Method for preparing nanometer ferroferric oxide microballoons with particle diameter adjustable by microwave

Abstract

A method for preparing nano ferroferric oxide spheres with adjustable particle size with micro wave belongs to the nano material preparation technical field. The method comprises the following steps: the first step, adding inorganic salt and a surface active agent after malysite dissolves in polylol, adding a latent solvent; mixing and stirring to obtain a precursor liquid of ferroferric oxide, wherein, the mass ratio of the polylol and the malysite is (5-100):1, the mass ratio of the inorganic salt and the malysite is (1-6): 1, the mass ratio of the surface active agent and the malysite is (0-5):1, and the volume ratio of the latent solvent and the polymol is (0-1):1; the second step, placing the precursor liquid of the ferroferric oxide in a glass tube used by microwave; conducting microwave heating reaction in a microwave reactor; and obtaining magnetic ferroferric oxide particles after the reaction. The method is simple and quick; the prepared magnetic ferroferric oxide particles have the advantages of strong magnetism, adjustable size and good dispersibility, as well as dispersion in water or organic solvent, and suitability for application in the biomedicine field or the mechanical electronic field.

Description

technical field [0001] The invention relates to a preparation method in the field of nanometer technology, in particular to a method for preparing nano ferric oxide microspheres with adjustable particle size by using microwaves. Background technique [0002] Ferric oxide (Fe 3 0 4 ) material is a ferromagnetic compound, when Fe 3 o 4 When the particle size is less than 30 nm, Fe 3 o 4 The particles have superparamagnetism, that is, the particles are magnetic under the external magnetic field, and the particles are non-magnetic and quickly disperse when the external magnetic field is removed. Therefore, using magnetic microspheres as carriers, Fe 3 o 4 The superparamagnetic properties of nanoparticles can be applied to biomedical applications such as the separation of cells, proteins, nucleic acids, and immunodiagnostic kits, as well as drug targeting carriers. There are many ways to prepare nano-ferric oxide, which are generally divided into wet method and dry method...

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Problems solved by technology

[0003] After searching the literature of the prior art, it was found that the Chinese patent CN1260136C "Manufacturing method of nanometer iron tetroxide" discloses a preparation method using radiation chemistry. The electron beam generated by the electron accelerator is used to irradiate the alkaline iron ion solution. According to the treatment to obtain ferric oxide, this method needs an accelerator and is not easy to popularize; microwave synthesis of nanomaterials has gradually gained popularity in the field of synthesis and preparation of nanomaterials because of its advantages such as short time consumption, low energy consumption, and controllable pressure and temperature. application

It was also found in the retrieval process that the Chinese patent CN100381363C "The temperature-controlled and pressure-controlled microwave synthesis method of water-soluble ferric oxide nanocrystals" discloses a method of using water as a solvent, iron salts and ferrous salts as raw materials, in alkaline solution In the method, a microwave reactor is used to prepare ferroferric oxide nanocrystals by controlling temperature and pressure. In the preparation process, the ratio of ferric salt and ferrous salt and the pH value of the solution must be strictly controlled in order to prepare ferric trioxide with good magnetic properties. Iron nanoparticles, and the prepared iron ferric oxide nanoparticles are only dispersed in aqueous solution. The application fields of magnetic nanoparticles are different and require different dispersion media. Therefore, they are limited in application.

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