Preparation method of magnetic Fe2O3/Fe3O4 nano-heteroplasmon particles

Abstract

The invention belongs to the technical field of preparation of inorganic nonmetal nanocomposite materials, and concretely relates to a preparation method of magnetic Fe2O3 / Fe3O4 nano-heteroplasmon particles. The method adopts metal iron salt, alcohol and an alcohol-soluble organic matter as raw materials, and comprises the following steps: adding the iron salt to alcohol or the alcohol-soluble organic matter according to a ratio of the iron salt to the alcohol of 1mol / 7mL or less, stirring for dissolving to prepare a sol solution, igniting and combusting the sol solution in air to prepare a gel, calcining the gel at 150-450DEG C under a heating rate of 0.5-15DEG C / min for 0.1-12h, and naturally cooling to prepare the magnetic Fe2O3 / Fe3O4 nano-heteroplasmon particles. The preparation method has the advantages of simple technology, convenient operation, easy process control, wide sources of the raw materials, low cost, environmental protection, low requirements on a required device, uniform diameter distribution of the particles, and convenience for large-scale industrial production. The microstructure and the morphology of the particles can be conveniently controlled by adjusting process factors and the chemical composition in order to control the performances of the particles.

Description

technical field [0001] The invention relates to a magnetic Fe 2 o 3 / Fe 3 o 4 The invention discloses a method for preparing nano-heterogeneous particles, which belongs to the technical field of preparing inorganic non-metallic nano-composite materials. Background technique [0002] As an environmentally friendly magnetic nanomaterial, iron oxide nanomaterials have many unique physical and chemical properties and can exist stably under environmental conditions. These unique properties make them widely used in electrode materials, catalysts, sensors, magnetic resonance imaging and many other fields. Due to its low cost, environmental protection, good biocompatibility, and non-toxic or low-toxic properties in organisms, iron oxide nanomaterials have also been widely used in the field of biomedicine, such as for genes and drugs Delivery vectors, cell isolation, DNA extraction, hyperthermia and more. [0003] The morphology of magnetic iron oxide nanomaterials mainly inclu...

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Problems solved by technology

As reported in the literature (J. Magn. Magn. Mater., 2004, 272-276: 1776-1777), the α-Fe2O3 in 95% argon and 5% hydrogen atmosphere at 350°C for 0.5-6 h, and then calcined at 1100°C for 3 h under the protection of helium to obtain magnetic Fe2O3 / Fe3O4 nano-heterogeneous particles, the preparation process is complicated, the process control is difficult, and hydrogen reduction is used, the operation control is relatively strict, the requirements are high, and the requirements for equipment are high , the gas cannot be leaked, and improper operation will bring safety hazards; at the same time, the use of rare gas protection will pollute the environment and the preparation cost is high; literature (Mater. Lett., 2015, 138: 164-166) prepared Fe by hydrothermal method 3O4 nanoparticles were aged in FeCl3 dissolved in PVP and urea at 90°C for 24 hours to prepare Fe 2O3 / Fe3O4Nano heterogeneous particles

Although this process is not dangerous, it has gone through a cumbersome preparation process and complicated control process, and the production cycle is long, and the Fe2O3 / Fe3O4 nano-heterogeneous particles exceed 100 nm, which severely limits the application research of particles in biomedicine

[0005] Aiming at the deficiencies of the traditional preparation process, the present invention adopts the method combining sol combustion-gel calcination to prepare magnetic Fe2O3 / Fe3O4 nano-heterogeneous particles make up for the shortcomings of the existing preparation technology, such as cumbersome preparation technology and difficult control, and provide a It can effectively reduce and avoid potential safety hazards, simplify the preparation process, shorten the preparation cycle, increase its yield per unit time, and enable large-scale production of magnetic Fe2O3 / Fe3O4 nano-heterogeneous particles, and the prepared magnetic Fe2O3 / Fe3O4 nano-heterogeneous particles have a small particle size, which is convenient for application research in biomedicine

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