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 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 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.

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.

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.

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 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 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.