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Method for synthesizing superparamagnetic ferroferric oxide nano-sheets

A ferric tetroxide, superparamagnetic technology, applied in the direction of iron oxide/iron hydroxide, nanotechnology, ferrous oxide, etc., can solve the problems of complex process, harsh reaction requirements, large size, etc. Simple conditions, easy to operate, simple to operate effects

Inactive Publication Date: 2015-02-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The products obtained by these methods have large size, poor dispersibility and harsh reaction requirements, and the process is more complicated

Method used

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  • Method for synthesizing superparamagnetic ferroferric oxide nano-sheets
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  • Method for synthesizing superparamagnetic ferroferric oxide nano-sheets

Examples

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Embodiment 1

[0019] A method for synthesizing superparamagnetic ferric oxide nanosheets, the steps are as follows:

[0020] (1) At room temperature, add trivalent soluble iron salt (ferric chloride) and divalent soluble iron salt (ferrous sulfate) to a certain amount of hydrochloric acid, then add a certain amount of water to prepare a mixed solution of a certain concentration, The mixed solution requires magnetic stirring for several hours to form a uniform mixed solution, wherein the molar ratio of trivalent soluble iron salt to divalent soluble iron salt is 5:1, and the molar ratio of trivalent soluble iron salt to divalent soluble iron salt to hydrochloric acid 4:2:1, and the molar ratio of hydrochloric acid to water is 1:140.

[0021] (2) the mixed solution that step (1) obtains is added dropwise in the 0.5mol / L NaOH solution that contains a certain amount of oleic acid under the vigorous stirring of magnetic stirrer, and the mol ratio of oleic acid and sodium hydroxide is 1: 20, The...

Embodiment 2

[0026] A method for synthesizing superparamagnetic ferric oxide nanosheets, the steps are as follows:

[0027] (1) At room temperature, add trivalent soluble iron salt (ferric sulfate) and divalent soluble iron salt (ferrous sulfate) to a certain amount of hydrochloric acid, and then add a certain amount of water to prepare a mixed solution with a certain concentration. The mixed solution requires magnetic stirring for several hours to form a uniform mixed solution, wherein the molar ratio of trivalent soluble iron salt to divalent soluble iron salt is 3:2, and the molar ratio of trivalent soluble iron salt, divalent soluble iron salt and hydrochloric acid is 8:4:3, the molar ratio of hydrochloric acid to water is 1:120.

[0028] (2) the mixed solution that step (1) obtains is added dropwise in the 2.0mol / L NaOH solution that contains a certain amount of oleic acid under the vigorous stirring of magnetic stirrer, and the mol ratio of oleic acid and sodium hydroxide is 1: 50, ...

Embodiment 3

[0030] A method for synthesizing superparamagnetic ferric oxide nanosheets, the steps are as follows:

[0031] (1) At room temperature, add trivalent soluble iron salt (ferric thiocyanate) and divalent soluble iron salt (ferrous sulfate) to a certain amount of hydrochloric acid, and then add a certain amount of water to prepare a mixed solution of a certain concentration , the mixed solution requires magnetic stirring for several hours to form a uniform mixed solution, wherein the molar ratio of trivalent soluble iron salt to divalent soluble iron salt is 3:1, and the molar ratio of trivalent soluble iron salt, divalent soluble iron salt and hydrochloric acid The ratio is 8:4:2.5, and the molar ratio of hydrochloric acid to water is 1:130.

[0032] (2) the mixed solution that step (1) is obtained is added dropwise in the 1.5mol / L NaOH solution that contains a certain amount of oleic acid under the vigorous stirring of magnetic stirrer, and the mol ratio of oleic acid and sodiu...

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Abstract

The present invention relates to a method for synthesizing superparamagnetic ferroferric oxide nano-sheets. The method comprises: adding a trivalent soluble iron salt and a divalent soluble iron salt to hydrochloric acid to form a uniform mixed solution, adding the mixed solution to a NaOH solution in a dropwise manner under vigorous stirring, carrying out magnetic attraction on the precipitate after completely reacting, washing a plurality of times with deionized water and ethanol, and carrying out vacuum drying at a temperature of 50-90 DEG C to obtain the superparamagnetic ferroferric oxide nano-sheets. Compared with the method in the prior art, the method of the present invention has characteristics of simple operation, no requirement of inert gas protection, performing at the room temperature, simple reaction conditions and easy operation. The superparamagnetic ferroferric oxide nano-sheets prepared by adopting the reversed-phase co-precipitation method have the small particle, the diameter of 10-30 nm, the saturation magnetization of 77.8 emu / g, and the residual magnetism of 0, and have the superparamagnetism so as to be easily used in the field of biomedicine and bioengineering.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, and in particular relates to a method for synthesizing superparamagnetic ferric iron tetroxide nanosheets under a non-inert atmosphere. Background technique [0002] Nano Fe 3 o 4 It has compatibility with biological tissue and electrical and magnetic properties related to size and shape, making it widely used in magnetic ink, electronic and biological sensitive materials, magnetic fluid and magnetic recording materials, high-density magnetic recording media and biomedicine, etc. field has a wide range of applications. Therefore, it has become one of the hotspots of the majority of scientific research workers. Since superparamagnetic ferric oxide nanomaterials have broader application prospects in the fields of biomedicine, immunity, and environmental science, the preparation of superparamagnetic nanomaterials has also become one of the focuses of everyone's research. ...

Claims

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Application Information

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IPC IPC(8): C01G49/08B82Y40/00
Inventor 陈云吴庆生夏一鸣李静
Owner TONGJI UNIV
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