Carbonized bacterial cellulose/magnetic composite wave-absorbing material and preparation method thereof

Abstract

The invention discloses a carbonized bacterial cellulose / magnetic composite wave-absorbing material. The carbonized bacterial cellulose / magnetic composite wave-absorbing material is characterized in that: the material is formed by compounding carbonized bacterial cellulose and a nano-magnetic material, the volume ratio of the carbonized bacterial cellulose to the nano-magnetic material is between 1:20 and 5:1, and the nano-magnetic material is one of ferrite or magnetic metal and alloy thereof. The carbonized bacterial cellulose and the nano-magnetic material are compounded, and an obtained biomass mesh-shaped nano-carbon fiber / magnetic composite material can be taken as an ideal microwave absorbent; the wave-absorbing material has the characteristics of thinness, lightness, width and strongness; the carbonized bacterial cellulose / magnetic composite wave-absorbing material has the advantages of low cost, simple preparation technology, environment-friendliness and the like; and the composite wave-absorbing material has broad application prospect in the field of electromagnetic pollution prevention, radar stealth and the like.

Description

A kind of carbonized bacterial cellulose / magnetic composite wave absorbing material and preparation method thereof technical field The invention belongs to a microwave absorbing material and a preparation method thereof, and relates to a carbonized bacterial cellulose / magnetic composite wave absorbing material and a preparation method thereof. The prepared composite wave absorbing material is suitable for fields such as anti-electromagnetic pollution and radar stealth, and can be directly applied to microwave absorbing agents. Background technique Microwave absorbing materials have been regarded by countries all over the world as new materials for military and civilian use. Especially with the development of radar detection technology, the original microwave absorbing materials are facing great challenges. A new type of absorbing material with wide frequency band, good physical and mechanical properties, and meeting the requirements of multi-spectrum, high temperature resi...

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Problems solved by technology

The main disadvantages of ferrite wave absorbers are high density and poor temperature stability, but they have good frequency characteristics, large relative magnetic permeability, and small relative permittivity, so they are suitable for making matching layers

Nano-carbon and ferromagnetic materials have obvious advantages in absorbing waves, but there are two serious problems in practical applications. One is that due to the high aspect ratio and large surface area of ​​carbon nanotubes or nano-carbon fibers, they are It is quite difficult to uniformly disperse in the matrix; the second is that the cost of preparing these carbon nanomaterials is relatively high and the output is low

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