Super-elastic flexible three-dimensional composite ceramic nanofiber block as well as preparation method and application thereof

A three-dimensional composite and nanofiber technology, applied in separation methods, chemical instruments and methods, dispersed particle filtration, etc., can solve the problems of complex preparation methods, limited mechanical properties of ceramic fiber membranes, and long time consumption, and achieve large specific surface area and good performance. Thermal stability and chemical stability, cost reduction effect

Inactive Publication Date: 2021-07-23
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the ceramic fibers obtained by electrospinning are low-dimensional materials, and due to the inevitable shrinkage in the fiber preparation process, it is difficult to obtain large-sized ceramic fiber membranes, and due to the mechanical properties of ceramic fiber membranes, it is difficult to be used in fields such as air filtration. industrialization development
Although low-dimensional ceramic fibers can be assembled into three-dimensional blocks (such as aerogels) by sol-gel methods and other methods, the preparation methods are complicated, time-consuming, and costly.

Method used

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  • Super-elastic flexible three-dimensional composite ceramic nanofiber block as well as preparation method and application thereof
  • Super-elastic flexible three-dimensional composite ceramic nanofiber block as well as preparation method and application thereof
  • Super-elastic flexible three-dimensional composite ceramic nanofiber block as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Preparation of alumina / titania three-dimensional composite ceramic nanofiber blocks with a mass fraction of aluminum of 5% by electrospinning:

[0022] First, prepare the electrospinning precursor. Mix 0.6g of PVP powder with 4.5mL of ethanol, stir overnight to obtain a uniform and transparent solution, add 5mL of acetone, 0.22g of aluminum acetylacetonate, 3mL of acetic acid and 2.5mL of isopropyl titanate into the above solution in sequence, and stir at room temperature to make it completely Dissolved to obtain a yellow and transparent precursor solution.

[0023] Secondly, under the conditions of a voltage of 15kV-20kV, a distance between the metal needle and the receiver of 12.5cm, and a flow rate of 0.5mL / h, the fiber film prepared from the above precursor solution was collected after 2 hours, and the film thickness was 10-30μm Between, the spinning environment temperature is required to be 25°C, and the humidity is 30%-40%.

[0024] Under the condition of 40-...

Embodiment 2

[0029] a. Alumina / titania three-dimensional composite ceramic nanofiber blocks with a mass fraction of aluminum of 15% were prepared by electrospinning:

[0030] First, prepare the electrospinning precursor. Mix 0.6g of PVP powder with 4.5mL of ethanol, stir overnight to obtain a uniform and transparent solution, add 5mL of acetone, 0.73g of aluminum acetylacetonate, 3mL of acetic acid and 2.5mL of isopropyl titanate into the above solution in sequence, and stir at room temperature to make it completely Dissolved to obtain a yellow and transparent precursor solution.

[0031] Secondly, under the conditions of a voltage of 15kV-20kV, a distance between the metal needle and the receiver of 12.5cm, and a flow rate of 0.5mL / h, the fiber film prepared from the above precursor solution was collected after 2 hours, and the film thickness was 10-30μm Between, the spinning environment temperature is required to be 25°C, and the humidity is 30%-40%.

[0032] Under the condition of 40-...

Embodiment 3

[0037] a. Preparation of alumina / titania three-dimensional composite ceramic nanofiber blocks with a mass fraction of aluminum of 30% by electrospinning:

[0038] First, prepare the electrospinning precursor. Mix 0.6g of PVP powder with 4.5mL of ethanol, stir overnight to obtain a uniform and transparent solution, add 5mL of acetone, 1.00g of aluminum acetylacetonate, 3mL of acetic acid and 1.41mL of isopropyl titanate into the above solution in turn, stir at room temperature to make it completely Dissolved to obtain a yellow and transparent precursor solution.

[0039] Secondly, under the conditions of a voltage of 15kV-20kV, a distance between the metal needle and the receiver of 12.5cm, and a flow rate of 0.5mL / h, the fiber film prepared from the above precursor solution was collected after 2 hours, and the film thickness was 10-30μm Between, the spinning environment temperature is required to be 25°C, and the humidity is 30%-40%.

[0040] Under the condition of 40-60wt.%...

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Abstract

The invention discloses a super-elastic flexible three-dimensional composite ceramic nanofiber block as well as a preparation method and application thereof. The preparation method comprises the following steps that: polyvinylpyrrolidone is dissolved in ethanol to obtain a solution serving a spinning precursor solution; a substance source of a ceramic material and a corresponding solvent and auxiliary are added into the precursor solution to form a uniform electrospinning solution, fiber membranes obtained through electrospinning are collected, and the membrane thickness is 10-30 microns; and meanwhile, under the condition that the humidity is 40-60 wt.%, the electrospun fiber membranes are simply overlapped in modes of folding, cutting or the like, adhesion is carried out by utilizing the volatility of solvents of the fiber membranes, and then calcination is carried out in air or other atmospheres to obtain a three-dimensional ceramic fiber block. The obtained three-dimensional ceramic fiber block has rich pore structures, and can be applied to the fields of air purification, especially high-temperature waste gas treatment and the like because of the excellent thermal stability and chemical stability of the ceramic fibers.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional ceramic nanofiber blocks, and in particular relates to a superelastic and flexible three-dimensional composite ceramic nanofiber block and its preparation method and application. Background technique [0002] Ceramic fiber is a kind of fibrous lightweight refractory material, which has the advantages of light weight, high temperature resistance, good thermal stability, low thermal conductivity, small specific heat and mechanical vibration resistance, so it is widely used in machinery, metallurgy, chemical industry, petroleum, ceramics, Glass, electronics and other industries have been widely used. In recent years, due to the continuous rise of global energy prices, energy conservation has become a national strategy in China. Under such a background, ceramic fibers, which can save energy by 10-30% compared with traditional refractory materials such as insulation bricks and castables, have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/46C04B35/622B01D46/54
CPCC04B35/46C04B35/10C04B35/62259C04B35/62236B01D46/546C04B2235/9607
Inventor 代云茜徐婉琳孙岳明
Owner SOUTHEAST UNIV
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