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Preparation method of magnetic nanocrystals with adjustable morphology

A magnetic nanometer and nanocrystal technology, applied in the field of nanomaterials, achieves the effect of low cost of raw materials and mild process conditions

Inactive Publication Date: 2013-12-25
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the method of preparing ferromagnetic nanocrystals from ferrihydrite as a precursor

Method used

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  • Preparation method of magnetic nanocrystals with adjustable morphology
  • Preparation method of magnetic nanocrystals with adjustable morphology
  • Preparation method of magnetic nanocrystals with adjustable morphology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Precursor preparation

[0032] (1) Configure Fe(NO 3 ) 3 Aqueous solution (0.25M, 400mL), namely solution 1.

[0033] (2) Heat solution 1 to boiling under stirring;

[0034] (3) Add 0.05mol of CuO powder to the boiling solution 1;

[0035] (4) Keep boiling for 30 minutes. Stop heating and cool to room temperature naturally. After two hours, the precipitation process ended;

[0036] (5) Pour off the supernatant after the precipitation, and wash it with acetone: take acetone 5 times the volume of the precipitate and mix it with it, stir well and then perform centrifugation. This step is repeated three times;

[0037] (6) Transfer the washed precipitate into a vacuum desiccator. After 12 hours, the ferrihydrite precursor can be obtained.

[0038] 2. Preparation of nanocrystals

[0039] (1) Configure FeCl 2 Aqueous solution (0.75M, 80mL), i.e. solution 2; NaOH aqueous solution (0.2M, 500mL), i.e. solution 3;

[0040] (2) Pour the precursor prepared in the fir...

Embodiment 2

[0046] 1. Precursor preparation

[0047] (1) Configure Fe(NO 3 ) 3 Aqueous solution (0.25M, 400mL), i.e. solution 1;

[0048] (2) Heat solution 1 to boiling under stirring;

[0049] (3) Add 0.05mol of CuO powder to the boiling solution 1;

[0050] (4) Keep boiling for 30 minutes. Stop heating and cool to room temperature naturally. After two hours, the precipitation process ended;

[0051] (5) Pour off the supernatant after the precipitation, and wash it with acetone: take acetone 5 times the volume of the precipitate and mix it with it, stir well and then perform centrifugation. This step is repeated three times;

[0052] (6) Transfer the washed precipitate into a vacuum desiccator. After 12 hours, the ferrihydrite precursor can be obtained.

[0053] 2. Preparation of nanocrystals

[0054] (1) Configure FeCl 2 Aqueous solution (3M, 80mL), i.e. solution 2; NaOH aqueous solution (0.2M, 500mL), i.e. solution 3;

[0055] (2)-(5) is the same as embodiment 1.

[0056] ...

Embodiment 3

[0058] 1. Precursor preparation

[0059] as example 1

[0060] 2. Preparation of nanocrystals

[0061] (1) Configure FeCl 2 Aqueous solution (0.75M, 80mL), i.e. solution 2; NaOH aqueous solution (0.3M, 500mL), i.e. solution 3;

[0062](2)-(5) is the same as embodiment 1.

[0063] The nano crystallite form of embodiment 3 synthesis is as Figure 5 shown. Its specific magnetization curve is as Figure 6 shown;

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Abstract

The invention discloses a preparation method of magnetic nanocrystals with adjustable morphology. The preparation method comprises following steps: step 1, preparation of ferrihydrite precursors, wherein hydrolysis reaction is promoted by adding CuO into a Fe(NO3)3 solution so as to obtain the ferrihydrite (Fe5O7OH.4H2O) precursors; and step 2, preparation of the magnetic nanocrystals, wherein a mixture of the ferrihydrite precursors, a FeCl2 solution and a NaOH solution is subjected to heating processing so as to obtain the maghemite (gamma-Fe2O3) nanocrystals. Technological conditions of the preparation method is mild, raw material cost is low, and it is possible to obtain ball-shaped, rod-shaped or sheet-shaped magnetic nanocrystals by controlling the synthesis conditions.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a preparation method of magnetic nanocrystals. Background technique [0002] Nano crystallite is a tiny crystal grain with at least one dimension in the range of 1-100nm, which is a typical nanomaterial. Nanocrystallites can be divided into three categories according to the dimensionality: (1) zero-dimensional, which refers to crystallites with the same three-dimensional scale in space and all in nanoscale, such as spherical nanocrystallites; (2) one-dimensional, which refers to crystallites with Microcrystals with two dimensions at the nanoscale and the other dimension is larger, such as nanocrystals such as silk, rods, and rods; (3) two-dimensional, which means that in three-dimensional space, one dimension is at the nanoscale and the other two dimensions are larger crystallites, such as sheet-like nanocrystallites. Nanocrystals have chemical and physical proper...

Claims

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Application Information

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IPC IPC(8): C01G49/06B82Y30/00
Inventor 李建龚小敏
Owner SOUTHWEST UNIVERSITY
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