Low-temperature industrial preparation method of monodisperse superparamagnetic gamma-Fe2O3 nanoparticles

A nanoparticle and superparamagnetic technology, which is applied in the field of nanomaterial preparation and technical application, can solve the problems of toxicity, high temperature energy consumption, complex process, etc., and achieve the effect of simple process, less environmental pollution and short process flow

Inactive Publication Date: 2011-03-30
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with this route is that either toxic and expensive organometallic compound raw materials are used, or high t...

Method used

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  • Low-temperature industrial preparation method of monodisperse superparamagnetic gamma-Fe2O3 nanoparticles
  • Low-temperature industrial preparation method of monodisperse superparamagnetic gamma-Fe2O3 nanoparticles
  • Low-temperature industrial preparation method of monodisperse superparamagnetic gamma-Fe2O3 nanoparticles

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Experimental program
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Embodiment 1

[0035] Embodiment 1 Monodisperse superparamagnetic γ-Fe 2 o 3 Low-temperature (sol-gel) industrial preparation of nanoparticles: the raw material is ferrous chloride, and methanol is used as a solvent to prepare a transparent salt solution with a concentration of 0.2M, and then add an organic gelling agent with a molar ratio of 5 to ferrous ions Dichloromethane, after mixing evenly, place the solution in a 60°C water bath and stir for 2 hours, then dry the obtained sol at 100°C until a xerogel is obtained, and gently grind to obtain a loose monodisperse superparamagnetic γ-Fe 2 o 3 Nanoparticles.

[0036] figure 2 The resulting monodisperse superparamagnetic γ-Fe 2 o 3 The X-ray diffraction pattern of nanoparticles, it can be judged that the diffraction peak in the figure is γ-Fe 2 o 3 The characteristic diffraction peak, and from its broadened peak, it can be judged that its particle size is in the nanometer range. image 3 For the monodisperse superparamagnetic γ-Fe...

Embodiment 2

[0037] Embodiment 2 Monodisperse superparamagnetic γ-Fe 2 o 3 Low-temperature industrial preparation of nanoparticles: ethanol is used as the solvent, and the others are the same as in Example 1.

Embodiment 3

[0038] Example 3 Monodisperse Superparamagnetic γ-Fe 2 o 3 Low-temperature industrial preparation of nanoparticles: the raw material is ferrous chloride, and methanol is used as a solvent to prepare a transparent salt solution with a concentration of 0.8M, and then add organic gelling agent ethylene oxide with a molar ratio of 5 to ferrous ions and Propylene oxide, after mixing evenly, place the solution in a 40°C water bath and stir for 0.5 hours, then pass air into the sol to oxidize for 2 hours to obtain dry gel, and obtain loose γ-Fe after light grinding 2 o 3 Nanoparticles.

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Abstract

The invention discloses a novel low-temperature sol-gel industrial synthetic method of monodisperse superparamagnetic gamma-Fe2O3 nanoparticles, organic small molecules are adopted as novel gelling agents, and the sol-gel reaction is carried out while stirring under water bath conditions in ferrous salt solution; and the obtained sol is dried for obtaining products of the gamma-Fe2O3 nanoparticles. The characterization results show that the prepared products are the monodisperse spherical gamma-Fe2O3 nanoparticles with narrow particle size distribution, and the particle size can be controlled between 2-10nm by regulating the concentration of ferrous salt in reaction solution. The method adopts cheap raw materials, the used process is simple, the reaction can be carried out under low temperature and normal pressure, and no or few pollutants are discharged, thereby being applicable to large-scale industrial production.

Description

technical field [0001] The invention relates to the preparation and technical application of nanomaterials, specifically the preparation of monodisperse superparamagnetic γ-Fe by a new low-temperature route 2 o 3 Low-temperature industrialization of nanoparticles. Background technique [0002] γ-Fe 2 o 3 Widely used as high-density magnetic recording materials, when the particle size drops to submicron or lower, γ-Fe 2 o 3 The application can be extended to new technology fields such as magnetic liquid, gas sensor, magnetic refrigeration, information storage, drug delivery, magnetic resonance imaging, catalysis, magneto-optic; and when its size is further reduced below the theoretical critical value of 24.8nm, It will show superparamagnetic properties, when there is an external magnetic field, it will show strong magnetism, but when the external magnetic field is withdrawn, there will be no residual magnetism, and it will no longer show magnetism. This superparamagnetic...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 崔洪涛
Owner YANTAI UNIV
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