Method for synthesizing ferrimagnetism hollow microballoons

Abstract

The invention belongs to the preparation field of magnetic materials, comprising the following steps: firstly, adding the metal ion salt to organic polar solvent for complete dissolution, and then adding solid alkali metal salt and surfactant; the composed mixed solution is reacted at 140-200 DEG C so as to get ferrimagnetic hollow microspheres; the mass ratio between the surfactant and the organic polar solvent is 0.02-0.2:1; the concentration of the metal ion solution is 0.025-0.625mol / L; the molar ratio between the alkali metal salt and the metal ions is 5-20:1; the metal ion is selected from one or more among the iron, cobalt, nickel, manganese, zinc and magnesium ions; the surfactant can be polyethylene glycol series or tween series; the organic polar solvent can be glycol, ethanol, diethylene glycol, triethylene glycol, tetraethylene glycol or glycerol. The method of the invention is simple and the raw materials are cheap and can be easily obtained; the method has good process repeatability, high yield, safety, low cost and wide applicability, which generates no toxic substances and pollutants.

Description

technical field [0001] The invention relates to a synthesis method of a series of ferrite magnetic hollow microspheres, which belongs to the field of preparation of magnetic materials. Background technique [0002] Hollow spherical nanostructure materials have the characteristics of low density, high surface area, and molecules can pass through spherical shells with polycrystalline microstructures, and can be used as catalysts, low-density structural materials, chemical sensors, substances (drugs, cosmetics, and dyes, etc.), nano-scale or micro-scale reactors and electrode materials, etc. Therefore, this type of material has been widely concerned by material researchers in recent years, and it is a hot field of nanomaterials research today. . Generally speaking, there are two ways to synthesize such hollow sphere nanostructure materials. One approach is based on the use of various removable templates to prepare hollow sphere-structured materials, such templates include har...

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Problems solved by technology

A research group of Nanjing University (Advance Materials, volume 16, page 933, 2004.) reported that by Fe 3 o 4 Self-assembly of nanoparticles and polymers is a method for synthesizing hollow magnetic nanoparticles, but this method has many steps and involves pyrolysis to remove polymers, which is not conducive to mass production

A research group of Jilin University (Journal of the American Chemical Society, 128 volumes, 8382 pages, 2006.) reported the method for preparing amphiphilic superparamagnetic submicron inorganic matter / polymer composite hollow spheres by solvothermal method. Although the method is simple, But the price of the triblock polymer PEO-PPO-PEO used is higher

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