Method for preparing Co3O4 nano material by hydrothermal method under magnetic field effect

A nanomaterial and magnetic field technology, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of high equipment requirements and difficult to control microstructure, and achieve the effect of simplified process, grain refinement and uniform dispersion.

Inactive Publication Date: 2009-05-20
SHANGHAI UNIV
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Problems solved by technology

Currently preparing nano-Co 3 o 4 The methods mainly include sol-gel method, oxidation-reduction method, high-temperature thermal decomposition method, chemical vapor deposition method, electrochemical deposition method, ray irradiation method, liquid phase precipitation method, etc., and their common characteristics are: first prepare divalent cobalt Hydroxide, oxide or salt, then pyrolytic oxidation and crystallization at 300~500°C; the disadvantage is that the microstructure of the obtained product is difficult to control and requires high equipment

Method used

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  • Method for preparing Co3O4 nano material by hydrothermal method under magnetic field effect
  • Method for preparing Co3O4 nano material by hydrothermal method under magnetic field effect
  • Method for preparing Co3O4 nano material by hydrothermal method under magnetic field effect

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Co in this example 3 o 4 Nano powder material preparation steps are as follows:

[0025] (1) first use deionized water to cobalt nitrate is mixed with the cobalt brine aqueous solution of 0.56mol / L, and ammonium chloride and ammoniacal liquor are mixed with the ammonia buffer solution of pH=10 as precipitation agent, surfactant sodium lauryl sulfate ( SDS) was prepared as a 75.6g / L aqueous solution.

[0026] (2) According to NH 3 :Co 2+ The molar ratio=3:1, the filling degree is 70% and the setting parameters are carried out. Take 6.75ml of cobalt nitrate aqueous solution into a 100ml beaker, stir with a magnetic stirrer, then add 2.5ml of surfactant SDS, stir for 5 minutes, then add 2.5ml of precipitant ammonia buffer solution, continue stirring for 5 minutes, then add hydrogen peroxide 2.0ml, then after stirring for 30 minutes, move it into a 25ml polytetrafluoroethylene-backed autoclave, then add 3.75ml of solvent n-butanol to the autoclave, and finally seal the...

Embodiment 2

[0029]The preparation steps in this example are exactly the same as those in Example 1 above, the difference being: ①The magnetic field strength is 100T; ②Dry in a vacuum oven at 60°C for 8 hours; ③Use ethanol as a solvent; ④The holding time is 4 hours . Finally got Co 3 o 4 Nano powder material.

Embodiment 3

[0031] The preparation steps in this example are exactly the same as those in Example 1 above, except that: ①The magnetic field strength is 4T; ②Use 50g / L polyethylene glycol 20,000 instead of SDS; ③Heat up to a reaction temperature of 180°C; ④Insulate The time is 10 hours. Finally got Co 3 o 4 Nano powder material.

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Abstract

The invention relates to a method for preparing Co3O4 nano material under the action of a magnetic field by a hydrothermal method, which belongs to the technical field of chemical material technology. The method of the invention adopts cobalt salt, a dispersant, a precipitator, a surfactant and a solvent as the raw material; the precipitator and the cobalt salt react in a reaction kettle for 4-36 hours under the conditions that the molar mass ratio between the precipitator and the cobalt salt is 1:1-6:1, the compactness is 50-85 percent, the magnetic field strength is 1-100 Tesla on the basis of the hydrothermal method, and the reaction temperature is 100-240 DEG C to obtain the reaction product, and then the product is dried in a vacuum drying chamber for 6-12 hours under 60-80 DEG C to obtain the powder material of Co3O4. The Co3O4 nano powder material prepared by the method of the invention has the advantages of finer crystal grain, uniform dispersion and extremely high purity without other impurities.

Description

technical field [0001] The invention relates to a hydrothermal method for preparing Co under the action of a magnetic field 3 o 4 The nanomaterial method belongs to the technical field of chemical and chemical materials technology. Background technique [0002] As a nano-solid composed of single-phase nanoparticles, nano-oxide powder is a new type of material with high chemical activity, outstanding optical properties, electrical properties, and magnetic properties. It has important application value in many aspects such as biology and medicine. co 3 o 4 As a kind of nano-metal oxide materials, nanomaterials have broad application prospects in lithium-ion batteries, catalysts, pigments, and magnetic materials. Therefore, they have attracted extensive attention from researchers around the world. , electrochemistry, materials science and engineering, etc. Currently preparing nano-Co 3 o 4 The methods mainly include sol-gel method, oxidation-reduction method, high-tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
Inventor 邓小龙李瑛朱明原王谆朱真真金红明
Owner SHANGHAI UNIV
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