A kind of preparation method of conductive wood aerogel

An airgel and wood technology, applied in the field of composite materials, can solve the problems of multi-functional application of materials and complex preparation process, etc., and achieve the effects of excellent electromagnetic shielding performance, wide sources, and high antibacterial activity

Active Publication Date: 2022-04-26
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the above preparation method is complicated and does not consider the multifunctional application of the material

Method used

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  • A kind of preparation method of conductive wood aerogel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) The balsa wood is sliced ​​along the growth direction to obtain a wood substrate with a thickness of 1.5 mm and a length and width of 22.9×10.2 mm.

[0044](2) The wood substrate obtained in step (1) was rinsed repeatedly with deionized water, and then placed in a vacuum drying oven at 60° C. for 12 hours for later use.

[0045] (3) Put the sample in step (2) into an aqueous solution of 2.5 mol / L NaClO, and soak at room temperature for 12 hours.

[0046] (4) Wash the delignified wood substrate in step (3) successively with ethanol and deionized water, and put the sample into a container filled with FeCl 3 solution in a beaker, and then transferred to a vacuum oven for vacuum impregnation for 2h.

[0047] (5) The sample obtained in step (4) was washed with deionized water to remove excess solution, and freeze-dried at -45° C. for 36 hours.

[0048] (6) The sample obtained in step (5) and a vial of pyrrole (1 mL) were sealed in a beaker, and placed in a refrigerator...

Embodiment 2

[0054] (1) Slice the balsa wood along the growth direction to obtain a wood substrate with a thickness of 1.5 mm and a length and width of 22.9×10.2 mm.

[0055] (2) The wood substrate obtained in step (1) was rinsed repeatedly with deionized water, and then placed in a vacuum drying oven at 60° C. for 12 hours for later use.

[0056] (3) Immerse the wood substrate in step (2) in 3 mol / L ammonia solution for 24 hours.

[0057] (4) Wash the delignified wood substrate in step (3) successively with ethanol and deionized water, and put the sample into a container filled with FeCl 3 solution in a beaker, and then transferred to a vacuum oven for vacuum impregnation for 2h.

[0058] (5) The sample obtained in step (4) was washed with deionized water to remove excess solution, and freeze-dried at -45° C. for 36 hours.

[0059] (6) The sample obtained in step (5) and a vial of pyrrole (1 mL) were sealed in a beaker, and placed in a refrigerator at 0° C. for 7 days.

[0060] (7) Pla...

Embodiment 3

[0065] (1) Slice poplar wood along the growth direction to obtain a wood substrate with a thickness of 1.5 mm and a length and width of 22.9×10.2 mm.

[0066] (2) The wood substrate obtained in step (1) was rinsed repeatedly with deionized water, and then placed in a vacuum drying oven at 60° C. for 12 hours for later use.

[0067] (3) Put the sample in step (2) into an aqueous solution of 2.5 mol / L NaClO, and soak at room temperature for 12 hours.

[0068] (4) Wash the delignified wood substrate in step (3) successively with ethanol and deionized water, and put the sample into a container filled with FeCl 3 solution in a beaker, and then transferred to a vacuum oven for vacuum impregnation for 2h.

[0069] (5) The sample obtained in step (4) was washed with deionized water to remove excess solution, and freeze-dried at -45° C. for 36 hours.

[0070] (6) The sample obtained in step (5) and a vial of pyrrole (1 mL) were sealed in a beaker, and placed in a refrigerator at 0° C...

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Abstract

The invention discloses a preparation method of conductive wood aerogel, which comprises the following steps: cutting wood into slices perpendicular to the growth direction to obtain a cross-section wood substrate; immersing the substrate in a delignification buffer solution and heating for delignification Treatment; immerse the obtained delignified wood substrate in ferric chloride solution and freeze-dry after immersion; then seal the obtained sample with pyrrole solution, and synthesize in situ in the wood cell wall by in situ chemical vapor deposition method Polypyrrole; the sample is then immersed in a mixed solution of silver nitrate, dimethyl sulfoxide, and sodium citrate, where dimethyl sulfoxide acts as a reducing agent and sodium citrate acts as a complexing agent, generated in situ on the surface of polypyrrole Silver nanoparticles, samples were washed in ethanol to obtain conductive wood aerogels. The method of the invention has simple preparation process, mild reaction conditions, is beneficial to industrial production, and can be widely used in the fields of electricity, antibacterial, electromagnetic shielding materials and the like.

Description

technical field [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing a conductive airgel, and belongs to the field of composite materials. Background technique [0002] Airgel is a nano-scale porous solid material formed by sol-gel method, using a certain drying method to replace the liquid phase in the gel with gas. Aerogels have low density and high specific surface area, making them suitable for a variety of electrical devices, such as supercapacitor electrodes, electromagnetic shielding materials, strain sensors, etc. At present, silica aerogels are the most researched, but the loss of strength will limit its application. Another polymer, airgel, is strong, but the materials needed come from non-renewable fossil resources. In recent years, biomass-based aerogels have received increasing attention, and their precursors include bacterial cellulose, chitosan, alginate, and lignocellulose. Among them, cellulo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B1/22H01G11/24H01G11/48B27K3/52B27K5/04B27K3/20
CPCB27K3/025B27K5/001B27K5/0005B27K5/04B27K3/26B27K3/343B27K3/52B27K3/16B27K3/34B27K3/20B27K3/36B27K2240/20
Inventor 张伟业刘毅孙璟萌王蓓蓓郭洪武
Owner BEIJING FORESTRY UNIVERSITY
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