Preparation and application of magnetic nanoring microwave absorbing agent

A magnetic nano-ring, microwave absorbent technology, applied in the directions of nanotechnology, nanotechnology, low-dimensional magnetic materials, etc., can solve the problem of difficult control of the diameter of the ring, and achieve easy industrial application promotion, good dispersion, and low preparation cost. Effect

Active Publication Date: 2015-12-16
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method: generally a circular ring is obtained, and the diameter of the ring is not easy to control
However, there are few reports about elliptical, especially carbon magnetic nanoring microwave absorbers.

Method used

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  • Preparation and application of magnetic nanoring microwave absorbing agent
  • Preparation and application of magnetic nanoring microwave absorbing agent
  • Preparation and application of magnetic nanoring microwave absorbing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Load 0.4 grams of shuttle-shaped iron glycolate nanosheets [patent 201510175533.8] with a major axis length of 165-186 nm in a ceramic ark of 6 cm × 3 cm × 1.5 cm, place it in a single-temperature tube furnace, and heat it at 400 °C under nitrogen protection. °C for 2 hours (heating time is 1 hour). After the reaction was completed, it was cooled to room temperature with the furnace under the protection of nitrogen. The phase of the obtained product, the morphology, structure and selected area electron diffraction pattern observed under the scanning electron microscope and transmission electron microscope are as follows Figure 1 ~ Figure 4 As shown, it can be seen that the product is elliptical Fe 3 o 4 Polycrystalline nanoring microwave absorbers. The structural parameters and static magnetic properties test results of the product are shown in Table 1.

Embodiment 2

[0044] The steps are the same as in Example 1, but the reaction temperature is 300°C. The phase of the obtained product and the morphology observed under the scanning electron microscope are as follows: figure 1 , Figure 5 As shown, it can be seen that the product is elliptical Fe 3 o 4 Nano ring microwave absorber. The structural parameters and static magnetic properties test results of the product are shown in Table 1.

Embodiment 3

[0046] The steps are the same as in Example 1, but the reaction temperature is 600°C. The phase of the obtained product and the morphology observed under the scanning electron microscope are as follows: figure 1 , Figure 6 As shown, it can be seen that the product is elliptical Fe 3 o 4 Nano ring microwave absorber. The structural parameters and static magnetic properties test results of the product are shown in Table 1.

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Abstract

The invention discloses preparation and an application of a magnetic nanoring microwave absorbing agent, and particularly relates to a magnetic nanoring microwave absorbing agent with characteristics of good monodispersity and homogeneity, high magnetic responsiveness, excellent microwave absorbing performance, adjustable size and composition and the like as well as a preparation method and an application of the magnetic nanoring microwave absorbing agent. A magnetic nanoring adopts a polycrystalline structure formed by agglomeration of nanocrystallines and is oval, the length of a long axis is 28-175 nm, the length of a short axis is 18-130 nm, and the ring wall thickness is 7-35 nm; the magnetic nanoring comprises the component of Fe3O4, Fe3O4 / C or Fe / C with a spinel structure; ferric glycolate is taken as a precursor, and the magnetic nanoring is prepared by adopting an inert gas protective carbothermic reduction method-carbonization-solid-phase diffusion growth cooperation mechanism. The preparation and the application of the magnetic nanoring microwave absorbing agent are simple in process, low in cost and high in efficiency and facilitate industrial application and popularization, and the Fe3O4 and the carbon-magnetic nanoring have broad application prospects in the aspects of microwave absorption, a catalyst, an electrode material, a magnetic recording material, a biological sensor, separation or medical imaging.

Description

technical field [0001] The invention relates to the technical field of magnetic nanomaterials, in particular to a simple method for preparing a magnetic nanoring microwave absorber. Background technique [0002] Ring nanostructures possess unique physicochemical properties due to their high geometric symmetry and structural self-enclosure. This has attracted much attention for its potential application value in the fields of light, electricity, magnetism, catalysis, storage and microwave absorption. Numerous studies have shown that annular nanostructures help absorbing materials absorb electromagnetic waves. At present, people have synthesized Co, Ni-Co, Co-Cu, Ni by physical etching technology, microemulsion method, template method and solvothermal method. 80 Fe 20 , Ni 80 Fe 20 / Au / Co, Co / CoO, Co–Sn–O, α-Fe 2 o 3 , Fe 3 o 4 , γ-Fe 2 o 3 , CoFe 2 o 4 and other magnetic nanorings. Among them, physical etching technology generally requires high-quality templates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08B82Y30/00B82Y40/00H01F1/01
CPCB82Y30/00B82Y40/00C01G49/08C01P2002/70C01P2002/72C01P2004/03C01P2006/42H01F1/009H01F1/01
Inventor 童国秀刘云崔婷婷吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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