Magnetic composite microsphere loaded with precious metal quantum dots and preparation method of magnetic composite microsphere

A technology of magnetic composite microspheres and precious metals, which is applied in the preparation of microspheres, the magnetism of organic materials/organic magnetic materials, and microcapsule preparations. It can solve the problems of decreased fluorescence intensity and difficulty in controlling the amount of adsorption of quantum dots, and achieves application prospects. The effect of broad, excellent magnetic properties

Active Publication Date: 2014-03-19
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the adsorption amount of quantum dots is difficult to control, and the fluorescence intensity of the two particles drops sharply due to direct contact.
[0005] At present, the composite microspheres with tunable optical and magnetic properties have not been reported yet, using magnetic polymers with a core-shell structure with controllable magnetic content as the carrier.

Method used

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  • Magnetic composite microsphere loaded with precious metal quantum dots and preparation method of magnetic composite microsphere
  • Magnetic composite microsphere loaded with precious metal quantum dots and preparation method of magnetic composite microsphere
  • Magnetic composite microsphere loaded with precious metal quantum dots and preparation method of magnetic composite microsphere

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of magnetic polymer microspheres

[0035] 40mg of isoalcohol diester maleate was dissolved in 40mL of deionized water, mechanically stirred for 2 hours, and 0.5g of Fe was added 3 o 4 , 3g styrene monomer, blow nitrogen, continue to stir for 12 hours, then add 30mg potassium persulfate and raise the temperature to 65°C to react for 24 hours to obtain a magnetic polymer microsphere emulsion with a core-shell structure. The structure of the obtained microspheres was characterized by transmission electron microscopy (TEM), as figure 1 , the overall size of the magnetic polymer microsphere is about 250nm, the size of the core layer is about 150nm, and the thickness of the shell layer is about 50nm; Fe 3 o 4 Contained inside the microspheres, the size is about 8nm.

[0036] (2) Loading of noble metal quantum dots

[0037] Take 1mL of the magnetic polymer microsphere emulsion in step (1) and dilute it to 10mL with deionized water; add 1mL of chloroauric a...

Embodiment 2～4

[0041] With the process of Example 1, the addition of the chloroauric acid aqueous solution in step (3) is changed to 0.5mL, 1.0mL, and 1.5mL, and the absorption wavelength of UV-vis is 530nm, 560nm, and 690nm, such as Figure 5 shown.

Embodiment 5～7

[0043] In the same process as in Example 1, the types of noble metal acid compounds in step (2) were changed to silver nitrate, chloroplatinic acid, and chloropalladium acid to obtain different types of composite microspheres. The results are shown in the following table:

[0044]

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Abstract

The invention discloses a magnetic composite microsphere loaded with precious metal quantum dots and a preparation method of the magnetic composite microsphere. The magnetic composite microsphere comprises magnetic polymer microspheres and the precious metal quantum dots loaded on the surfaces of the magnetic polymer microspheres. The magnetic composite microsphere takes the magnetic polymer microspheres as carriers, and the precious metal quantum dots are loaded on the surfaces of the magnetic polymer microspheres, so that the magnetic composite microsphere has an excellent magnetic property; the movement direction can be controlled through the action of the an external magnetic field; and light and heat conversion of the microspheres absorbed in an infrared region can be effectively realized, and the magnetic composite microsphere has a wide application range in fields such as tumor thermotherapy and the like.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a magnetic composite microsphere loaded with noble metal quantum dots and a preparation method thereof. Background technique [0002] In recent years, noble metal quantum dots have attracted the interest of researchers due to their excellent properties. Quantum dots refer to nanocrystals with a radius smaller than or close to the laser Bohr radius. It is a new type of material that is different from the bulk and different from the characteristics of molecules and atoms. It has unique quantum size effects and surface enhancement effects. Compared with traditional organic dyes, the absorption spectrum of quantum dots depends on their particle size and the distance between quantum dots, covering from ultraviolet to infrared region, with excellent spectral characteristics and stable photochemical properties. It has good applications in fields such as gene ana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/42C08F212/08C08F222/14B01J13/02
CPCC08F212/08H01F1/42C08F222/14
Inventor 戴李宗陈凌南吴悦广曾碧榕叶华立陈国荣许一婷罗伟昂项佳懿
Owner XIAMEN UNIV
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