A method for directly preparing mesoporous silicon-magnesium composite oxide fibers by electrospinning

A composite oxide and electrospinning technology, which is applied in the direction of inorganic raw material artificial filaments, etc., can solve the problems of difficult to obtain water-based silicon-magnesium sol, etc., and achieve the effect of simple heat treatment, strong flexibility and high purity of components

Active Publication Date: 2021-06-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since silicon and magnesium easily form magnesium silicate precipitation when they meet water, it is difficult to obtain a stable water-based silicon-magnesium sol, which has also become a technical problem for the direct preparation of silicon-magnesium composite oxide fibers by electrospinning

Method used

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  • A method for directly preparing mesoporous silicon-magnesium composite oxide fibers by electrospinning
  • A method for directly preparing mesoporous silicon-magnesium composite oxide fibers by electrospinning
  • A method for directly preparing mesoporous silicon-magnesium composite oxide fibers by electrospinning

Examples

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Embodiment 1

[0070] A method for directly preparing mesoporous silicon-magnesium composite oxide fibers by electrospinning, comprising the following steps:

[0071] (1) Preparation of silicon magnesium sol spinning solution

[0072] (i) citric acid, water, and ethanol are made into acid X: water: a citric acid / water / alcohol solution with a molar ratio of water: ethanol of 0.01:6:2 to obtain acidic hydrolysis catalytic solution CA62.

[0073] (ii) Dissolve 6g of PVA in 94g of ethanol with a mass fraction of 30% ethanol in aqueous solution, stir until the PVA is completely dissolved to obtain the spinning aid solution "PVA630", add 3.644g of CTAB to it, stir until dissolved to obtain "PVA630-3" .

[0074] (iii) 20 g of the hydrolysis catalytic solution CA was added dropwise to 20.833 g of tetraethyl orthosilicate (TEOS) under magnetic stirring, and the stirring was continued for 6 hours to allow the hydrolysis reaction to fully proceed to obtain a hydrolyzed silica sol.

[0075] (iv) Add 6...

Embodiment 2

[0083] A method for directly preparing mesoporous silicon-magnesium composite oxide fibers by electrospinning, comprising the following steps:

[0084] As described in Example 1, the difference is that in step (1), phosphoric acid, water and ethanol are made into phosphoric acid: water: the mol ratio of ethanol is 0.01:6:2 X acid / water / alcohol solution to obtain acidic Hydrolysis catalytic solution PA62. Get the precursor spinning solution, such as figure 1 shown.

Embodiment 3

[0086] A method for directly preparing mesoporous silicon-magnesium composite oxide fibers by electrospinning, comprising the following steps:

[0087] As described in Example 1, the difference is that in step (1), citric acid, water, and ethanol are made into citric acid: the mol ratio of water is an aqueous citric acid solution of 0.01:11 to obtain acidic hydrolysis catalytic solution CA0. Dissolve 6g of PVA in 94g of water, stir until the PVA is completely dissolved to obtain the spinning aid solution "PVA6", such as figure 1 Shown; Carry out spinning, obtain the silicon-magnesium composite oxide fiber that does not possess high specific surface area.

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Abstract

The invention relates to a method for directly preparing mesoporous silicon-magnesium composite oxide fibers by electrospinning. The method provides a stable water-based silicon-magnesium sol spinning solution, which can directly obtain silicon-magnesium composite oxide fibers through electrospinning and subsequent heat treatment. The present invention overcomes the difficult problem that magnesium silicate is easily precipitated in water solution, adopts water solvent, hydrolyzes commonly used silane through acid catalysis, adds inorganic magnesium salt, controls the pH value of the solution and alcohol content, and obtains stable silicon Magnesium sol spinning solution. The solvent used is water or alcohol aqueous solution, the heat treatment method is simple, the manufacturing process of the fiber can not only reduce the cost, but also meet the requirement of environmental protection. The obtained silicon-magnesium composite oxide fiber not only has good fiber shape, mesoporous structure and high specific surface area, but also has good flexibility. The process of the invention is simple, suitable for mass production, the fiber does not contain impurity metal elements, has no potential harm to human body and environment, and has many potential application values.

Description

technical field [0001] The invention relates to a method for directly preparing mesoporous silicon-magnesium composite oxide fibers by electrospinning, belonging to the field of inorganic non-metallic materials. Background technique [0002] Due to the abundant reserves of silicon in the earth's crust, silicon-based composite oxide materials have become common and widely used inorganic non-metallic materials. Silicon-based composite oxide materials are widely used in manufacturing, power industry, chemical industry, pharmaceutical industry and other fields. And often the development of new silicon-based composite oxide materials will promote its penetration into new application fields. Among the silicon-based composite oxide materials, silicon-magnesium materials have unique advantages and have been widely concerned by researchers in recent years. First of all, my country's magnesium resources are very rich and need to be developed urgently. Secondly, silicon-magnesium ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08
Inventor 王新强许崇贺靳晓彤许东张光辉朱陆益刘雪松
Owner SHANDONG UNIV
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