Preparation method of ferroferric oxide@silicon dioxide@zinc selenide fluorescent magnetic nanometer particles

A technology of magnetic composite nanometer and ferroferric oxide, which is applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., to achieve the effect of simple device, relatively large particle size distribution and easy realization

Inactive Publication Date: 2014-03-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few studies on the preparation of this material, so how to prepare the fluorescent magnetic composite nanoparticles of ferric oxide, silicon selenide, zinc selenide has very important practical significance

Method used

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  • Preparation method of ferroferric oxide@silicon dioxide@zinc selenide fluorescent magnetic nanometer particles
  • Preparation method of ferroferric oxide@silicon dioxide@zinc selenide fluorescent magnetic nanometer particles
  • Preparation method of ferroferric oxide@silicon dioxide@zinc selenide fluorescent magnetic nanometer particles

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preparation example Construction

[0024] (3) Preparation of zinc selenide quantum dots

[0025] Step 5: Take 0.0085g of NaBH4 and 0.0059g of Se powder respectively, and dissolve them in 2mL of distilled water under the protection of nitrogen to obtain the Se precursor; take 0.1317g of zinc acetate and dissolve them in distilled water, add an appropriate amount of TGA, and then use NaOH to adjust the pH of the solution to 9 ~11, to obtain a Zn precursor; mix the two precursor solutions, reflux in an oil bath at 90° C., and react with magnetic stirring for 1 hour. After the reaction is completed, the zinc selenide quantum dots are obtained.

[0026] (4) Preparation of Magnetic Fluorescent Fe3O4SiO2ZnSe Composite Nanoparticles

[0027] Step 6: Take TritonX-100, n-hexanol, and cyclohexane solutions according to a certain volume ratio, put them in a beaker, and disperse them ultrasonically for 20 minutes to obtain a microemulsion system; add an appropriate amount of APTES to the freshly prepared iron ferric oxide ...

Embodiment 1

[0029] Example 1: (1) Preparation of Fe3O4 nanoparticles by hydrothermal method

[0030] Step 1. Dissolve 4.3248g of ferric chloride and 2.7802g of ferric chloride into the water-ethylene glycol mixed solution, transfer them to a four-necked flask with a water bath at 70°C under the condition of protective gas (nitrogen), and use the prepared A good NaOH is used to adjust the pH value of the solution (pH ≈ 10), and then an appropriate amount of surfactants sodium oleate and sodium dodecylbenzenesulfonate are quickly added, and mechanically stirred for 30 minutes to obtain a precursor solution of ferric oxide.

[0031] Step 2. Transfer the above precursor solution into a high-pressure reactor, react at 160-200°C for 6-10 hours, take out the product after the reaction is completed, wash with distilled water and absolute ethanol, repeat 5-6 times, and finally, put The washed reaction product is vacuum-dried to obtain ferric oxide nano-magnetic particles.

[0032] (2) Preparation...

Embodiment 2

[0039] Embodiment 2: The method and steps are the same as those of Embodiment 1, the only difference is that the temperature of the water area in Step 1 is changed to 65° C. in the process of preparing ferric oxide nanoparticles by the hydrothermal method.

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Abstract

The invention discloses a preparation method of ferroferric oxide@silicon dioxide@zinc selenide fluorescent magnetic nanometer particles. The preparation method is characterized in that the silicon dioxide grows on ferroferric oxide nano particles in situ, obtained ferroferric oxide@silicon dioxide particles are composited with quantum dots, and the ferroferric oxide@silicon dioxide@zinc selenide fluorescent magnetic nanometer particles are prepared by adopting a reverse micro-emulsion method. A device needed in the preparation method is simple, the preparation method is easily realized, the nanometer particles obtained through the method are unlikely to aggregate, and the granularity distribution is uniform.

Description

technical field [0001] The invention belongs to the field of biological materials, in particular to a method for preparing ferric oxide silicon dioxide zinc selenide fluorescent magnetic composite nanoparticles. Background technique [0002] Iron ferric oxide nanoparticles have excellent characteristics and have broad application prospects in the fields of biomedicine, magnetic imaging and photocatalysis. However, ferric oxide nanoparticles are active in chemical properties, easy to oxidize and have a strong tendency to aggregate. People often wrap a layer of silicon dioxide on their surface to reduce the surface activity of the particles to obtain better dispersed nanoparticles. Silicon dioxide has good biocompatibility, hydrophilicity and excellent chemical stability. In addition, after being coated with a silicon layer, it can further protect the ferroferric oxide nanocrystals from being oxidized. Quantum dots have unique fluorescent properties and can be used as a bioma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88H01F1/10B82Y30/00B82Y40/00
Inventor 邓义群胡慧林
Owner TIANJIN UNIV
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