Fe3O4@SiO2@ZnO ternary heterostructure core-shell nanoparticle and preparation method therefor

A nano-microsphere, core-shell technology, which is applied in the field of Fe3O4@SiO2@ZnO ternary heterogeneous core-shell nano-microspheres and its preparation, can solve the problem of non-coated, uneven coating layer, ternary heterogeneous core-shell The structural nano-microspheres are easy to agglomerate and other problems, so as to achieve the effects of low cost, good dispersibility, and avoiding uneven coating layer.

Inactive Publication Date: 2016-03-02
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve Fe 3 o 4 Based on the shortcomings of ternary heterogeneous core-shell structure nano-microspheres, which are easy to agglomerate, uneven coating, and not covered, so as to provide a Fe with uniform coating, dispersion, uniformity and good magnetic response. 3 o 4 @SiO 2 @ZnO ternary heterogeneous core-shell nanospheres and preparation method thereof

Method used

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  • Fe3O4@SiO2@ZnO ternary heterostructure core-shell nanoparticle and preparation method therefor
  • Fe3O4@SiO2@ZnO ternary heterostructure core-shell nanoparticle and preparation method therefor
  • Fe3O4@SiO2@ZnO ternary heterostructure core-shell nanoparticle and preparation method therefor

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Embodiment 1

[0028] (1) Take 0.1g of Fe with a particle size of about 300nm 3 o 4 Nanospheres (for the preparation method, see the document ActaMater.61(2013) 5829-5834), dispersed in 100mL of 0.15M trisodium citrate aqueous solution by ultrasonic and stirred for 4h;

[0029] (2) After the stirring is completed, the Fe which has been modified by trisodium citrate 3 o 4 Nanospheres dispersed in 20mLH 2 O / 80mL ethanol mixed solution, and add 1mLNH 3 .H 2 O, then the mixed solution was transferred to a three-necked flask, and under continuous stirring, 20ml of ethanol solution containing 0.3mL tetraethyl orthosilicate was added dropwise, and after the addition was completed, stirring was continued at room temperature for 12h to obtain Fe 3 o 4 @SiO 2 Binary heterogeneous core-shell nanospheres;

[0030] (3) Fe 3 o 4 @SiO 2 Nanospheres dispersed in 100mL0.03MZn(Ac) 2 .2H 2 O in ethanol solution, then transfer the mixed solution to a three-necked flask, and add 25mL of 0.125M NaOH ...

Embodiment 2

[0034] (1) Take 0.1g of Fe with a particle size of about 300nm 3 o 4 Nanospheres, dispersed in 100mL 0.15M trisodium citrate aqueous solution by ultrasonic and stirred for 4h;

[0035] (2) After the stirring is completed, the Fe which has been modified by trisodium citrate 3 o 4 Nanospheres dispersed in 20mLH 2 O / 80mL ethanol mixed solution, and add 1.5mLNH 3 .H 2 O, then the mixed solution was transferred to a three-necked flask, and under continuous stirring, 30ml of ethanol solution containing 0.45mL tetraethyl orthosilicate was added dropwise, and after the addition was completed, stirring was continued at room temperature for 16h to obtain Fe 3 o 4 @SiO 2 Binary heterogeneous core-shell nanospheres;

[0036] (3) Fe 3 o 4 @SiO 2 Nanospheres dispersed in 100mL0.03MZn(Ac) 2 .2H 2 O in ethanol solution, then transfer the mixed solution to a three-necked flask, and add 25mL of 0.125M NaOH ethanol solution dropwise under the condition of 60°C water bath, and contin...

Embodiment 3

[0038] (1) Take 0.1g of Fe with a particle size of about 300nm 3 o 4 Nanospheres, dispersed in 100mL 0.225M trisodium citrate aqueous solution by ultrasonic and stirred for 6h;

[0039] (2) After the stirring is completed, the Fe which has been modified by trisodium citrate 3 o 4 Nanospheres dispersed in 20mLH 2 O / 80mL ethanol mixed solution, and add 1.5mLNH 3 .H 2 O, then the mixed solution was transferred to a three-necked flask, and under continuous stirring, 30ml of ethanol solution containing 0.45mL tetraethyl orthosilicate was added dropwise, and after the addition was completed, stirring was continued at room temperature for 16h to obtain Fe 3 o 4 @SiO 2 Binary heterogeneous core-shell nanospheres;

[0040] (3) Fe 3 o 4 @SiO 2 Nanospheres dispersed in 100mL0.04MZn(Ac) 2 .2H 2 O in ethanol solution, then transfer the mixed solution to a three-necked flask, and add 25mL of 0.1875M NaOH ethanol solution dropwise in a water bath at 70°C, and continue to stir fo...

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Abstract

The invention discloses an Fe3O4@SiO2@ ZnO ternary heterostructure core-shell nanoparticle and a preparation method therefor. The preparation method comprises the steps of obtaining an Fe3O4 nanoparticle through a conventional hydrothermal method; performing surface modification on the Fe3O4 nanoparticle through a trisodium citrate water solution; and coating the surface of the modified Fe3O4 nanoparticle with SiO2 through a Stober method to obtain an Fe3O4@SiO2 nanoparticle; and coating the surface of the Fe3O4@SiO2 nanoparticle with ZnO through thermal decomposition of zinc salt to obtain the Fe3O4@SiO2@ZnO nanoparticle. The preparation method solves the shortcomings of high probability of agglomeration, uneven coating layer, incomplete coating and the like existing in the preparation of the Fe3O4 based ternary heterostructure core-shell nanoparticle; the prepared Fe3O4@SiO2@ZnO ternary heterostructure core-shell nanoparticle is uniform in the coating layer, and extremely high in the dispersity, uniformity, magnetic responsiveness and wave absorption property; and in addition, the preparation process is environment-friendly and pollution-free.

Description

technical field [0001] The present invention relates to a kind of Fe 3 o 4 @SiO 2 The @ZnO ternary heterogeneous core-shell nanosphere and its preparation method belong to the field of wave-absorbing material preparation. Background technique [0002] With the development of modern society, the research and development of absorbing materials not only has far-reaching significance in the military, but also plays an extremely important role in reducing electromagnetic pollution in daily life and improving the living environment of human beings. Nano Fe 3 o 4 As a traditional magnetic loss absorbing material, it has the characteristics of low price and strong absorption, but has the disadvantages of high density and poor high temperature stability, so its application range is limited. So the nano-Fe 3 o 4 Composite with dielectric loss absorbing materials, through a variety of absorbing mechanisms to enhance absorbing performance, in order to achieve a good absorbing eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/36C01B33/12C01B9/02B01J13/02
Inventor 姜炜王彦平孙丹萍刘功总
Owner NANJING UNIV OF SCI & TECH
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