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Preparation method of difunctional magnetic fluorescent nanocomposite Fe3O4@CDs microspheres

A fluorescent nano and dual-functional technology, applied in the direction of magnetic materials, magnetic objects, nanotechnology, etc., can solve the problems of low chemical stability, potential toxicity, and narrow suitable range of quantum dots, and achieve less restrictions on reaction conditions and stability Good performance and good water solubility

Pending Publication Date: 2020-02-11
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yang et al. used the Stober method in Fe 3 o 4 SiO 2 Layer gets Fe 3 o 4 @SiO 2 Nanoparticles, and then use it as a template, and use a sol-gel method to coat a layer doped with 5% Eu on the surface 3+ LaVO 4 Synthetic Nanoparticle Fe 3 o 4 @SiO 2 @LaVO 4 :Eu 3+ , but the process of hydrolysis and polycondensation of the reactant, growth and agglomeration to form a gel is relatively slow, and the gel needs to be dried and roasted to remove organic components in the later stage. The process is cumbersome, the synthesis cycle is long, and the cost is high
Wang et al. combined hydrothermal method and layer-by-layer assembly method to prepare Fe 3 o 4 @C@CdTe nanocomposite particles as chemical sensors for Cu 2+ The detection process is relatively cumbersome, and the suitable range is relatively narrow
[0004] Quantum dots have low chemical stability and potential toxicity, which limits their application

Method used

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  • Preparation method of difunctional magnetic fluorescent nanocomposite Fe3O4@CDs microspheres
  • Preparation method of difunctional magnetic fluorescent nanocomposite Fe3O4@CDs microspheres
  • Preparation method of difunctional magnetic fluorescent nanocomposite Fe3O4@CDs microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Fe 3 o 4 Preparation of:

[0025] Weigh 0.2g of ferric chloride hexahydrate (FeCl 3 ﹒ 6H 2 O), add 15mL deionized water to dissolve, then add 0.5g citric acid monohydrate, 3mL ethylenediamine, 0.3g sodium hydroxide. After stirring evenly, transfer to a 50mL reactor and react at 200°C for 12h. The black solution was magnetically separated and washed several times with ethanol and deionized water to remove residual reactants, and dried in vacuum at 60°C for 6 hours.

[0026] 2. Fe 3 o 4 @SiO 2 -NH 2 Preparation of:

[0027] 0.1g Fe 3 o 4 Disperse in 100mL ethanol solution (ethanol / water = 1 / 4, V; V), add 1.5mL ammonia water, ultrasonic 15min, make it evenly dispersed in the solution, then slowly add 1mL tetraethyl orthosilicate under mechanical stirring, After reacting for 45min, 0.07mL of 2-(aminoethyl)propyltrimethylsilane was added dropwise, stirring was continued for 4h at room temperature, and the synthesized Fe 3 o 4 @SiO 2 -NH 2 After the nanopa...

Embodiment 2

[0032] 1. Fe 3 o 4 Preparation of:

[0033] Weigh 0.3g of ferric chloride hexahydrate (FeCl 3 ﹒ 6H 2 O), add 10mL deionized water to dissolve, then add 0.6g citric acid monohydrate, 2mL ethylenediamine, 0.4g sodium hydroxide. After stirring evenly, transfer to a 50mL reactor and react at 200°C for 8h. The black solution was magnetically separated and washed several times with ethanol and deionized water to remove residual reactants, and dried in vacuum at 60°C for 6 hours.

[0034] 2. Fe 3 o 4 @SiO 2 -NH 2 Preparation of:

[0035] 0.1gFe 3 o 4 Disperse in 100mL ethanol solution (ethanol / water=10 / 3, V; V), add 1.5mL ammonia water, ultrasonic 15-30min to make it evenly dispersed in the solution, then slowly add 1mL ethyl orthosilicate under mechanical stirring After reacting for 45-60min, add 0.07mL of 2-(aminoethyl)propyltrimethylsilane dropwise, and continue stirring at room temperature for 4-6h, and the synthesized Fe 3 o 4 @SiO 2 -NH 2 After the nanoparticle...

Embodiment 3

[0040] 1. Fe 3 o 4 Preparation of:

[0041] Weigh 0.2g of ferric chloride hexahydrate (FeCl 3 ﹒ 6H 2 O), add 15mL deionized water to dissolve, then add 0.5g citric acid monohydrate, 3mL ethylenediamine, 0.3g sodium hydroxide. After stirring evenly, transfer to a 50mL reactor and react at 200°C for 12h. The black solution was magnetically separated and washed several times with ethanol and deionized water to remove residual reactants, and dried in vacuum at 60°C for 6 hours.

[0042] 2. Fe 3 o 4 @SiO 2 -NH 2 Preparation of:

[0043] 0.16g Fe 3 o 4 Disperse in 130mL ethanol solution (ethanol / water=10 / 3, V; V), add 2mL ammonia water, ultrasonic 30min, make it evenly dispersed in the solution, then slowly add 2mL tetraethyl orthosilicate under mechanical stirring, react After 60min, 0.66mL of 3-aminopropyltriethoxysilane was added dropwise, stirring was continued for 6h at room temperature, and the synthesized Fe 3 o 4 @SiO 2 -NH 2 After the nanoparticles were sep...

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Abstract

The invention discloses a preparation method of difunctional magnetic fluorescent nanocomposite Fe3O4@CDs microspheres. Core-shell nanocomposite Fe3O4@CDs are synthesized from bottom to top, firstly,a silane reagent (2(aminoethyl)propyltrimethylsilane / 3-aminopropyltriethoxysilane) is utilized for modifying and constructing an Fe3O4@SiO2-NH2 core-shell structure, quenching of CDs fluorescence dueto magnetic particles is effectively reduced, and then a magnetic nanocomposite with high fluorescence intensity is prepared from ammonium citrate / citric acid as a carbon source and ethanediamine / triethylene tetramine as a nitrogen source with a one-pot method. The prepared composite is high in magnetic intensity, good in dispersity and excellent in fluorescence properties, and is expected to be widely applied to the fields of environmental governance, targeted therapy, fluorescence labeling and the like.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a dual-functional magnetic fluorescent nanocomposite Fe 3 o 4 Preparation method of @CDs microspheres. Background technique [0002] Magnetic fluorescent dual-functional nanomaterials are fluorescent magnetic composite nanoparticles formed by combining superparamagnetic nanoparticles and quantum dots. This dual-functional biological nanomaterial combines the magnetic properties of magnetic nanoparticles with the fluorescent properties of biomarkers. Combined, it has magnetic responsiveness, fluorescent traceability and surface functionality, and has broad application prospects in many fields such as targeted drug carriers, cell separation and labeling, magnetic resonance imaging, and biosensors. It provides design ideas and directions for developers to develop new materials. [0003] So far, the formation mechanisms of core-shell magnetic fluorescent nanocom...

Claims

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Application Information

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IPC IPC(8): C09K11/65C09K11/02H01F1/00H01F41/00B82Y20/00B82Y30/00
CPCC09K11/65C09K11/02H01F1/0054H01F41/00B82Y20/00B82Y30/00
Inventor 苏小东冉琴刘洁成祝刘恩余邓星徐羽靚徐春丽
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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