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Preparation method of conductive wood aerogel

An airgel and wood technology, applied in wood treatment, wood heating, impregnating wood, etc., can solve the problems of complex preparation process and no consideration of multi-functional application of materials, etc., to achieve extensive sources, excellent electromagnetic shielding performance, and enhanced electrical conductivity sexual effect

Active Publication Date: 2021-07-16
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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  • Preparation method of conductive wood aerogel

Examples

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 a conductive wood aerogel. The preparation method comprises the following steps: slicing wood in the direction perpendicular to the growth direction, and obtaining a cross section wood base plate; immersing the substrate into a delignification buffer solution, and heating to carry out delignification treatment; soaking the obtained delignification wood base plate in a ferric chloride solution, and then performing freeze drying; sealing the obtained sample and a pyrrole solution together, and performing in-situ synthesis of polypyrrole in wood cell walls by using an in-situ chemical vapor deposition method; then, soaking the sample in a mixed solution of silver nitrate, dimethyl sulfoxide and sodium citrate, wherein dimethyl sulfoxide serves as a reducing agent, sodium citrate serves as a complexing agent, silver nanoparticles are generated on the surface of polypyrrole in situ, the sample is washed in ethyl alcohol, and thus the conductive wood aerogel is obtained. The method is simple in preparation process, mild in reaction condition and beneficial to industrial production, and can be widely applied to the fields of electricity, antibiosis, 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 Applications(China)
IPC IPC(8): B27K3/02B27K5/00B27K5/04B27K3/26B27K3/34B27K3/52B27K3/16B27K3/20B27K3/36
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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