Preparation method of microwave absorbing material taking MOFs molecular structure as template

A microwave-absorbing material and molecular structure technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as high equipment requirements, complicated methods, and high production costs, and achieve simple follow-up processing, simple preparation processes, and production low cost effect

Active Publication Date: 2015-05-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: Aiming at the problems of complex methods, high equipment requirements and high production cost in the current preparation method of porous carbon-coated soft magnetic metal microwave absorbing materials, the technical pro

Method used

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  • Preparation method of microwave absorbing material taking MOFs molecular structure as template
  • Preparation method of microwave absorbing material taking MOFs molecular structure as template
  • Preparation method of microwave absorbing material taking MOFs molecular structure as template

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Embodiment 1

[0027] A method for preparing microwave absorbing material using MOFs molecular structure as a template includes the following steps:

[0028] Step 1. According to the previously reported methods (Lisong Xiao, Jiangtian Li, Dermot F. Brougham, Eoin K. Fox, Neus Feliu, Alexey Bushmelev, Annette Schmidt, Natascha Mertens, Fabian Kiessling, Martin Valldor, Bengt Fadeel, and Sanjay Mathur. Water-Soluble Superparamagnetic Magnetite Nanoparticles with Biocompatible Coating for Enhanced Magnetic Resonance Imaging. ACSNANO, 2011, 5, 6315-6324) Hydrothermal synthesis of 1~5 nm water-soluble Fe 3 O 4 Nano particles, Fe 3 O 4 Nano particles are dispersed in 10ml methanol solution for use, Fe 3 O 4 Fe in methanol solution 3 O 4 The concentration is 20mg / ml;

[0029] Step 2. Disperse 2.63 g of 2-methylimidazole and 0.5 mL of the step 1 solution in 40 ml of methanol solution ultrasonically, and mark the resulting solution as A solution; at the same time, 500 mg of CoCl 2 Dissolve 600mg of polyvin...

Embodiment 2

[0033] Step 1. According to the previously reported methods (Lisong Xiao, Jiangtian Li, Dermot F. Brougham, Eoin K. Fox, Neus Feliu, Alexey Bushmelev, Annette Schmidt, Natascha Mertens, Fabian Kiessling, Martin Valldor, Bengt Fadeel, and Sanjay Mathur. Water-Soluble Superparamagnetic Magnetite Nanoparticles with Biocompatible Coating for Enhanced Magnetic Resonance Imaging. ACSNANO, 2011, 5, 6315-6324) Hydrothermal synthesis of 1~5 nm water-soluble Fe 3 O 4 Nano particles, Fe 3 O 4 Nano particles are dispersed in 10ml methanol solution for use, Fe 3 O 4 Fe in methanol solution 3 O 4 The concentration is 23mg / ml;

[0034] Step 2. Disperse 2.63 g of 2-methylimidazole and 1 mL of the solution of step 1 ultrasonically in 40 ml of methanol solution, and mark the resulting solution as A solution; at the same time, 500 mg of CoCl 2 Dissolve 600mg of polyvinylpyrrolidone K30 in 40ml methanol solution, and mark the obtained solution as B solution;

[0035] Step 3. Under mechanical stirring, ...

Embodiment 3

[0038] Step 1, same as embodiment 1;

[0039] Step 2. Disperse 2.63 g of 2-methylimidazole and 2 mL of the solution of step 1 in 40 ml of methanol solution ultrasonically, label the resulting solution as A solution; at the same time, 500 mg of CoCl 2 Dissolve 600mg of polyvinylpyrrolidone K30 in 40ml methanol solution, and mark the obtained solution as B solution;

[0040] Step 3. Under mechanical stirring, add liquid B from step 2 to liquid A drop by drop. After the two solutions are mixed, continue to stir for 4 hours, then leave the mixed solution to stand and age for 24 hours, and finally magnetically separate the solution , Get a solid powder, mark the solid powder as Fe 3 O 4 ZIF-67-2;

[0041] Step 4. Calcining the solid powder of step 3 in a nitrogen atmosphere for 1 hour at a calcination temperature of 700°C, where the heating rate is 3°C / min, to obtain porous carbon-coated Fe X Co 1-x Alloy, label the product as C-Fe 3 O 4 ZIF-67-2.

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Abstract

The invention discloses a preparation method of a microwave absorbing material taking a MOFs molecular structure as a template, which comprises the following steps: synthesizing water-soluble Fe3O4 nanoparticles by using a hydrothermal method, and dispersing the Fe3O4 nanoparticles in a methanol solution for standby application; ultrasonically dispersing a required amount of 2-methylimidazole and the solution obtained in the step 1 in a methanol solution, and marking the obtained solution as liquid A; dissolving a required amount of CoCl2 and polyvinylpyrrolidone K30 in a methanol solution, and marking the obtained solution as liquid B; under the condition of mechanical agitation, gradually adding the liquid B in the liquid A, and after the two kinds of liquid are mixed, continuing to agitate for several hours, standing the obtained mixed solution, and carrying out magnetic separation processing, so that solid powder is obtained; and calcinating the solid powder obtained in the step 3 for 0.5-6 hours in a nitrogen atmosphere, so that a porous carbon coated FeXCo(1-x) alloy can be obtained. The preparation method disclosed by the invention is low in production cost, simple in preparation process, and suitable for industrialized mass production.

Description

Technical field [0001] The invention relates to a method for preparing a microwave absorbing material using MOFs molecular structure as a template, and belongs to the technical field of microwave absorbing materials. Background technique [0002] With the continuous development of electromagnetic wave technology, electromagnetic interference has become more and more prominent in people's lives, which poses a great threat to human life and safety. In addition, radar wave shielding technology has also received extensive attention in the military field. The absorbing material is one of the important factors affecting electromagnetic wave shielding. Considering the actual application conditions, light weight, thinner coating thickness, strong absorption strength, and wider frequency band are the most basic requirements for absorbing materials. At present, in order to meet the two indicators of light weight and thinner coating thickness, magnetic materials and carbon materials are ge...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 姬广斌张兴淼刘伟王敏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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