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Salt-shelled nano compound particles and preparation method thereof

A nano-compound and particle technology, which is applied in the preparation of alumina/hydroxide, aluminum compounds, chemical instruments and methods, etc., can solve the problems of coarse salt particles, difficult to control the crystallization process of soluble salt, and inability to isolate nanoparticles. , to achieve the effect of improving crystallinity, maintaining monodispersity, and low equipment requirements

Active Publication Date: 2016-10-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems to be solved when using the isolation phase method: first, it is necessary to find an isolation substance that does not chemically react with nanoparticles at high temperature and can be completely removed in the later stage; second, it is necessary to use an isolation phase to disperse and isolate nanoparticles
Soluble salts with high melting points such as chlorides and sulfates are chemically stable and easy to remove by washing, but the crystallization process of soluble salts is difficult to control, and the salt particles are coarse, so they cannot be used to isolate fine nanoparticles
[0006] In summary, none of the existing technologies can avoid the sintering between nanoparticles during the high-temperature calcination process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 0.001 mol of potassium sulfate, and prepare 10 ml of potassium sulfate solution with deionized water; take 0.005 mol of γ-phase nano-alumina, add it to the potassium sulfate solution, and disperse it ultrasonically to make a suspension; 30 ml of oxyethylene ether, 70 ml of cyclohexane, mix the suspension with octylphenyl polyoxyethylene ether and cyclohexane, stir, and ultrasonically disperse into a water-in-oil microemulsion; add acetone, stir, and centrifuge , to obtain nanometer γ-alumina particles with salt shells. The particles are dried and calcined at 1000°C. After cooling, the potassium sulfate salt is washed off with deionized water. After drying, monodisperse α-alumina can be obtained.

Embodiment 2

[0031] Take 0.001 mol of sodium sulfate and prepare 10 ml of sodium sulfate solution with deionized water; take 0.005 mol of nano-aluminum hydroxide, add it to the sodium sulfate solution, and disperse it ultrasonically to make a suspension; measure octylphenylpolyoxygen Vinyl ether 30 ml, cyclohexane 70 ml, the suspension was mixed with octylphenyl polyoxyethylene ether and cyclohexane, stirred, and ultrasonically dispersed into a water-in-oil microemulsion; acetone was added and stirred, centrifuged, Nano aluminum hydroxide particles with salt shells are obtained. The particles are dried and calcined at 800°C, aluminum hydroxide is decomposed to obtain alumina, after cooling, the sodium sulfate salt is washed off with deionized water, and monodisperse nano-alumina can be obtained after drying.

Embodiment 3

[0033] Take 0.001 mol of sodium chloride and prepare 10 ml of sodium chloride solution with deionized water; take 0.005 mol of nano-aluminum ammonium carbonate, add it to the sodium chloride solution, and disperse it ultrasonically to make a suspension; measure octylbenzene 30 ml of polyoxyethylene ether, 70 ml of cyclohexane, mix the suspension with octylphenyl polyoxyethylene ether and cyclohexane, stir, and ultrasonically disperse into a water-in-oil microemulsion; add acetone and stir and centrifuging to obtain nanometer ammonium aluminum carbonate particles with salt shells. The particles are dried and calcined at 750°C, the ammonium aluminum carbonate is decomposed to obtain alumina, after cooling, the sodium chloride salt is washed off with deionized water, and monodisperse nano-alumina can be obtained after drying.

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PUM

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Abstract

The invention discloses a method for preparing salt-shelled nano compound particles, comprising: dispersing nano compound particles in a soluble salt solution, mixing cyclohexane and octyl phenol polyethylene ether according to a certain ratio to prepare water-in-oil microemulsion, and demulsifying, centrifuging and drying the microemulsion to obtain the nano compound particles with surface soluble salt shells. The particles coated with soluble salt shells may be calcined at salt melting point and may be washed with water to obtain high-crystallinity disperse nano particles. The method greatly broadens a temperature range for preparing diverse nano materials, preventing the nano particles from being sintered at a high temperature.

Description

technical field [0001] The invention belongs to the field of nano material preparation and relates to a method for preparing nano compound particles with salt shells. Background technique [0002] Nanopowder is also called nanoparticle, which generally refers to ultrafine particles with a size between 1-100nm. Due to the surface effect, quantum size effect, volume effect and macroscopic quantum tunneling effect, nanoparticles have good thermal, optical, electrical, magnetic and chemical properties, so they are widely used in electronics, chemical industry, machinery, biomedicine and other fields . [0003] One of the difficult problems in the preparation of nanopowders is the agglomeration of particles. Due to the small particle size and large surface energy of nanoparticles, they are in a state of energy instability, and fine particles tend to aggregate together. Under the action of surface hydrogen bonds and chemical bonds, nanoparticles will undergo irreversible hard a...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/30B82Y30/00
CPCB82Y30/00C01F7/021C01F7/026C01F7/30C01P2004/64
Inventor 董岩宋立邵起越蒋建清
Owner SOUTHEAST UNIV
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