Method for directly preparing mesoporous silicon-magnesium composite oxide fiber by electrospinning

A composite oxide and electrospinning technology, which is applied in the direction of inorganic raw materials such as artificial filaments, can solve the problems of difficult to obtain aqueous silicon-magnesium sol, and achieve the effect of good fiber shape, good flexibility and high mesoporous structure

Active Publication Date: 2019-05-31
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 silico

Method used

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  • Method for directly preparing mesoporous silicon-magnesium composite oxide fiber by electrospinning
  • Method for directly preparing mesoporous silicon-magnesium composite oxide fiber by electrospinning
  • Method for directly preparing mesoporous silicon-magnesium composite oxide fiber by electrospinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0072] (i) The citric acid, water, and ethanol are prepared into a citric acid / water / alcohol solution with a molar ratio of acid X: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, stir until the PVA is completely dissolved to obtain the spinning aid "PVA630", add 3.644g of CTAB to it, and stir until it dissolves to obtain "PVA630-3" .

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

[0075] (iv) Add 6.78g MgCl to 40.83g silica sol 2 ·6H 2 O, stir ...

Embodiment 2

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

[0084] As described in Example 1, the difference is that in step (1), phosphoric acid, water, and ethanol are prepared into a phosphoric acid: water: ethanol molar ratio of 0.01:6:2 X acid / water / alcohol solution to obtain acidity 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 includes the following steps:

[0087] As described in Example 1, the difference is that in step (1), citric acid, water, and ethanol are prepared into an aqueous citric acid solution with a citric acid:water molar ratio of 0.01:11 to obtain an acidic hydrolysis catalyst solution CA0. Dissolve 6g of PVA in 94g of water and stir until the PVA is completely dissolved to obtain the spinning aid "PVA6", such as figure 1 Shown; spinning to obtain a silicon-magnesium composite oxide fiber without a high specific surface area.

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Abstract

The invention relates to a method for directly preparing a mesoporous silicon-magnesium composite oxide fiber by electrospinning. In the method, a stable aqueous silicon-magnesium sol spinning solution is provided, and the silicon-magnesium composite oxide fiber can be directly obtained by electrospinning and subsequent heat treatment. The method solves the problem that silicon and magnesium easily generate magnesium silicate precipitation in a water solution, an aqueous solvent is used, acid is used for catalyzing the hydrolysis of common silane, an inorganic magnesium salt is added, the solution pH value and the alcohol content are controlled, and the stable silicon-magnesium sol spinning solution is obtained. The adopted solvent is an aqueous solution of water or alcohol, the heat treatment mode is simple, and the fiber manufacturing process can reduce the cost and meet the environmental protection requirement. The obtained silicon-magnesium composite oxide fiber has a good fiber morphology, a good mesoporous structure and a high specific surface area and is also good in flexibility. The method is simple in process and suitable for mass preparation, and the fiber does not contain impurity metallic elements, does not have potential harm to the human body or the environment and has great potential application value.

Description

Technical field [0001] The invention relates to a method for directly preparing mesoporous silicon-magnesium composite oxide fibers by electrostatic spinning, and belongs 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 a common and widely used inorganic non-metallic material. Silicon-based composite oxide materials are widely used in manufacturing, electric power, chemical, and pharmaceutical industries. And often the development of new silicon-based composite oxide materials will promote its penetration into new application areas. Among 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 are in urgent need of development. Secondly, silicon-magnesium materials, includi...

Claims

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Application Information

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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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