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A shape-controllable fe 3 o 4 Preparation methods of nanomaterials

A nanomaterial, fe3o4 technology, applied in the direction of nanotechnology, ferrous oxide, iron oxide/iron hydroxide, etc., can solve the problems of unfavorable industrialization development, low production efficiency, and complicated preparation of raw materials, and achieve non-magnetic Hysteresis, low cost, good repeatability

Active Publication Date: 2020-04-10
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In recent years, through the research on the above methods, Fe 3 o 4 The preparation of nanomaterials has made significant progress, but there are also some shortcomings in the following points: (1) the preparation of raw materials is complicated and the cost is high, which is not conducive to the development of industrialization; Process-related hazards or production inefficiencies

Method used

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  • A shape-controllable fe <sub>3</sub> o <sub>4</sub> Preparation methods of nanomaterials
  • A shape-controllable fe <sub>3</sub> o <sub>4</sub> Preparation methods of nanomaterials
  • A shape-controllable fe <sub>3</sub> o <sub>4</sub> Preparation methods of nanomaterials

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Effect test

Embodiment 1

[0037] FeCl 3 ·6H 2 O and ethylene glycol were placed in a beaker, FeCl 3 ·6H 2 The mass volume ratio (mg / mL) of O and ethylene glycol is 30:1, then add urea, FeCl 3 ·6H 2 The molar ratio of O and urea is (mol) 4:17, then mechanically stir the mixture in the beaker to mix the above raw materials evenly, pour it into a three-necked flask and heat it under reflux, the temperature of reflux heating is 195°C, and the time of reflux heating is 5min , continue to feed nitrogen during the reflux heating process, then cool to room temperature, and use ethanol to wash centrifugally to obtain Fe 3 o 4 Precursor. figure 1 It is the Fe that the present invention obtains when the time of reflux heating is 5min 3 o 4 SEM images of the precursors. Finally, the precursor nanosheets were calcined in a high-temperature furnace, and the temperature was maintained at 500 °C for 3 h, and nitrogen protection was introduced.

[0038] The final product is Fe with a size of 20 nm 3 o 4 Nan...

Embodiment 2

[0040] FeCl 3 ·6H 2 O and ethylene glycol were placed in a beaker, FeCl 3 ·6H 2 The mass volume ratio (mg / mL) of O and ethylene glycol is 30:1, then add urea, FeCl 3 ·6H 2 The molar ratio of O and urea is (mol) 4:3, then mechanically stir the mixture in the beaker to mix the above raw materials evenly, pour it into a three-necked flask and heat it under reflux, the temperature of reflux heating is 195°C, and the time of reflux heating is 20min , continue to feed nitrogen during the reflux heating process, then cool to room temperature, and use ethanol to wash centrifugally to obtain Fe 3 o 4 Precursor nanosheets. Finally, the precursor nanosheets were calcined in a high-temperature furnace, and the temperature was maintained at 500 °C for 3 h, and nitrogen protection was introduced.

[0041] The final product is Fe with a size of 3.5 μm 3 o 4 Nanosheets, the product morphology is as follows figure 2 As shown, the saturation magnetization is 70emu / g, and the remanenc...

Embodiment 3

[0043] The difference between this embodiment and embodiment 2 is that FeCl 3 ·6H 2 The molar ratio of O and urea is (mol) 4:11, all the other are identical with embodiment 2.

[0044] The final product is Fe with a size of 2.5 μm 3 o 4 Nano-flower-like particles, the product appearance is as follows image 3 As shown, the saturation magnetization is 73emu / g, and the remanence and coercive force are approximately zero.

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Abstract

The invention discloses a preparation method of Fe3O4 nanomaterial with controllable morphology, and relates to the technical field of nano functional materials. The method aims at the shortcomings ofthe existing Fe3O4 nanomaterial in the method for preparing a special morphology, such as adding a surfactant. The method provides a self-assembly preparation method controlled by urea. The continuous morphology between the nanoparticles, the nanosheets and the nanoflowers can be controlled by the ratio of urea addition and the reflux reaction time. The particle size is 1 to 3.5Mum with good dispersibility, which can be dispersed in water; the material has good magnetic properties and has no hysteresis, no remanence and no coercive magnetic field at room temperature. Since the saturation magnetization is 60-80emu / g, the material can be separated by an ordinary magnet and exhibits superparamagnetism at normal temperature.

Description

technical field [0001] The invention belongs to the technical field of nano functional materials, and in particular relates to a Fe with the transition from nano particles to nano flower balls. 3 o 4 method of preparation. Background technique [0002] The small size effect, quantum size effect, and surface effect of magnetic nanomaterials make it have abnormal magnetic properties that conventional coarse-grained materials do not have. In addition to considerable developments in traditional fields such as information storage, sensors, and magnetic fluids, targeted drug delivery, bioseparation, medical diagnosis, DNA separation and detection also have broad application prospects and great potential value. Fe 3 o 4 Nanoparticles are the most researched materials in magnetic nanoparticle materials. Its basic properties have the following aspects: preparation of Fe 3 o 4 Nanoparticle raw materials are cheap; Fe 3 o 4 The theoretical spin polarization rate of 100%, there ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/08B82Y40/00
CPCB82Y40/00C01G49/08C01P2002/72C01P2004/03C01P2004/30C01P2004/32C01P2004/61C01P2004/64C01P2006/42
Inventor 刘洋陈悦张小龙姜雨虹张永军杨景海
Owner JILIN NORMAL UNIV
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