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Bismuth micron particle and manufacturing method thereof

A technology of micron particles and particles, which is applied in the fields of chemical engineering and functional micro-nano materials, and achieves the effect of simple preparation methods

Inactive Publication Date: 2015-04-22
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Bi microparticles with extremely high crystallinity have a longer mean free path of carriers, so they have a better giant magnetoresistance effect than bulk materials or nanomaterials. There is no literature report yet

Method used

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  • Bismuth micron particle and manufacturing method thereof
  • Bismuth micron particle and manufacturing method thereof
  • Bismuth micron particle and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The bismuth microparticles prepared in this example were prepared by the following method: 3 mmol bismuth nitrate and 3 mmol CTAC were added to 60 mL of ethylene glycol, stirred at 500 r / min until dissolved, and then 1 mol / L of KOH was added dropwise therein ethylene glycol solution to a pH greater than 10. After obtaining a clear solution, continue stirring for 1 hour, transfer the solution to a closed polytetrafluoroethylene-lined high-pressure reactor, and place it in a blast oven at 180°C for 12 hours, take it out after natural cooling, and filter the obtained product with suction. Wash with deionized water until neutral, and use ethanol to wash away the template agent. Finally, the filtered product was vacuum-dried at 60° C. for 12 h to obtain the target product.

[0016] The field emission scanning electron microscope photograph of the bismuth microparticle provided by the present embodiment is as follows figure 1 shown by figure 1 It can be seen from the figur...

Embodiment 2

[0018] The bismuth microparticles prepared in this example were prepared by the following method: 3 mmol of bismuth acetate and 2.5 mmol of CTAC were added to 60 mL of ethylene glycol, stirred at 500 r / min until dissolved, and then 1 mol / L of KOH in ethylene glycol to a pH greater than 10. After obtaining a clear solution, continue stirring for 1 hour, transfer the solution to a closed polytetrafluoroethylene-lined high-pressure reactor, and place it in a blast oven at 160°C to react for 12 hours, take it out after natural cooling, and filter the obtained product with suction. Wash with deionized water until neutral, and use ethanol to wash away the template agent. Finally, the filtered product was vacuum-dried at 60° C. for 12 h to obtain the target product.

Embodiment 3

[0020] The bismuth microparticles prepared in this example were prepared by the following method: 3 mmol of bismuth nitrate and 1 mmol of CTAC were added to 60 mL of ethylene glycol, stirred at 500 r / min until dissolved, and then 1 mol / L of KOH was added dropwise therein ethylene glycol solution to a pH greater than 10. After obtaining a clear solution, continue stirring for 1 hour, transfer the solution to a closed polytetrafluoroethylene-lined high-pressure reactor, and place it in a blast oven at 160°C to react for 12 hours, take it out after natural cooling, and filter the obtained product with suction. Wash with deionized water until neutral, and use ethanol to wash away the template agent. Finally, the filtered product was vacuum-dried at 60° C. for 12 h to obtain the target product.

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Abstract

The invention provides a bismuth micron particle. The particle is a bismuth elementary substance, the particle size of the particle is 1 micron to 3 microns, and the particle is spherical or polyhedral. The method for manufacturing the particle comprises the following steps that a bismuth source and template agents are added to glycol and stirred to be completely dissolved, then the pH value of a solution is adjusted to be larger than 10 while stirring is carried out, after solute is completely dissolved, the solution is transferred into a closed polytetrafluoroethylene lining high-pressure reaction still, a reaction is carried out for more than 10 h under the condition of 160 DEG C to 200 DEG C, a product is centrifuged or filtered after the reaction is finished, residual solute is removed through washing, and the bismuth micron particle can be obtained through drying and cooling. The positive colossal magnetoresistance of the bismuth micron particle is more than 700 percent at low temperature, the positive colossal magnetoresistance of the bismuth micron particle is more than 180 percent at indoor temperature, and the manufacturing method of the bismuth micron particle is simple.

Description

technical field [0001] The invention provides a bismuth micron particle, in particular to a method for preparing a high giant magnetic effect bismuth micron particle in an alkaline environment, and belongs to the technical fields of chemical engineering and functional micro-nano materials. Background technique [0002] The giant magnetoresistance effect refers to the phenomenon of huge changes in material resistance caused by an external magnetic field, which can be used in information technology fields such as magnetic recording, magnetic head readout, magnetic information storage, giant magnetoresistance sensors, and magnetoelectronics. [0003] Bismuth is a semimetal with unique electrical properties due to its high anisotropic Fermi surface, low carrier concentration, and small carrier effective mass. Because bismuth has a large Fermi wavelength and a long carrier mean free path, a lot of research has focused on its quantum transport and size confinement effects. The ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24
Inventor 马珑珑杨超田亚洋田熙科周朝昕王龙艳罗东岳
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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