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Carbon quantum dot magnetic and fluorescent difunctional nano material and preparation method thereof

A technology of carbon quantum dots and nanomaterials, applied in the field of material preparation, can solve the problems of non-adjustable fluorescence intensity, limited application of magnetic fluorescent nanomaterials, poor stability, etc., and achieve good biocompatibility, biocompatibility and degradation Good performance and improved stability

Active Publication Date: 2014-01-22
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of magnetic fluorescent nanomaterials in the field of biomedicine due to the poor biocompatibility and stability of the magnetic carbon quantum dots / chitosan composite microspheres made in the prior art and the non-adjustable magnetic and fluorescent intensity. For the problem of limited application, provide a carbon quantum dot magnetic fluorescent dual-functional nanomaterial and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Carbon quantum dot magnetic fluorescence bifunctional nanomaterial and preparation method thereof, the specific steps are as follows:

[0035] 1) Magnetic fluid nano Fe 3 o 4 Synthesis

[0036] Using coprecipitation method, weigh 1.3g FeCl 3 ·6H 2 O, 0.5g FeSO 4 4H 2 O, dissolved in deionized water pre-degassed with nitrogen, passed through N 2 Protected, heated to 69°C, then stirred rapidly, and slowly added 6mL of ammonia water. After reacting for 1 h, the resulting precipitate was separated from the reaction medium by an external magnetic field, and washed three times with secondary water to obtain nano-Fe 3 o 4 Suspension, ultrasonic 20min, the obtained black solution is nano-Fe 3 o 4 ferrofluid.

[0037] 2) Preparation of carbon quantum dots

[0038] 2 g of citric acid and 2 g of urea were added to 13 mL of distilled water to form a clear solution. Heated in a microwave oven for 40 min until the solution changed from colorless to dark brown clustered s...

Embodiment 2

[0044] Carbon quantum dot magnetic fluorescence bifunctional nanomaterial and preparation method thereof, the specific steps are as follows:

[0045] 1) Magnetic fluid nano Fe 3 o 4 Synthesis

[0046] Using coprecipitation method, weigh 1.4g FeCl 3 ·6H 2 O, 0.5g FeSO 4 4H 2 O, dissolved in deionized water pre-degassed with nitrogen, passed through N 2 Protected, heated to 70°C, then stirred rapidly and slowly added 6ml of ammonia water. After reacting for 1.5 h, the resulting precipitate was separated from the reaction medium by an external magnetic field, and washed three times with secondary water to obtain nano-Fe 3 o 4 Suspension, ultrasonic 25min, the obtained black solution is nano-Fe 3 o 4 ferrofluid.

[0047] 2) Preparation of carbon quantum dots

[0048] 1.5g of citric acid and 1.5g of urea were added to 10mL of distilled water to form a clear solution. Heated in a microwave oven for 45 min until the solution changed from colorless to dark brown clustered...

Embodiment 3

[0054] Carbon quantum dot magnetic fluorescence bifunctional nanomaterial and preparation method thereof, the specific steps are as follows:

[0055] 1) Magnetic fluid nano Fe 3 o 4 Synthesis

[0056] Using coprecipitation method, weigh 1.4g FeCl 3 ·6H 2 O, 0.5g FeSO 4 4H 2 O, dissolved in deionized water pre-degassed with nitrogen, passed through N 2 Protected, heated to 70°C, then stirred rapidly and slowly added 6ml of ammonia water. After reacting for 1.5 h, the resulting precipitate was separated from the reaction medium by an external magnetic field, and washed three times with secondary water to obtain nano-Fe 3 o 4 Suspension, ultrasonic 25min, the obtained black solution is nano-Fe 3 o 4 ferrofluid.

[0057] 2) Preparation of carbon quantum dots

[0058] Add 3 g of citric acid and 3 g of urea to 10 mL of distilled water to form a clear solution. Heated in a microwave oven for 45 min until the solution changed from colorless to dark brown clustered solid. ...

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Abstract

The invention relates to a multifunctional nano composite material in a core-shell structure, specifically relates to a carbon quantum dot magnetic and fluorescent difunctional nano material and a preparation method thereof, and belongs to the field of preparation of materials. The carbon quantum dot magnetic and fluorescent difunctional nano material which takes magnetic particles Fe3O4 as a core, chitosan and polyanionic cellulose as a shell material and carbon quantum dots as a fluorescent material is obtained by a self-assembling method layer by layer. The preparation method comprises the following steps: after synthesizing a magnetic fluid nano Fe3O4, preparing carbon quantum dots; then, preparing Fe3O4@CS / CDs; finally, preparing the carbon quantum dot magnetic and fluorescent difunctional nano material through the self-assembling method layer by layer. The carbon quantum dot magnetic and fluorescent difunctional nano material is good in biocompatibility and stability and adjustable in magnetism and fluorescence intensity.

Description

technical field [0001] The invention relates to a multifunctional nanocomposite material with a core-shell structure, in particular to a carbon quantum dot magnetic fluorescent bifunctional nanomaterial and a preparation method thereof, belonging to the field of material preparation. Background technique [0002] Due to their magnetic responsiveness and fluorescent traceability, magnetic fluorescent composite materials have a wide range of important application values ​​in the field of biomedicine, such as bioseparation, nanomedicine applications, biological and chemical sensing, etc. It is worth mentioning that magnetic fluorescent composites are an important tool for in vivo imaging, which can be monitored by magnetic resonance imaging and can also be imaged by fluorescence optics. [0003] Although researchers have conducted extensive studies on magnetic-fluorescent bifunctional biomaterials, there are still some problems, such as poor biocompatibility, poor biodegradabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65H01F1/42B82Y30/00B82Y40/00B82Y20/00B82Y25/00
Inventor 王飞俊李佳高可政邵自强张仁旭王文俊李永红
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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