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Method for producing water dispersing magnetic nano particle with high-crystallinity

A technology of magnetic nanoparticles and particles, which is applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of low crystallinity and weak magnetic response, and achieve high crystallinity, strong magnetic response, and cheap raw materials. The effect

Inactive Publication Date: 2004-11-24
苏州欣影生物医药技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ultrasonic decomposition is the use of ultrasonic cavitation to instantly decompose volatile organic metal compounds (such as Fe(CO) 5 ) to prepare nanoparticles, the particle size obtained by this method is uniform, but the crystallinity is very low, and the magnetic response is also very weak

Method used

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  • Method for producing water dispersing magnetic nano particle with high-crystallinity
  • Method for producing water dispersing magnetic nano particle with high-crystallinity
  • Method for producing water dispersing magnetic nano particle with high-crystallinity

Examples

Experimental program
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Effect test

specific Embodiment 1

[0022] Weigh 0.43g of ferric chloride and dissolve it in 50ml of dry α-pyrrolidone, heat to reflux for 40 minutes, cool to room temperature, precipitate with a large amount of methanol (or ethanol, isopropanol, butanol, acetone), centrifuge and Precipitation of magnetic nanoparticles can be obtained. From the TEM photographs of the obtained microparticles ( figure 1 (A)) It can be seen that the particle size is 3nm, and the particle size distribution is narrow. X-ray diffraction analysis (XRD) ( figure 2 (A)) It can be seen that the obtained particles are γ-Fe 2 o 3 , but the crystallinity of the particles is low and the magnetic response is relatively weak.

specific Embodiment 2

[0023] Weigh 0.31g Fe(CO) 5 Dissolve in 50ml of α-pyrrolidone, heat to 244°C and reflux for 60 minutes, and the rest of the operations are the same as in Example 1. figure 1 (B) is a TEM photo of the obtained microparticles. It can be seen from the figure that the particle diameter is 6 nm, and the particle diameter is uniform. XRD( figure 2 (B)) shows that the obtained particles are γ-Fe 2 o 3 , and the crystallinity of the particles is higher, and the magnetic response is stronger.

specific Embodiment 3

[0024] Weigh 0.56g FeCup 3 Dissolve in 100ml of polyethylene glycol (M=400), heat and reflux for 120 minutes, and the rest of the operations are the same as in Example 1. figure 1 (C) is a TEM photograph of the obtained microparticles. It can be seen from the figure that the particle diameter is 10 nm, and the particle diameter is uniform. XRD( figure 2 (C)) shows that the obtained particles are also γ-Fe 2 o 3 , the diffraction peaks are stronger, the crystallinity is higher, and the magnetic response is also enhanced.

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Abstract

The new method for preparing high crystallinity monodisperse water-soluble magnetic nano microparticles is characterized by that it selects the inorganic iron salts of anhydrous iron trichloride and iron chloride, etc. or metal organic iron compounds (such as iron pentacarbonyl, iron triacetylacetonate, iron biacetylacetonate, complex of cupferron and iron salt, iron octoate and ferric oxalate, etc.) as iron raw material, and utilizes high-temp. decomposition of them in high boiling point polar solvent (for example alpha-pyrrolidone and its derivatives (N-methyl-2-pyrrolidone and N-ethyl-2-pyrrolidone, etc.), N,N-dimethyl-2-imidazolone, hexametapol, gamma-butyrolactone and its derivative and low molecular weight (molecular weight M is less than or equal to 5000) polyglycol and its derivatives) to prepare magnetic nano microparticles. Said invention can adopts different iron raw materials and high boiling point polar solvents so as to obtain different types of magnetic nano microparticles (Fe, Fe2O3 and Fe3O4) with different sizes and crystallinities and different crystal structures.

Description

Technical field: [0001] The invention relates to a method for preparing water-dispersible magnetic nanoparticles with high crystallinity and monodispersity in a high-boiling polar solvent by one-step reaction. Background technique: [0002] Small size effects, quantum size effects, surface effects, etc. make nanoparticles (nanocrystals) have magnetic properties that conventional coarse-grained materials do not have. For example, the magnetic properties of iron and its oxide nanoparticles strongly depend on the size of the particles and crystallinity, when Fe, γ-Fe 2 o 3 , Fe 3 o 4 When the size of nanocrystals is less than 5nm, 16nm, 20nm, these particles exhibit superparamagnetism. Therefore, nanoparticle materials with different magnetic properties can be obtained by adjusting the particle size and crystallinity. Among the many magnetic nanoparticles, the research on iron and its oxides is the most extensive. It has a wide range of applications in many fields such as...

Claims

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Application Information

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IPC IPC(8): B82B3/00H01F41/02
Inventor 高明远李桢
Owner 苏州欣影生物医药技术有限公司
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