Fibrous nanosilicon preparation method

A nano-silicon and fibrous technology, which is applied in the field of preparation of fibrous nano-silicon, can solve the problems of numerous processes and high production costs, achieve the effect of simple equipment and processes, and overcome numerous processes

Inactive Publication Date: 2014-01-01
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the methods for preparing Si (silicon) in the prior art generally have the disadvantages of numerous procedures and high production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Before weighing, the raw material fiber serpentine (SiO 2 ) in a vacuum drying oven (300-1000Pa, 50-80°C, 3-12h), take an appropriate amount of fiber serpentine (SiO 2 ) Grind, pass through a 200-mesh sieve, take samples at a molar ratio of 0.3-3, and mix them evenly; the evenly mixed mixture has a bulk density of 0.4-1.6 g / cm 3 Put it into the reactor, evacuate it to 0.001MPa, and continuously feed high-purity argon gas (purity 99.99%, protective atmosphere) into the reaction device, then raise the temperature to 600 ° C, the sample reacts, keep it for 2 hours, and cool it to room temperature. Stop feeding the protective atmosphere and collect the combustion products; react the obtained combustion products with 100ml of dilute hydrochloric acid with a mass fraction of 5% until the magnesium oxide is completely reacted, then filter or centrifuge the reaction solution under the conditions (6000-16000 rpm, time 5~30min), pour off the supernatant, wash with deionized wate...

Embodiment 2

[0036] Before weighing, the raw material fiber serpentine (SiO 2 ) in a vacuum drying oven (300-1000Pa, 50-80°C, 3-12h), take an appropriate amount of fiber serpentine (SiO 2 ) Grind, pass through a 200-mesh sieve, take samples at a molar ratio of 0.3-3, and mix them evenly; the evenly mixed mixture has a bulk density of 0.4-1.6 g / cm 3 Put it into the reactor, evacuate it to 0.001MPa, and continuously feed high-purity argon gas (purity 99.99%, protective atmosphere) into the reaction device, then raise the temperature to 700 ° C, the sample reacts, keep it for 2 hours, and cool it to room temperature. Stop feeding the protective atmosphere and collect the combustion products; react the obtained combustion products with 100ml of dilute hydrochloric acid with a mass fraction of 10% until the magnesium oxide is completely reacted, then filter or centrifuge the reaction solution under the conditions (6000-16000 rpm, time 5~30min), pour off the supernatant, wash with deionized wat...

Embodiment 3

[0038] Before weighing, the raw material fiber serpentine (SiO 2 ) in a vacuum drying oven (300-1000Pa, 50-80°C, 3-12h), take an appropriate amount of fiber serpentine (SiO 2 ) Grind, pass through a 200-mesh sieve, take samples at a molar ratio of 0.3-3, and mix them evenly; the evenly mixed mixture has a bulk density of 0.4-1.6 g / cm 3 Put it into the reactor, evacuate it to 0.001MPa, and continuously feed high-purity argon gas (purity 99.99%, protective atmosphere) into the reaction device, then raise the temperature to 800°C, the sample reacts, keep the temperature for 3 hours, and cool to room temperature. Stop feeding the protective atmosphere and collect the combustion products; react the obtained combustion products with 100ml of dilute hydrochloric acid with a volume fraction of 15% until the magnesium oxide is completely reacted, then filter or centrifuge the reaction solution under the conditions (6000-16000 rpm, time 5~30min), pour off the supernatant, wash with dei...

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Abstract

The invention discloses a fibrous nanosilicon preparation method. The method is characterized in that the method comprises the following steps: taking magnesium powder and silica-based chrysotile according to a magnesium: silica mole ratio of 0.3-3:1, and uniformly mixing to obtain a mixture; filling the mixture to a reaction apparatus, evacuating, continuously introducing argon to the reaction apparatus, heating to 500-800DEG C, carrying out a heat insulation reaction for 0.3-6h, cooling to room temperature, stopping the introduction of argon, and collecting a product obtained a combustion reaction; and mixing and reacting with dilute hydrochloric acid, filtering or centrifuging a material after the above reaction, washing the obtained solid precipitate with deionized water, drying, and milling to prepare fibrous nanosilicon. The preparation method has the advantages of easily available raw materials, simple apparatus and technology, and environmental protection, and the prepared fibrous nanosilicon has the advantages of excellent strength, excellent creep resistance and excellent high temperature resistance, and has good application prospects in the nanowire field, the switch field, the line field, the high-performance optical fiber field, the energy storage field, the environment treatment field, and the medical and health field.

Description

technical field [0001] The invention belongs to the preparation of silicon and relates to a method for preparing fibrous nano-silicon. The fibrous nano-silicon prepared by the present invention can be used as a visible light luminescent material to be made into nano-devices such as optical sensors. Application prospect. Background technique [0002] Since the discovery of carbon nanotubes by Iijima S in 1991, the special properties of fibrous one-dimensional nanomaterials such as nanofibers, nanowires, nanotubes, and nanorods have attracted widespread attention. It has been widely used in materials such as magnetism, optics, electronics and catalysis. [0003] In the prior art, the methods for preparing Si (silicon) mainly include: magnesia thermal reduction, carbothermal reduction, SiHCl 3 Hydrogenation, electrochemical method, etc. For example: In 2007, Sandhage et al. reported in Nature, 2007, 446(7132): 172-175 a method for preparing porous silicon at low tempera...

Claims

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Application Information

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IPC IPC(8): C01B33/023
Inventor 段涛张红竹文坤刘琨
Owner SOUTHWEAT UNIV OF SCI & TECH
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