A microwave absorbing material composited with reduced graphene oxide and nano-cerium oxide and its preparation method

A technology of microwave absorbing materials and nano-cerium oxide, which is applied in chemical instruments and methods, and other chemical processes, can solve problems such as thinness, lightness, width, strength, insufficient absorption strength, and narrow absorption frequency band of microwave-absorbing materials. Achieve the effects of low cost, strong microwave absorption, and wide absorption frequency

Active Publication Date: 2018-02-16
ANHUI UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The main disadvantages of traditional absorbing materials, such as ferrite, graphite, and ceramic materials, are high density, narrow absorption frequency band, and insufficient absorption strength, etc., so they cannot meet the requirements of "thin, light, wide, and strong" absorbing materials

Method used

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  • A microwave absorbing material composited with reduced graphene oxide and nano-cerium oxide and its preparation method
  • A microwave absorbing material composited with reduced graphene oxide and nano-cerium oxide and its preparation method
  • A microwave absorbing material composited with reduced graphene oxide and nano-cerium oxide and its preparation method

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Embodiment Construction

[0036] Below in conjunction with embodiment, the present invention will be further described.

[0037] The raw materials used and their sources are as follows:

[0038] (1) Natural graphite flakes: 325 mesh, purity ≥99%, Qingdao Huatai Durable Sealing Co., Ltd.

[0039] (2) Potassium permanganate: Purity AR, Sinopharm Chemical Reagent Co., Ltd.

[0040] (3) Hydrogen peroxide: Purity AR, Sinopharm Chemical Reagent Co., Ltd.

[0041] (4) Concentrated sulfuric acid: purity 95-98%, Tianjin Bodi Chemical Co., Ltd.

[0042] (5) Concentrated phosphoric acid: purity ≥85%, Tianjin Bodi Chemical Co., Ltd.

[0043] (6) Hydrochloric acid: purity 36-38%, Tianjin Bodi Chemical Co., Ltd.

[0044] (7) Ammonia water: 25% purity, Sinopharm Chemical Reagent Co., Ltd.

[0045] (8) Cerium nitrate hexahydrate: Purity AR, Aladdin's reagent

[0046] (9) Ethanol: Purity AR, Sinopharm Chemical Reagent Co., Ltd.

[0047] The specific operation steps for preparing the composite microwave absorbing...

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Abstract

The present invention specifically relates to a microwave-absorbing material and a preparation method of reducing graphene oxide and nano-cerium oxide composite. The graphene oxide is prepared by the improved Hummers method, and the graphene oxide aqueous solution is mixed with cerium nitrate at a mass ratio of 1:25, and at the same time The pH is adjusted to 10, and a one-step hydrothermal method is used to reduce the graphene oxide while generating nano-cerium oxide, so as to obtain a composite microwave absorbing material of reduced graphene oxide and nano-cerium oxide. The microwave absorption parameters of the composite material are tested by a vector network analyzer, and the microwave reflection loss of the composite material is calculated by the classical coaxial line theory. The results show that the reduced graphene oxide / nano-cerium oxide composite microwave absorbing material has excellent microwave absorption performance, high absorption strength, and wide absorption frequency band. Compared with nano-cerium oxide, the microwave-absorbing performance is greatly improved. Therefore, the present invention has broad application prospects, and has extremely important significance for expanding the industrial application of rare earth oxides and national defense construction.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a microwave absorbing material and a preparation method. Background technique [0002] With the development of military stealth technology and civilian anti-electromagnetic interference technology, microwave absorbing materials (referred to as absorbing materials) have become a research hotspot, and this type of material has gradually become an important branch of applied functional materials. Absorbing materials refer to a class of materials that can absorb and attenuate incident electromagnetic waves, convert their electromagnetic energy into heat or other forms of energy and dissipate them, or make electromagnetic waves disappear due to interference. [0003] The main disadvantages of traditional absorbing materials, such as ferrite, graphite, and ceramics, are high density, narrow absorption frequency band, and insufficient absorption strength, so the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
Inventor 邢宏龙尹清刘振峰王磊
Owner ANHUI UNIV OF SCI & TECH
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