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Shape and size controllable preparation method of micro-nano silver oxide

A silver oxide, micro-nano technology, applied in nanostructure manufacturing, chemical instruments and methods, nanotechnology, etc., can solve the problems of silver oxide particles difficult to meet the requirements of different industries, uneven particle size, and poor dispersion. To achieve the effect of simple operation, simple equipment and strong operability

Inactive Publication Date: 2007-10-17
XIAMEN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

The chemical precipitation method is mainly to precipitate silver nitrate through barium hydroxide or sodium hydroxide to prepare silver oxide nanoparticles. Although the particle size obtained by this method is very small, the dispersion is not good and the particle size is uneven; In practical industrial applications, different industries require different particle sizes. For example, large particles are required in the battery industry, while small particles are required in chemical catalysis. Therefore, the silver oxide particles prepared by this method are difficult to meet the requirements of different industries.
The electrochemical deposition method mainly uses silver wire as the working electrode, and produces silver oxide particles of different shapes by changing the working voltage. Although it can control the size of the particles by controlling the deposition time, the output is low, which limits its practical application. application

Method used

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  • Shape and size controllable preparation method of micro-nano silver oxide
  • Shape and size controllable preparation method of micro-nano silver oxide
  • Shape and size controllable preparation method of micro-nano silver oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: Add 0.042g silver nitrate to 7.5ml 0.053M ammonia water, stir for 5min to obtain a suspension; add 0.25M 0.25ml sodium hydroxide to the suspension, stir for 5min, and let stand for 2 days to obtain a mixture . The mixture was centrifuged and washed to obtain the final product. The product was characterized by XRD and SEM as silver oxide octahedral structure. As shown in Figures 1 and 2.

Embodiment 2

[0017] Example 2: 0.042g of silver nitrate was added to 7.5ml of 0.06M ammonia water, and stirred for 5 minutes to obtain a mixture of trace amounts of silver oxide and silver ammonia solution. Add 0.25ml of 2M sodium hydroxide to the above solution, stir for 1min, and let stand for 5min. The mixture was centrifuged and washed to obtain the target product. The product was characterized by SEM as silver oxide octahedral structure, as shown in Figure 2.

Embodiment 3

[0018] Example 3: 0.042g of silver nitrate was added to 7.5ml of 0.33M ammonia, and stirred for 6min to obtain silver ammonia solution; 0.25ml of saturated sodium hydroxide was added to the silver ammonia solution, stirred for 5min, left to stand for 12h, and The mixture was washed by centrifugation to obtain the target product, the morphology of which is shown in Figure 3.

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Abstract

A method for preparing micro-nano Ag2O with controllable shape and size relates to a micro-nano Ag2O, particularly to a method for realizing the controllable growth of the micro-nano Ag2O in shape and size by changing the concentration of the reactants. The invention provides a method for changing the reactants concentration from the whole and realizing the controllable growth of the micro-nano Ag2O in shape and size, which is a method for preparing micro-nano Ag2O with controllable shape and size. Mix AgNO3 and ammonia at the Moore ratio of 1:(0.2-10) to produce a mixture A of AgNO3 and ammonia. Add NaOH into the mixture A till the mixture A produces deposit. Stir the mixture and put it still to produce the mixture B. Centrifugate the mixture B and wash the deposit with water and alcohol for at least once in sequence to produce the target product.

Description

technical field [0001] The invention relates to a micro-nano silver oxide, in particular to a method for realizing the controllable growth of the shape and size of the micro-nano silver oxide by changing the concentration of reactants. Background technique [0002] Anisotropy is one of the basic properties of single crystals. Because different crystal planes have different atomic packing densities, they exhibit different properties. Therefore, for the same nanomaterial, one of its properties can be adjusted by controlling its morphology and exposed surface. some physical and chemical properties. At the same time, after substances enter the micro-nano scale, many properties have changed. For example, nano-SiC has a "blue-shift" phenomenon in its absorption spectrum compared with bulk materials, while nano-NiO has a "red-shift" phenomenon in its absorption spectrum compared with bulk materials. In recent decades, many methods have been used to control the size and shape of n...

Claims

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Application Information

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IPC IPC(8): C01G5/00B82B3/00
Inventor 武慧芳谢兆雄徐韬周樨郑兰荪
Owner XIAMEN UNIV
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