11 results about "Polysilicon halides" patented technology

This invention provides a stabilizer composition and its preparation method. The stabilizer composition comprises, by mass percentage: 50%–99.9% alkane oil solvent, 0.01%–40% fatty acid salt compound, and 0.01%–20% modified fumed silica; wherein the modified fumed silica is fumed silica surface-treated with organohalosilanes. The stabilizer composition of this invention exhibits high dispersibility and low impurities, and can meet the stringent requirements of metallocene catalysts.

The application provides a preparation method of nanometer silicon, which comprises the following steps: mixing a reducing metal and silicon halide, heating under a sealed condition to maintain the reducing metal in a molten state, stirring, and obtaining a reaction product; mixing the reaction product with a higher alcohol with hydrophobicity and then standing to obtain a reaction mixture; mixing the reaction mixture with water and stirring, standing to form a water layer and a hydrophobic colloidal layer, obtaining the hydrophobic colloidal layer, and drying to obtain nanometer silicon. The application is based on a molten metal reduction method, uses active reducing metal and silicon halide as raw materials, heats to maintain the reducing metal in a molten state in the reaction process, and reacts with the silicon halide to prepare nanometer silicon. Then, the prepared nanometer silicon is protected and separated by using the method of higher alcohol grafting. The higher alcohol can reduce the activity of the surface of the nanometer silicon, prevent the nanometer silicon from being oxidized in the process of air or water washing, and reduce the generation of silicon oxide impurities.

The invention provides a stabilizer composition and a preparation method thereof. The stabilizer composition comprises the following components in percentage by mass: 50%-99.9% of an alkane oil solvent, 0.01%-40% of a fatty acid salt compound and 0.01%-20% of modified fumed silica, the modified fumed silica is fumed silica subjected to organic halogenated silane surface treatment. The stabilizer composition provided by the invention has high dispersibility and low impurity content, and can meet the harsh requirements of metallocene catalysts.

The invention provides a production method of a special titanium dioxide primary product. The production method comprises the following steps: S1, preparing titanium tetrachloride mixed gas and adding the titanium tetrachloride mixed gas into a reaction unit; s2, enabling the titanium tetrachloride mixed gas to be in contact with oxygen and liquid potassium chloride in a reaction unit for reaction to generate a titanium dioxide primary product; s3, cooling the titanium dioxide primary product, and adding scar removing sand and silicon halide in sequence in the cooling process; and S4, cooling the primary titanium dioxide product, carrying out gas-solid separation, and collecting the primary special titanium dioxide product. According to the production method of the special titanium dioxide primary product, the basic performance of the titanium dioxide primary product is optimized, meanwhile, the content of aluminum in crystal lattices of the titanium dioxide primary product is increased, and the surface of the titanium dioxide primary product is coated with a layer of silicon dioxide, so that the weather resistance of the titanium dioxide primary product is improved, and the special titanium dioxide primary product with better basic performance and weather resistance is obtained.

The invention relates to a method for preparing quartz sand, which comprises the following steps of: reacting silicon tetrahalide with an alcohol reagent to generate a first reaction mixture; separating the first reaction mixture to obtain halogenated alkoxy silane, first recovered alcohol and first hydrogen halide; adding the halogenated alkoxy silane into an aqueous solution containing a hydrogen halide reagent to generate a second reaction mixture; separating the second reaction mixture to obtain silica sol, second recovered alcohol and second hydrogen halide; cleaning and drying the silica sol to obtain a quartz sand precursor; carrying out sintering decarburization treatment and dehydroxylation treatment on the quartz sand precursor to obtain the quartz sand, wherein the method further comprises a recovery step: combining the first recovered alcohol and the second recovered alcohol to obtain the alcohol reagent, and combining the first hydrogen halide and the second hydrogen halide to obtain the hydrogen halide reagent. In addition, the invention further provides a system for preparing the quartz sand.

A method of manufacturing silicon nano-powders and a manufacturing equipment implementing such method. The method according to the invention utilizes a plurality of aluminum powders to react with a silicon tetrahalide into a plurality of silicon nano-powders and an aluminum trihalide to obtain the silicon nano-powders.

Methods and apparatuses for etching silicon and / or germanium material relative to a contrast material using an etching plasma generated from an etching gas mixture and an additive are provided herein. Methods include etching polysilicon relative to oxide material using an etching plasma generated from an etching gas mixture and a silicon halide gas as an additive.

Disclosed examples relate to selective etching of materials having similar chemical composition. One example presents a method of selectively etching features in a substrate. The substrate includes a first silicon-containing material and a second silicon-containing material having different concentrations of a volatile end functional group. The method includes exposing the substrate to energy sufficient to dissociate at least some of the end functional groups, and exposing the substrate to a halogen-containing etchant, thereby forming volatile silicon halide molecules to remove silicon from the substrate and thereby etch the substrate. The first silicon-containing material is etched at a higher rate than the second silicon-containing material.

The present disclosure relates to a method of producing single-crystal spherical silicon nanoparticles which are monocrystalline and spherical and has an average particle diameter of 1 nm to 20 nm. The method includes a step of mixing and reacting a raw material liquid containing silicon halide with a reduction liquid containing an anion of a condensed aromatic compound produced from lithium, sodium or potassium and the condensed aromatic compound. The anion of the condensed aromatic compound is prepared by mixing the lithium, sodium or potassium and the condensed aromatic compound at a temperature of less than 0° C. The single-crystal spherical silicon nanoparticles produced by the method of the present invention can produce fluorescence from blue to red upon excitation by light in a wide range of wavelengths from deep ultraviolet light having a wavelength of 200 nm to 300 nm to visible light, and can increase the conventionally known fluorescence quantum efficiency of silicon nanoparticles from around 1% to 10% or more.

A method for preparing silica sand includes the following steps: reacting a silicon tetrahalide with an alcohol reagent to generate a first reaction mixture; separating the first reaction mixture to obtain a haloalkoxysilane, a first recovered alcohol, and a first hydrogen halide; adding the haloalkoxysilane to an aqueous solution containing a hydrogen halide reagent to generate a second reaction mixture; separating the second reaction mixture to obtain a silica sol, a second recovered alcohol, and a second hydrogen halide; washing and drying the silica sol to obtain a silica sand precursor; and subjecting the silica sand precursor to sintering decarburization and dehydroxylation treatment to obtain the silica sand; wherein the method further includes a recovery step: combining the first recovered alcohol and the second recovered alcohol to obtain the alcohol reagent, and combining the first hydrogen halide and the second hydrogen halide to obtain the hydrogen halide reagent. Additionally, this application also provides a system for preparing silica sand.

The present invention relates to a method for producing monocrystal, spherical, monocrystal spherical silicon nanoparticles having an average particle diameter of 1 nm to 20 nm, the method comprising a step of mixing and reacting a raw material solution containing silicon halide with a reducing solution containing an anion of a condensed aromatic compound produced from lithium, sodium or potassium and the condensed aromatic compound, the anion of the condensed aromatic compound being prepared by mixing lithium, sodium or potassium with the condensed aromatic compound at below 0°C. The monocrystal spherical silicon nanoparticles produced by the method of the present invention can produce blue to red fluorescence by excitation of light of a wide wavelength from deep ultraviolet light of 200 nm to 300 nm to visible light, and can increase the fluorescence quantum efficiency of the currently known silicon nanoparticles from about 1% to more than 10%.