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Magnetic fluorescent double-function nanocomposite and preparation method thereof

A nanocomposite material and magnetic nanoparticle technology, applied in the field of nanomaterials, can solve the problems of heavy metal toxicity of biocompatible semiconductor quantum dots, restrict the application of magnetic fluorescent dual-functional materials, poor optical stability, etc., and achieve good optical stability and Biocompatibility, good chemical stability, easy functionalization effect

Inactive Publication Date: 2018-04-20
SILICON LAKE COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current magnetic and fluorescent bifunctional composite materials still have many problems, such as poor optical stability and frequent photobleaching during use, biocompatibility, and heavy metal toxicity in semiconductor quantum dots.
The above problems make it a serious threat when applied to biological systems, thus restricting the application of magnetic fluorescent bifunctional materials in the biological field

Method used

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  • Magnetic fluorescent double-function nanocomposite and preparation method thereof
  • Magnetic fluorescent double-function nanocomposite and preparation method thereof
  • Magnetic fluorescent double-function nanocomposite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 As shown, this embodiment relates to the preparation of a magnetic and fluorescent bifunctional nanocomposite material.

[0037] 1. Preparation of fluorescent carbon quantum dots.

[0038] Weigh 2.1g of citric acid into a beaker, add 50mL of deionized water, place it in an ultrasonic instrument, stir and dissolve the citric acid while ultrasonicating, transfer the evenly mixed solution into a reaction kettle, keep it warm at 180°C for 5h, and after cooling Centrifuge and take the supernatant.

[0039] In order to further purify the carbon quantum dots and remove macromolecular impurities, the supernatant was dialyzed through a dialysis bag with a cutoff of 1000 for 24 hours, and the water was changed every 3 hours to remove unreacted citric acid and other impurities to obtain a pure carbon quantum dot solution.

[0040] 2. Magnetic nanoparticle composite microspheres, comprising the following steps:

[0041] S 1 , to prepare magnetic nanoparticles: ...

Embodiment 2

[0054] This example relates to the preparation of a magnetic and fluorescent bifunctional nanocomposite material.

[0055] 1. Preparation of fluorescent carbon quantum dots.

[0056] Weigh 2.1g of citric acid into a beaker, add 50mL of deionized water, place it in an ultrasonic instrument, stir and dissolve the citric acid while ultrasonicating, transfer the evenly mixed solution to a reaction kettle, keep it at 200°C for 5 hours, and after cooling Centrifuge and take the supernatant.

[0057] In order to further purify the carbon quantum dots and remove macromolecular impurities, the supernatant was dialyzed through a dialysis bag with a cutoff of 1000 for 24 hours, and the water was changed every 3 hours to remove unreacted citric acid and other impurities to obtain a pure carbon quantum dot solution.

[0058] 2. Magnetic nanoparticle composite microspheres, comprising the following steps:

[0059] S 1 , to prepare magnetic nanoparticles:

[0060] Weigh 2.78g of FeSO 4 ...

Embodiment 3

[0068] This example relates to the preparation of a magnetic and fluorescent bifunctional nanocomposite material.

[0069] 1. Preparation of fluorescent carbon quantum dots.

[0070] Weigh 2.1g of citric acid into a beaker, add 50mL of deionized water, place it in an ultrasonic instrument, stir and dissolve the citric acid while ultrasonicating, transfer the evenly mixed solution into a reaction kettle, keep it warm at 180°C for 5h, and after cooling Centrifuge and take the supernatant.

[0071] In order to further purify the carbon quantum dots and remove macromolecular impurities, the supernatant was dialyzed through a dialysis bag with a cutoff of 1000 for 24 hours, and the water was changed every 3 hours to remove unreacted citric acid and other impurities to obtain a pure carbon quantum dot solution.

[0072] 2. Magnetic nanoparticle composite microspheres, comprising the following steps:

[0073] S 1 , to prepare magnetic nanoparticles:

[0074] Weigh 2.78g of FeSO ...

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Abstract

The invention relates to a magnetic fluorescent double-function nanocomposite in the technical field of nano materials. The nanocomposite comprises a fluorescent carbon quantum dots of which the surface modification is provided with carboxyl groups, and magnetic nano composite microspheres which comprise Fe3O4 magnetic nano particles and SiO2 embedding layers, wherein the surface modification of the magnetic nano composite microspheres is provided with amino groups; and the carboxyl groups on the surfaces of the fluorescent carbon quantum dots are in chemical coupling connection with the aminogroups on the surfaces of the magnetic nano composite microspheres. According to the invention, connecting agents EDC (1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride) and NHS (N-hydroxysuccinimide) are adopted, the magnetic nano particles are connected with the fluorescent carbon quantum dots through forming chemical bonds, the chemical stability is good, and meanwhile the magnetic fluorescent double-function nanocomposite has the advantages of good water solubility, low toxicity, good biocompatibility and the like.

Description

technical field [0001] The invention relates to a technology in the field of nanomaterials, in particular to a magnetic and fluorescent dual-functional nanocomposite material and a preparation method thereof. Background technique [0002] Materials with a single function are inevitably subject to some application restrictions and cannot meet the increasingly complex production and living needs of modern society. Multifunctional composite materials are popular because they combine the advantages of multiple single-functional materials. Among them, magnetic and fluorescent bifunctional composite materials have great application potential in the biological field due to their relatively stable chemical properties and good biocompatibility. [0003] However, the current magnetic fluorescent bifunctional composites still have many problems, such as poor optical stability and frequent photobleaching during use, biocompatibility, and heavy metal toxicity in semiconductor quantum dot...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/65C09K11/60B82Y30/00B82Y40/00H01F1/01H01F41/00
CPCB82Y30/00B82Y40/00C09K11/02C09K11/025C09K11/60C09K11/65H01F1/01H01F41/00
Inventor 刘勇健庄虹王胜男
Owner SILICON LAKE COLLEGE
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