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Preparation method of high-stability water-based nano magnetic fluid

A nano-magnetic, high-stability technology, applied in the field of materials, can solve the problems of high equipment requirements, unfavorable mass production, and wide particle size distribution, and achieve high saturation magnetization, good biocompatibility, and excellent stability. Effect

Inactive Publication Date: 2019-03-26
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has certain shortcomings, such as a wide range of particle size distribution, and the product is easy to agglomerate, etc.
The thermal decomposition method can prepare nano-magnetic fluids with narrow particle size distribution, high saturation magnetization and good stability, but the output is small, which is not conducive to mass production; the reaction needs to be carried out under high temperature and high pressure conditions, which requires high equipment requirements ; At the same time, it is necessary to avoid Fe 3 o 4 The nanoparticles are oxidized, which further complicates the experiment

Method used

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  • Preparation method of high-stability water-based nano magnetic fluid
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  • Preparation method of high-stability water-based nano magnetic fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Add deionized water to a 250 mL three-neck flask under nitrogen protection, and heat up to 60 °C; then dissolve 2.35 g FeCl in dilute hydrochloric acid 3 ·6H 2 O, 1.2 g FeSO 4 ·7H 2 O was added to the above-mentioned three-necked flask, and stirred slowly for 5 min; under vigorous stirring, 50 mL of ammonia solution (concentration: 23 wt%) was quickly added to the iron salt solution, and the solution quickly turned black, and 1 g of ferric oxide nanoparticles were obtained. ; Subsequently, dextran was added 10 times in 20 min, 0.1 g each time, to modify the surface of the ferric oxide nanoparticles generated, the reaction temperature was raised to 70 °C, and the reaction was continued for 60 min; the heating was turned off, Cool the black suspension to room temperature, wash the prepared iron ferric oxide nanoparticles with deionized water, and perform magnetic separation, repeat several times until the solution is neutral and the conductivity is small, and the unreac...

Embodiment 2

[0032] Add deionized water to a 250 mL three-neck flask under nitrogen protection, and heat up to 50 °C; then dissolve 2.35 g FeCl in dilute hydrochloric acid 3 ·6H 2 O, 1.2 g FeSO 4 ·7H 2O was added to the above-mentioned three-necked flask, and stirred slowly for 5 min; under vigorous stirring, 45 mL of ammonia solution (24 wt%) was quickly added to the iron salt solution, and the solution quickly turned black to obtain 1 g of ferric oxide nanoparticles ; Subsequently, dextran was added 10 times in 20 min, adding 0.1 g each time, to modify the surface of the generated Fe3O4 nanoparticles, and the reaction temperature was increased to 70 °C, and the reaction was continued for 90 min; the heating was turned off, Cool the black suspension to room temperature, wash the prepared iron ferric oxide nanoparticles with deionized water, and perform magnetic separation, repeat several times until the solution is neutral and the conductivity is small, and the unreacted Fe 2+ , Fe 3+...

Embodiment 3

[0034] Add deionized water to a 250 mL three-neck flask under nitrogen protection, and heat up to 60 °C; then dissolve 2.35 g FeCl in dilute hydrochloric acid 3 ·6H 2 O, 1.2 g FeSO 4 ·7H 2 O was added to the above-mentioned three-necked bottle, and stirred slowly for 5 min; under vigorous stirring, 45 mL of ammonia solution (mass concentration: 24wt%) was quickly added to the iron salt solution, and the solution quickly turned black to obtain 1 g of ferric oxide Nanoparticles; then, dextran was added 10 times in 20 min, 0.14 g each time, to modify the surface of the ferric oxide nanoparticles, and the reaction temperature was raised to 70 ℃, and the reaction was continued for 60 min; close Heating, cooling the black suspension to room temperature, washing the prepared iron ferric oxide nanoparticles with deionized water, and performing magnetic separation, repeating several times until the solution is neutral and the conductivity is small, to remove unreacted Fe 2+ , Fe 3+...

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Abstract

The invention relates to a preparation method of high-stability water-based nano magnetic fluid. The water-based nano magnetic fluid is prepared through a chemical co-precipitation method which includes the steps that after ferric salt is dissolved by acid, the dissolved ferric salt is added into a three-necked bottle containing deionized water and stirred, under the protection of gas, alkali is quickly added to react with ferric salt precursor, then a macromolecular surfactant is added, reaction continues after the temperature is increased, obtained magnetic nanoparticles are subjected to ultrasonic dispersion, and thus the water-based nano magnetic fluid is obtained. The preparation method of the high-stability water-based nano magnetic fluid has the advantages that the prepared water-based nano magnetic fluid has excellent stability, and can be kept stable without precipitation for a long time when placed still under a room temperature condition and in a magnetic field; since the surfactant adopted in the preparation process is good in biocompatibility, the prepared water-based nano magnetic fluid has no biological toxicity, has high saturation magnetization, can serve as a contrast agent for a nuclear magnetic resonance imaging signal T2 and has extremely high practicability in the field of biomedicine.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a high-stability water-based nano-magnetic fluid. Background technique [0002] Nano-magnetic fluid is a new type of functional material, which has both the fluidity of liquid and the strong magnetism of solid magnetic materials. into a stable colloidal liquid. The most notable feature of nano-magnetic fluid is superparamagnetism, that is, magnetic nanoparticles are magnetized under an external magnetic field, and when there is no external magnetic field, they do not exhibit magnetism as a whole. It is precisely because of the unique properties of nano-magnetic fluid that it is widely used in many fields such as aerospace, biomedicine, machinery, and environmental protection. It is a research hotspot in the fields of physics, chemical engineering, materials science and engineering, and biomedicine. [0003] Water-based nano-magnetic fluids ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08A61K49/06B82Y30/00H01F1/44H01F41/00
CPCA61K49/06B82Y30/00C01G49/08C01P2004/04C01P2004/64C01P2006/42H01F1/445H01F41/00
Inventor 洪若瑜武倩杜淑敏
Owner FUZHOU UNIV
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