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Method for preparing rodlike nano bismuth by utilizing ionothermal method

A technology of ionothermal method and nano-bismuth, which is applied in the field of ionothermal method to prepare nanoparticles, can solve the problems of poor electrical conductivity and thermal conductivity, etc., and achieve the effect of simple equipment, easy process control, and green preparation method

Inactive Publication Date: 2015-11-18
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Bismuth is a silver-white metal with a density of 9.8, a melting point of 271.3°C, and a boiling point of 1560°C. It is brittle and has poor electrical and thermal conductivity.

Method used

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  • Method for preparing rodlike nano bismuth by utilizing ionothermal method
  • Method for preparing rodlike nano bismuth by utilizing ionothermal method
  • Method for preparing rodlike nano bismuth by utilizing ionothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Mix 2 mol of choline chloride, 6 mol of urea and 2 mol of bismuth nitrate, and grind them thoroughly until they are uniform and transparent;

[0025] (2) Put the above-mentioned low-temperature eutectic solvent into the cleaned tetrafluoroethylene lining, and add 7mol of hydrazine hydrate;

[0026] (3) Put the polytetrafluoroethylene lining into the stainless steel reaction kettle and tighten it. The reaction kettle should be placed in the resistance furnace that has been set at 140 ° C in advance;

[0027] (4) After the above reaction lasted for 8 hours, cool down to room temperature with the furnace, take out the reaction kettle, and wash and filter the reaction product with alcohol and deionized water for 3 times;

[0028] (5) Vacuum drying the obtained product to obtain metal bismuth particles.

Embodiment 2

[0030] (1) Mix 1 mol choline chloride, 2 mol urea and 1 mol bismuth nitrate together, and grind them thoroughly until they are uniform and transparent;

[0031] (2) Put the above-mentioned low-temperature eutectic solvent into the cleaned tetrafluoroethylene lining, and add 3mol of hydrazine hydrate;

[0032] (3) Put the polytetrafluoroethylene lining into the stainless steel reaction kettle and tighten it. The reaction kettle should be placed in the resistance furnace that has been set at 140 ° C in advance;

[0033] (4) After the above reaction lasted for 7 hours, cool down to room temperature with the furnace, take out the reaction kettle, and wash and filter the reaction product with alcohol and deionized water for 3 times;

[0034] (5) Vacuum drying the obtained product to obtain metal bismuth particles.

Embodiment 3

[0036] (1) Mix 2 mol of choline chloride, 7 mol of urea and 1 mol of bismuth nitrate, and grind them thoroughly until they are uniform and transparent;

[0037] (2) Put the above-mentioned low-temperature eutectic solvent into the cleaned tetrafluoroethylene lining, and add 4mol of hydrazine hydrate;

[0038] (3) Put the polytetrafluoroethylene lining into the stainless steel reaction kettle and tighten it. The reaction kettle should be placed in a resistance furnace that has been set at 160°C in advance;

[0039] (4) After the above reaction lasted for 6 hours, cool down to room temperature with the furnace, take out the reaction kettle, and wash and filter the reaction product with alcohol and deionized water for 3 times;

[0040] (5) Vacuum drying the obtained product to obtain silver-white bismuth particles.

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Abstract

The invention discloses a method for preparing rodlike bismuth nanoparticles by utilizing an ionothermal method. The method comprises the following steps: firstly weighing proper amount of choline chloride, urea and bismuth nitrate respectively, putting the materials in an agate grinding bowl to be ground until the two kinds of salt is mixed uniformly and the mixture becomes transparent gel, then transferring the mixture to a polytetrafluoroethylene lining, adding a certain amount of hydrazine hydrate as a reducing agent, then putting the polytetrafluoroethylene lining in an autoclave again, taking out the reaction kettle after reacting at 140-200 DEG C for 2-8 hours, taking out the product after the reaction kettle is naturally cooled to the room temperature, washing the product multiple times and carrying out vacuum drying on the product, thus finally obtaining nanoscale rodlike nano bismuth. The method has the technical effects that the method is simple to operate and easy to control, has good repeatability and is environment-friendly, and any surfactant or solvent is not used.

Description

technical field [0001] The invention belongs to the field of preparing nanoparticles by ion thermal method, and in particular relates to a method for preparing rod-shaped nano-bismuth by ion thermal method. Background technique [0002] Bismuth is a silver-white metal with a density of 9.8, a melting point of 271.3°C, and a boiling point of 1560°C. It is brittle and has poor electrical and thermal conductivity. Because bismuth has a low melting point, it can be reduced from its natural ore with charcoal, etc. Bismuth is a semi-metallic element with covalent bonds. The crystal structure has rhombohedrons, each rhombohedron has 10 valence electrons, which is very similar to that of an insulator. Therefore, bismuth has both metallic and non-metallic properties. [0003] Among metal nanopowders, bismuth nanopowder has excellent lubricating properties. Studies have shown that bismuth, an environmentally friendly heavy metal element, is an excellent lubricating material, and has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 张建军陈军李强
Owner NANCHANG HANGKONG UNIVERSITY