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Preparation and application of a magnetic one-dimensional chain nanocomposite

A nanocomposite and chain-like technology, applied in the field of nanomaterials, can solve problems such as application limitations, unstable performance of magnetic one-dimensional nanomaterials, and complicated preparation process, and achieve the effects of simple and easy operation, prevention of agglomeration, and avoidance of corrosion

Active Publication Date: 2020-11-10
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in the prior art, using SiO 2 The preparation process of coated magnetic one-dimensional nanomaterials is too complicated, and the performance of the prepared magnetic one-dimensional nanomaterials is unstable, which limits its application

Method used

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  • Preparation and application of a magnetic one-dimensional chain nanocomposite
  • Preparation and application of a magnetic one-dimensional chain nanocomposite
  • Preparation and application of a magnetic one-dimensional chain nanocomposite

Examples

Experimental program
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Effect test

Embodiment 1

[0046] (1) Fe 3 o 4 Preparation of nanospheres: fully dissolve 3g of ferric chloride hexahydrate in 70ml of ethylene glycol, slowly add 4.8g of anhydrous sodium acetate and 0.83g of sodium citrate, fully stir for 30min, then pour into the reaction kettle, and heat up to Keep at 200°C for 10h, then naturally lower to room temperature (such as 15°C), wash with water and alcohol three times, put it in an oven, and dry at 50°C for 6h to obtain Fe 3 o 4 nanospheres;

[0047] (2) Fe 3 o 4 @SiO 2 @PDA-Ni 2+ Preparation: Weigh the Fe prepared according to step (1) 3 o 4 100 mg of nanospheres, dispersed in a mixed solvent composed of 90 ml of ethanol and 15 ml of water, after ultrasonic dispersion for 30 min, add 2 mL of ammonia water with a mass fraction of 1%, place it in a magnetic field, stir for 5 min, and then add 200 μL of ethyl orthosilicate dropwise , after stirring in a magnetic field at room temperature for 17h, a mixture A was prepared; 15mg dopamine and 37.6mg NiC...

Embodiment 2

[0054] In order to prove the influence of the amount of TEOS (i.e. tetraethyl orthosilicate) on the degree of magnetically induced self-assembly ordering, under the same experimental conditions and steps as in Example 1, only the amount of TEOS was changed, and the amounts of TEOS were respectively Set to 100μL, 200μL, 400μL to obtain Fe with different thickness of silica 3 o 4 @SiO 2 and Fe 3 o 4 @SiO 2 @PDA-Ni 2+ , and finally the magnetic one-dimensional chain nanocomposite Fe 3 o 4 @SiO 2 @C / Ni.

[0055] figure 2 For the Fe prepared in Example 2 3 o 4 @SiO 2 The SEM and TEM images of , in which the images a and b respectively show the Fe 3 o 4 @SiO 2 The SEM and TEM images of Fig. 1, Fig. c and d respectively show the Fe 3 o 4 @SiO 2 The SEM and TEM images of the graphs, graphs e and f are respectively when the amount of TEOS is 400 μL, Fe 3 o 4 @SiO 2 SEM and TEM images. As can be clearly seen from the figure, the method described in Example 2 is ad...

Embodiment 3

[0057] In order to prove the influence of the magnetic field strength on the length of the one-dimensional chain of magnetically induced self-assembly, on the basis of the same experimental conditions and steps as in Example 1, only the strength of the magnetic field was changed, which were 300mT, 200mT and 150mT respectively, to obtain the one-dimensional chain length Different Fe 3 o 4 @SiO 2 @PDA-Ni 2+ , and after step (3) treatment, the magnetic one-dimensional chain nanocomposite Fe 3 o 4 @SiO 2 @C-Ni.

[0058] image 3 Fe obtained under different magnetic field strengths in the embodiment of the present invention 3 o 4 @SiO 2 The SEM and TEM images of @C / Ni, in which, images a and b are respectively Fe under a magnetic field strength of 300mT 3 o 4 @SiO 2 The SEM and TEM images of @C / Ni, Figures c and d are respectively Fe under the magnetic field strength of 200mT 3 o 4 @SiO 2 SEM and TEM images of @C / Ni, images e and f are respectively Fe under a magneti...

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Abstract

The invention discloses a preparation method of a magnetic one-dimensional chain-shaped nano composite. The method comprises preparation of Fe3O4 nano microspheres, preparation of Fe3O4@SiO2@PDA-Ni2+and preparation of Fe3O4@SiO2@C / Ni. The Fe3O4@SiO2@PDA-Ni<2+> is prepared by adding 80 to 120 mg of Fe3O4 nano microspheres into a mixed solvent composed of ethanol and water, adding ammonia water, placing the mixture in a magnetic field, stirring the mixture, adding ethyl orthosilicate, stirring the mixture to obtain a mixture A; mixing and dissolving 8 to 20 mg of dopamine and 30 to 40 mg of Nisalt in an aqueous solution of ethanol to obtain a mixture B, then adding the mixture B to the mixture A, stirring the mixture in the magnetic field, and performing washing and drying. The magnetic one-dimensional chain-shaped nano composite has a simple preparation process and is suitable for industrial mass production. The magnetic one-dimensional chain-shaped nano composite has paramagnetism, can be magnetically separated, can be recycled, can be used for catalytic degradation of an aromatic nitro group dyes, and can also be used for the enrichment, purification and separation of proteins.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to the preparation and application of a magnetic one-dimensional chain nanocomposite. Background technique [0002] At present, researchers at home and abroad have achieved some results in the assembly of nanomaterials induced by external magnetic fields. One-dimensional, two-dimensional, three-dimensional and composite ordered structure materials have been obtained through magnetic field-induced self-assembly. , magnetism and other aspects have special properties and have broad application prospects. The study found that compared with the disordered magnetic nanomaterials, the magnetic nanomaterials with ordered structure have significantly improved magnetic properties such as saturation magnetization, coercive force and residual magnetization compared with disordered dispersed magnetic nanomaterials. . [0003] So far, the general synthesis methods of 1D nanomaterials are divi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/00
Inventor 张敬万忠民方文华汤涛李春来
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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