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Method for synthesizing alpha-Fe2O3 nano-particle with controllable shape size

A nanoparticle and size technology, applied in the field of α-Fe2O3 preparation, can solve the problems of high cost, narrow size distribution, complex process, etc., and achieve the effects of low cost, good dispersibility and simple process

Inactive Publication Date: 2008-12-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Co-precipitation process is very simple, but it cannot effectively control α-Fe 2 o 3 The shape and size of nanoparticles, with a wide size distribution
Although the pyrolysis method can well control the α-Fe 2 o 3 The shape and size of nanoparticles, but it requires organic metals as raw materials, the cost is relatively high, and it requires inert gas protection and high temperature conditions, the process is more complicated
α-Fe prepared by microemulsion method 2 o 3 The nanoparticle size distribution is narrow and the dispersion is good, but this method requires a large amount of organic solvent, the yield is low, and it is difficult to realize industrial production

Method used

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  • Method for synthesizing alpha-Fe2O3 nano-particle with controllable shape size
  • Method for synthesizing alpha-Fe2O3 nano-particle with controllable shape size
  • Method for synthesizing alpha-Fe2O3 nano-particle with controllable shape size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 0.541g FeCl respectively 3 ·6H 2 O, 0.5852g lysine, dissolves with 100ml deionized water, forms clarification solution through magnetic stirring, then transfers in the reactor, seals. The reaction kettle was placed in an oven at 120°C for 1 day, and then naturally cooled to room temperature. The product was centrifuged, washed twice with water and once with ethanol, and dried in an oven at 50°C for 6 hours to finally obtain the product.

[0019] figure 1 (a) α-Fe prepared for this example 2 o 3 Nanoparticle XRD spectrum, its characteristic peaks are related to α-Fe 2 o 3 The standard peaks are consistent. figure 2 (a) is the α-Fe prepared by the present embodiment 2 o 3 TEM images of nanoparticles. It can be seen that α-Fe 2 o 3 The nanoparticles have a rhombohedral structure with a very uniform size and a side length of about 65nm.

Embodiment 2

[0021] Weigh 0.541g FeCl respectively 3 ·6H 2 0.0.1322g asparagine, other conditions are with embodiment 1, and the XRD spectrum of gained product is as figure 1 Shown in (b), its characteristic peak is consistent with embodiment 1. figure 2 (b) and image 3 (c) is the α-Fe prepared by the present embodiment 2 o 3 TEM images of nanoparticles. It can be seen from the figure that α-Fe 2 o 3 It is leaf-shaped, with a narrow size distribution, the long axis is about 150nm, and the short axis is about 90nm.

Embodiment 3

[0023] Weigh 0.541g FeCl respectively 3 ·6H 2 0.0.2984g methionine, other conditions are with embodiment 1, and the TEM figure of gained product is as follows figure 2 As shown in (c), α-Fe 2 o 3 The nanoparticles have a cube-like structure with an aspect ratio of about 1, uniform size, and a side length of 80 nm.

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Abstract

The present invention relates to a method for preparing an [alpha]-Fe2O3 nanoparticles with a controllable shape and size. The present invention adopts a hydrothermal method to synthesize the [alpha]-Fe2O3 nanoparticles in one step under the structural guide of amino acid. The trivalent ferric salt and the amino acid are dissolved in 100ml water according to different mol ratios and magnetically stirred to give a defecated clear solution. The defecated clear solution is poured into a reaction kettle of 150 ml, sealed heated to temperature of between 100 and 180 DEG C, kept at the temperature for 24 hours, cooled to room temperature, and then is subject to water cleaning, ethanol cleaning and drying, and thus the product is obtained. The shapes of the [alpha]-Fe2O3 nanoparticles can be controlled by applying different amino acids, and the sizes can be adjusted by changing the reaction conditions. The method is simple in process, well dispersible in water phase, low in cost, free of pollution and suitable for industrialized production.

Description

technical field [0001] The present invention relates to α-Fe 2 o 3 Preparation method, in particular to preparation of α-Fe by hydrothermal method 2 o 3 The nanoparticle method is to use amino acid as a structure-directing agent to prepare α-Fe with controllable shape and size. 2 o 3 nanoparticles. Background technique [0002] α-Fe 2 o 3 Nanoparticles have the advantages of non-toxicity, corrosion resistance, and low cost, and are widely used in the fields of gas sensors, electrode materials, coatings, catalysts, magnetic materials, and medical and biological engineering. α-Fe 2 o 3 The physical and chemical properties of nanoparticles are mainly determined by its shape and size, so looking for a method that can effectively control α-Fe 2 o 3 Synthetic methods of nanoparticle morphology and size become particularly important. Currently, synthetic α-Fe 2 o 3 Nanoparticle methods mainly include co-precipitation method, pyrolysis method, microemulsion method, and...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 陆安慧王光辉袁媛
Owner DALIAN UNIV OF TECH
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