, efficient and highly controllable.

The invention provides hollow core-shell type magnetic mesoporous carbon nitride and a preparation method thereof. The preparation method comprises the steps: taking magnetic mesoporous silica spheres having a double-layer core-shell structure as a template, placing the magnetic mesoporous silica spheres in an aqueous solution of a carbon nitrogen precursor, fully impregnating, carrying out vacuum drying, calcining in a nitrogen atmosphere, and dissolving silica by using a sodium hydroxide solution, to obtain the magnetic mesoporous carbon nitride with the hollow core-shell structure. The material has a spherical morphology, has the specific surface area of 20-200 m<2>/g and has the typical core-shell structure; an inner core is magnetic iron oxide microspheres with the diameter of 100-400 nm, an outer shell layer is hollow mesoporous carbon nitride, the pore size of mesopores is 2-8 nm, the cavity diameter is 140-600 nm, and the thickness is 20-100 nm. The hollow core-shell type magnetic mesoporous carbon nitride has the effects and the advantages that a novel multi-functional composite material is provided and has good application prospects in the fields of catalysis, adsorption and separation, environmental purification and the like.

The invention provides a preparation method of uniform-size spherical yttrium-stabilized zirconia nano powder. The method is characterized by comprising the following steps: making a zirconium source and a yttrium source into a solution; adding a precipitant into the solution; stirring sufficiently and adding a dispersing agent; putting the mixed solution into a reaction kettle; stirring at room temperature, and heating for reacting for a period of time to obtain a product; washing the product with water and ethanol; performing freeze drying to obtain semi-stable nano-scale yttrium-stabilized zirconium; and performing thermal stabilization treatment to obtain spherical yttrium-stabilized zirconia nano powder. The method provided by the invention has the following advantages: the prepared yttrium-stabilized zirconia nano powder is of uniform size distribution, spherical morphology and high crystallinity and exists stably in a tetragonal phase under a room-temperature condition.

The invention belongs to the technical field of advanced porous materials, and particularly relates to mesoporous P25 titanium dioxide microspheres and a preparation method thereof. By a solvent evaporation-induced self-assembly method, a commercial amphiphilic triblock copolymer PEO-PPO-PEO is used as a templating agent, organic titanium is used as a titanium source, inorganic acid is used as a titanium dioxide skeleton crystal modifier, a rutile-anatase coexistent skeleton with uniform spherical morphology and divergent mesoporous channels is formed during solvent evaporation, and after the templating agent is removed by roasting, the mesoporous P25 titanium dioxide microspheres are obtained. The mesoporous P25 titanium dioxide microspheres have a large specific surface area and large pore volume; in the skeleton, rutile and anatase are closely packed and the ratio is adjustable, so that the separation efficiency of photogenerated charges and photogenerated holes of a material is significantly improved, and thus the photoelectric conversion efficiency and the efficiency of a reaction for producing hydrogen through photocatalytic water decomposition are greatly improved. The preparation method is simple, a wet preparation process is adopted, raw materials are easy to obtain, and the preparation method is suitable for large-scale production and has a wide application prospect in the fields of environment, energy resources and catalysis and many other fields.