Method of synthesizing magnetite/maghemite core/shell nanoparticles
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United States of America Patent
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Nov 26, 2019
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May 9, 2019
app pub date -
Nov 9, 2017
filing date -
Nov 9, 2017
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Abstract
The method of synthesizing magnetite/maghemite core/shell nanoparticles is a modified co-precipitation method for producing iron oxide (Fe3O4/γ-Fe2O3) nanoparticles that allows for production of the Fe3O4/γ-Fe2O3 core/shell nanoparticles with a desired shell thickness ranging between about 1 nm to 5 nm for biomedical and data storage applications. Aqueous solutions of ferric and ferrous salts are mixed at room temperature and pH of the mixture is raised to 10. The mixture is then heated at 80° C. for different lengths of time at atmospheric pressure to adjust particle size, and the precipitate is dried at 120° C. in vacuum. Oxidation in an oxygen atmosphere for different lengths of time is used to adjust the thickness of the γ-Fe2O3 shell.
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