Biological method for preparing ferrite-bismuth ferrite composite fluorescent material

Abstract

The present invention relates to a biological method for preparing a ferrite-bismuth ferrite composite fluorescent material. The biological method comprises three steps of: step I: in a tryptone soy broth culture medium, respectively culturing 30 g / L shewanella putrefaciens MR-1 and 30 g / L iron-reducing bacteria CN-32; step II: using a peptization reflow technique to prepare transition metal single-doped iron oxide hydroxide; and step III: under an aerobic condition at the room temperature, adding the single-doped iron oxide hydroxide and bismuth ferrite respectively into the shewanella putrefaciens MR-1 and the iron reduction bacteria CN-32, standing and layering to obtain the ferrite-bismuth ferrite nano composite fluorescent material respectively prepared from the shewanella putrefaciens MR-1 and the iron-reducing bacteria CN-32. Compared with the current conditions, the biological method for preparing the ferrite-bismuth ferrite composite fluorescent material has the advantages of a low price, a simple process, less pollution, and a high recovery rate. The ferrite-bismuth ferrite composite fluorescent material powder obtained by the method is high in purity, complete in topography, and uniform in thickness, has good fluorescent properties and can be applied to the fields of magnetic resonance imaging, targeting drug delivery, magnetic hyperthermia, and the like.

Description

technical field [0001] The invention relates to a biological method for preparing a ferrite-bismuth ferrite composite fluorescent material, which belongs to the field of biological materials. Background technique [0002] At present, the combination of magnetic and luminescent materials has become a hot topic in cell labeling research, and nanocomposite fluorescent materials have potential applications in biological application devices, such as drug delivery, MIR and fluorescence imaging, and therapeutic aspects. Nanocomposite fluorescent materials have many excellent application prospects in the medical field because they have both the photoelectric effects of fluorescent materials and the manipulability of magnetic materials: (1) through the use of magnetic resonance imaging to identify malignant tissues during surgery and high-resolution imaging Fluorescence imaging; (2) Appropriate nanocomposite fluorescent material particle surface can provide anti-aggregation stability...

AI Technical Summary

Problems solved by technology

[0003] Ferroferric oxide is widely used in the synthesis of bifunctional nanocomposites because of its simple preparation method, low cost, and strong magnetism, but a single nanoparticle of ferroferric oxide is prone to fluorescence quenching

However, in the preparation process of nanocomposite fluorescent materials, traditional physical or chemical methods are difficult to avoid the surface defects of inorganic materials caused by high temperature annealing, which reduces the optical and magnetic properties.

In addition, the coating of p-type bismuth ferrite core with n-type ferroferric oxide outer shell is easy to cause the transformation of the effective electron transfer direction in the heterojunction, and reduce the magnetic properties of the nano-coating body and the rate of capturing effective electrons and holes on the particle surface.

Images