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A fluorescent magnetic nanocomposite material and its preparation method

A technology of magnetic nano and composite materials, applied in the field of nano materials, can solve the problems of biological toxicity limiting the application and development of semiconductor quantum dots, etc., and achieve the effect of simple method, good biocompatibility and simple method

Active Publication Date: 2016-10-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, quantum dots such as CdSe and CdTe, which are more researched, use toxic heavy metal elements, and the potential biological toxicity limits the application and development of these semiconductor quantum dots.

Method used

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  • A fluorescent magnetic nanocomposite material and its preparation method
  • A fluorescent magnetic nanocomposite material and its preparation method
  • A fluorescent magnetic nanocomposite material and its preparation method

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Embodiment 1

[0033] a kind of like figure 2 , image 3 , Figure 4 The fluorescent magnetic nanocomposite material of the present invention shown, it is mainly made of positively charged magnetic Fe 3 o 4 - Chitosan nanoparticles and negatively charged functionally modified ZnSe-ZnS core-shell quantum dots are prepared by layer-by-layer electrostatic self-assembly method. Functionally modified ZnSe-ZnS core-shell quantum dots are modified by mercapto carboxylic acid compounds ZnSe-ZnS core-shell quantum dots, and the ZnSe-ZnS core-shell quantum dots are prepared with ZnSe as the core and ZnS as the shell coating (see figure 2 ).

[0034] The preparation method of the fluorescent magnetic nanocomposite material of the present embodiment comprises the following steps (see figure 1 ):

[0035] 1.1 Dissolve 2.502g of ferrous sulfate heptahydrate in 30mL of deionized water, add 10mL of -1 PEG-20000 aqueous solution, fully stirred in a 30°C constant temperature water bath, dropwise adde...

Embodiment 2

[0043] A fluorescent magnetic nanocomposite material of the present invention, which is mainly composed of positively charged magnetic Fe 3 o 4 - Chitosan nanoparticles and negatively charged functionally modified ZnSe-ZnS core-shell quantum dots are prepared by layer-by-layer electrostatic self-assembly method. Functionally modified ZnSe-ZnS core-shell quantum dots are modified by mercapto carboxylic acid compounds ZnSe-ZnS core-shell quantum dots, and the ZnSe-ZnS core-shell quantum dots are prepared with ZnSe as the core and ZnS as the shell coating.

[0044] The preparation method of the fluorescent magnetic nanocomposite material of the present embodiment comprises the following steps (see figure 1 ):

[0045] 1.1 Dissolve 2.502g of ferrous sulfate heptahydrate in 30mL of deionized water, add 10mL of -1 PEG-20000 aqueous solution, fully stirred in a 30°C constant temperature water bath, dropwise added a certain amount of dilute ammonia solution 30mL, until the pH of th...

Embodiment 3

[0053] A fluorescent magnetic nanocomposite material of the present invention, which is mainly composed of positively charged magnetic Fe 3 o 4 - Chitosan nanoparticles and negatively charged functionally modified ZnSe-ZnS core-shell quantum dots are prepared by layer-by-layer electrostatic self-assembly method. Functionally modified ZnSe-ZnS core-shell quantum dots are modified by mercapto carboxylic acid compounds ZnSe-ZnS core-shell quantum dots, and the ZnSe-ZnS core-shell quantum dots are prepared with ZnSe as the core and ZnS as the shell coating.

[0054] The preparation method of the fluorescent magnetic nanocomposite material of the present embodiment comprises the following steps (see figure 1 ):

[0055] 1.1 Dissolve 2.528g of ferrous sulfate heptahydrate in 30mL of deionized water, add 10mL of -1 PEG-20000 aqueous solution, fully stirred in a 30°C constant temperature water bath, dropwise added a certain amount of dilute ammonia solution 30mL, until the pH of th...

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Abstract

The invention discloses a fluorescent magnetic nano composite material. The fluorescent magnetic nano composite material is mainly prepared from magnetic Fe3O4-chitosan nanoparticles with positive charges and a ZnSe-ZnS core / shell quantum dot with negative charges through a layer-by-layer electrostatic self-assembly method, wherein the ZnSe-ZnS core / shell quantum dot is prepared by coating with ZnSe as an inner core and ZnS as a housing. A preparation method for the fluorescent magnetic nano composite material comprises the following steps: preparing magnetic Fe3O4-chitosan nanoparticles and preparing a solution; preparing the functional modified ZnSe-ZnS core / shell quantum dot and preparing a quantum dot solution; weighing the quantum dot solution and dropwise adding the quantum dot solution into the Fe3O4-chitosan nanoparticle solution to perform self-assembly; then, stirring, staying overnight, precipitating, filtering, washing and drying to obtain the fluorescent magnetic nano composite material. The product disclosed by the invention can realize magnetic separation, targeted identification, fluorescence imaging and magnetic resonance imaging, and is low in cost and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a fluorescent magnetic nanocomposite material and a preparation method thereof. Background technique [0002] Since the 1980s, nanomaterials, as a new material, have gradually become the focus of research and development in countries all over the world, and have been widely used in information storage, catalysis, light absorption, medicine, luminescence and other fields. Quantum dots are a new type of fluorescent nanoparticles developed in recent years. Compared with traditional organic fluorescent dyes, quantum dots have a wide range of excitation spectrum and continuous distribution; by changing the particle size and composition of quantum dots, different colors can be emitted. Fluorescence, which makes multi-component detection of biomolecules easier; the fluorescence spectrum of quantum dots is narrow and symmetrical, thereby reducing the interference ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88C09K11/02B82Y30/00B82Y20/00B82Y25/00
Inventor 丁萍杨飞李桂银周治德陈翠梅李晶黄瑞雪
Owner CENT SOUTH UNIV
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