Method for prepring three-dimensional dendritic magnetic cobalt nano material through self-assembly of two-dimensional lamellar constitutional units

A magnetic metal and dendritic technology, applied in the field of microwave absorbing materials, can solve the problems of unreported application and achieve the effects of good experimental repeatability, simple preparation process and low production cost

Active Publication Date: 2016-01-20
SHENYANG POLYTECHNIC UNIV
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  • 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 magn

Method used

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  • Method for prepring three-dimensional dendritic magnetic cobalt nano material through self-assembly of two-dimensional lamellar constitutional units
  • Method for prepring three-dimensional dendritic magnetic cobalt nano material through self-assembly of two-dimensional lamellar constitutional units
  • Method for prepring three-dimensional dendritic magnetic cobalt nano material through self-assembly of two-dimensional lamellar constitutional units

Examples

Experimental program
Comparison scheme
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 0.03mol / L solution of cobalt chloride hexahydrate.

[0029] (2) Dissolve sodium hydroxide in distilled water at room temperature to prepare a 0.4mol / 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 0.05mol / L, and the concentration of sodium hypophosphite is 0.8mol / L.

[0032] (5) The solution of step (4) is loaded into the hydrothermal reaction kettle, and at 110 o C temperature reaction 24h. 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 8h. Microstructure such as Figure 8 shown.

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Abstract

The invention relates to a method for preparing a three-dimensional dendritic magnetic cobalt nano material through self-assembly of two-dimensional lamellar constitutional units. As an application of a composite microwave absorbing material, the method is characterized in that the trunk length of the three-dimensional dendritic magnetic cobalt nano material is 2-9 mu m, and the branch length of the material is 1-4 mu m; basic constitutional units are in a lamellar structure, and the particle size of each constitutional unit is 200-500 nm; and the three-dimensional dendritic magnetic cobalt nano material is formed by face-to-face directed connection and growing of the lamellar constitutional units. The method for preparing the three-dimensional dendritic magnetic cobalt nano material comprises the following steps: (1) preparing a cobalt chloride hexahydrate solution; (2) preparing a sodium hydroxide solution; (3) adding the solution is step (2) into the solution in step (1) and mixing the two solutions fully; (4) adding pyromellitic acid and sodium hypophosphite into the solution is step (3) and mixing the mixture fully; and (5) processing the solution in step (4) under a hydrothermal condition, cleaning the obtained product with deionized water and absolute ethyl alcohol, and then drying the product in vacuum, thus obtaining the dendritic magnetic cobalt nano material.

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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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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