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Magnetic conductive nano-metal/carbon aerogel wave absorbing material and preparation method thereof

A carbon aerogel and wave absorbing material technology, applied in electrical components, antennas, etc., can solve the problems of rare reports, complicated material design and synthesis, and achieve the effect of low density, high specific surface area, and good application prospects

Active Publication Date: 2019-01-25
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, single-functional magnetic or conductive aerogels are often reported in the literature, and the material design and synthesis involved in dual-functional magnetic and conductive aerogels are relatively complicated, and there are few reports so far.

Method used

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  • Magnetic conductive nano-metal/carbon aerogel wave absorbing material and preparation method thereof
  • Magnetic conductive nano-metal/carbon aerogel wave absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1. Mix 8.08g resorcinol and formaldehyde at a molar ratio of 1:2 and stir mechanically until clarified. Use 0.2mol L -1 The volume of the solution was adjusted to 100ml with NaOH solution, and a wet gel was obtained after 3 days of gelation at room temperature. Acid aging of wet gels, solvent exchange, CO 2 After supercritical fluid drying, resorcinol-formaldehyde airgel is obtained, and the airgel is further carbonized, heated to 1050°C at a heating rate of 1.5°C / min, and resorcinol-formaldehyde carbon gas is obtained after constant temperature for 2 hours gel.

[0034] Step 2. Weigh 0.05g PdCl 2 In a beaker, add 45mL EtOH and 5mL 1mol·L -1 HCl is placed in an ultrasonic cleaner for ultrasonic dissolution, and the resorcinol-formaldehyde carbon airgel in step 1 is placed in the above PdCl 2 Take it out after 1 day in the activation solution, rinse with deionized water to remove the PdCl enriched on the surface of the hydrogel 2 , and then placed in the electr...

Embodiment 2

[0038] Step 1. Mix 8.08g of phenol and formaldehyde at a molar ratio of 1:2, stir mechanically until clear, and use 0.2mol·L - 1 Dilute the solution to 100mL with NaOH solution, gel at room temperature for 3 days to obtain a wet gel, pickle and age the wet gel, solvent exchange, CO 2 After the supercritical fluid is dried, the phenol-formaldehyde airgel is obtained, and the airgel is further carbonized, heated to 1050°C at a heating rate of 1.5°C / min, and the phenol-formaldehyde carbon airgel is obtained after constant temperature for 2 hours;

[0039] Step 2. Weigh 0.05g PdCl 2 In a beaker, add 45mL EtOH and 5mL 1mol·L -1 HCl is placed in an ultrasonic cleaner for ultrasonic dissolution, and the phenol-formaldehyde carbon airgel in step 1 is placed in the above-mentioned PdCl 2 Take it out after 1 day in the activation solution, rinse with deionized water to remove the PdCl enriched on the surface of the hydrogel 2 , and then placed in the electroless nickel plating solut...

Embodiment 3

[0043] Step 1. Mix 8.08g of phenol and formaldehyde at a molar ratio of 1:2, stir mechanically until clear, and use 0.2mol·L - 1 Dilute the solution to 100ml with NaOH solution, and get a wet gel after gelling at room temperature for 3 days; pickling and aging the wet gel, solvent exchange, CO 2 After the supercritical fluid is dried, the phenol-formaldehyde airgel is obtained, and the airgel is further carbonized, heated to 1050°C at a heating rate of 1.5°C / min, and the phenol-formaldehyde carbon airgel is obtained after constant temperature for 2 hours;

[0044] Step 2. Weigh 0.05g PdCl 2 In a beaker, add 45mL EtOH and 5mL 1mol·L -1 HCl is placed in an ultrasonic cleaner for ultrasonic dissolution, and the phenol-formaldehyde carbon airgel in step 1 is placed in the above-mentioned PdCl 2 Take it out after 1 day in the activation solution, rinse with deionized water to remove the PdCl enriched on the surface of the hydrogel 2 , and then placed in an electroless nickel pl...

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Abstract

The invention discloses a magnetic conductive nano-metal / carbon airgel absorbing material and the preparation method thereof. The material is formed and prepared from carbon airgel which undergoes sensitization, electroless plating, freeze drying or supercritical drying. The carbon airgel is composed of magnetic metal nano particles and a porous carbon skeleton. The magnetic metal nano particles are distributed evenly on the surface of the carbon airgel and have magnetic force, electrical conductivity, low density, a high specific surface area and a nano-porous structure. Due to the above characteristics, the carbon airgel absorbing material has a good prospect in the field of electromagnetic wave absorption, and it can absorb the wide bands of an electromagnetic wave effectively even with low use amount.

Description

technical field [0001] The invention relates to the technical field of preparation of wave-absorbing materials, in particular to a magnetically conductive nano-metal / carbon airgel wave-absorbing material and a preparation method thereof. Background technique [0002] With the widespread application of optical, electrical, magnetic and other reconnaissance technologies in the military field, the corresponding anti-reconnaissance technology has received more and more attention. Among them, electromagnetic absorbing materials can effectively reduce the radar cross section of weapons and equipment and improve their survival and defense capabilities without changing the shape design of the weapon system, and have become a research hotspot for the military of various countries. An ideal absorbing material needs to meet the requirements of "thin thickness, light weight, wide absorption frequency, and strong absorption capacity". Traditional absorbing materials mainly pass through ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00
CPCH01Q17/00
Inventor 赵海波付志兵王朝阳钟铭龙米睿杨曦袁磊周小草瞿静刘淼
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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