Homodisperse ferrite magnetic manoparticles and preparation method thereof

A technology of magnetic nanoparticles and uniform dispersion, applied in the direction of magnetism of inorganic materials, can solve the problems of low crystallinity, high energy consumption, impurities in products, etc., and achieve the effect of saving production energy consumption, reducing processing temperature and high purity

Inactive Publication Date: 2012-01-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method has mild reaction conditions and low energy consumption, the product often contains heterogeneous phases, or has low crystallinity, and the particles are prone to agglomeration, making it difficult to form uniformly dispersed nanoparticles.
Or by solid-phase synthesis, for example: high-energy ball milling method [2.Liming Yu, et al.Fabrication, structure and magnetic properties of nanocrystalline NiZn-ferrite by high-energy milling.J.Mag.Mag.Mater.2005,288,54- 59.], the method first mixes and reacts the metal oxides by mechanical ball milling, and then requires high-temperature treatment (generally above 1000°C) to obtain a pure-phase ferrite material. This method has a long reaction cycle, high energy consumption, and Particle size is often not uniform

Method used

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  • Homodisperse ferrite magnetic manoparticles and preparation method thereof
  • Homodisperse ferrite magnetic manoparticles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1.7441g Ni(NO 3 ) 2 ·6H 2 O and 4.8462g Fe(NO 3 ) 3 9H 2 O was added to 30ml deionized water to prepare a mixed salt solution, in which Ni 2+ The molar concentration is 0.2mol L -1 , Fe 3+ The molar concentration is 0.4mol L -1 30 milliliters of mixed alkaline solutions are prepared with 1.152g sodium hydroxide and 2.544g sodium carbonate, wherein the molar concentration of sodium hydroxide is 0.96mol L -1 , the concentration of sodium carbonate is 0.8mol L -1 .

[0024] The prepared salt solution and alkali solution were quickly poured into the fully back-mixed liquid membrane reactor at room temperature, and vigorously rotated and stirred for 3 minutes at a speed of 2000 rpm. The obtained suspension was centrifuged and dehydrated (centrifugal speed 4000 rpm), then washed with deionized water, and the operation was repeated 3 times to obtain hydroxide crystal nuclei;

[0025] Dissolve 3.24g of glucose into 30ml of deionized water to prepare a solution, mix t...

Embodiment 2

[0028] 2.6162g Ni(NO 3 )2 ·6H 2 O and 7.2693g Fe(NO 3 ) 3 9H 2 O was added to 30ml deionized water to prepare a mixed salt solution, in which Ni 2+ The molar concentration is 0.3mol L -1 , Fe 3+ The molar concentration is 0.6mol L -1 30 milliliters of mixed alkaline solutions are prepared with 1.728g sodium hydroxide and 3.816g sodium carbonate, wherein the sodium hydroxide molar concentration is 1.44mol L -1 , the concentration of sodium carbonate is 1.2mol L -1 .

[0029] The prepared salt solution and alkali solution were quickly poured into the fully back-mixed liquid membrane reactor at room temperature, and vigorously rotated and stirred for 2 minutes at a speed of 2500 rpm. The obtained suspension was centrifuged and dehydrated (centrifugal speed 4500 rpm), washed with deionized water, and the operation was repeated 3 times to obtain hydroxide crystal nuclei;

[0030] Dissolve 3.24g of glucose into 30ml of deionized water to prepare a solution, mix the precipi...

Embodiment 3

[0033] 0.8721g Ni(NO 3 ) 2 ·6H 2 O, 0.8922g Zn(NO 3 ) 2 ·6H 2 O and 4.8462g Fe(NO 3 ) 3 9H 2 O was added to 30ml deionized water to prepare a mixed salt solution, in which Ni 2+ The molar concentration is 0.1mol L -1 , Zn 2+ The molar concentration is 0.1molL -1 , Fe 3+ The molar concentration is 0.4mol L -1 30 milliliters of mixed alkaline solutions are prepared with 1.152g sodium hydroxide and 2.544g sodium carbonate, wherein the molar concentration of sodium hydroxide is 0.96mol L -1 , the concentration of sodium carbonate is 0.8mol L -1 .

[0034] The prepared salt solution and alkali solution were quickly poured into the fully back-mixed liquid membrane reactor at room temperature, and vigorously rotated and stirred for 2 minutes at a speed of 2500 rpm. The obtained suspension was dehydrated by centrifugation (centrifugal speed 4500 rpm), and then washed with deionized water, and the operation was repeated 3 times to obtain hydroxide crystal nuclei;

[003...

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Abstract

The invention discloses a method for preparing homodisperse ferrite magnetic manoparticles by hydroxide / carbon compound precursor. The method comprises: using a full back-mixing liquid membrane reactor (patent CN1358691) to evenly mix metal salt solution and alkaline solution to generate hydroxide crystal nucleus; preparing hybridization compound precursor of hydroxide and carbon by hydrothermal reaction; and then, under certain temperature condition, carrying out heat treatment to lead the precursor compound to be transformed into ferrite. As the hydroxide precursor is transformed into the ferrite, divalent and trivalent metal ions can be evenly mixed together on the molecular level, the composition of the ferrite can be ensured to be in accordance with the stoichiometric proportion, andpure products can be obtained. The content of the carbon in the compound is adjustable, and the carbon can be gradually oxidized and removed in the process of calcination, so that the particle size and the dispersibility of the ferrite can be adjusted, and no agglomeration phenomenon occurs among the particles. The nickel-ferrite prepared by the method has the chemical formula of Ni1-x Znx Fe2O4,wherein x is within the range of 0-0.5. The particle size is 5-40nm, and the specific saturation magnetization intensity is 16-40e mu / g. The ferrite nanoparticles are evenly dispersed without agglomeration.

Description

technical field [0001] The invention belongs to the field of magnetic nano material preparation. It specifically relates to nickel-based ferrite nanoparticles and a preparation method thereof. The ferrite particles obtained by the method have the advantages of controllable size, narrow size distribution, uniform dispersion and adjustable magnetic properties. Background technique [0002] As an important magnetic material, ferrite has important and extensive applications in the fields of magnetic recording, magnetic fluid, magnetic drug carrier and targeted delivery, and medical diagnosis. When the size of the material is reduced to the nanometer level, its specific surface area is greatly increased, and the number of surface atoms is significantly increased. The surface atoms of the material will generate a large number of unsaturated bonds and become extremely active. Therefore, nanomaterials will exhibit unique properties different from traditional bulk materials in terms...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/36C04B35/626C04B35/26
Inventor 项顼田宗民白璐李峰
Owner BEIJING UNIV OF CHEM TECH
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