A kind of preparation method of porous graphene/ferric oxide composite absorbing material
A technology of composite wave-absorbing material and porous graphene, which is applied in the field of invention, can solve problems such as cumbersome preparation process, and achieve the effects of simple process, excellent performance and convenient operation
Inactive Publication Date: 2019-03-12
QINGDAO UNIV
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Problems solved by technology
At present, it is common to mix graphene oxide with magnetic materials and then reduce graphene to form a three-dimensional structure. The preparation process is cumbersome. Therefore, a method for compounding porous graphene and magnetic materials prepared by one-step method is sought, and finally a wave-absorbing material with excellent performance is obtained. Material
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Embodiment
[0016] In this embodiment, ferric iron tetroxide is selected as the magnetic material to be combined with porous graphene, and the specific preparation process is as follows:
[0017] (1) Weigh 2g of sodium and 5ml of ethanol in a 50ml reaction kettle, heat the reaction at 220°C for 48h, and gradually cool the product to room temperature after the reaction to obtain a white precursor product. The precursor product is pyrolyzed with deionized water, the white precursor product turns black, then the product obtained is washed 3 times with deionized water, and finally freeze-dried to obtain dry porous graphene;
[0018] (2) Put 180 mg of the porous graphene prepared in step (1) in a 250 ml three-necked flask, add 120 ml of deionized water, then heat it to 50° C. in an oil bath, and feed in nitrogen while stirring vigorously to remove the solution The whole process of the reaction kept vigorous stirring, 50°C reaction conditions and nitrogen atmosphere; then added 70.77mg of ferri...
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Abstract
The invention belongs to the technical field of functional composites and relates to a preparation method of a porous graphene / ferroferric oxide composite absorbing material. The preparation method includes: placing sodium and ethanol into a reaction kettle for reaction, subjecting a white product to pyrolyzation with deionized water after reaction, and cleaning the product obtained from pyrolyzation reaction with the deionized water prior to freezing and drying to obtain the porous graphene; adding the porous graphene to a 3-neck boiling flask added with the deionized water, heating and keeping at the temperature of 50DEG C, feeding nitrogen to stir to add ferric chloride and ferrous chloride to the solution prior to stirring for dispersion, adding ammonia hydroxide after dispersion and stirring for reaction to obtain black magnetic composite material, cleaning with the deionized water, freezing and drying the product to obtain the porous graphene / ferroferric oxide composite absorbing material. The preparation method is simple in process, convenient in operation, easy to obtain the materials, low in cost, clean and non-toxic, high in yield, short in time, good in performance and wide in application value.
Description
Technical field: [0001] The invention belongs to the technical field of preparation of functional composite materials, and relates to a method for preparing a composite material with excellent wave-absorbing properties, in particular to a porous graphene / iron tetroxide composite wave-absorbing composite composed of porous graphene and magnetic materials The preparation method of the material, the prepared composite absorbing material combines the advantages of the dielectric loss, high specific surface area, and light weight of porous graphene with the dielectric and magnetic loss properties of the magnetic substance, and at the same time, it is between the two substances A large number of interfaces are formed, and finally the incident electromagnetic waves are effectively absorbed to achieve the purpose of electromagnetic shielding and combat stealth. Background technique: [0002] At present, with the rapid development of science and electronic technology, electromagnetic...
Claims
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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 刘敬权王晓霞郑艺伟
Owner QINGDAO UNIV