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A preparation method of magnetic nanocrystals with adjustable morphology

A magnetic nano, nano crystallite technology, applied in the field of nano materials, to achieve the effect of low raw material cost and mild process conditions

Inactive Publication Date: 2016-03-23
SOUTHWEST UNIV
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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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  • A preparation method of magnetic nanocrystals with adjustable morphology
  • A preparation method of magnetic nanocrystals with adjustable morphology
  • A 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 0.05 mol of CuO powder to boiling solution 1;

[0035] (4) Keep boiling for 30 minutes. Stop heating and cool to room temperature naturally. The precipitation process is over after two hours;

[0036] (5) Pour out the supernatant liquid after precipitation and wash it with acetone: take acetone 5 times the volume of the precipitate and mix with it, stir it thoroughly, and then perform centrifugal separation. Repeat this step three times;

[0037] (6) Transfer the cleaned sediment to a vacuum dryer. After 12 hours, the ferrihydrite precursor can be obtained.

[0038] 2. Preparation of Nano Crystals

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

[0040] (2) Pour the precursor prepared in the first step into sol...

Embodiment 2

[0046] 1. Precursor preparation

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

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

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

[0050] (4) Keep boiling for 30 minutes. Stop heating and cool to room temperature naturally. The precipitation process is over after two hours;

[0051] (5) Pour out the supernatant liquid after precipitation and wash it with acetone: take acetone 5 times the volume of the precipitate and mix with it, stir it thoroughly, and then perform centrifugal separation. Repeat this step three times;

[0052] (6) Transfer the cleaned sediment to a vacuum dryer. After 12 hours, the ferrihydrite precursor can be obtained.

[0053] 2. Preparation of Nano Crystals

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

[0055] (2) One (5) Same as Example 1.

[0056] Example 2 The synthesi...

Embodiment 3

[0058] 1. Precursor preparation

[0059] As in Example 1

[0060] 2. Preparation of Nano Crystals

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

[0062] (2) One (5) Same as Example 1.

[0063] Example 3 The synthesized nanocrystal morphology is as Figure 5 Shown. Its specific magnetization curve is as Image 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 nanomaterials, and specifically relates to a method for preparing magnetic nanocrystals. Background technique [0002] Nanocrystals are tiny crystal grains with at least one dimension of 1-100nm in geometry, and are a typical nanomaterial. Nanocrystallites can be divided into three categories according to their dimensions: (1) Zero-dimensional, which refers to crystallites that are consistent in three dimensions in space and are all on the nanometer scale, such as spherical nanocrystals; (2) One-dimensional, which refers to Two-dimensional crystallites that are at the nanometer scale and the other dimension is larger, such as nanocrystals such as wires, rods, rods, etc.; (3) Two-dimensional means that one dimension is at the nanometer scale in the three-dimensional space, and the other two dimensions are larger The microcrystals, such as flake nanocrystals. Nanocrystals have different chemical and physical properties ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06B82Y30/00
Inventor 李建龚小敏
Owner SOUTHWEST UNIV