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Preparing method of cobalt nanometer materials

A technology of cobalt nanometer and cobalt nitrate, applied in nanotechnology and other directions, can solve the problems of high production cost, impact on health, complicated preparation process, etc., and achieve the effects of simple production equipment, ensuring uniformity and uniform dispersion.

Inactive Publication Date: 2016-02-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method has a disadvantage: nickel carbonyl is a highly toxic substance, which is harmful to human health and easily causes great pollution to the environment
Patent CN1923415 provides a method for preparing flaky cobalt nanoparticles using hydrazine hydrate as a reducing agent and cetyltrimethylammonium bromide as a dispersant, but the reducing agent hydrazine hydrate used is highly toxic and affects health
Wang Zhiyuan of Beijing University of Science and Technology reported that cobalt chloride hexahydrate was used as raw material, and NaBH 4 As a reducing agent, triethanolamine and PVP were used as complexing agents to synthesize cobalt nanoparticles in absolute ethanol. The average particle size of the cobalt nanoparticles they obtained was also greater than 10nm, and it was easy to produce cobalt borides. The reducing agent NaBH 4 The toxicity is also relatively large, the production cost is relatively high, and the preparation process is also comparatively complicated

Method used

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  • Preparing method of cobalt nanometer materials
  • Preparing method of cobalt nanometer materials
  • Preparing method of cobalt nanometer materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Dissolve 1.4699g of cobalt nitrate hexahydrate in 0.1L of deionized water, then weigh 2.1123g of citric acid and add to the above solution, stir magnetically, and add 2.2200g of dispersant to the solution after the citric acid is completely dissolved PVP, continue to stir until the PVP is completely dissolved, put the mixed solution in a drying oven and dry at 150°C for 15 hours to obtain a loose and porous precursor, and then put the precursor in a muffle furnace for calcination. During the calcination process, the tube furnace The inert atmosphere is continuously passed through for protection, the calcination temperature is 300° C., and the calcination time is 7 hours. figure 1 It is the TEM picture of the sample, and it can be seen from the picture that the particle size of the cobalt nanoparticles is 5-10 nm, and the dispersion is good. figure 2 It is the XRD pattern of the sample, and there are three obvious diffraction peaks in the figure. Analysis by ...

Embodiment 2

[0027] Example 2: 1.7638g of cobalt nitrate hexahydrate was dissolved in 0.1L of deionized water, then 1.5899g of ascorbic acid was weighed and added to the above solution, stirred magnetically, and 2.6640g of dispersant PVP was added to the solution after the ascorbic acid was completely dissolved. Continue to stir until the PVP is completely dissolved, put the mixed solution in a drying oven and dry at 160°C for 15 hours to obtain a loose and porous precursor, and then put the precursor in a muffle furnace for calcination. During the calcination process, the tube furnace continues to An inert atmosphere was introduced for protection, the calcination temperatures were respectively set at 300° C. and 500° C., and the calcination time was 6 hours. When the calcination temperature is 300°C ( image 3 a), there is only one very sharp diffraction peak on the XRD pattern of the sample, and the analysis shows that the product at this time is face-centered cubic cobalt. However, whe...

Embodiment 3

[0028] Example 3: Dissolve 2.0578g of cobalt nitrate hexahydrate in 0.1L of deionized water, then weigh 2.0559g of ethylenediaminetetraacetic acid and add it to the above solution, stir it magnetically, and add to the solution after the ethylenediaminetetraacetic acid is completely dissolved. Add 2.3310g of dispersant PVP to the mixture, continue stirring until the PVP is completely dissolved, put the mixed solution in a drying oven and dry at 170°C for 10 hours to obtain a loose and porous precursor, and then put the precursor in a muffle furnace for calcination. During the calcination process, an inert atmosphere was continuously passed into the tube furnace for protection, the calcination temperature was 500° C., and the calcination time was 6 hours. Figure 4 It is the XRD pattern of the sample, and there are three obvious diffraction peaks in the figure, and the analysis shows that the product at this time is a face-centered cubic cobalt nanomaterial.

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Abstract

The invention discloses a preparing method of cobalt nanometer materials. The preparing method comprises the following steps that firstly, cobalt-nitrate hexahydrate, a complexing agent and a dispersing agent are sequentially added into 0.1 L of deionized water, magnetic stirring is carried out, and a mixed solution is obtained; secondly, the solution is placed in a drying box with the temperature of 150-200 DEG C to be dried till the loose porous state is achieved; and thirdly, a precursor is placed in a tubular furnace with the temperature of 300-500 DEG C to be roasted at the high temperature for 5-7 hours, and then the cobalt nanometer materials can be obtained. Cobalt nitrate containing six kinds of crystal water and several common carbohydrate are adopted as raw materials, the raw materials are cheap and easy to obtain, cost is low, and industrial production is greatly facilitated.

Description

technical field [0001] The invention relates to the preparation of metal nanomaterials, in particular to a preparation method of cobalt nanomaterials. Background technique [0002] As a nano-functional metal material, cobalt nanomaterials have a series of special physical and chemical properties, and have shown many excellent properties in the application of cemented carbide, battery materials, catalysts, magnetic materials, wave-absorbing materials, ceramics, etc. . For example, using ultra-fine cobalt powder to make permanent magnetic recording materials can increase the recording density of magnetic tapes and soft hard disks by dozens of times, and can greatly improve their fidelity performance. At the same time, due to the special absorption of electromagnetic waves by ultra-fine cobalt powder, it can be used as military high-performance millimeter-wave stealth materials, visible light-infrared stealth materials and structural stealth materials, and mobile phone radiati...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 李平云张朋周汉斌姜炜李凤生刘宏英郭效德邓国栋顾志明王玉姣
Owner NANJING UNIV OF SCI & TECH
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