Preparation method of Ni-Co alloy embedded N-doped graphite carbon capsule composite wave-absorbing material

A composite wave absorbing material, graphite carbon technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of harsh reaction conditions, waste of time and raw materials, etc., and achieve the effect of good electromagnetic wave absorption performance

Active Publication Date: 2019-09-27
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Not only waste of time and raw materia

Method used

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  • Preparation method of Ni-Co alloy embedded N-doped graphite carbon capsule composite wave-absorbing material
  • Preparation method of Ni-Co alloy embedded N-doped graphite carbon capsule composite wave-absorbing material
  • Preparation method of Ni-Co alloy embedded N-doped graphite carbon capsule composite wave-absorbing material

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0025] Example 1 Preparation of Ni-Co alloy embedded N-doped graphite-like carbon capsule composite absorbing material Air@NCs€Ni-Co-1

[0026] 1) Preparation of Ni(OH) 2 / ZIF-67-1

[0027] 1.1) Ni(OH) 2 Preparation of methanol solution

[0028] NiCl 2 ·6H 2 The aqueous solution of O is added to the NaOH solution, ultrasonically stirred for 2h, washed with water and centrifuged until the solution is neutral, and dried to prepare a certain concentration of Ni(OH) 2 Methanol solution with a concentration of 40mg / mL.

[0029] 1. Ni(OH) 2 / ZIF-67-1 Preparation

[0030] 1.2) Add 0.6g PVP, 1g CoCl 2 ·6H 2 O, 40mL methanol is magnetically stirred for 10min as solution 1; take 0.5mL Ni(OH) 2 The methanol solution was dispersed in 2.63g of 40mL dimethylimidazole methanol solution, and ultrasonic stirring for 10min was recorded as solution 2. The solution 2 was added dropwise to solution 1, after mechanical stirring for 2h, after standing at room temperature, ethanol washing and centrifugal separ...

Example Embodiment

[0041] Example 2 Preparation of Ni-Co alloy embedded N-doped graphite-like carbon capsule composite absorbing material Air@NCs€Ni-Co-2

[0042] 1) Preparation of Ni(OH) 2 / ZIF-67-2

[0043] 1.1) Ni(OH) 2 Preparation of methanol solution: same as in Example 1.

[0044] 1.2) Preparation of Ni(OH) 2 / ZIF-67-2

[0045] Add 0.6g PVP, 1.6g CoCl 2 ·6H 2 O, 40mL methanol is magnetically stirred for 10min and recorded as solution 1; measure 0mL Ni(OH) 2 The methanol solution was dispersed in 2.63g of 40mL dimethylimidazole methanol solution, and ultrasonically stirred for 10min as solution 2. The solution 2 was added dropwise to solution 1, after mechanical stirring for 4h, the ethanol was washed and centrifuged after standing at room temperature. Vacuum drying to obtain intermediate Ni(OH) 2 / ZIF-67-2.

[0046] 2) Preparation of Ni(OH) 2 / ZIF-67@PDA-2

[0047] 0.2g Ni(OH) 2 / ZIF-67, 0.4g of dopamine hydrochloride and 0.4g of THAM were stirred in an ice-water bath for 10 minutes, followed by mec...

Example Embodiment

[0050] Example 3 Preparation of Ni-Co alloy embedded N-doped graphite-like carbon capsule composite absorbing material Air@NCs€Ni-Co-3

[0051] 1) Preparation of Ni(OH) 2 / ZIF-67-3

[0052] 1.1) Preparation of Ni(OH) 2 Methanol solution: the same as in Example 1.

[0053] 1.2) Preparation of Ni(OH) 2 / ZIF-67-3

[0054] Add 0.6g PVP, 0.5g CoCl 2 ·6H 2 O, 40mL methanol is magnetically stirred for 10min and recorded as solution 1; measure 2mL of Ni(OH) 2 The methanol solution was dispersed in 2.63g of 40mL dimethylimidazole methanol solution, and ultrasonic stirring for 10min was recorded as solution 2. The solution 2 was added dropwise to solution 1, after mechanical stirring for 2h, after standing at room temperature, ethanol washing and centrifugal separation, Vacuum drying to obtain intermediate Ni(OH) 2 / ZIF-67-3.

[0055] 2) Ni(OH) 2 / ZIF-67@PDA-3 preparation;

[0056] 0.2g Ni(OH) 2 / ZIF-67, 0.4g of dopamine hydrochloride and 0.32g of THAM under ice-water bath, ultrasonic stirring fo...

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Abstract

The invention provides a preparation method of an Ni-Co alloy embedded N-doped graphite carbon capsule composite wave-absorbing material, and belongs to the field of synthesis of composite materials. The method is characterized in that Ni(OH)2 particles are designed and synthesized, an Ni(OH)2 methanol solution is prepared, and Ni(OH)2/ZIF-67 is synthesized by adding a certain quantity of the Ni(OH)2 solution during the synthesis of ZIF-67; the Ni(OH)2/ZIF-67 is taken as a template, trishydroxymethylaminomethane is taken as a buffer agent, in situ polymerization of dopamine hydrochloride is carried out on the surface to form Ni(OH)2/ZIF-67@PDA, the ZIF template is subjected to self-etching during dopamine coating, and a hollow dodecahedral capsule is formed; high-temperature calcination and aftertreatment are carried out to prepare the Ni-Co alloy embedded N-doped graphite carbon capsule composite wave-absorbing material (Air@NCs euro Ni-Co). The synthetic method provided by the invention has universality, and N-doped graphite carbon capsule composite wave-absorbing materials embedded with different alloys (Fe-Co, Co-Cu, Co-Zn, FeCoNi, FeCoZn ternary alloy, and the like) can be synthesized. The Ni-Co alloy embedded N-doped graphite carbon capsule composite wave-absorbing material prepared by a three-step method has good wave-absorbing properties.

Description

technical field [0001] The invention belongs to the field of composite material synthesis, and relates to a novel preparation method of a Ni-Co alloy embedded N-doped graphite-like carbon capsule composite wave-absorbing material. Background technique [0002] With the improvement of people's living standards and the continuous updating of various electronic equipment, electromagnetic radiation is flooding around us. Electromagnetic pollution has become another major pollution source after water pollution, air pollution, and noise pollution, seriously endangering human beings. health. In addition, modern warfare in the military has been oriented towards informationization, and stealth technology is becoming more and more important. Electromagnetic wave absorbing materials are the core of radar stealth technology, so absorbing materials have become a hot spot in military development. [0003] At present, people are paying attention to composite absorbing materials, because ...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 陈平邱红芳朱晓宇于祺熊需海王静
Owner DALIAN UNIV OF TECH
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