Preparation method and application of hollow core-shell structure Co@SiO2@PPy

By preparing the hollow core-shell structure Co@SiO2@PPy, the problems of high density and poor corrosion resistance of magnetic materials in the existing technology are solved, lightweight and efficient electromagnetic wave absorption performance is achieved, and the influence of high-temperature calcination on magnetic loss is avoided.

CN117548684BActive Publication Date: 2025-09-23HARBIN ENG UNIV
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Patent Information

Application Number
CN202311514141.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-14
Publication Date
2025-09-23
Estimated Expiration
2043-11-14

AI Technical Summary

Technical Problem

Existing magnetic metal materials have problems such as high density and poor corrosion resistance. The high-temperature calcination process increases energy consumption and affects magnetic loss. The introduction of dielectric materials may have an adverse effect on the performance of magnetic materials.

Method used

Monodisperse hollow Co microspheres were prepared by a solvothermal method, the surface was coated with SiO2 and PPy was in situ polymerized to form a hollow core-shell structure Co@SiO2@PPy, avoiding high-temperature calcination. The magnetic loss of Co and the high electrical conductivity of PPy were combined to enhance the electromagnetic wave absorption performance.

Benefits of technology

The lightweight electromagnetic wave absorption performance is improved. The SiO2 layer enhances the interface polarization and prevents corrosion. PPy provides high conductivity loss, solving the problems of high density and poor corrosion resistance in the existing technology, and achieving excellent electromagnetic wave absorption effect.

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Abstract

A preparation method and application of a hollow core-shell structured Co@SiO2@PPy, belonging to the technical field of electromagnetic wave absorbing materials. The present invention first prepares monodisperse hollow Co microspheres by a solvothermal method. The hollow structure reduces the weight of Co without sacrificing its magnetic loss performance. SiO2 is then coated on the surface of the Co microspheres by a modified Stober method. The introduction of the SiO2 layer not only enhances the interfacial polarization of the composite material but also prevents the Co core from being corroded by acidic solutions and has no significant negative impact on the magnetic loss capacity of Co. Finally, PPy is coated on the surface of the SiO2 layer by in-situ polymerization. PPy has strong electrical conductivity loss due to its high electrical conductivity, and high dielectric loss can be obtained without high-temperature calcination. A hollow core-shell structured Co@SiO2@PPy is used as an electromagnetic wave absorbing material.
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Citation Information

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