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Preparation method of nuclear/hull type functional nano micro-ball using silicon dioxide as hull

A silicon dioxide and functional nanotechnology, which is applied in the field of preparation of nanomaterials technology, can solve the problems of complex operation and uneven particle size of nano-microspheres, and achieve the effects of clear structure, good magnetism and simple preparation method.

Inactive Publication Date: 2007-09-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can obtain SiO with magnetic and fluorescent properties 2 , but this method requires complex operations, and the particle size of the obtained nanospheres is not uniform

Method used

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  • Preparation method of nuclear/hull type functional nano micro-ball using silicon dioxide as hull

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 0.0025molFe 3 o 4 The nanoparticles were dispersed in 2.5ml ammonia water with a molar concentration of 0.001mol / L; at the same time, the surfactant aerosol OT was dissolved in cyclohexane to obtain a solution with a concentration of 0.2mol / L. Mix 2.5ml of the former solution with 125ml of the latter solution, disperse by ultrasonic for 30 minutes, add 2.5ml of tetraethyl orthosilicate, stir at room temperature for 24 hours, then use centrifugal washing method to clean the obtained product, repeat 5 times, and Dry to obtain gray-black powder

[0020] The gray-black powder obtained can be determined to be a composite of ferric oxide particles with an inverse spinel structure and amorphous silicon dioxide by X-ray diffraction (XRD).

[0021] Observing the prepared particles with a transmission electron microscope, the prepared particles have a core-shell structure, as shown in Figure 1, wherein the outer layer is silicon dioxide, and the core is a magnetic ferric oxide ...

Embodiment 2

[0024] 0.0025molFe 3 o 4 Nanoparticles were dispersed in 2.5ml of ammonia water with a molar concentration of 8mol / L; at the same time, the surfactant Igepal CO-520 was dissolved in cyclohexane to obtain a solution with a concentration of 0.2mol / L. Mix 2.5ml of the former solution with 250ml of the latter solution. After ultrasonic dispersion for 30 minutes, add 1.25ml of tetraethyl orthosilicate, stir at room temperature for 20 hours, and then use centrifugal washing to clean the obtained product. Repeat 5 times, and Dry to obtain gray-black powder

[0025] The gray-black powder obtained can be determined to be a composite of ferric oxide particles with an inverse spinel structure and amorphous silicon dioxide by X-ray diffraction (XRD).

[0026] Observing the prepared particles with a transmission electron microscope, the prepared particles have a core-shell structure, the outer layer is silicon dioxide, and the core is a magnetic ferric oxide cluster; the total diameter o...

Embodiment 3

[0029] 0.005molFe 3 o 4 The nanoparticles were dispersed in 2.5ml of ammonia water with a molar concentration of 8mol / L; meanwhile, the surfactant Igepal CO-520 was dissolved in cyclohexane to obtain a solution with a concentration of 0.4mol / L. Mix 2.5ml of the former solution with 125ml of the latter solution, disperse by ultrasonic for 30 minutes, add 0.75ml of tetraethyl orthosilicate, stir at room temperature for 20 hours, then use centrifugal washing method to clean the obtained product, repeat 5 times, and Dry to obtain gray-black powder

[0030] The gray-black powder obtained can be determined to be a composite of ferric oxide particles with an inverse spinel structure and amorphous silicon dioxide by X-ray diffraction (XRD).

[0031] Observing the prepared particles with a transmission electron microscope, the prepared particles have a core-shell structure, the outer layer is silicon dioxide, and the core is a magnetic ferric oxide cluster; the total diameter of the ...

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Abstract

A preparation method of nanospheres with core-shell structure having a shell of silicon dioxide belongs to the nanometer material technology field and comprises the steps of: (1)dispersing magnetic particle or aggregate of magnetic particle and quantum dot particle into alkaline water solution; (2) solving the surface active agent into non-polar solvent; (3)mixing the solution obtained from step (1) with the solution obtained from step (2) with a volume ratio of 1:1000-1:1, and obtaining emulsion or microemulsion by ultrasound or vortex mixing method; (4)adding tetraethoxysilane into emulsion or microemulsion and agitating, wherein, the volume of tetraethoxysilane occupies 0.1~10% of the emulsion volume; (5)centrifuge washing and drying. The nanosphere of the present invention has magnetic response property, or has magnetic response property and photoluminescent property synchronously, and has uniform grain size, besides the preparation method is simple.

Description

technical field [0001] The invention relates to a preparation method in the technical field of nanomaterials, in particular to a preparation method of core / shell functional nano microspheres with silicon dioxide as the shell. Background technique [0002] Functional microspheres are a class of microspheres with various functions such as fluorescence, magnetism, and environmental responsiveness. In recent years, due to the broad prospects of functional microspheres in practical applications, research on magnetic and fluorescent nanoparticles The research on the preparation method and properties has received great attention. A method of wrapping functional nanoparticles with inorganic materials, or adsorbing functional nanoparticles to the surface of inorganic materials. The inorganic material is mainly silica, because silica is a biologically inert material, and its surface is conducive to the modification of other functional groups, so it has great application prospects in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113
Inventor 孙康窦红静陶可
Owner SHANGHAI JIAO TONG UNIV
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