37results about How to "Avoid particle agglomeration" patented technology

A silicon solar cell having a silicon substrate includes p-type and n-type emitters on a surface of the substrate, the emitters being doped nano-particles of silicon. To reduce high interface recombination at the substrate surface, the nano-particle emitters are preferably formed over a thin interfacial tunnel oxide layer on the surface of the substrate.

A method and an apparatus (50) for producing direct reduced iron (37) from dry pellets (25) composed of iron oxide and carbonaceous material. A mixture of pellets (25) and free coke particles (38) with weight relation from 3:1 to 5:1 is fed into the top of an electrothermal fluidized bed (32) that is fluidized by nitrogen. By exposing pellets (25) in the electrothermal fluidized bed (32) to temperatures of between approximately 850-1,100° C. for an average period of between approximately 15-60 minutes, the volatiles are removed and the pellets (25) metallized. Reduced pellets (37) mixed with free coke (38) are discharged from the bottom of fluidized bed (32) and cooled. The reduced iron pellets (37) are physically separated from any free coke (38) and the free coke (38) is recycled back into the fluidized bed (32).

A fuel additive composition includes: a) a reverse-micellar composition having an aqueous disperse phase that includes cerium dioxide nanoparticles in a continuous phase that includes a hydrocarbon liquid, a surfactant, and optionally a co-surfactant and b) a reverse micellar composition having an aqueous disperse phase that includes a cetane improver effective for improving engine power during fuel combustion. A method of making a cerium-containing fuel additive includes the steps of: a) providing a mixture of a nonpolar solvent, a surfactant, and a co-surfactant; and b) combining the mixture with an aqueous suspension of stabilized cerium dioxide nanoparticles.

A silicon solar cell having a silicon substrate includes p-type and n-type emitters on a surface of the substrate, the emitters being doped nano-particles of silicon. To reduce high interface recombination at the substrate surface, the nano-particle emitters are preferably formed over a thin interfacial tunnel oxide layer on the surface of the substrate.

The present invention relates to sol gel hydrous metal oxide particles, such as hydrous zirconium oxide particles, their manufacture, and their use in such applications as sorbent dialysis.

The invention discloses a hollow calcium carbonate microsphere and a preparation method thereof. The preparation method comprises the following steps: 1, preparing solutions of calcium chloride (CaCl2), sodium carbonate (Na2CO3), polyacrylic acid (PAA) and sodium dodecyl sulfate (SDS); 2, adding the prepared PAA in constant volume into the Na2CO3 solution and the CaCl2 solution; 3, adding the SDSsolution into a mixed solution containing the Na2CO3 and PAA only, and adding the solution into a mixed solution of CaCl2 and PAA; 4, filtering, washing and drying the reaction product, thereby obtaining the white powdered hollow calcium carbonate microsphere with excellent monodispersity. The obtained hollow calcium carbonate microsphere has a compound crystal form of calcite and vaterite, is uniform in particle size distribution, does not have an agglomeration phenomenon, and has the mean grain size of 5-8 microns and the specific surface area of 30-60m<2> / g. The preparation method is simplein process, low in cost, easy to control, green, environmentally friendly and capable of realizing industrialized production; the prepared hollow calcium carbonate microsphere has huge application value in the fields of drug sustained release and the like.

A conductive polymer material includes a π-conjugated polymer, dopant polymer which contains a repeating unit having a sulfo group and has a weight-average molecular weight in the range of 1,000 to 500,000, and amphoteric ion compound represented by the following general formula (1),wherein RC1 and RC2 independently represent a linear, branched, or cyclic alkyl group having 1 to 10 carbon atoms, a linear, branched, or cyclic alkoxy group having 1 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms, an acyloxy group having 2 to 10 carbon atoms, an alkoxycarbonyl group having 2 to 10 carbon atoms, a hydroxyl group, a nitro group, a halogen atom; and “m” and “n” are each an integer of 0 to 4. A conductive polymer material with low acidity that suppresses the agglomeration of particles with overtime, with an excellent stability in a solution state can be provided.

The invention relates to a preparation method of a composite cathode material SiOx@Si / C for a lithium ion battery. The preparation method is characterized by comprising the following steps: 1, putting a silicon source into an aqueous solution of ethanol, adding a catalyst and glacial acetic acid, adjusting pH value to 8.5-11.5, and carrying out a hydrolysis reaction for 4h to obtain an intermediate which is a uniform solution, sol or suspending liquid; 2, adding a dispersant into the intermediate and stirring; adding a nano-silicon powder and a carbon source and continuously stirring; carrying out centrifugal separation and vacuum drying on the obtained solution so as to obtain a precursor of the target product SiOx@Si / C; and 3, washing the precursor obtained, centrifuging and carrying out vacuum drying, putting the precursor into an argon tubular atmosphere furnace to carry out subsection pyrolysis, and carrying out furnace cooling to obtain the target product SiOx@Si / C. According to the composite cathode material prepared in the invention, volume expansion arising in the charge-discharge process can be effectively inhibited; initial charge / discharge efficiency reaches 73.8%; the composite cathode material has very excellent electrochemical performance and stable cycle performance; and the preparation technology is simple and easy to implement.

The present invention is an additive for producing a positive active material for lead-acid storage batteries on the basis of finely divided tetrabasic lead sulfate. The additive contains a tetrabasic lead sulfate of an average particle size less than about 3 μm as well as finely divided hydrophobic silicic acid for preventing agglomeration of the particles of the tetrabasic lead sulfate. During maturation, this additive ensures the formation of the structure of a tetrabasic lead sulfate crystal with a very narrow bandwidth of crystal sizes and a very homogeneous distribution. In the subsequent electrochemical formation to lead oxide, this leads to particularly efficient lead-acid storage batteries. Furthermore, the invention relates to a method of making the additive according to the invention as well as its advantageous use in the positive material for the maturation and drying of plates in the production of lead-acid storage batteries.

A method is provided for producing particles, such as nanoparticles. The method includes introducing an ionic liquid into a deposition chamber, and directing one or more material toward or depositing one or more materials onto the ionic liquid by physical vapor deposition to form nanoparticles in the ionic liquid.

The invention discloses a sludge living organism cell wall breaking device and a method used for sludge living organism cell wall breaking. The device comprises a jet-flow feeding system, an ore pulp high-pressure circulating cavitation system, a high-strength magnetic medium grinding system and a cooling system, wherein a sludge raw material is input into the high-strength magnetic medium grinding system through the jet-flow feeding system; a transmission system is started for enabling a stirrer to stir, so that sludge is grinded for promoting sludge living organism cell wall breaking; the ore pulp high-pressure circulating cavitation system is started for circulating sludge slurry inside and outside the magnetic stirring barrel; and the cooling system is started for keeping a temperature in the magnetic stirring barrel constant until sludge living organism cell wall breaking is completed. The device integrates a Maurice model, a high-pressure homogenizing principle, a hydrodynamic cavitation principle, a gas bubble stretching and dispersing principle, a static cyclone principle, and the like, can be used for quickly and efficiently realizing sludge living organism cell wall-breaking with low cost, is simple in operation process, is convenient to operate, and meets industrial production.

The invention relates to a method for efficiently preparing positive and negative electrode paste. The preparation of positive electrode paste comprises the following steps: mixing a positive electrode active substance and a conductive agent in a three-dimensional mixing machine, adding a binder (PVDF: polyvinylidene fluoride) into a N-methyl pyrrolidone (NMP) solution for stirring and dissolving by utilizing an automatic loading and stirring machine, performing vacuum pumping, finally slowly adding positive electrode powder which is uniformly mixed into a stirring tank of the automatic loading and stirring machine along a feed port of the automatic loading and stirring machine, further performing vacuum pumping after the adding of the material is completed, and controlling the temperature in the whole process of gluing and paste combination at 20-45 DEG C. The preparation of negative electrode paste comprises the following steps: placing a negative electrode active substance and the conductive agent into the three-dimensional mixing machine for mixing, adding sodium carboxymethyl cellulose (CMC) into deionized water (H2O) for stirring and dissolving by utilizing the automatic loading and stirring machine, and controlling the temperature in the whole process of gluing and paste combination at 20-45 DEG C.

The invention relates to a method for preparing ITO (indium tin oxide) granulation powder by a mixing method. The method comprises the following steps: (1) weighing indium oxide and tin oxide powder for later use; (2) dissolving a dispersing agent and a binder in deionized water; (3) dispersing indium oxide and tin oxide powder into the solution obtained in the step (2); (4) putting the slurry into an ultrasonic instrument for pre-dispersion to obtain slurry to be ground; (5) putting the slurry to be ground into a ball mill for grinding; (6) adding a defoaming agent into the slurry, and stirring for defoaming; and (7) carrying out spray drying on the mixed slurry to obtain the ITO granulation powder. According to the method, by adding all materials and additives (the dispersing agent and the binder) at the same time, pre-dispersing the slurry under the combined action of ultrasonic treatment and stirring and putting the slurry into a grinding machine for sanding, the advantages that the grain size of the target material is small and uniform can be obtained through a mechanical mixing method, and the problem that good component uniformity and high activity are difficult to obtain atthe same time when ITO particles are prepared through a mixing method is solved.

The invention discloses a method for preparing an ordered magnetic nanoparticle composite film with super-high density, which comprises the steps of: at first, preparing FePt / CoPt superparamagnetic nanoparticle; self-assembling a FePt / CoPt superparamagnetic nanoparticle-containing nonmagnetic substrate and using an atomic layer deposition technique to grow an inorganic nonmagnetic matrix film protective layer of 10-30 nanometers on the surface of the substrate containing a single layer of FePt / CoPt nanoparticle lattice; putting the deposited substrate in a tubular diffusion furnace for annealing for 30 to 90 minutes at high temperature from 600 to 750 DEG C in a reducing atmosphere of 90-97% of Ar and 10-3% of H2 to result in the composite film of FePt / CoPt ferromagnetic nanoparticles and oxides. The method can obtain the ordered FePt / CoPt nanoparticle composite film with L10 phase, good magnetic property and the magnetic coercive field up to Hc=5.9kOe.

The present invention relates to a method for preparing superabsorbent polymer with improved anti-caking, and according to the present invention, a method for preparing superabsorbent polymer that has properties equivalent to or more excellent than the existing superabsorbent polymer but has improved anti-caking, and thus, has excellent processability, and superabsorbent polymer prepared thereby, are provided.

Particle coating processes and systems employ UV curable materials to form tack-free surfaces rapidly. By applying UV curable compositions on well suspended particles a UV particle coating technology enables a scalable process of coating fine particles at desirable coating thicknesses with a wide spectrum of obtainable properties. Processes in accordance with the present invention decouple the particle suspension and film formation steps, enabling ample time to first deliver evenly the coating materials to the particle surfaces, followed by rapid polymerization / curing reaction induced by the UV light to rapidly create tack-free surfaces, thus preventing particles agglomeration while achieving uniform and thin-layer coating.

The invention belongs to the technical field of electrochemical catalysis, and particularly relates to a ruthenium-based catalyst as well as a preparation method and application thereof. The ruthenium-based catalyst comprises a carbon carrier and a ruthenium-based disulfide compound loaded on the carbon carrier, and belongs to a loaded catalyst. By loading the ruthenium-based disulfide compound onthe carbon carrier, the dispersity of ruthenium-based disulfide compound particles can be improved, and the carbon carrier can also provide a large number of pore structures, so that particle aggregation during high-temperature annealing treatment is avoided, and more active sites are provided. The cost of the ruthenium-based catalyst provided by the invention is remarkably lower than that of a Pt / C catalyst, and the ruthenium-based catalyst not only has higher catalytic activity, but also shows excellent electrochemical hydrogen evolution performance in an acidic solution and alkaline solution system, is expected to replace a commercial Pt / C catalyst, and has a good application prospect.

A conductive polymer material includes a π-conjugated polymer, dopant polymer which contains a repeating unit having a sulfo group and has a weight-average molecular weight in the range of 1,000 to 500,000, and amphoteric ion compound represented by the following general formula (1),wherein RC1 and RC2 independently represent a linear, branched, or cyclic alkyl group having 1 to 10 carbon atoms, a linear, branched, or cyclic alkoxy group having 1 to 10 carbon atoms, an acyl group having 2 to 10 carbon atoms, an acyloxy group having 2 to 10 carbon atoms, an alkoxycarbonyl group having 2 to 10 carbon atoms, a hydroxyl group, a nitro group, a halogen atom; and “m” and “n” are each an integer of 0 to 4. A conductive polymer material with low acidity that suppresses the agglomeration of particles with overtime, with an excellent stability in a solution state can be provided.

A method is provided for producing particles, such as nanoparticles. The method includes introducing an ionic liquid into a deposition chamber, and directing one or more material toward or depositing one or more materials onto the ionic liquid by physical vapor deposition to form nanoparticles in the ionic liquid.

The invention relates to a PtFe intermetallic compound coated with a nitrogen-doped carbon layer and its preparation and application, belonging to the technical field of fuel cells. The preparation method is to uniformly disperse a platinum precursor, an iron precursor, an amino-containing organic substance, and a carrier in deionized water to obtain a mixed solution, and then heat to evaporate the water in the mixed solution to obtain a viscous intermediate substance; The viscous intermediate product is dried and ground to obtain a solid powder; the solid powder is calcined in a protective gas atmosphere, and the calcining is specifically: at a heating rate of 1°C / min-10°C / min Raise the temperature to 700°C-1000°C, then keep it warm for 0.5h-5h, and after cooling, the nitrogen-doped carbon-coated PtFe intermetallic compound is obtained. The nitrogen-doped carbon-coated PtFe intermetallic compound catalyst prepared by the invention has more excellent oxygen reduction activity and stability than the non-carbon-coated PtFe disordered alloy and commercial carbon-supported platinum.

A microfluidic device and method is provided for concentrating particles in a fluid sample. The microfluidic device has a chamber, wherein the chamber has a filtering unit defining a first compartment and a second compartment, the first compartment being in fluid communication with the second compartment and being for receiving a fluid sample containing particles, the filtering unit being configured to selectively retain particles of the fluid sample based on a size of the particles, at a sub-region of the first compartment as the fluid sample flows from the first compartment to the second compartment; and an acoustic transducer configured to generate acoustic waves in the sub-region to disperse the particles.

The invention discloses a nano-particle ultrasonic atomization and classification device and method and belongs to the technical field of nano powder classification. The ultrasonic atomization and classification device comprises an ultrafine powder solution tank, a material inlet pipe, a ring-shaped feeding pipe, a variable cross section draining pipe, a material return pipe, an ultrasonic atomization reaction tank, an ultrasonic atomization device, an air blowing device, a water mist collecting pipe, a gas-liquid separation device and a water mist collecting tank. By means of the nano-particle ultrasonic atomization and classification device, the classification precision meets the classification requirement of nanoscale particles, the problems that a current nano powder classification device has the problems that the material liquid utilization rate is low, the material liquid input amount is not matched with the atomization amount of a transducer, the material liquid input position is not matched with the position of the transducer, and water mist collection is insufficient are solved, and the classification precision, the material liquid utilization rate and the classification efficiency can be effectively improved.

The invention relates to the technical field of die processing, in particular to anti-corrosion liquid for anti-corrosion treatment on the surface of a metal die. The anti-corrosion liquid is prepared from 10 parts of ethyl acetate, 15 parts of diethanol amine, 10 parts of dioxane, 5 parts of dilute acetic acid, 1 part of anthocyan, 10 parts of methyl alcohol and 40 parts of water. According to the anti-corrosion liquid used in a surface anti-corrosion treatment method, the formula is designed reasonably, especially a small amount of anthocyan is added, so that the anti-corrosion treatment efficiency of the anti-corrosion liquid is obviously improved, and the anti-corrosion performance of the metal die is obviously improved.

The invention discloses a method for preparing an ordered magnetic nanoparticle composite film with super-high density, which comprises the steps of: at first, preparing FePt / CoPt superparamagnetic nanoparticle; self-assembling a FePt / CoPt superparamagnetic nanoparticle-containing nonmagnetic substrate and using an atomic layer deposition technique to grow an inorganic nonmagnetic matrix film protective layer of 10-30 nanometers on the surface of the substrate containing a single layer of FePt / CoPt nanoparticle lattice; putting the deposited substrate in a tubular diffusion furnace for annealing for 30 to 90 minutes at high temperature from 600 to 750 DEG C in a reducing atmosphere of 90-97% of Ar and 10-3% of H2 to result in the composite film of FePt / CoPt ferromagnetic nanoparticles andoxides. The method can obtain the ordered FePt / CoPt nanoparticle composite film with L10 phase, good magnetic property and the magnetic coercive field up to Hc=5.9kOe.

The present invention relates to a Cu 2 The invention discloses a method for preparing an O / ZnO composite photocatalyst, belonging to the technical field of photocatalysts. In the present invention, copper salt and zinc salt are dissolved in water to obtain a mixed salt solution; under stirring conditions, the precipitant solution is dropped dropwise into the mixed salt solution to react until the pH value is 7 to 7.5 to obtain a reaction system, and the reaction system is filtered to obtain copper Zinc hydroxide solid; add the reducing agent to the mineralizer solution to obtain a reduction-mineralization solution, add copper-zinc hydroxide solids to the reduction-mineralization solution, and react hydrothermally at a temperature of 120~160°C More than 12h, naturally cooled to room temperature, filtered to obtain Cu 2 O / ZnO solid; Cu was washed repeatedly with deionized water and absolute ethanol 2 O / ZnO solid to the pH value of the washing solution is 7~7.5, filtered to obtain Cu 2 O / ZnO powder, dry to get Cu 2 O / ZnO photocatalyst. The present invention Cu 2 The composite powder of the O / ZnO composite photocatalyst has small particles, high recycling rate, good dispersion, high photocatalytic efficiency, simple synthesis method, easy operation, short reaction time and low cost.

The invention provides a barium sulfate suspension system with uniform dispersion and low viscosity, and a preparation method and application thereof, and belongs to the field of solid particle suspension dispersion. The barium sulfate suspension system provided by the invention comprises 0.01-0.8 part of fatty alcohol polyoxyethylene ether carboxylic acid, 5-60 parts of barium sulfate particles and 39.2-94.99 parts of an oil phase. The fatty alcohol polyoxyethylene ether carboxylic acid can enable barium sulfate particles to maintain good dispersion stability in an oil phase, the use amount of the fatty alcohol polyoxyethylene ether carboxylic acid can be controlled to enable the system viscosity to be maintained within a low range when the concentration of the barium sulfate particles ishigh, and the problems of particle aggregation, system viscosity increase and the like when the barium sulfate particles are dispersed in the oil phase are avoided. Experimental results show that according to the barium sulfate suspension system provided by the invention, when the mass content of barium sulfate particles is 5-60% and the shearing rate is 100 s<-1>, the system viscosity is 20 mPa*s or below, and the barium sulfate suspension system has good rheological property and is uniform in barium sulfate particle dispersion.

The invention discloses a C / Ti4O7 composite nanofiber based lithium-sulfur battery positive electrode material. The lithium-sulfur battery positive electrode material is compounded by elemental sulfur and C / Ti4O7 composite nanofiber, wherein the C / Ti4O7 composite nanofiber adopts a core-shell structure; and the Ti4O7 is taken as the core while porous carbon is taken as the shell. The preparation method comprises the steps of preparing the C / Ti4O7 composite nanofiber by an electrostatic spinning process; mixing the C / Ti4O7 composite nanofiber with the elemental sulfur; and putting the mixture into a sealed container and performing thermal treatment at a temperature of 150-155 DEG C for 12-24h to obtain the positive electrode material. The positive electrode material has a porous channel structure formed by the porous carbon, so that rapid polysulfide absorption can be realized, and the cycling life of the lithium-sulfur battery can be prolonged; and in addition, due to the high conductivity of Ti4O7, the utilization rate of sulfur is improved, so that the cycling performance of the lithium-sulfur battery is relatively high.