4 results about "Silicon nanotube" patented technology

The present application belongs to the field of one-dimensional size nanometer material preparation and application, and particularly relates to a preparation method of a size-controllable hollow silica nanometer tube coating and application of the coating in a super-hydrophobic self-cleaning anti-reflection coating. The coating is prepared by high-temperature treatment of poly(methyl hydrogen siloxane) in an alkaline environment, and the specific preparation method is as follows: preparing a n-heptane or cyclohexane solution of poly(methyl hydrogen siloxane); placing the n-heptane or cyclohexane solution of poly(methyl hydrogen siloxane), ammonia water, ultrapure water and a substrate in a reaction kettle; adjusting the volume ratio of the ammonia water to the ultrapure water and the reaction temperature to prepare hollow nanometer tube coatings with different sizes. The average light transmittance of the coating prepared by the present application can reach 92.44% in the range of 400-800 nm, which is 2.4% higher than that of the substrate, the water contact angle is 156.1°, and the rolling angle is 0.75°. The silica nanometer tube coating has excellent self-cleaning properties.

The invention relates to a preparation method of a silicon nanotube array. The preparation method comprises the following steps: providing a silicon substrate, preparing a nanotube array pattern on the surface of the silicon substrate, and carrying out deep silicon etching by utilizing a Bosh process to form the silicon nanotube array. Wherein in the process of performing deep silicon etching by using the Bosh process, the etching gas is SF6, the passivation gas is C4F8, and the flow ratio R of the SF6 to the C4F8 is 0.8-0.9; the etching power P ranges from 600 W to 800 W; the etching depth D meets the relational expression that D is in direct proportion to PR / (1 + R2). According to the preparation method of the silicon nanotube array disclosed by the invention, the silicon nanotube array of which the side wall roughness is less than 10nm and the depth-to-width ratio is not less than 20: 1 can be obtained in an atypical parameter interval in the prior art. Moreover, according to the method disclosed by the invention, parameter adjustment is carried out based on a relational expression D < PR / (1 + R2), the method is different from a traditional process regulation and control mode depending on a trial-and-error method, and proper process parameters can be quickly and accurately found for the preparation process of the silicon nanotube array with the smooth side wall and the high aspect ratio.

The application discloses a method for preparing a mixed matrix reverse osmosis membrane by using mesoporous silicon nanotubes, and the method is implemented according to the following steps: 1) obtaining a silicon solid rod by using Pluronic F127 block copolymer and cetyltrimethylammonium bromide under the participation of tetraethyl orthosilicate, then removing the surfactant by using hydrochloric acid to further obtain a mesoporous material, and finally etching the mesoporous material by using polyethyleneimine to obtain the mesoporous silicon nanotubes; 2) then, the synthesized mesoporous silicon nanotubes are added into an aqueous phase solution containing m-phenylenediamine and uniformly dispersed, so that the content of the mesoporous silicon nanotubes in the aqueous phase solution is 0.005% w / v to 0.04% w / v, and an aqueous phase solution is obtained; 3) the aqueous phase solution obtained through the step 2) and a uniform benzenetriyl chloride oil phase solution are used to form a polyamide layer on a support layer by using an interfacial polymerization method, and a mixed matrix reverse osmosis membrane is obtained. The method can significantly improve the flux of the reverse osmosis membrane while maintaining a high rejection rate.

Silicon carbide nanowires on carbon species and methods of making and using thereof, and, more particularly, silicon carbide nanowires on coal, graphene, graphite, and fibrous carbon species and methods of making and using thereof. Flash Joule heating and / or microwave reactions are performed in which silicon carbide nanotubes are grown on the surface of a coal-based feedstock, a carbon fiber-based feedstock, or a graphene or graphite feedstock derived from coal or carbon fiber.