Method for purifying Fe3O4 nano-particles taking oleic acid as ligand and synthesizing magnetic nano-stirrers and application

A nanoparticle, magnetic nanotechnology, applied in the direction of nanotechnology, magnetic materials, magnetic objects, etc. for materials and surface science

Active Publication Date: 2020-10-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this by-product is difficult to remo

Method used

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  • Method for purifying Fe3O4 nano-particles taking oleic acid as ligand and synthesizing magnetic nano-stirrers and application
  • Method for purifying Fe3O4 nano-particles taking oleic acid as ligand and synthesizing magnetic nano-stirrers and application
  • Method for purifying Fe3O4 nano-particles taking oleic acid as ligand and synthesizing magnetic nano-stirrers and application

Examples

Experimental program
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Embodiment 1

[0052] A kind of Fe with oleic acid as ligand 3 o 4 A method for purifying nanoparticles and synthesizing a magnetic nanostirrer, comprising the following steps:

[0053] (1) Weigh 3.65g of sodium oleate and add it to a mixed solution of 28mL ethanol, deionized water, and n-hexane, stir until fully dissolved, then add 1.08g of ferric chloride hexahydrate, heat to 70°C and reflux for 4h . After cooling to room temperature, extract with 10mL of water, rotary steam the extracted solution to obtain a reddish-brown waxy solid which is iron oleate mixture, then stir the mixture with 20.57g of oleic acid and octadecene, and heat to 320 Keep at ℃ for 30min, cool to room temperature, precipitate nanospheres with 50mL ethanol, and disperse the precipitate with 50mL chloroform to obtain Fe with a particle size of 10nm 3 o 4 nanosphere solution.

[0054] (2) Analyze the physical properties of the by-products produced in the synthesis of magnetic nanoparticles, so as to formulate thei...

Embodiment 2

[0060] A kind of Fe with oleic acid as ligand 3 o 4 The method for purifying and synthesizing the magnetic nano-stirrer of nanoparticles comprises the following steps:

[0061] (1) Add 0.706g iron acetylacetonate to 10.4g oleic acid, 4-phenylbenzoic acid, dibenzyl ether mixed solution, put it in a three-neck round bottom flask, keep it for 1h, then heat it to 290°C for 30min, cool to At room temperature, wash with a mixed solution of 40mL toluene and 10mL n-hexane, centrifuge and disperse to obtain 25nm Fe 3 o 4 nanocube.

[0062] (2) Measure Fe in 1mL step (1) 3 o 4 The nanocube solution was dispersed in 3mL of toluene and soaked for 36h.

[0063] (3) Fe processed by step (2) 3 o 4 The nanocubes were centrifuged at 500 g, and the resulting precipitate was dispersed in 1 mL of chloroform to obtain Fe 3 o 4 A solution of nanocubes.

[0064] (4) 500 μL of Fe from step (3) 3 o 4 Nanocube solution, 0.3g of citric acid, 12mL of a mixed solution of 1,2-dichlorobenzene a...

Embodiment 3

[0067] A kind of Fe with oleic acid as ligand 3 o 4 The method for purifying and synthesizing the magnetic nano-stirrer of nanoparticles comprises the following steps:

[0068] (1) 10nm Fe 3 o 4 The preparation method of the nanosphere solution is the same as in Example 1.

[0069] (2) The nanosphere soaking method is the same as in Example 1.

[0070] (3) Fe processed by step (2) 3 o 4 The nanosphere solution was centrifuged at 500 g, and the obtained precipitate was dispersed in 1 mL of chloroform to obtain Fe 3 o 4 solution of nanospheres.

[0071] (4) The ligand exchange method of the nanosphere solution is the same as in Example 1.

[0072] (5) The assembly process is the same as that in Example 1. A nano-stirrer with a width of ~50nmm and a length of ~280nm was obtained.

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Abstract

The invention discloses a method for purifying Fe3O4 nano-particles taking oleic acid as a ligand and synthesizing magnetic nano-stirrers and application, relates to a technology for synthesizing themagnetic nano-stirrers, and belongs to the technical field of inorganic nano-material synthesis. The technology comprises the following steps: synthesizing Fe3O4 nano-particles taking oleic acid as aligand; effectively removing iron oleate by-products on the surfaces of particles; carrying out subsequent hydrophilic treatment on the Fe3O4 nano particles; adjustment of assembly mode, realizing effective assembly of the magnetic nanoparticle chain; especially for small-size nano magnetic particles. Pretreatment before particle assembly and adjustment of an assembly mode are provided, assembly of small-size nano chains is achieved, world records of the minimum-size nano chains are broken through, meanwhile, the chain forming probability of the nano stirrer is greatly increased, and high practicability is achieved.

Description

technical field [0001] The present invention relates to a kind of synthetic technology of nano stirrer, especially a kind of synthesis raw material for synthetic nano stirrer——Fe 3 o 4 The purification technology of nano particles belongs to the technical field of inorganic nano material synthesis. Background technique [0002] Stirring is the best way to mix liquids. Macroscopic stirring can be achieved with special tools, such as electric stirrers, mechanical stirrers, and magnetic stirrers. On the microscopic scale, the viscosity of the liquid becomes larger, the Reynolds number decreases, and the mixing of the liquid becomes difficult. The conventional way is to achieve a certain degree of liquid disturbance by constructing temperature gradients, ultrasonic waves, and changing pipelines. These methods are either difficult to operate or have limitations in use, or it is difficult to change the pipeline in a later stage once it is finalized. Stirring is especially impo...

Claims

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Application Information

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IPC IPC(8): H01F1/01B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01F1/017
Inventor 刘雪洋陈虹宇胡婷
Owner NANJING UNIV OF TECH
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