Flexible ferroferric oxide fibers and preparation method thereof

Abstract

The invention relates to flexible ferroferric oxide fibers and a preparation method thereof. The diameter of the ferroferric oxide fibers is about 0.5-1.5 mu m, and the ferroferric oxide fibers consist of ferroferric oxide nanocrystalline grains. The preparation method comprises the following steps: fully stirring newly prepared ferric hydroxide and an acid source in water until the newly preparedferric hydroxide and the acid source are completely dissolved, and distilling under reduced pressure until a viscous sol is formed; adding a spinning aid, and adjusting to a certain viscosity to obtain a precursor spinning solution; obtaining precursor fibers through electrostatic spinning, and preparing the ferroferric oxide fibers through pretreatment in an air atmosphere and high-temperature heat treatment in an oxygen-free environment without a reduction step. The problem of poor flexibility of fibers prepared by directly dissolving iron salt in high polymer to form a spinning solution and then carrying out electrostatic spinning is solved, furthermore, the problems of uneven mixing of ferroferric oxide nanoparticles in the spinning solution and low saturation magnetization caused bylimited mixing amount of the ferroferric oxide nanoparticles in a blending spinning method are solved. The fibers are excellent in flexibility, high in saturation magnetic susceptibility and easy to separate by an external magnetic field.

Description

technical field [0001] The invention belongs to the technical field of synthetic fibers, and in particular relates to a flexible triiron tetroxide fiber and a preparation method thereof. Background technique [0002] nanometer ferric oxide (Fe 3 o 4 ) is the most widely used magnetic material because of its simple preparation, wide source of iron element, high saturation magnetization at room temperature, non-toxic and harmless, and biocompatibility. It has great application value in magnetic devices, magnetic storage, magnetic fluid, cell separation, protein purification, drug loading and release, etc. Because the separation of solid and liquid phases under the action of an external magnetic field is very simple, and the specific surface area is large, it is also widely used in water treatment. The Fe3O4 fiber not only has the above-mentioned advantages of the Fe3O4 nanoparticles, but also overcomes its shortcoming of being easy to agglomerate. [0003] Mou Fangzhi and ...

AI Technical Summary

Problems solved by technology

The preparation of spinning solution by this method not only overcomes the problem of poor flexibility of fibers prepared by directly dissolving iron salt in high polymer to form spinning solution; Low saturation magnetization due to uneven mixing and limited dosing of Fe3O4 nanoparticles

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