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Superparamagnetic core-shell composite nanoparticle and preparation method thereof

A composite nanoparticle and superparamagnetic technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of magnetic property change, structural change, instability, etc., and achieve the effect of simple process and mild reaction conditions

Inactive Publication Date: 2009-11-04
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] ②Because of instability, it is prone to structural changes, which will lead to changes in magnetic properties and rapid biodegradation when directly exposed to biological systems
When it is applied in the fields of drug carriers, strong magnetic responsiveness is a prerequisite for realizing its functions such as drug magnetic guidance. In a series of ferrite magnetic nanomaterials MFe 2 o 4 (M=Fe, Mn, Co, Ni, etc.), the most superior magnetic response performance is MnFe 2 o 4 Magnetic nanoparticles, however the inner core is MnFe 2 o 4 Core-shell composite nanomaterials have not been reported so far

Method used

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  • Superparamagnetic core-shell composite nanoparticle and preparation method thereof
  • Superparamagnetic core-shell composite nanoparticle and preparation method thereof
  • Superparamagnetic core-shell composite nanoparticle and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1), weigh 1.0g of MnFe with an average particle size of 30nm 2 o 4 The particles were dispersed in 50 g of deionized water, 5 ml of 25 wt % tetramethylammonium hydroxide solution was added dropwise under stirring, and then ultrasonically dispersed for 30 min to form a stable suspension.

[0032] (2) Take 0.5ml of the above suspension and disperse it in a mixed solution of 5ml of water and 50ml of absolute ethanol, transfer it to a three-necked flask, and stir for 10min.

[0033] (3) Add 5ml of 25wt% ammonia water into the three-necked bottle, and stir to make it evenly mixed.

[0034] (4) Mix 0.25ml tetraethyl orthosilicate and 50ml absolute ethanol evenly, place it in a dropping funnel, and add it dropwise into a three-necked flask, and the reaction process is accompanied by stirring.

[0035] (5) Aging at room temperature for 20 h after completion of the dropwise addition to complete the reaction.

[0036] (6), isolate the product, wash and filter, and dry to obta...

Embodiment 2

[0038] (1), weigh 1.5g of MnFe with an average particle size of 30nm 2 o 4 The particles were dispersed in 50 g of deionized water, 5 ml of 25 wt % tetramethylammonium hydroxide solution was added dropwise under stirring, and then ultrasonically dispersed for 30 min to form a stable suspension.

[0039] (2) Take 1.0ml of the above suspension and disperse it in a mixed solution of 4ml of water and 50ml of absolute ethanol, transfer it to a three-neck flask, and stir for 10min.

[0040] (3) Add 6ml of 25wt% ammonia water into the three-necked bottle, and stir to make it evenly mixed.

[0041] (4) Mix 0.5ml tetraethyl orthosilicate and 50ml absolute ethanol evenly, place it in a dropping funnel, and add it dropwise into a three-necked flask, and the reaction process is accompanied by stirring.

[0042] (5) Aging at room temperature for 24 hours after completion of the dropwise addition to complete the reaction.

[0043] (6), with embodiment 1.

[0044] figure 1 It is the X-r...

Embodiment 3

[0048] (1), weigh 1.5g of MnFe with an average particle size of 30nm 2 o 4 The particles were dispersed in 50 g of deionized water, 5 ml of 25 wt % tetramethylammonium hydroxide solution was added dropwise under stirring, and then ultrasonically dispersed for 30 min to form a stable suspension.

[0049] (2) Take 1.0ml of the above suspension and disperse it in a mixed solution of 4ml of water and 50ml of absolute ethanol, transfer it to a three-neck flask, and stir for 10min.

[0050] (3) Add 6ml of 25wt% ammonia water into the three-necked bottle, and stir to make it evenly mixed.

[0051] (4) Mix 2ml of tetraethyl orthosilicate and 50ml of absolute ethanol evenly, place it in a dropping funnel, and add it dropwise into a three-necked flask, and the reaction process is accompanied by stirring.

[0052] (5), (6), with embodiment 1.

[0053] Figure 6 It is the TEM topography of the composite particles prepared under the process conditions of this example. It can be seen f...

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Abstract

The invention relates to magnetic nano materials and provides a superparamagnetic core-shell composite nanoparticle with an inner core being a magnetic MnFe2O4 nanoparticle and a preparation method thereof. The superparamagnetic core-shell composite nanoparticle is of spherical shape and comprises an inner core and a crust; the inner core is the magnetic MnFe2O4 nanoparticle and the crust is a silicon dioxide clad. The preparation method comprises the following steps: dispersing the MnFe2O4 particles in water, stirring the particles, adding tetramethyl ammonium hydroxide solution and carrying out ultrasonic dispersion to form stable suspension; dispersing the suspension in ethanol and stirring the ethanol to obtain solution A; adding ammonia in the solution A and stirring the solution A to obtain solution B; mixing ethyl orthosilicate and absolute ethyl alcohol and adding the solution B to the mixture, separating the product after aging the mixture, washing, filtering and drying the product, thus obtaining the superparamagnetic core-shell composite nanoparticle.

Description

technical field [0001] The invention relates to a magnetic nano material, in particular to a superparamagnetic core-shell composite nano particle and a preparation method thereof. Background technique [0002] As an important nanomaterial, magnetic nanomaterials not only have the mesoscopic properties of nanomaterials (that is, between macroscopic and microscopic molecules and atoms) in terms of physics and chemistry, but also have their special magnetic capabilities - mesoscopic magnetism , manifested as quantum size effect, superparamagnetism, macroscopic quantum tunneling effect, small size effect of magnetically ordered particles, specific apparent magnetism, etc., making it widely used in information technology, biomedicine and other fields. For example, magnetic resonance imaging, magnetic separation of oligonucleotides, cells, and other biological components, and magnetically guided site-specific drug delivery systems, etc. (1.Z.Li, L.Wei, M.Y.Gao, H.Lei, Adv. Mater....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/00B22F1/02B22F9/00
Inventor 王周成梁汉锋钟和平
Owner XIAMEN UNIV
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