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Method for preparing magnetic silica composite particles

A technology of silicon dioxide and composite particles, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of complicated regulation process, and achieve the effect of convenient and controllable size, simple and direct preparation process, and uniform particle size.

Inactive Publication Date: 2012-06-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the regulation of the polymerization process complicates the whole regulation process.

Method used

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  • Method for preparing magnetic silica composite particles
  • Method for preparing magnetic silica composite particles
  • Method for preparing magnetic silica composite particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Preparation of hydrophobic magnetic nanoparticles (1)

[0024] Add 0.046mol of Fe to 100mL of water that has been passed through nitrogen 3+ and 0.023mol of Fe 2+ A mixed solution was obtained. Get 400mL of water in a 1L reaction flask and pass through nitrogen to remove oxygen, add 20mL of concentrated ammonia water and 10.8g of oleic acid with a concentration of 25% in mass percentage successively, pour the above-mentioned iron salt mixed solution into it rapidly under vigorous stirring, React at 50°C for 1h. After the reaction is completed, adjust the reaction solution to acidity with hydrochloric acid, separate the black solid from the reaction solution with a 0.1T permanent magnet, and wash the obtained solid with high-purity water for 3 to 5 times to obtain the hydrophobic Fe 3 o 4 Nanoparticles.

[0025] Will Fe 3+ and Fe 2+ respectively replaced by Co 3+ and Co 2+ , the hydrophobic Co can be obtained 3 o 4 Nanoparticles.

Embodiment 2

[0026] Embodiment 2: Preparation of hydrophobic magnetic nanoparticles (2)

[0027] Add 0.046mol of Fe to 100mL of water that has been passed through nitrogen 3+ and 0.023mol of Fe 2+ A mixed solution was obtained. Get 400mL of water in a 1L round-bottomed flask, pass nitrogen to remove oxygen, add 20mL of concentrated ammonia water and 5.52g of myristic acid with a concentration of 25% in mass percentage successively, pour the above-mentioned iron salt mixed solution into it rapidly under vigorous stirring, React at 80° C. for 1 h. Oxygen was then introduced into the reaction solution for 2 h. After the reaction is completed, adjust the reaction solution to acidity with hydrochloric acid, separate the red solid from the reaction solution with a 0.1T permanent magnet, and wash the obtained solid with high-purity water for 3 to 5 times to obtain hydrophobic γ-Fe 2 o 3 Nanoparticles.

Embodiment 3

[0028] Embodiment 3: Preparation of hydrophobic magnetic nanoparticles (3)

[0029] Add 0.046mol of Fe to 100mL of water that has been passed through nitrogen 3+ and 0.023mol Co 2+ to obtain a mixed solution. Take 400mL of water and pass nitrogen to remove oxygen in a 1L reaction flask, add 20mL of concentrated ammonia water with a mass percentage concentration of 25% and 1.33g of 10-undecylenic acid in sequence, and quickly pour the above mixed solution into it under vigorous stirring , reacted at 90°C for 1h. After the reaction is completed, adjust the reaction solution to acidity with hydrochloric acid, separate the black solid from the reaction solution with a 0.1T permanent magnet, and wash the obtained solid with high-purity water for 3 to 5 times to obtain CoFe 2 o 4 Hydrophobic nanoparticles.

[0030] Will Co 2+ replace with Mn 2+ , the hydrophobic MnFe can be obtained 2 o 4 Nanoparticles.

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Abstract

The invention discloses a method for preparing magnetic silica composite particles, and belongs to the technical field of magnetic materials. A technical process comprises the following steps of: after obtaining magnetic oil drops dispersed in a water phase by a fine-emulsification process, obtaining a magnetic aggregate by volatilizing an oil phase; obtaining a silanophilic surfactant-adsorbed magnetic aggregate by replacing a surfactant; adding the magnetic aggregate into a pre-hydrolyzed system; and realizing the coating of a silica shell by adsorbing and growing silica species. By the method, the magnetic aggregate with a large number of magnetic nuclei is directly coated by the silica through the replacement of the silanophilic surfactant. The preparation method has simplicity and rapidness; the particle diameters of the obtained magnetic silica composite particles are uniform; and the final particle diameter and the content of the magnetic material can be controlled by regulating and controlling the size of the aggregate and the growth time of a silicon layer.

Description

Technical field: [0001] The invention belongs to the technical field of magnetic materials, in particular to a preparation method of magnetic silicon dioxide composite particles. Background technique: [0002] As we all know, magnetic silica nanocomposite particles have a very wide range of applications in the fields of biotechnology and medicine due to their good chemical stability and biocompatibility, such as the separation and purification of cells, proteins, DNA and RNA, and the orientation of drugs. delivery etc. These applications require the particles to have a relatively uniform and controllable particle size and a high magnetic content. The method and the sol-gel process are the most commonly used methods for preparing magnetic silica nanocomposite particles. The Philipse group (Langmuir 1994, 10, 92) added Fe to the alcohol-water system 3 o 4 Nanoparticles, and then under the catalysis of ammonia water, the continuous SiO 2 Shell coated magnetic composite pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/00H01F1/10C04B35/628
Inventor 杨文胜付融梁经纶金秀梅郑惟时
Owner JILIN UNIV
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