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Preparation method of porous magnetic fluorescent nanosphere

A technology of fluorescent nanometers and nanospheres, which is applied in the field of materials, can solve problems such as difficulty in finding pores, and achieve the effect of increasing surface area and easy adsorption

Inactive Publication Date: 2010-10-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these methods, the surface of magnetic polystyrene nanospheres is close to smooth, and it is difficult to find holes under the electron microscope.

Method used

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  • Preparation method of porous magnetic fluorescent nanosphere
  • Preparation method of porous magnetic fluorescent nanosphere
  • Preparation method of porous magnetic fluorescent nanosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing porous magnetic fluorescent nanospheres, comprising the steps of:

[0029] Fe was first synthesized by thermal decomposition of iron oleate at a high temperature of 320°C 3 o 4 magnetic nanoparticles, the as-synthesized Fe 3 o 4 The particles were then dried at 40°C.

[0030] Accurately weigh the dry powder of ethyl cellulose (EC), dissolve it in ethanol to obtain an ethanol solution with an EC mass concentration of 5 mg / ml. The solution was divided into 2 equal parts, and the Fe concentration of 0.65 and 1.95 mg / ml was added to 3 o 4 nanoparticles, and then adopt the method of ultrasonic atomization drying, the EC-Fe 3 o 4 The ethanol solution was atomized into droplets, and then the droplets were dried at a drying temperature of 60°C to make porous magnetic ethylcellulose nanospheres.

[0031] Accurately weighed porous magnetic ethylcellulose nanospheres (EC-Fe 3 o 4 ) dry powder, dispersed in the quantum dot CdTe aqueous solution, the...

Embodiment 2

[0036] Ethanol solutions with ethyl cellulose concentrations of 1 mg / ml and 10 mg / ml were prepared respectively.

[0037] Add Fe to a 1 mg / ml ethylcellulose solution in ethanol 3 o 4 Nanoparticles that make Fe 3 o 4 The concentration of nanoparticles reaches 0.2mg / ml;

[0038] Add Fe to a 10 mg / ml ethylcellulose solution in ethanol 3 o 4 Nanoparticles that make Fe 3 o 4 The concentration of nanoparticles reaches 4mg / ml.

[0039] Each solution is divided into 2 parts (that is, 4 samples), and then atomized by ultrasonic waves, and the droplets are dried, and the drying temperature of each solution is 35°C and 95°C, respectively.

[0040] The results showed that the obtained porous magnetic ethylcellulose nanospheres (EC-Fe 3 o 4 ) nanospheres all contain holes, and the number and size of holes increase slightly when the temperature rises. But by changing Fe in Example 1 3 o 4 Compared with the amount of nanoparticles to control the morphology of pores, the effect o...

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Abstract

The invention provides a preparation method of a porous magnetic nanosphere and a method for loading fluorescent quantum dots. The method comprises the following steps of: adding magnetic Fe3O4 nano particles into an alcohol solution of ethylcellulose to obtain an ethylcellulose nanosphere embedded with magnetic particles by utilizing an ultrasonic atomizing and drying technology, and then regulating and controlling the quantity and the size of pores in the nanosphere by regulating the quantity of the Fe3O4 nano particles. Due to the existence of multiple pores, the nanosphere has a large specific surface area and can conveniently combine with a considerable quantity of quantum dots through static adsorption. The porous magnetic nanosphere obtained in the invention and the porous magneticnanosphere adsorbing the quantum dots have application prospects in biomedicine.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a method for preparing porous magnetic fluorescent nanospheres, in particular to a method for preparing porous ethylcellulose magnetic nanospheres adsorbed with quantum dots. Background technique [0002] When a nanoparticle is both magnetic and fluorescent, this nanoparticle plays an important role in biomedicine, such as magnetic resonance imaging, fluorescence imaging, hyperthermia, photodynamic therapy, etc. Combining fluorescent quantum dots with superparamagnetic Fe 3 o 4 Compounding nanoparticles is a common method for preparing composite particles with both magnetic and fluorescent properties. This is because quantum dots have very superior fluorescent properties, such as stable fluorescence, high quantum yield, wide excitation spectrum, and fluorescence emission spectrum. Narrow, etc.; Fe 3 o 4 Nanoparticles have the characteristics of good biological safety, very little toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88
Inventor 谢永生储茂泉吴庆生
Owner TONGJI UNIV
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