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Method for preparing silicon oxide nanofiber

A nanofiber and silicon oxide technology, applied in the field of nanomaterials, can solve the problems of many nanowire products, poor flexibility, high synthesis temperature, etc., and achieve good product reproducibility, convenient and efficient preparation method, and high purity Effect

Inactive Publication Date: 2016-05-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high synthesis temperature, there are often more defects in the nanowire product and poor flexibility.
So far, there is still a lack of effective methods for large-scale preparation of highly flexible silica nanofibers with low energy consumption.

Method used

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  • Method for preparing silicon oxide nanofiber
  • Method for preparing silicon oxide nanofiber
  • Method for preparing silicon oxide nanofiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 3.75 g of SiO with a mass fraction of 30% 2 Silica sol (basic), add 37.5 ml of distilled water. After stirring and ultrasonically dispersing evenly, weigh 15.14 grams of Fe(NO 3 ) 3 .9H 2 O (ferric nitrate nonahydrate) was added to the aqueous silica sol solution and stirred for 15 minutes until the ferric nitrate was completely dissolved.

[0032] Subsequently, the above solution was slowly added dropwise into a flask filled with 60 ml of ethylenediamine liquid, and magnetic stirring (500 rpm) was performed during the dropwise addition. After the dropwise addition of the solution was completed, the emulsion was stirred for 15 hours to fully mix the system uniformly to obtain a mixed solution.

[0033] The above mixed solution was transferred into a 150 ml polytetrafluoroethylene-lined stainless steel reaction kettle, sealed and left to stand in an oven at 180 degrees Celsius for 4 days to carry out hydrothermal reaction.

[0034] After the reaction was compl...

Embodiment 2

[0041] Weigh 3.75 g of 30% basic SiO 2 Silica sol, add 37.5 ml of distilled water. After stirring and ultrasonically dispersing evenly, weigh 6.36 g of AgNO 3 (Silver nitrate) was added to the aqueous solution of silica sol, and stirred for 20 minutes until the silver nitrate was completely dissolved.

[0042] Subsequently, the above solution was slowly added dropwise into a flask filled with 60 ml of ethylenediamine liquid, and magnetic stirring (500 rpm) was performed during the dropwise addition. After the dropwise addition of the solution was completed, the emulsion was stirred for 12 hours to fully mix the system uniformly to obtain a mixed solution.

[0043] The above mixed solution was transferred into a 150 ml polytetrafluoroethylene-lined stainless steel reaction kettle, sealed and left to stand in an oven at 170 degrees Celsius for 4 days.

[0044] After the reaction was complete, the reactor was taken out and cooled to room temperature. The precipitates in the r...

Embodiment 3

[0048] Weigh 15 g of 30% Alkaline SiO 2 Silica sol, add 150 ml of distilled water. After stirring and ultrasonically dispersing evenly, weigh 30 grams of Fe(NO 3 ) 3 .9H 2 O (ferric nitrate nonahydrate) was added to the aqueous silica sol solution and stirred for 30 minutes until the silver nitrate was completely dissolved.

[0049] Subsequently, the above solution was slowly added dropwise into a flask filled with 240 ml of ethylenediamine liquid, and magnetic stirring (500 rpm) was carried out during the dropwise addition. After the dropwise addition of the solution was completed, the emulsion was stirred for 15 hours to fully mix the system uniformly to obtain a mixed solution.

[0050] The above mixed solution was moved into a 1L 1Cr18Ni9Ti high temperature and high pressure stainless steel reaction kettle, the pressure inside the kettle was maintained at 2MPa, and the reaction was carried out at a temperature of 170 degrees Celsius for 3 days.

[0051] After the reac...

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Abstract

The invention discloses a method for preparing silicon oxide nanofiber. The method comprises the following steps of mixing silica sol with a nitrate solution, performing ultrasonic dispersion on the solution, adding ethylenediamine after the dissolution of the nitrate solution, and stirring uniformly to obtain a mixed solution; putting the mixed solution into a stainless steel reaction kettle with a polytetrafluoroethylene liner, standing the reaction kettle in a high-temperature baking oven after the closing of the reaction kettle, and performing a hydrothermal reaction; taking out the reaction kettle and cooling the reaction kettle to room temperature after the completion of the reaction, collecting precipitates in the reaction kettle, and washing the precipitates to obtain a silicon oxide nanofiber crude product; adding the silicon oxide nanofiber crude product into a hydrochloric acid solution, stirring in a thermostatic water bath, removing impurity components from the silicon oxide nanofiber crude product, and performing centrifugal separation to obtain a silicon oxide nanofiber finished product. The method disclosed by the invention has the advantages that not only can the high energy consumption in a nanofiber preparation process through a traditional chemical vapor deposition and thermal evaporation technology be avoided, but also the production is easily expanded by utilization of a hydrothermal synthesis technology.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing bendable silicon oxide nanofibers with high flexibility and flame retardant properties. Background technique [0002] In the automation and intelligence process of oil and gas storage and transportation and oil field development, the development of fiber optic sensors has become a hot spot in the current dynamic monitoring work. However, optical fibers have poor mechanical properties. The core part is high refractive index silica glass fiber, the mechanical strength is only about 0.2GPa, and it is fragile. Due to transportation problems and human negligence of installation operators, most optical fibers cannot be used normally at the initial stage of installation. Therefore, it greatly limits the large-scale promotion of this technology in oil field enterprises. While ensuring mechanical strength, developing a silica fiber materia...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82Y30/00B82Y40/00
CPCC01B33/12B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/04C01P2004/16C01P2004/61
Inventor 赵宇鑫张卫华陶彬单晓雯甄永乾贾光
Owner CHINA PETROLEUM & CHEM CORP
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