Carbon-based porous composite wave-absorbing agent based on natural loofah sponge and preparation method of carbon-based porous composite wave-absorbing agent

A wave absorbing agent and natural silk technology, applied in the field of wave absorbing materials, can solve the problems of unfavorable economy and environmental protection, cumbersome experimental process, prolonging the experimental period, etc., and achieve the effects of easy structural integrity, simple process, and simple processing process.

Pending Publication Date: 2021-03-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Before the high-temperature stage calcination of biochar materials in the above literatures, other experimental processes were carried out, such as alkaline activation, acidic ac

Method used

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  • Carbon-based porous composite wave-absorbing agent based on natural loofah sponge and preparation method of carbon-based porous composite wave-absorbing agent
  • Carbon-based porous composite wave-absorbing agent based on natural loofah sponge and preparation method of carbon-based porous composite wave-absorbing agent
  • Carbon-based porous composite wave-absorbing agent based on natural loofah sponge and preparation method of carbon-based porous composite wave-absorbing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step 1: Soak loofah in 0.8mol / L Fe(NO 3 ) 3 aqueous solution and magnetically stirred for 3 h.

[0050] Appropriate process in this step can make loofah fully and Fe(NO 3 ) 3 Mixing, so that Fe ions are evenly distributed outside the loofah fiber and inside the porous pipe.

[0051] Step 2: Take out the fully soaked loofah and put it in an oven to dry at 100°C for 12 hours.

[0052] Step 3: Put the dried loofah into a tube furnace, raise the temperature to 1000° C. under nitrogen atmosphere and keep it warm for 1.5 hours. After the furnace temperature is cooled to room temperature, the sample is taken out, and the obtained sample is the carbon-based porous absorbing material. The SEM images of the samples are shown in figure 2 Medium (g,h), absorbing performance see Figure 4 Middle (d).

[0053] figure 1 A cross-sectional view of the above-mentioned carbon-based multi-level porous absorbing material is shown.

Embodiment 2

[0055] Step 1: soak the loofah in 1.0mol / L FeCl 3 aqueous solution and magnetically stirred for 5 h.

[0056] Appropriate process in this step can make loofah fully and FeCl 3 Mixing, so that Fe ions are evenly distributed outside the loofah fiber and inside the porous pipe.

[0057] Step 2: Take out the fully soaked loofah and put it into an oven to dry at 90°C for 15 hours.

[0058] Step 3: put the dried loofah into a tube furnace, raise the temperature to 900° C. under a nitrogen atmosphere and keep it warm for 2.0 hours. After the furnace temperature is cooled to room temperature, the sample is taken out, and the obtained sample is the carbon-based porous absorbing material. The SEM images of the samples are shown in figure 2 In (e,f), the absorbing performance see Figure 4 Middle (c).

Embodiment 3

[0060] Step 1: Soak the loofah in 0.8 mol / L ferric sulfate aqueous solution and magnetically stir for 7 hours.

[0061] An appropriate process in this step can fully mix the loofah with ferric sulfate, so that Fe ions are evenly distributed outside the loofah fiber and inside the porous pipe.

[0062] Step 2: Take out the fully soaked loofah and put it in an oven to dry at 80°C for 24 hours.

[0063] Step 3: Put the dried loofah into a tube furnace, raise the temperature to 800° C. under a nitrogen atmosphere and keep it warm for 2.5 hours. After the furnace temperature is cooled to room temperature, the sample is taken out, and the obtained sample is the carbon-based porous absorbing material. The SEM images of the samples are shown in figure 2 In (c,d), the absorbing performance see Figure 4 Middle (b).

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Abstract

The invention belongs to the field of wave-absorbing materials, and relates to a carbon-based porous composite wave-absorbing agent based on natural loofah sponge and a preparation method of the carbon-based porous composite wave-absorbing agent. Firstly, natural loofah sponge is placed in an aqueous solution of ferric nitrate, ferric chloride or ferric sulfate to be soaked, and then the carbon-based wave-absorbing material with the multistage porous structure is obtained through a one-step carbonization method. The diameter of the calcined loofah sponge fiber is 200-300 microns, and nanoscaleiron or oxide particles of the nanoscale iron are uniformly distributed on the surface and inside the fiber. The material has relatively high dielectric loss and relatively good impedance matching characteristic, so that excellent wave-absorbing performance is obtained. When the thickness of the sample is 1.5 mm, the lowest reflection loss value can reach -48.9 dB. The invention provides a new idea for large-scale preparation of the wave-absorbing material with low quality, small thickness and high absorption strength.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, in particular to a carbon-based porous composite wave-absorbing agent based on natural loofah and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In recent years, with the development of electronic communication technology, people pay more and more attention to the harm of electromagnetic pollution to the environment and human body. At the same time, the need for military secrecy also puts forward higher requirements for electromagnetic wave absorbing materials. Traditional absorbing materials are made of Fe, Co, Ni and other metals and their oxi...

Claims

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Application Information

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IPC IPC(8): C01B32/05C09K3/00H05K9/00C21B13/00
CPCC01B32/05C01B32/205C09K3/00H05K9/00C21B13/00C01P2002/72C01P2004/03
Inventor 于美杰郑奇王成国刘似玉梁学琛
Owner SHANDONG UNIV
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