10 results about "Nanoporous silicon" patented technology

The invention discloses petroleum coke, a silicon carbon material, a silicon composite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: carrying out first solid removal treatment on a first heavy oil raw material to obtain first purified heavy oil; carrying out second solid removal treatment on the second heavy oil raw material to obtain second purified heavy oil; mixing the second purified heavy oil with nano-porous silicon to obtain third purified heavy oil and heavy oil containing nano-porous silicon; carrying out spray granulation on the heavy oil containing the nano porous silicon to obtain a silicon-carbon precursor and fourth purified heavy oil; mixing the third purified heavy oil, the fourth purified heavy oil and the first purified heavy oil to obtain heavy mixed oil; carrying out distillation, pyrolysis and modification treatment on the heavy mixed oil to obtain petroleum coke; carbonizing the silicon-carbon precursor to obtain a silicon-carbon material; the silicon composite negative electrode material is prepared from petroleum coke and a silicon carbon material. The petroleum coke and the silicon carbon material with relatively high quality can be prepared, and the electrochemical performance of the negative electrode material can be improved.

The utility model relates to a fresh-keeping packaging device for high-activity fresh yeast, which belongs to the technical field of yeast fresh-keeping, and comprises a box body and a box cover, the inner side of the box body is fixedly connected with a nano-porous silica gel film, the outer side of the box body is fixedly connected with a hydrophobic breathable PE (polyethylene) film, the bottom of the box cover is fixedly connected with a sealing ring, and the sealing ring is fixedly connected with the box cover. A stirring assembly for preventing yeast from precipitating is arranged at the top of the box cover, the stirring assembly comprises a shell fixedly connected to the top of the box cover, a motor is fixedly connected to the inner side of the shell, and an output shaft of the motor is fixedly connected with a mounting shaft. According to the fresh-keeping packaging device for the high-activity fresh yeast, moisture can be accurately adsorbed and released through the nano-porous silica gel film, the appropriate humidity environment in the box body is maintained, when the humidity is too high, the nano-porous silica gel film absorbs excessive moisture, and when the humidity is too low, the stored moisture is released, the yeast is effectively prevented from going bad due to uncomfortable humidity, and the activity of the yeast is ensured.

The application provides a preparation method of high-purity nano-porous silicon and silicon-carbon composite negative electrode material, wherein a cast silicon alloy is ground to micron size, then placed in a muffle furnace for heat treatment in an air atmosphere, and then the heat-treated sample is placed in an acid solution for chemical corrosion, so that high-purity nano-porous silicon with continuous, open and uniformly distributed pores is formed, and the purity is 92.00-99.99%; a high-molecular compound is polymerized on the surface of the nano-porous silicon, and then the high-molecular compound is pyrolyzed in an inert protective atmosphere in a tube furnace, so that the high-purity nano-porous silicon-carbon composite negative electrode material is prepared. The method provided by the application can simplify the production process of the lithium ion battery negative electrode material and effectively improve the cycle performance and coulomb efficiency of the lithium ion battery negative electrode material.

The invention belongs to the technical field of plant protection, and particularly relates to a Frankliniella occidentalis attractant capsule lure and a preparation method thereof.The method comprises the steps that S1, methylation modified nano-porous silicon is soaked in a Frankliniella occidentalis attractant composition with n-hexane as a solvent, ultrasonic oscillation is conducted for 30-50 min, and then the Frankliniella occidentalis attractant is obtained; loading the Frankliniella occidentalis luring composition on the methylation modified nano-porous silicon; s2, filtering, washing and drying the solution subjected to ultrasonic treatment to obtain nano-porous silicon loaded Frankliniella occidentalis attractant powder; s3, mixing the powder with porous Al2O3 powder according to the mass ratio of 1: 3, and filling a hollow capsule with the mixture to obtain the capsule lure. By utilizing the scheme, the invention provides the Frankliniella occidentalis attractant capsule lure containing the Frankliniella occidentalis attractant composition with long slow release time and strong carrier stress resistance and the preparation method of the Frankliniella occidentalis attractant capsule lure, the release of the Frankliniella occidentalis attractant can be effectively controlled, and the effective duration and the trapping quantity of the attractant can be further prolonged.

The application discloses a preparation method of a copper-doped porous nanosilicon negative electrode material and belongs to the technical field of lithium ion battery negative electrode materials. The copper-doped porous nanosilicon material is prepared by adopting montmorillonite containing copper ions as raw material, adopting anhydrous metal chloride as a molten salt medium, and adopting magnesium as a reducing agent, and the material can be used for a silicon negative electrode material. The nanometer porous characteristic of the silicon negative electrode material is favorable for relieving volume expansion in the process of lithium extraction of silicon and improving the lithium storage capacity of the silicon negative electrode, and the doping of copper can improve the silicon ion conductivity and further relieve the volume expansion effect in the process of lithium insertion of silicon. Through the synergistic effect of the nanometer porosity and the copper doping, the silicon negative electrode material has good lithium storage stability and excellent lithium storage capacity. The montmorillonite is low in price, the molten salt assisted magnesium hot reduction process is low in energy consumption and is not limited by the size of a reaction container, so that the preparation method has the advantages of simple process and great potential for large-scale production.

The invention relates to the technical field of electrochemical energy storage materials, and particularly discloses an integrated silicon-based lithium ion battery negative electrode material and a preparation method thereof. Comprising a monocrystalline silicon interlayer and nano-porous silicon layers located on the two opposite surfaces of the monocrystalline silicon interlayer. The negative electrode material is formed by performing local etching processing on a monocrystalline silicon wafer; the monocrystalline silicon interlayer is formed by monocrystalline silicon which is not etched; the nano porous silicon layer is formed by nano porous silicon formed by etching; and the monocrystalline silicon interlayer and the nano porous silicon layer form an integrated homoplastid with a continuous crystal structure. Through the combination of structural innovation and intrinsic advantages of the material, the electrochemical performance, the cycle stability, the manufacturing process, the energy density, the reliability and the like are obviously improved.

The invention discloses a nano porous silicon negative electrode material as well as a preparation method and application thereof. The preparation method of the nano-porous silicon material provided by the invention comprises the following steps: in a closed environment, gasifying iron powder and depositing the gasified iron powder on the surface of a silicon wafer to form ferromagnetic nanoparticles; and S2, etching the silicon wafer obtained in the step S1 to obtain the nano-porous silicon material. According to the invention, the metal nanoparticles are formed on the silicon surface for covering, so that the silicon is prevented from being oxidized; meanwhile, the metal nanoparticles also participate in dissolution of silicon and formation of mesopores, and can provide a smooth deintercalation-intercalation channel for lithium ions, so that the energy storage and cycle performance of the silicon negative electrode material is greatly improved. The method is simple in process, low in cost, high in efficiency and more suitable for large-scale industrial production.

The invention relates to the technical field of cables, and provides an ultra-fire-resistant low-voltage power cable based on a porous vacuum silicon and alumina fiber composite insulation structure. The objective of the invention is to solve the technical problem that high fire-resistant reliability, structural flexibility, installation adaptability and environmental protection safety are difficult to meet at the same time under extreme fire working conditions due to limited heat insulation performance, large structural rigidity and insufficient material environmental protection performance of a conventional low-voltage fire-resistant cable. According to the technical scheme, each insulating wire core is composed of a conductor and a composite insulating structure, and each composite insulating structure sequentially comprises a porous vacuum silicon composite belt wrapping layer, an aluminum oxide fiber braid layer and a ceramic polyolefin extrusion layer from inside to outside; wherein the porous vacuum silicon composite belt wrapping layer comprises a nano porous silicon material layer facing the conductor and a polyester film layer back to the conductor, and the alumina fiber woven layer is formed by weaving alumina continuous fiber yarns; and gaps of cable cores of the multi-core cable are filled with special-shaped alumina fiber felts, and the outer layer of the multi-core cable is sequentially lapped with a basalt fiber belt and extruded with a low-smoke halogen-free flame-retardant polyolefin sheath.

The invention relates to the technical field of textiles and garments, and particularly discloses warm-keeping knitted underwear and a preparation method thereof. According to the warm-keeping type knitted underwear, the underwear is formed by weaving composite fibers; the composite fiber is prepared from the following raw materials in parts by weight: 55 to 65 parts of maleic anhydride grafted modified polylactic acid, 12 to 18 parts of temperature-sensitive hydrogen bond donor-acceptor compound, 8 to 12 parts of nano porous silicon-based aerogel loaded composite phase change material, 2 to 4 parts of tea saponin-chitosan graft and 1 to 2 parts of polyglycerol ricinoleate. According to the invention, maleic anhydride grafted modified polylactic acid is used as a matrix, a temperature-sensitive hydrogen bond donor-acceptor compound realizes heat regulation through hydrogen bond reversible fracture and formation in a relatively wide temperature range, and the nano-porous silicon-based aerogel loaded composite phase change material plays a phase change temperature regulation role in a comfortable temperature range of a human body; and the comprehensive effects of wide-temperature-range self-adaptive temperature regulation and stable warm keeping are achieved.

The invention belongs to the technical field of agricultural chemistry, and discloses a synergistic amino acid-containing water-soluble fertilizer produced from an acidolysis feather liquid and a preparation method thereof. The fertilizer comprises 30%-50% of acidolysis feather liquid, 2%-8% of a zinc-loaded pH-responsive nano-porous silicon carrier, 1%-5% of a boron-loaded pH-responsive nano-porous silicon carrier and nitrogen, phosphorus and potassium nutrient components, wherein the nano-carrier directionally releases zinc and boron in a rhizosphere subacid environment (pH 5.0-6.5), and keeps stable in neutral-alkaline soil. The invention effectively solves the technical contradiction that the stability and the availability of the traditional chelated fertilizer cannot be obtained at the same time, improves the nutrient utilization efficiency, realizes synergistic interaction of amino acids and trace elements, realizes high-value utilization of agricultural wastes, does not need high-temperature and high-pressure or complex equipment, has good compatibility of the components, is clear and transparent, has no precipitate and no flocculation, and is suitable for industrial production. The system is suitable for various water and fertilizer integrated systems such as drip irrigation and sprinkling irrigation.