Self-assembly of a two-dimensional sheet-like constituent unit into a three-dimensional dendritic magnetic cobalt nanomaterial

A magnetic metal and dendritic technology, which is applied in the field of microwave absorbing materials, can solve the problems that have not been reported in the application, and achieve the effects of good repeatability, mild reaction conditions, and simple equipment

Active Publication Date: 2017-08-01
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the self-assembly of two-dimensional sheet-like constituent units into three-dimensional dendritic magnetic metal cobalt nanomaterials and its application in the field of microwave absorption have not been reported.

Method used

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  • Self-assembly of a two-dimensional sheet-like constituent unit into a three-dimensional dendritic magnetic cobalt nanomaterial
  • Self-assembly of a two-dimensional sheet-like constituent unit into a three-dimensional dendritic magnetic cobalt nanomaterial
  • Self-assembly of a two-dimensional sheet-like constituent unit into a three-dimensional dendritic magnetic cobalt nanomaterial

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The two-dimensional sheet-like constituent units are self-assembled into a three-dimensional dendritic magnetic metal cobalt nanomaterial, and the preparation steps are as follows.

[0028] (1) Dissolve cobalt chloride hexahydrate in distilled water at room temperature to prepare a 0.03 mol / L solution of cobalt chloride hexahydrate.

[0029] (2) Dissolve sodium hydroxide in distilled water at room temperature to prepare a 0.4 mol / L sodium hydroxide solution.

[0030] (3) Add the solution of step (2) into the solution of step (1) and mix well.

[0031] (4) Add pyromellitic acid and sodium hypophosphite to the solution in step (3) and mix thoroughly. The concentration of pyromellitic acid is 0.05 mol / L, and the concentration of sodium hypophosphite is 0.8 mol / L.

[0032] (5) The solution of step (4) is loaded into the hydrothermal reaction kettle, and at 110 o C temperature for 24 h. The product is washed with deionized water and absolute ethanol in sequence, and then...

Embodiment 2

[0036] The difference from Example 1 is that the concentration of pyromellitic acid is 0.015 mol / L. Microstructure such as Figure 7 shown.

Embodiment 3

[0038] The difference from Example 1 is: hydrothermal treatment for 8 h. Microstructure such as Figure 8 shown.

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Abstract

A two-dimensional sheet-like component unit self-assembles into a three-dimensional dendritic magnetic cobalt nanomaterial, which is used as a composite microwave absorbing material. Its characteristics are that the backbone length of the three-dimensional dendritic magnetic cobalt nanomaterial is 2‑9 μm, and the branch length is 1‑ 4 μm, the basic constituent unit is a sheet structure, and its particle size is 200-500 nm. The three-dimensional dendritic magnetic metal cobalt nanomaterial is composed of the face-face oriented connection growth of the sheet-like constituent units; its preparation method: (1) Prepare six Cobalt chloride hydrate solution; (2) Prepare sodium hydroxide solution; (3) Add the solution of step (2) to the solution of step (1) and mix thoroughly; (4) Add pyromellitic acid and sodium hypophosphite Mix well with the solution in step (3); (5) treat the solution in step (4) under hydrothermal conditions, wash the product with deionized water and absolute ethanol, and then dry it in a vacuum to obtain dendritic magnetic metal cobalt nanomaterials.

Description

technical field [0001] The invention relates to a microwave absorbing material, in particular to a two-dimensional sheet-like constituent unit self-assembled into a three-dimensional dendritic magnetic metal cobalt nanomaterial and its preparation method and application, belonging to the field of electromagnetic wave absorption. Background technique [0002] With the rapid development of electronic information technology, the problem of electromagnetic interference is becoming more and more serious. Microwave absorbing materials can absorb electromagnetic waves incident inside the material and convert them into heat or other forms of energy, thereby reducing the microwave reflection cross section. Such materials have been widely used in military and civilian fields such as electromagnetic pollution shielding and stealth technology. At present, the more common radar wave absorbing materials can be divided into two types according to the electromagnetic loss mechanism: dielec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 王晓磊史桂梅史发年徐舸于锦张志东
Owner SHENYANG POLYTECHNIC UNIV
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