Original ecology separation and redispersion method of nano metallic colloid

An original ecological and re-dispersion technology, applied in the field of nanomaterials, can solve the problems of easy agglomeration, single shape, and difficult industrial production, and achieve the effects of mild reaction conditions, short reaction time, and low production cost

Inactive Publication Date: 2010-12-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation methods of nanoparticles are divided into solid-phase method and liquid-phase method. The large-scale production of nanoparticles can be realized through the solid-phase method, but the particle size is large (>10nm), easy to agglomerate, and the shape is single, and the nano-effect is difficult. It is completely reflected; through the liquid phase method, nanoparticles with small particle size (<10nm) and various shapes can be obtained, but solid-liquid separation is difficult, and the usual methods such as centrifugation and evaporation are difficult to achieve industrial production. The development of nanomaterials has been restricted serious hindrance

Method used

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  • Original ecology separation and redispersion method of nano metallic colloid
  • Original ecology separation and redispersion method of nano metallic colloid
  • Original ecology separation and redispersion method of nano metallic colloid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: 0.020g silver acetate, 0.04g dodecanoic acid, a certain amount of deionized water and ethylene glycol, and adjust the pH value to 9~10 with potassium hydroxide, gradually raise the temperature to 90~120°C, and quickly Add 0.025g of ascorbic acid, and keep stirring for 20-30 minutes, the solution turns brown-black, and stable nano-silver colloid can be obtained; adjust the pH value of the solution to 6-7 with hydrochloric acid, and flocculent precipitates appear, and Brinell The funnel is separated, washed and dried to obtain nano-silver powder;

Embodiment 2

[0029] Example 2: 0.35g silver laurate, 0.7g sodium citrate, a certain amount of deionized water and isopropanol, and adjust the pH value to 9~10 with sodium hydroxide, and gradually heat up to 90~120°C for several minutes Add 0.05 g of hydrazine hydrate quickly, and continue to stir for 20 to 30 minutes. After the reaction, the solution turns brownish black, and stable nano-silver colloid can be obtained; adjust the pH value of the solution to 6 to 7 with sodium bisulfate, and flocculation occurs. Precipitate, separated by Buchner funnel, washed and dried to obtain nano-silver powder;

Embodiment 3

[0030] Example 3: 0.52g silver nitrate, 0.87g polyvinyl alcohol, a certain amount of deionized water, and adjust the pH value to 9~10 with sodium bicarbonate, gradually heat up to 90~120°C, and add hydration rapidly after a few minutes Hydrazine 0.07g and after 20-30 minutes of continuous stirring reaction, the solution turns brownish black, and stable nano-silver colloid can be obtained; the pH value of the solution is adjusted to 6-7 with phosphoric acid, and flocculent precipitation occurs, and the Buchner funnel separates, After washing and drying, nano-silver powder can be obtained; take some obtained nano-silver powder and disperse it directly in xylene, and ultrasonically disperse for several minutes to obtain yellow-green nano-silver colloid.

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Abstract

The invention belongs to the technical field of nano, in particular to an original ecology separation and redispersion method of a nano metallic colloid. By taking spherical nano silver as an example, the method comprises the following steps: stirring and reacting silver salts under the existence of an organic protective agent and a reducing agent to obtain a nano silver colloid; adjusting the pH value of the nano silver colloid with acid, and continuously stirring and reacting until the colloid solution gradually appears flocks to obtain nano silver particles; and dispersing the nano silver particles in an organic solvent, and dispersing by ultrasonic to obtain the nano silver colloid dispersed in an original ecology mode. The invention can realize original ecology separation and redispersion repeatedly based on the interactive relationship among a dispersing agent, nano particles and the solution. The invention has the advantages of simple process, mild operation condition, short reaction time, little changes in particle size and appearance after repeated separation and dispersion, low preparation cost and no generation of harmful waste, and conforms to the requirement of green production.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for the original separation and redispersion of nanometer metal colloids. And taking spherical nano silver as an example, it is prepared by liquid phase method, and the method of separating and redispersing small particle size (<10nm) nano silver particles in the original ecology. Background technique [0002] Nanoparticles belong to the transition region between atomic clusters and macroscopic bodies, and are aggregates composed of many atoms or molecules. This structure determines that it has many special physical and chemical properties that traditional materials do not have, such as macroscopic quantum tunneling effect, quantum size effect, surface and interface effect, small size effect, and light, electricity, magnetism, thermal and other characteristics. Since the 1980s, nanotechnology has developed rapidly, and nanotechnology will als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 杨振国邰艳龙
Owner FUDAN UNIV
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