272 results about "Polystyrene spheres" patented technology

An apparatus and method for recording spatially dependent intensity patterns of polarized light that is diffusely backscattered from highly scattering media are described. These intensity patterns can be used to differentiate different turbid media, such as polystyrene-sphere and biological-cell suspensions. Polarized light from a He-Ne laser ( lambda =543 nm) is focused onto the surface of the scattering medium, and a surface area of approximately 4x4 cm centered on the light input point is imaged through polarization analysis optics onto a CCD camera. A variety of intensity patterns may be observed by varying the polarization state of the incident laser light and changing the analyzer configuration to detect different polarization components of the backscattered light. Experimental results for polystyrene-sphere and Intralipid suspensions demonstrate that the radial and azimuthal variations of the observed pattern depend on the concentration, size, and anisotropy factor, g, of the particles constituting the scattering medium. Measurements performed on biological cell suspensions show that intensity patterns can be used to differentiate between suspensions of cancerous and non-cancerous cells. Introduction of the Mueller-matrix for diffusely backscattered light, permits the selection of a subset of measurements which comprehensively describes the optical properties of backscattering media.

The invention relates to an inorganic porous material synthesis technology field, and concretely relates to a method for preparing hollow mesoporous lamella spherical silica material. In a mixed solvent of alcohol and water, under the catalytic action of ammonia, using a cationic surface active agent of cetyl trimethyl ammonium bromide as a mesoporous template, the inorganic silicon material self-assembles to be mesoporous uniform spheres on the polyphenylacetylene sphere surface, the surface active agent and the polyphenylacetylene sphere are deprived in high temperature environment, the hollow silica spheres with uniform size from micron to millimeter and mesoporous lamella are obtained. The specific surface area of the obtained hollow silica sphere is 800-2000m<2>/g, the bore diameter is 1.8-3.5nm, and the bore volume is 0.5-0.8 ml/g.

A sensor for detecting the presence of a target analyte, ligand or molecule in a test fluid, comprises a light transmissive substrate, an array of surface plasmon resonant (SPR) elements mounted thereon, a light source arranged to direct light into the SPR elements, and a detector arranged to detect light transmitted through the SPR elements. The SPR elements may include a dielectric polystyrene sphere having a spherical diameter of about 770 nm with a gold coating layer about 150 nm thick. The interface between the SPR elements and the substrate forms a pinhole with a diameter less than the wavelength of the light directed into the elements to produce a near-field coupling mode within the micro-sized SPR elements. In specific embodiments, the pinhole diameter ranges between 150-200 nm. The SPR elements are contained within a molded PDMS chip that may incorporate micro-fluidic components, such as a pump and valves, to control flow of the test fluid across the SPR elements. A multi-channel sensor may be provided for detecting the presence of several targets with a single micro-chip sensor. In the multi-channel sensor collections of SPR elements are commonly functionalized to one of the several targets. The detectors sense changes in the resonant response of the SPR elements indicative of binding with the targets.

The invention discloses a preparation method for alumina hollow spheres. The preparation method comprises the steps of preparing a chitosan-acetic acid-water solution; weighing raw materials according to a mass ratio of polystyrene spheres to the chitosan-acetic acid-water solution 5:1 to 10:1 and a mass ratio of the polystyrene spheres to alpha-alumina powder of 1:5 to 1:15; mixing and stirring the polystyrene spheres and the chitosan-acetic acid-water solution to make the surfaces of the polystyrene spheres uniformly coated by a layer of the chitosan-acetic acid-water solution; putting the polystyrene spheres coated by the chitosan-acetic acid-water solution and the alpha-alumina powder in a ball-milling device, rotating at a rotation speed of 5-30 r/s to coat for 2-24 h so as to prepare core-shell spheres; and sintering the core-shell spheres to obtain the alumina hollow spheres with the diameter of 0.2-2 mm and wall thickness of 20-100 [mu]m. The preparation method is low in cost of the raw materials, simple in process and safe and simple in operations, and can realize industrial production easily.

The invention discloses a method for preparing controllable ordered porous tin dioxide nano structures, and belongs to the technical fields of gas sensitive sensing materials and solar cell preparation. The method comprises the following steps of: mixing SnCl4.4H2O and absolute ethanol in a certain ratio, keeping the mixture for 8 to 12 hours at the constant temperature of between 70 and 90 DEG C to obtain tin dioxide sol solution, and dripping the tin dioxide sol solution onto a substrate, the surface of which polystyrene spheres are deposited on; and drying, and performing high-temperature annealing to obtain the controllable ordered porous tin dioxide nano structures. By the method, the contact area of the materials and the external environment is greatly improved, and controllable adjustment of aperture size, pore wall thickness and three-dimensional depth of the product can be realized; and the product has excellent gas sensitive performance and photoelectric performance.

The invention discloses a method for preparing the positive electrode material LiFePO4/C of a lithium ion battery by adopting carbon sources of the polystyrene sphere series. A carbon thermal reduction and solid phase sintering method is adopted in the preparation process. The method comprises the following concrete steps: firstly, uniformly mixing a lithium source, an iron source and a phosphorus source, and then, mixing the mixture with a carbon source; then, adding a solvent for ball milling, and drying to obtain a precursor; and pretreating and calcining the precursor in the protective atmosphere, and then, cooling the precursor in a furnace to synthesize the LiFePO4/C of which the particle size distribution is uniform and the particle diameter is 200-500nm. The invention has the advantages of wide sources of raw materials, simple preparation method, convenient control and operation, good carbon coating effect, excellent electrochemical performance and the like.

The invention discloses an anti-counterfeit label based on a patterned metal nanocomposite and a production method of the anti-counterfeit label. The anti-counterfeit label comprises a base material adopting a hard or flexible material and a patterned metal and polystyrene sphere composite nanostructure which is formed on the base material, wherein the patterned metal and polystyrene sphere composite nanostructure comprises a polystyrene microphere array coating the surface of the base material and a metal layer plated on the polystyrene microsphere array. The anti-counterfeit label is characterized in that colorful structured lights can be generated through a surface plasma resonance phenomenon, so as to form clear and recognizable pattern labels; a specific organic matter combination with Raman scattering activity is further added to be used for hiding or reading encrypted information at higher anti-counterfeit grades. As an anti-counterfeit label material, the anti-counterfeit label achieves multiple anti-counterfeit characteristics, has the characteristics of being high in anti-counterfeit grade, convenient to use, and the like, and can be widely applied to the industries of pharmacy, food, aircraft parts, automobile parts, brand-name clothes, luxuries, artworks, and the like.

The invention provides a polystyrene/calcium alginate composite gel microsphere in a nuclear shell structure and a preparation method thereof, relating to biopolymer materials. The polystyrene/calcium alginate composite gel microsphere in the nuclear shell structure takes a polystyrene microsphere as a core and calcium alginate gel as a shell, wherein the grain size of the core is 1-100 microns, and the thickness of the shell layer is 50-800 nm. The preparation method comprises the following steps of: mixing polystyrene microsphere with aqueous solution containing a surface active agent I, and carrying out ultrasonic emulsification to obtain mixed solution A; adding sodium alga acid solution in the mixed solution A, and stirring to obtain mixed solution B; adding organic solution containing a surface active agent II into the mixed solution B, and stirring to obtain mixed solution C; adding calcium chloride solution which has the same volume with the sodium alga acid solution into the mixed solution C under stirring to react, and carrying out vacuum filtration, washing the solution until no calcium ion residue exists on the surface and drying to obtain a product D; and dispersing the product D into water, centrifuging the mixture, pouring out supernate and taking out precipitate to obtain the product.

The invention discloses a method for preparing a three-dimensional ordered porous lead dioxide membrane electrode by a template electro-deposition method. The method comprises the steps of preparing an antimony-doped tin dioxide intermediate layer on a porous titanium matrix via a sol-gel method, assembling a polystyrene sphere mono-dispersion serving a template agent to the intermediate layer via natural settlement, then preparing a lead dioxide active layer in the gap of the template agent via an electro-deposition method, and finally dissolving the template agent to obtain the lead dioxide membrane electrode with a porous structure. The lead dioxide membrane electrode has three-dimensional ordered porous structure, large specific surface area, many electrochemical active sites and large filtration flux, overcomes the defects that the traditional lead dioxide electrode has a compact structure and cannot be applied to a filtering electrochemical system, and has great application value in the electrochemical catalysis field.

The invention discloses a cobalt-nickel-double-metal-hydroxide-nanosheet/carbon-nitride-coated nitrogen-doped hollow graphene sphere composite material and a preparation method thereof, and application as a supercapacitor electrode material. The composite material comprises a cobalt-nickel-double-metal-hydroxide-nanosheet/carbon-nitride-coated nitrogen-doped hollow graphene sphere has a 3D spherical appearance; and the specific surface area is 100 to 1000m<2>/g and the average pore diameter of 1 to 200mm. In addition, the preparation method includes the following steps: preparing a small polystyrene sphere; preparing a polyaniline-coated graphene sphere; preparing a carbon-nitride-coated nitrogen-doped hollow graphene sphere; and preparing a cobalt-nickel-double-metal-hydroxide-nanosheet/carbon-nitride-coated nitrogen-doped hollow graphene sphere composite material. Therefore, a problem of series agglomeration of the cobalt-nickel double-metal hydroxide unit structure during the traditional preparation technology process is solved effectively; and a novel method is provided for preparing an electrode material with advantages of large specific surface area, high flexibility, high electric capacity, and high stability.

The invention provides a hollow spheroidal mullite whisker material and a preparation method thereof. The preparation method comprises steps as follows: silica sol, water and ethanol are added to a container and stirred uniformly, the pH value is regulated to 2, and silica sol is formed; alumina powder, aluminum fluoride trihydrate and ethanol are mixed and subjected to ball milling, and mixed slurry is obtained; the silica sol and the mixed slurry are mixed uniformly in a volume ratio of 1:(0.5-1.4), the pH value is regulated to 7-9, gelatinization is performed, and precursor powder is obtained; a polyvinyl alcohol solution is uniformly sprayed to the surfaces of polystyrene spheres, starch spheres, phenol-formaldehyde resin spheres or urea spheres, then the spheres are put in the precursor powder to adhere to the precursor powder, the operation is repeated multiple times, then ball milling, drying and calcining are performed in sequence, and the hollow spheroidal mullite whisker material is obtained. According to the hollow spheroidal mullite whisker material, the volume density is 0.34-0.85 g/cm<3>, the room-temperature thermal conductivity is 0.184-0.485 W/(m<-1>.K<-1>), and the open porosity is 62.33%-81.86%.

A preparation method of a three-dimensional flocculent graphene substrate material and an application belong to the field of preparation of a functional nanometer material. The preparation method comprises the following steps: 1, graphite oxide is placed in a crucible to prepare expanded graphite; 2, 10-20mg of expanded graphite is dispersed in 10-30mL of water, 200-800 microliters of an aqueous dispersion liquid of polystyrene spheres is added and an ultrasonic treatment is carried out for 1h-4h; 3, suction filtration of a dispersion liquid of an expanded graphite-polystyrene compound system is carried out directly on foamed nickel, drying at 40-60 DEG C for 12-18h, the foamed nickel loaded with expanded graphite-polystyrene is placed in a mixed solution of hydrazine hydrate and ammonia with the volume ratio of hydrazine hydrate to ammonia being 1:5-1:10 so as to react at 90-95 DEG C for 1-3h, deionized water is used for immersion and washing, and drying is carried out; and 4, the temperature rises to 450-500 DEG C at the heating rate of 1-2 DEG C/min under a vacuum condition, and thermal insulation is carried out for 1-2h, and a finished product is taken out finally. The prepared material has a three-dimensional flocculent structure similar to a pore structure, has excellent conductivity and can be used to greatly reduce internal resistance of a capacitor and improve capacitive performance of an electrode active material. The preparation method is suitable for large-scale production of graphene.

The invention provides a preparation method for hollow hemispherical titanium dioxide. The preparation method comprises the following steps: with a nanometer polystyrene sphere synthesized by using a soap-free emulsion polymerization method as a template, coating the surface of the polystyrene microsphere with a titanium dioxide shell layer by using a mixed solvent method; carrying out centrifugal cleaning and drying so as to obtain a titanium dioxide-coated polystyrene core-shell microsphere; subjecting the titanium dioxide-coated polystyrene core-shell microsphere to high-temperature calcination so as to allow polystyrene to be fused and decomposed, wherein the shell part of titanium dioxide collapses to form a semispherical structure and the hollow hemispherical titanium dioxide with excellent photocatalysis performance is obtained. The method provided by the invention can realize controllable adjustment of the size and thickness of titanium dioxide hemispheres, and is simple to operate and easy to realize large-scale production; and the prepared hollow hemispherical titanium dioxide has the characteristics of a large specific surface area, low density and excellent photocatalysis performance.

The invention relates to a high-strength and high-aluminum light heat-insulation and fire-resistant brick, which is used in a heat-insulation layer in thermal equipment, and a production method thereof. The fire-resistant brick includes following basic raw materials: 30-35% of a high-aluminum alumina clinker, 10-20% of an expansion agent and 45-55% of a bonding agent and additionally includes 0.1-0.15% of engineering fibers and 0.15-0.2% of a water reducer on the basis of the total amount of the basic raw materials above. In addition, each ton of the basic raw materials is added with 0.7-2.0 m<3> of expandable polystyrene spheres. The bonding agent is kaolin or high-aluminum alumina cement and is 200-320 meshes in granularity. The production method includes the steps of stirring the raw materials to form a sludge material, preparing the sludge material into green bricks, drying the green bricks, and sintering the green bricks at 1350-1400 DEG C with heat insulation. The fire-resistant brick is high in pressure resistance strength, is low in heat conductivity and is low in change rate of a high temperature reburning curve. The normal-temperature pressure resistance strength of the fire-resistant brick is higher than that of a common fire-resistant brick by more than two times. The fire-resistant brick can be used in a heat insulation layer and a fireproof layer in all thermal equipment, achieves both energy-saving and fireproofing effects and is beneficial to popularization.

The invention belongs to a process for manufacturing a micro-nano bionic structure, and particularly relates to a process for manufacturing a bionic gecko foot structure material. The process comprises steps of (1) self-assembling polystyrene spheres with a diameter from 100 nanometers to 1 micrometer; (2) performing plasma etching on the polystyrene spheres; (3) plating a protective layer; (4) removing the polystyrene spheres; (5) plating a catalyst layer; (6) performing wet etching; (7) performing spin coating of photoresist and performing photoetching development; and (8) casting a mould and demoulding, pouring polydimethylsiloxane (PDMS) on a compound die, baking, and peeling off the PDMS from the compound die to obtain the nano-micro layered bionic gecko foot structure material. The process can be used for manufacturing a bionic gecko foot layered structure which has quite high absorbability, can be easily separated from an absorbed surface, and has super-hydrophobicity and self-cleaning ability.

The present invention relates to method of preparing silicon oxide material having high degree of order, large pore-mosopore dual pore and high specific surface area. Surfactant is used as structure guide agent combine with inorganic silicon material to assemble into ordered structure, and under the guide of new large pore template agent polystyrene ball, through sol-gel process to form into shape. Surfactant and polystyrene ball are rmoved under high temperature, thereby multigrade silicon oxide material with high degree of order and large pore mesopole is obtd. The invented multi grade porematerial can be extensively used in adsorption, separation, sensor, optical material etc.

The invention relates to a mullite light heat-insulation fire-resistant brick and production method thereof. The fire-resistant brick includes following raw materials: 25-35% of aluminium hydroxide, 10-30% of flint clay clinker, 10-30% of kyanite, 35-50% of a bonding agent. With the raw materials, 1.0-2.0 m<3> of expandable polystyrene and 0.3-0.5 m<3> of sawdust are added. The bonding agent is kaolin or aluminum oxide cement. The fire-resistant brick is high in pressure resistance strength, is low in heat conductive coefficient, is low in change rate of a high-temperature re-burning curve and is good in thermal shock resistance, is excellent in performance and can reach the requirement of the standard of related products in American ASTM. By means of aluminium hydroxide for replacing aluminum oxide, the production method is low in energy consumption and cost, can generate more mullite crystal phases, can effectively reduce the content of a corundum phase in the product, and can increase the thermal shock resistance. The fire-resistant brick can be used in a heat insulation layer and a fireproof layer in all thermal equipment, achieves both energy-saving and fireproofing effects and is beneficial to popularization.

The invention provides a preparation method of a mesoporous carbon sphere material. The preparation method comprises the following steps: dissolving polystyrene spheres in water or an organic solvent; under an ultrasonic condition, adding a carbon source into suspension liquid obtained in the step, and continuously carrying out ultrasonic treatment for at least 0.5 hour-6 hours; separating solids; and preparing the mesoporous carbon sphere material by a high-temperature roasting method under an inert atmosphere, wherein a weight ratio of the polystyrene spheres to the carbon source is 1:(50-100), and a volume ratio of the polystyrene spheres to water or the organic solvent is 1:(500-1000). The preparation method is simple and easy to carry out and low in cost, realizes dispersion of a template and polymerization of a carbon source under an ultrasonic condition, is free of heating and stirring, free of an oxidant or a catalyst, time-saving and labor-saving; under protection of inert gases, a carbon precursor is carbonized to obtain hollow mesoporous carbon spheres while the template is removed by high temperature; the template is removed without extra steps, and therefore, the preparation method is simple and easy to carry out, and avoids pollution at the same time.

The present invention provides a production method used for focusing lithography forming sub-wavelength micro-nanostructure of polystyrene sphere, and is characterized in that: surface of substrate material firstly selected is sequentially in a spinning manner coated with a layer of anti-corrosion agent, evaporated with a layer of metal structure, then in a spinning manner coated with a layer of interval layer, and finally assembled with a layer of the polystyrene sphere. The structure is exposed in exposure system, then the polystyrene sphere, the interval layer and the metal layer structure are removed, the substrate is positioned into developing agent for development and obtainment of target structure, and finally the structure is transmitted to the substrate by etch of the target structure. The present invention adopts the polystyrene sphere as a focusing lens, further reduces the cycle and dimension of the lens, has stimulation of surface plasma inside the metal in the focusing and exposure as the metal structure is evaporated on the surface of the exposed anti-corrosion agent, improves resolution of a focusing focal spot, reduces the characteristic size of the forming targeted structure, and provides an effective method for the production of the sub-wavelength micro-nanostructure.

A method for producing size-controllable magnetic hollow spheres belongs to the technical field of magnetic materials. The method is characterized in that a monodisperse polystyrene sphere prepared by adopting the emulsion-polymerization method and dispersion-polymerization method is used as a template; inorganic metallic salts conduct coprecipitation under the action of a precipitating agent, namely sodium hydroxide, in a water solution; a ferrite precursor for coating the polystyrene sphere is formed by the deposition on the surface of the template sphere; and during the calcining process at the high-temperature, the ferrite precursor conducts the crystal transformation when the macromolecular spherical template decomposes, so that the polystyrene sphere coated with the ferrite precursor is converted into a corresponding magnetic hollow sphere. The method has the advantages of simple and convenient operation, favorable popularization and environmental friendliness. The magnetic hollow sphere prepared by adopting the method possesses a regulated and monodispersed hollow spherical structure and different magnetic properties, meets the requirement of different practical applications, and illustrates a good prospect of application in the fields, such as the separation science, the drug targeting preparation, the material science, the coating industry, and the like.

The invention relates to a similar no-electric solvent resistance composite functional ball, in particular to a urea-formaldehyde resin coating polystyrene ball/titanium dioxide nanometer particle. The similar no-electric solvent resistance composite functional ball is urea-formaldehyde resin coating polystyrene ball/titanium dioxide nanometer particle. The preparation method comprises: using polyvinylpyrrolidone or silane coupler to modify polystyrene ball/titanium dioxide nanometer particle; using in-situ polymerization to condensate urea-formaldehyde prepolymer on the surface of the nanometer particle to form dense and transparent similar no-electric urea-formaldehyde resin coat, to obtain solvent resistance particles. The similar no-electric solvent resistance composite functional ball is matched with disperse mediums and can resist the corrosion of non-polar solvent, to stabilize the particles in the solvent and overcome the defects caused by using dyes, thereby providing a base for stabilizing two dyes of different colors in electrophoretic liquid to realize bistability display.

The invention discloses a preparation method and application of a three-dimensional ordered macroporous molybdenum disulfide/carbon composite flexible electrode. Through an amine compound solution for processing carbon cloth, the carbon cloth has positive charges and then is impregnated in an aqueous solution composed of polystyrene spheres with negative charges, a molybdenum source and a carbon source precursor; and during the subsequent calcining process, through matching generating rate of molybdenum disulfide and carbonization rate of the precursor, assembling of a three-dimensional ordered macroporous molybdenum disulfide/carbon embedded structure composite material on the carbon cloth is realized. The prepared electrodes combines high-performance electrode material, flexibility and integrated design without the need of using inactive substances such as a binder, a conductive agent, etc., remarkably enhances utilization rate of active substances, shows excellent electrochemical lithium storage capacity, and is expected to be applied in the field of flexible electronics, etc.