Magnetic fluorescent composite material, its preparation method and application

A composite material and fluorescence technology, applied in biochemical equipment and methods, analytical materials, instruments, etc., can solve problems such as doubts about feasibility, reduction of fluorescence brightness of composite materials, and inability to solve problems

Active Publication Date: 2007-04-18
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above first and second methods fundamentally cannot solve the problem that the magnetic iron oxide material in the magnetic and fluorescent composite materials reduces the fluorescent brightness of the composite material due to absorption
In addition, the feasibility of dispersing water-soluble quantum dots and magnetic nanocrystals synthesized in water phase in the chloroform/n-butanol

Method used

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  • Magnetic fluorescent composite material, its preparation method and application
  • Magnetic fluorescent composite material, its preparation method and application
  • Magnetic fluorescent composite material, its preparation method and application

Examples

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preparation example Construction

[0056] The preparation steps of the magnetic fluorescent composite microspheres involved in the present invention are as follows:

[0057] The preparation process mainly includes four steps, the first three steps are the same as the preparation steps of the magnetic fluorescent composite material, and the fourth step is as follows:

[0058] The reactive surfactant (as an emulsifier) ​​prepared by step (2), the fluorescent nanocrystal / monomer solution obtained by step (3), the magnetic nanoparticles of surface-modified double bonds prepared by step (1) and The oil-soluble initiator is dispersed in the aqueous solution to form an oil-in-water emulsion, reacted at 60-90° C. for 4-7 hours, and centrifuged to obtain magnetic fluorescent composite microspheres.

[0059] The detailed preparation process of the above magnetic fluorescent composite material is shown in Figure 1.

[0060] One of the characteristics of the magnetic fluorescent composite microspheres described in the pre...

Embodiment 1

[0066] Take by weighing 1.315 grams of cadmium perchlorate (Cd(ClO 4 ) 2 ·6H 2 O) Add to 150 milliliters of deoxygenated secondary water, then add 0.55 milliliters of mercaptopropionic acid as a modifier, adjust its pH value to 11.2 with 1 mol / liter of sodium hydroxide solution to form a solution containing mercapto compounds and cadmium ions . On the other hand, inject 30 milliliters of 0.5 mol / liter sulfuric acid solution into a container containing 0.39 grams of aluminum telluride (Al 2 Te 3 ) in the flask, the generated H 2 Put all the Te into the cadmium ion solution, stir for 15 minutes, heat and reflux for 1 minute to 10 days, and obtain an aqueous solution of cadmium telluride fluorescent semiconductor nanocrystals with stable mercaptopropionic acid and a fluorescent emission center wavelength between 430 and 650 nanometers. The fluorescence spectrum is shown in Figure 2.

Embodiment 2

[0068] Take by weighing 1.315 grams of cadmium perchlorate (Cd(ClO 4 ) 2 ·6H 2 O) Add to 150 milliliters of deoxygenated secondary water, then add 0.55 milliliters of mercaptoacetic acid as a modifier, and adjust its pH value to 11.2 with 1 mol / liter of sodium hydroxide solution to form a solution containing mercapto compounds and cadmium ions . On the other hand, get 30 milliliters of 0.5 mol / liter sulfuric acid solution and inject it into 0.26 gram of aluminum selenide (Al 2 Se 3 ) in the flask, the generated H 2 All the Se is passed into the above cadmium ion solution to obtain a cadmium selenide nanocrystal aqueous solution stable with thioglycolic acid.

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Abstract

A magnetism fluorescence composite mainly consists of modified magnetism crystal material, modified fluorescent semiconductor crystal material and matrix material; among them modified magnetism crystal material uses silylating reagent partaking -NH2, -C=C, -SH, -S-S or epoxy group; modified fluorescent semiconductor crystal material uses Reactive surfactant. The composite of this invention not only has excellent fluorescence property but also has conspicuous magnetic response property, its merit is not only fluorescent nanometer crystal and magnetism nanometer particle link with basis material possessing tight Structure through chemical bond, but also the integration of fluorescence and magnetism provides new application for high sensitive bioanalysis and detection.

Description

technical field [0001] The invention relates to a magnetic fluorescent composite material. [0002] The invention also relates to a method for the preparation of the aforementioned materials. [0003] The invention also relates to the use of the aforementioned materials. Background technique [0004] II-VI fluorescent semiconductor nanocrystals (quantum dots) have broad application prospects as a biomarker material in biology and life science research due to their unique fluorescent properties; inorganic magnetic nanocrystals are used in the separation of biomolecules and cells And identification and other fields have important application value. Combining the advantages of both, the combination of magnetic nanocrystals and fluorescent quantum dots to form a new type of composite material is currently becoming a new research hotspot in the biological application of magnetic and fluorescent nanomaterials. Basic research in molecular biology, cell biology and life sciences,...

Claims

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Application Information

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IPC IPC(8): C08L25/04C08L33/08C08L31/04C08K3/22C08F2/22C08F2/44G01N33/533C12Q1/00
Inventor 高明远涂赤枫杨云华
Owner INST OF CHEM CHINESE ACAD OF SCI
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