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Preparation method of ferroferric oxide nano sheet

A technology of ferric oxide and nanosheets, which is applied in the direction of iron oxide/hydroxide, nanotechnology, nanotechnology, etc., can solve the problems of low saturation magnetization, complex process, long growth cycle, etc., and achieve reliable production process, Reproducible and easy-to-operate effects

Active Publication Date: 2013-02-20
JIANGSU YONGKAI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this method is that it is easy to operate, but the disadvantage is that the product has a wide particle size distribution, takes a long time, consumes a lot of energy, and is easy to introduce impurities, etc.
Chemical synthesis methods mainly include co-precipitation method, pyrolysis method, high temperature hydrolysis method, microemulsion method, hydrothermal method, sonochemical method, etc. Although these methods are relatively simple, they generally have many steps, complex processes, and long growth cycles. , and the yield of obtained nanoparticles is not high, the saturation magnetization is low, and the superparamagnetic effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, a kind of preparation method of iron ferric oxide nanosheet, its steps are as follows:

[0018] (1) Add an appropriate amount of ethylene glycol into the reaction kettle and perform magnetic stirring; then FeCl with a weight ratio of 3.50:1:4.8 3 ·6H 2 O, FeCl 2 4H 2 O and surfactant are added in ethylene glycol, make it mix homogeneously; Described surfactant is selected from arbitrary in citric acid, polyvinylpyrrolidone PVP, polyethylenediamine PEI, sodium dodecylsulfonate SDS A sort of;

[0019] (2) Slowly add strong alkali into the mixed solution; after stirring the mixed solution for 2 hours, take out the stirring bar, then put the reaction kettle into the iron shell, close it and place it in a constant temperature oven at 180°C, and react for 12 hours; The strong base is selected from one of LiOH, NaOH or KOH; the strong base and FeCl 2 4H 2 The weight ratio of O is 20:1;

[0020] (3) After the reaction kettle is naturally cooled to room temp...

Embodiment 2

[0021] Embodiment 2, a kind of preparation method of iron ferric oxide nanosheet, its steps are as follows:

[0022] (1) Add an appropriate amount of ethylene glycol into the reaction kettle and carry out magnetic stirring; then FeCl with a weight ratio of 4.0:1:5.2 3 ·6H 2 O, FeCl 2 4H 2 O and surfactant are added in ethylene glycol, make it mix homogeneously; Described surfactant is selected from arbitrary in citric acid, polyvinylpyrrolidone PVP, polyethylenediamine PEI, sodium dodecylsulfonate SDS A mixture of 2 or 3 or all 4 kinds, the ratio is selected according to the needs;

[0023] (2) Slowly add strong alkali into the mixed solution; after the mixed solution is stirred for 12 hours, take out the stirring bar, then put the reaction kettle into the iron shell, close it and place it in a constant temperature oven at 200°C, and react for 48 hours; The strong base is a mixture of two or three of LiOH, NaOH or KOH, and the ratio is selected according to the needs; the ...

Embodiment 3

[0025] Embodiment 3, a kind of preparation method of ferric oxide nanosheet, its steps are as follows:

[0026] (1) Add an appropriate amount of ethylene glycol into the reaction kettle, and carry out magnetic stirring; then FeCl with a weight ratio of 3.71:1:5 3 ·6H 2 O, FeCl 2 4H 2 O and surfactant are added in ethylene glycol, make it mix homogeneously; Described surfactant is selected from arbitrary in citric acid, polyvinylpyrrolidone PVP, polyethylenediamine PEI, sodium dodecylsulfonate SDS A sort of;

[0027] (2) Slowly add strong alkali into the mixed solution; after stirring the mixed solution for 8 hours, take out the stirring bar, then put the reaction kettle into the iron shell, close it and place it in a constant temperature oven at 190°C, and react for 24 hours; The strong base is selected from one of LiOH, NaOH or KOH; the strong base and FeCl 2 4H 2 The weight ratio of O is 70:1;

[0028] (3) After the reaction kettle is naturally cooled to room temperat...

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Abstract

The invention relates to a preparation method of a ferroferric oxide nano sheet, which comprises the following steps: dissolving soluble iron ion salt in ethylene glycol, then adding surfactant and a strongly alkaline solution, performing solvothermal synthesis to obtain solid particles, repeatedly washing with distilled water and anhydrous alcohol, and drying at room temperature to obtain the ferroferric oxide nano sheet. The preparation method provided by the invention has the characteristics of simple process, good repetitiveness, high yield and high modification possibility. The nano sheet prepared by the method is ferroferric oxide, is a two-dimensional sheet in morphology, has an average size of 30-120 nanometers and is superparamagnetic.

Description

technical field [0001] The invention relates to a flaky, superparamagnetic nano particle, in particular to a preparation method of ferric iron tetroxide nano flakes. Background technique [0002] Magnetic Fe3O4 nanoparticles are widely used in stealth absorbing materials, magnetic recording materials, magnetic refrigeration materials, Magnetic memory materials, magnetic control sensors, microwave communication devices, maglev trains, liquid magnetic motors and magnetic resonance imaging technology and other fields. The study found that when the particle size reaches the nanometer level, the properties of the particle are not only affected by the particle size, but also closely related to the shape of the particle. For example, through the control of its structure and aspect ratio, the easy magnetization direction of ferroferric oxide nanowires can be easily adjusted, and its coercive force and remanence ratio can be improved, which helps to solve the problem of its recordi...

Claims

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Application Information

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IPC IPC(8): C01G49/08B82Y30/00
Inventor 蒋云翔董文飞江征平
Owner JIANGSU YONGKAI CHEM CO LTD
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