Method for preparing core-shell structured SiO2/Fe3O4 compound magnetic particle

A core-shell structure and particle technology, which is applied in the field of preparation of core-shell structure SiO2/Fe3O4 particles, can solve the problems of magnetic core agglomeration, small output, and difficulty in large-scale production, and achieve clear shell core structure, obvious dispersion, The effect of mild conditions

Inactive Publication Date: 2011-06-15
BEIJING UNIV OF CHEM TECH
View PDF2 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SiO prepared by microemulsion method 2 /Fe 3 o 4 The size of the magnetic composite particles is uniform and the dispersion is good. However, due to the limitation of the stability of the microemulsion system, the adjustable particle size range of the synthesized magnetic composite particles is limited, and the microemulsion system is very sensitive to the preparation temperature and component changes. However, the sol-gel method is favored by people because of its simple process, environmental friendliness and advantages of large-scale production. However, the structure and structure of the composite magneti

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing core-shell structured SiO2/Fe3O4 compound magnetic particle
  • Method for preparing core-shell structured SiO2/Fe3O4 compound magnetic particle
  • Method for preparing core-shell structured SiO2/Fe3O4 compound magnetic particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Measure 112ml of ethylene glycol as a solvent, dissolve 3.78g of ferric chloride and 10.08g of sodium acetate in ethylene glycol, stir at high speed with magnetic force for 10 minutes, then add an appropriate amount of polyethylene glycol (molecular weight 1500) and continue stirring After 30 minutes a mixed solution was obtained. Then pour it into a polytetrafluoroethylene-lined high-pressure reactor, seal the reactor and place it in an oven, heat it to 180°C and keep it warm for 9 hours. The precipitate was washed three times with deionized water until the pH of the solution was 7, then washed twice with ethanol, and dried in an oven at 60°C for 6 hours to obtain black Fe 3 o 4 powder.

[0018] Synthetic Fe 3 o 4 mother core see figure 1 , the particle size is about 400nm.

[0019] (2) At room temperature, mix 90ml of absolute ethanol, 22.5ml of deionized water, and 0.3g of the above-mentioned Fe 3 o 4 Powder, mixed with 0.5g sodium dodecylbenzene sulfonat...

Embodiment 2

[0022] Change the consumption of strong ammonia water to be 0.315ml, and the consumption of other medicines and operation steps are the same as embodiment 1.

Embodiment 3

[0024] Change the consumption of concentrated ammonia water to be 1.26ml, and the consumption of other medicines and operation steps are the same as embodiment 1.

[0025] Synthetic SiO 2 / Fe 3 o 4 Particles with shell core structure see image 3 , SiO 2 The thickness of the shell layer is about 40 nm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing a core-shell structured SiO2/Fe3O4 magnetic particle. The core-shell structured SiO2/Fe3O4 magnetic particle is characterized in that Fe3O4 is used as the magnetic core and SiO2 is used as the shell to form the SiO2/Fe3O4 core-shell covering structure. The method comprises the following steps: under the heat condition of a solvent glycol, taking ferric chloride as the Fe source, sodium acetate as a reducing agent and a right amount of polyethylene glycol as a dispersing agent, heating the system to 150-180 DEG C and then preserving heat for several hours; and after washing and drying, mixing the synthesized Fe3O4 powder with a right amount of absolute ethyl alcohol, deionized water and surfactants, dropwise adding a certain amount of stronger ammonia water, after ultrasonic dispersion, slowly dropwise adding tetraethoxysilane under the condition of stirring, continuing stirring for reaction for several hours and then washing and drying the product, thus obtaining the SiO2/Fe3O4 compound particle. The method has the following advantages: the process is simple; the cost is low; the reaction conditions are easy to control; the core-shell structured SiO2/Fe3O4 magnetic particle can be produced in a large scale; and therefore, the method has a good application prospect.

Description

technical field [0001] The invention relates to a core-shell structure SiO used as a magnetic carrier 2 / Fe 3 o 4 The particle preparation method belongs to the technical field of nanometer material preparation. technical background [0002] Magnetic Fe 3 o 4 As a new type of functional material, microspheres have good magnetic properties, such as superparamagnetism and high saturation magnetization, and are used as magnetic recording materials, magnetic liquids, sensors, catalyst carriers, permanent magnetic materials, pigments, radar wave Absorbing materials and other aspects have broad application prospects. However, due to the high specific surface area and strong aggregation tendency of magnetic nanoparticles, and the low chemical stability and easy oxidation, it is difficult to be directly applied. To solve these problems, surface modification of magnetic nanoparticles is necessary to stabilize them. In recent years, the inorganic material SiO 2 Due to its exce...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01F1/00C04B35/628
Inventor 刘建军喻黎明左胜利于迎春李保山
Owner BEIJING UNIV OF CHEM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap