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Preparation method for monodispersed FePt/Fe3O4 mixed nanoparticles

A nanoparticle and monodisperse technology, applied in the nano field, can solve the problems of destroying the dispersibility of the original system, agglomeration of nanoparticles, complicated operation process, etc., and achieve the effects of high utilization rate, stable particle dispersion and simple operation steps.

Active Publication Date: 2017-05-31
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the operation process is complicated and the steps are cumbersome; secondly, due to the different preparation methods of the two particles, the dispersion system used is also different. During the mixing process of the two, there may be interaction of the dispersion system and the dispersion effect will be lost. In addition, the acid-base conditions or hydrophilicity and hydrophobicity of different particles are different when they are synthesized, so the functional groups adsorbed on the surface of the particles to maintain their dispersion are also different, and the dispersion of the original system will also be destroyed during the mixing process.

Method used

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  • Preparation method for monodispersed FePt/Fe3O4 mixed nanoparticles
  • Preparation method for monodispersed FePt/Fe3O4 mixed nanoparticles
  • Preparation method for monodispersed FePt/Fe3O4 mixed nanoparticles

Examples

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Effect test

Embodiment 1

[0035] A monodisperse FePt / Fe 3 o 4 A method for preparing mixed nanoparticles, comprising the following steps:

[0036] Step 1, thermal decomposition and reduction to prepare FePt nanoparticles

[0037] In Ar atmosphere, oleic acid, oleylamine, 1,2-hexadecanediol, Pt(acac) 2Add dibenzyl ether in turn, stir evenly, place in a heating furnace for preheating, the preheating temperature is 100°C, and the preheating time is 30min, then, add Fe(CO) 5 , heated to 185°C and kept for 1h to obtain FePt nanoparticles;

[0038] Among them, by volume ratio, oleic acid: oleylamine: Fe(CO) 5 : dibenzyl ether = 1: 2: 0.03: 5; molar ratio, Fe(CO) 5 : 1,2-Hexadecanediol: Pt(acac) 2 =2:1:1;

[0039] Step 2, in situ heating to prepare monodisperse FePt / Fe 3 o 4 Hybrid Nanoparticles:

[0040] (1) FePt nanoparticles are dispersed in n-hexane to obtain a n-hexane solution of FePt nanoparticles with a mass concentration of 0.5g / L;

[0041] (2) Add a n-hexane solution of FePt nanoparticles...

Embodiment 2

[0047] A monodisperse FePt / Fe 3 o 4 The preparation method of mixed nanoparticles is the same as in Example 1, the difference is that in the whole process, a magnetic field with a magnetic field strength of 6T is added to obtain monodisperse FePt / Fe 3 o 4 mixed nanoparticles;

[0048] The monodisperse FePt / Fe that present embodiment makes 3 o 4 The TEM images of the mixed nanoparticles are shown in figure 1 (b), from figure 1 (b) It can be seen that under the condition of applying a strong magnetic field, FePt / Fe was successfully prepared 3 o 4 Hybrid nanoparticles, FePt nanoparticles (A) and Fe 3 o 4 The dispersion of nanoparticles (B) is still good, and the strong magnetic field does not affect the dispersion of nanoparticles.

[0049] The monodisperse FePt / Fe that present embodiment makes 3 o 4 In the mixed nanoparticles, the size distribution diagram of FePt nanoparticles is shown in figure 2 (b), Fe 3 o 4 The size distribution diagram of the nanoparticles ...

Embodiment 3

[0052] A monodisperse FePt / Fe 3 o 4 A method for preparing mixed nanoparticles, comprising the following steps:

[0053] Step 1, preparing FePt nanoparticles by thermal decomposition and reduction, same as Example 1;

[0054] Step 2, in situ heating to prepare monodisperse FePt / Fe 3 o 4 Hybrid Nanoparticles:

[0055] (1) FePt nanoparticles are dispersed in n-hexane to obtain a n-hexane solution of FePt nanoparticles with a mass concentration of 0.5g / L;

[0056] (2) In the mixed solvent of oleic acid, oleylamine, octadecene and dibenzyl ether, add the n-hexane solution of FePt nanoparticle, obtain reaction system; Wherein, by volume ratio, oleic acid: oleylamine: octadecene : dibenzyl ether=1: 1: 1: 2; the mass concentration of FePt nanoparticles in the mixed solvent is 2g / L;

[0057] The reaction system was heated to 250°C in the atmosphere, the heating rate was 5°C / min, and the temperature was kept for 1h to prepare monodisperse FePt / Fe 3 o 4 Mix nanoparticles.

[00...

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Abstract

The invention provides a preparation method for monodispersed FePt / Fe3O4 mixed nanoparticles and belongs to the technical field of nanometers. The preparation method comprises the steps that (1), in an inert gas atmosphere, oleic acid, oleylamine, a reducing agent and Pt (acac) 2 are sequentially added to a solvent, stirred uniformly and then preheated at the temperature of 100-120 DEG C for 5-30 min, Fe(CO)5 is added, the temperature is increased to 150-280 DEG C and kept for 1-2 h, and FePt nanoparticles are prepared; and (2), the FePt nanoparticles dispersed in an alkane solvent are added to a reaction solvent, the system is heated to 50-250 DEG C in a certain atmosphere, the temperature is kept for 0.5-4 h, and the monodispersed FePt / Fe3O4 mixed nanoparticles are prepared. By the adoption of the method, the FePt / Fe3O4 mixed nanoparticles prepared through an in-situ method have the remarkable beneficial effects of being low in cost, easy to operate, high in product quality, good in stability and the like, and the monodispersed FePt / Fe3O4 mixed nanoparticles prepared through the method provide the convenience condition to application and development of multifunctional composite nanoparticles.

Description

technical field [0001] The invention belongs to the field of nanotechnology, in particular to a monodisperse FePt / Fe 3 o 4 Preparation method of hybrid nanoparticles. Background technique [0002] Monodisperse Fe 3 o 4 Magnetic nanoparticles have the remarkable characteristics of good soft magnetism and strong biocompatibility, and have broad application prospects in the fields of magnetic separation, medical imaging, and biosensors. with Fe 3 o 4 Different, monodisperse FePt nanoparticles have excellent electrocatalytic activity and stability, and FePt nanoparticles with magnetically ordered structure also have excellent hard magnetism, which can be used in fuel cell catalysis, ultra-high density magnetic storage, high-performance permanent magnets, etc It has great application prospects. Therefore, the successful preparation of monodisperse FePt / Fe 3 o 4 Mixed nanoparticles will have these excellent properties at the same time, thus greatly broadening the applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F1/0545
Inventor 王凯吴纯刘治鲁牛良杨淦婷李丹王强
Owner NORTHEASTERN UNIV
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