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Nano-ferrite composite material with double-shell structure and preparation method thereof

A technology of nano-ferrite and composite materials, which is applied in the field of nano-ferrite composite materials and its preparation, and can solve the problems of poor chemical stability, easy agglomeration, and low specific surface area of ​​spinel-type ferrite nanoparticles , to achieve the effect of improving chemical stability, increasing specific surface area and good dispersion

Active Publication Date: 2020-05-01
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The technical problem solved by the present invention is that the spinel ferrite nanoparticles have poor chemical stability, easy agglomeration, and low specific surface area.

Method used

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  • Nano-ferrite composite material with double-shell structure and preparation method thereof
  • Nano-ferrite composite material with double-shell structure and preparation method thereof
  • Nano-ferrite composite material with double-shell structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Described a kind of double-shell structure nano-ferrite composite material (using NiFe 2 o 4 The preparation method for nucleus) comprises the steps:

[0062] (1) 10.4992g Fe(NO 3 ) 3 9H 2 O and 3.7980gNi(NO 3 ) 2 ·6H 2 O was dissolved in 250ml ethanol and stirred for 2-3h to obtain a transparent solution; 8.0689g citric acid was dissolved in 250ml ethanol and stirred for 2-3h to obtain a transparent solution. Under vigorous stirring, the citric acid-ethanol solution is added to the mixed metal nitrate-ethanol solution under stirring, and the stirring is continued for 4 hours to obtain a complex metal nitrate-citric acid ethanol solution;

[0063] (2) Under vigorous stirring, the pH value of the complex metal nitrate-citric acid ethanol solution obtained in step (1) is adjusted to 4.0 with a concentration of 1.5mol / L ammonia, and the stirring is continued for 24h to form a complex transition metal hydrogen oxide suspension;

[0064] (3) Add about 40 g of absorb...

Embodiment 2

[0074] Described a kind of double-shell structure nano-ferrite composite material (with Ni 0.6 Zn 0.4 Fe 2 o 4 The preparation method for nucleus) comprises the steps:

[0075] (1) 10.3808g Fe(NO 3 ) 3 9H 2 O and 2.2531g Ni(NO 3 ) 2 ·6H 2 O, 1.5210g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 250ml ethanol and stirred for 2-3h to obtain a transparent solution; 7.9774g citric acid was dissolved in 250ml ethanol and stirred for 2-3h to obtain a transparent solution. Under vigorous stirring, the citric acid-ethanol solution is added to the mixed metal nitrate-ethanol solution under stirring, and the stirring is continued for 4 hours to obtain a complex metal nitrate-citric acid ethanol solution;

[0076] (2) Under vigorous stirring, adjust the pH value of the complex metal nitrate-citric acid ethanol solution obtained in step (1) to 4.0 with a concentration of 0.5mol / L ammonia, and continue to stir for 24h to form complex transition metal hydrogen oxide suspension;

[0077...

Embodiment 3

[0087] Described a kind of double-shell structure nano-ferrite composite material (with CoFe 2 o 4 The preparation method for nucleus) comprises the steps:

[0088] (1) 10.4885g Fe(NO 3 ) 3 9H 2 O and 3.7587g Co(NO 3 ) 2 ·6H 2 O was dissolved in 250mL ethanol and stirred for 2-3h to obtain a transparent solution; 8.0606g citric acid was dissolved in 250mL ethanol and stirred for 2-3h to obtain a transparent solution. Under vigorous stirring, the citric acid-ethanol solution is added to the mixed metal nitrate-ethanol solution under stirring, and the stirring is continued for 4 hours to obtain a complex metal nitrate-citric acid ethanol solution;

[0089] (2) Under vigorous stirring, the pH value of the complex metal nitrate-citric acid ethanol solution obtained in step (1) is adjusted to 5.0 with a concentration of 1.0mol / L ammonia, and the stirring is continued for 24h to form a complex transition metal hydrogen oxide suspension;

[0090] (3) Add about 40 g of absorb...

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Abstract

The invention discloses a multifunctional nanosized ferrite composite material with a double-shell structure and a preparation method of the multifunctional nanosized ferrite composite material. The composite material is prepared from spinel type nanosized ferrite as a nucleus, silicon dioxide as an intermediate layer and titanium dioxide as an outer shell layer. With adoption of the intermediatelayer, on one hand, chemical stability of a magnetic nucleus of the nanosized ferrite can be improved and the applicable range of the material can be extended, and on the other hand, influence of themagnetic nucleus on performance of the outer shell layer is prevented; the outer shell layer not only can endow the material with special characteristics of light, electricity, catalysis and the like,but also can be integrated with the characteristics of the magnetic nucleus, so that multifunctional nanoparticles are obtained. The preparation method mainly comprises steps as follows: a three-stepsol-gel method for material preparation, surface modification with function of improving dispersity and coating effect, ball milling, heat treatment process under atmosphere control and the like. Thenanosized ferrite particles with the double-shell structure have the advantages of relatively good dispersity, high specific surface area, tight combination of the shell layer and the nucleus; meanwhile, the application field of the material can be further expanded by modification of the shell layer.

Description

technical field [0001] The invention relates to a nano-ferrite composite material with a double-shell structure and a preparation method thereof, belonging to the field of magnetic inorganic nano-materials. Background technique [0002] Nano-ferrite materials not only have the small size effect and surface effect endowed by nano-materials, but also have excellent magnetic properties, such as a wide range of Curie temperature, variable magnetic parameters (such as magnetic permeability, saturation magnetic induction, remanence Strength, coercive force, temperature coefficient, etc.), magnetocrystalline anisotropy, magnetostrictive effect, excellent hysteresis loss performance in the kilohertz range, high specific surface area and special surface chemical properties, etc., are widely used for absorbing Wave materials, catalytic and adsorption materials, magnetic fluid materials, sensing materials, biomedical materials (magnetothermal therapy, targeted drugs, etc.), magnetic re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00B01J23/75H01F1/36H01F41/02B01J13/22B82Y30/00B82Y40/00
CPCB01J13/22B01J23/75B01J35/0033B82Y30/00B82Y40/00C01G49/0018C01G49/0063C01P2002/72C01P2004/04C01P2004/32C01P2004/64C01P2004/82C01P2006/12C01P2006/42H01F1/36H01F41/0253
Inventor 高朋召黄智博郑航博吴迪王玲
Owner HUNAN UNIV
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