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Method for preparing nano quantum dot level Fe3O4 superparamagnetic particles

A technology of superparamagnetic particles and nano-quantum dots is applied in the preparation of nano-quantum dot-level Fe3O4 superparamagnetic particles and the field of preparation of Fe3O4 superparamagnetic particles, which can solve the problem of high requirements for preparation conditions, long synthesis period and high price. and other problems, to achieve the effect of simple and mature process, short reaction period and convenient operation

Inactive Publication Date: 2011-08-17
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

All of the above methods can obtain monodisperse Fe 3 o 4 Nanoparticles, and the particle size is controllable, but these methods have high requirements on experimental equipment and preparation conditions, and organic substances such as raw material organic iron compounds and reaction solvents are highly toxic, expensive, low yield, and long synthesis cycle, which limits its wide application. application

Method used

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  • Method for preparing nano quantum dot level Fe3O4 superparamagnetic particles
  • Method for preparing nano quantum dot level Fe3O4 superparamagnetic particles
  • Method for preparing nano quantum dot level Fe3O4 superparamagnetic particles

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 0.4043 g metal precursor Fe(NO 3 ) 3 9H 2 O was added to a three-necked flask containing 100 mL of triethylene glycol, condensed and refluxed at 100 °C for 30 min, and continued to heat up to 250 °C and kept at this temperature for 30 min to obtain 2.8 nm Fe 3 o 4 colloid. From image 3 It can be seen that the obtained Fe 3 o 4 Quantum dots exhibit ferromagnetism below 25 K, and superparamagnetism when the temperature exceeds 25 K; from Figure 4 It can be seen that the obtained Fe 3 o 4 The magnetization curve of quantum dots crosses zero, the coercive force is zero, and the remanent magnetization is zero, indicating that it has superparamagnetism at room temperature.

Embodiment 2

[0027] Weigh 0.8080 g metal precursor Fe(NO 3 ) 3 9H 2 Add O into a three-necked flask containing 100 mL of diethylene glycol, condense and reflux at 100 °C for 30 min, continue to raise the temperature to 250 °C and keep at this temperature for 30 min to obtain Fe 3 o 4 colloid.

Embodiment 3

[0029] Weigh 1.2121 g metal precursor Fe(NO 3 ) 3 9H 2 O was added to a three-necked flask containing 100 mL of triethylene glycol, condensed and refluxed at a temperature of 100 °C for 30 min, continued to heat up to 230 °C and kept at this temperature for 60 min to obtain Fe 3 o 4 colloid.

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Abstract

The invention discloses a method for preparing nano quantum dot level Fe3O4 superparamagnetic particles, which comprises the following steps of: adding ferric metal salt into alcohol ether to prepare a solution with the ferric ion concentration of 0.01-0.5 mol / L; and heating the solution to react by using a two-stage heating method, firstly heating to 100 DEG C to uniformly mix the solution, secondly heating to 230-270 DEG C, and reacting until the solution becomes brown to obtain Fe3O4 superparamagnetic particles. In the invention, alcohol ether is simultaneously used as a stabilizing agent, a reducing agent and a protecting agent, a common vessel and a regular synthesis device are used, and the regulation on the pH value is not required. The reaction is carried out at normal temperature and pressure, has a short period, is convenient to operate, and can be controlled through temperature, and the process is simple and mature. The particle size of obtained Fe3O4 nano quantum dots is less than 5 nm, the shape can reach 100%, and the yield is high.

Description

technical field [0001] The present invention relates to a kind of Fe 3 o 4 The preparation method of superparamagnetic particle, specifically relates to a kind of nano quantum dot grade Fe 3 o 4 The invention discloses a method for preparing superparamagnetic particles, which belongs to the field of preparation of inorganic nanometer materials. Background technique [0002] Due to the quantum size effect exhibited by materials at the nanometer scale, nanomaterials have different physical and chemical properties from bulk materials. Magnetic nanoparticles are an important class of nanomaterials. In addition to quantum size effects, they also exhibit unusual magnetic properties, such as superparamagnetism, high coercive force, low Curie temperature, and high magnetic susceptibility. Fe 3 o 4 Magnetic nanoparticles are a new type of magnetic material developed in recent years. Due to their special magnetic orientation and superparamagnetism, they are widely used in the fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08B82Y40/00
Inventor 张昭良杨曦辛颖蒋品王仲鹏李倩
Owner UNIV OF JINAN
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