Preparation method for Fe3O4/SiO2 nanometer particle containing multiple magnetism cores

A nanoparticle, fe3o4 technology, applied in nanotechnology, nanomagnetism, nanotechnology, etc., can solve the problems of weak response to external magnetic field and small number of magnetic cores, and achieve easy operation, uniform particle size and excellent magnetic performance. Effect

Inactive Publication Date: 2012-08-01
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current Stober method synthesizes Fe 3 o 4 / SiO 2 There are also a series of problems in magnetic composite particles, the main problem is that the number of magnetic cores contained in the prepared composite particles is small, and the external magnetic field response ability is weak.

Method used

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  • Preparation method for Fe3O4/SiO2 nanometer particle containing multiple magnetism cores
  • Preparation method for Fe3O4/SiO2 nanometer particle containing multiple magnetism cores
  • Preparation method for Fe3O4/SiO2 nanometer particle containing multiple magnetism cores

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Prepare the spinning solution according to the following steps: 0.2g Fe 3 o 4 , 0.2g CTAB and 1.0mL TEOS were dissolved in an Erlenmeyer flask filled with 10mL isopropanol at room temperature; then ultrasonically treated for 15min; then 1.0g PVP K90 fine powder was added to it, and a uniform brown spinning was obtained after magnetic stirring for 24 hours. silk liquid. After the solution is prepared, a certain amount of PVP spinning liquid is extracted with a syringe, fixed on the electrospinning device, and various spinning parameters are adjusted for electrospinning.

[0032] The nanofibers obtained by electrospinning were peeled off from the aluminum foil, put into a 250ml three-necked flask, and then an aqueous ethanol solution (PH=9.0) with an ethanol volume concentration of 80% was added to it and heated at 40°C. , vigorously stirred (100r / min) for 24h, that is, Fe containing multiple magnetic cores 3 o 4 / SiO 2 nanoparticles.

[0033] The electrospun nanofib...

Embodiment 2

[0035] Prepare the spinning solution according to the following steps: 0.10g Fe 3 o 4 , 0.2g CTAB and 0.8mL TEOS were dissolved in an Erlenmeyer flask filled with 10mL isopropanol at room temperature; then ultrasonically treated for 20min; silk liquid. After the solution is prepared, a certain amount of PVP spinning liquid is extracted with a syringe, fixed on the electrospinning device, and various spinning parameters are adjusted for electrospinning.

[0036] During electrospinning, the size of the syringe is 5mL, the inner diameter of the needle is about 1mm, and the receiving screen is grounded with aluminum foil; the ejection flow rate is 2-3.5mL / h, the voltage is 10-13kv, and the distance between the needle and the receiving screen is 15-18cm.

[0037] The nanofibers obtained by electrospinning were peeled off from the aluminum foil, put into a 250ml three-necked flask, and then an aqueous ethanol solution (PH=8.0) with an ethanol volume concentration of 80% was added ...

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Abstract

The invention relates to a preparation method for a Fe3O4/SiO2 nanometer particle containing multiple magnetism cores, which comprises (1) dissolving Fe3O4, cetyltrimethyl ammonium (CTAB) and tetraethyl orthosilicate (TEOS) in solvent, obtaining mixed solution after ultrasonic processing, then adding polyvinylpyrrolidone powder, and evenly stirring to achieve spinning solution; (2) using the spinning osolution to perform electrostatic spinning to obtain nanometer fiber; and (3) placing the nanometer fiber in ethanol water, and forcefully stirring at the temperature of 20 DEG C to 40 DEG C to achieve the Fe3O4/SiO2 nanometer particle containing the multiple magnetism core. The preparation method is convenient in operation, moderate in reaction condition, low in cost of raw materials, easy in obtaining the raw materials, free of poison and pollution and good in biocompatibility. The Fe3O4/SiO2 nanometer particle contains multiple magnetism cores, has excellent magnetic property, is uniform in particle diameter, regular in shape, high in chemical stability and has the advantages of a general nanometer particle.

Description

technical field [0001] The invention belongs to Fe 3 o 4 The field of preparation of composite particles, in particular to a Fe containing multiple magnetic cores 3 o 4 / SiO 2 Preparation method of nanoparticles. Background technique [0002] Magnetic nanoparticles (such as Fe 3 o 4 , γ-Fe 2 o 3 , Co, Ni and other nanoparticles) not only have high specific surface area characteristics, but also have superior magnetic properties (such as superparamagnetism, etc.), so they are of great value in basic research and practical applications. 3 o 4 Nanoparticles are often used to prepare magnetic polymer microspheres due to their low toxicity and high magnetic saturation strength and are widely used in biomedical fields (targeted drug carrier, immobilized enzyme, cell separation, nuclear magnetic resonance, immunoassay). and purification of biomolecules, etc.) and has broad application prospects. However, due to size effects, magnetic dipole attraction, etc., these magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/36B82Y40/00B82Y25/00
Inventor 朱利民张培培聂华丽田利强
Owner DONGHUA UNIV
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