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Method for separating nano particles of different particle sizes

A nanoparticle and particle size technology, applied in the field of separation, can solve problems such as poor selectivity, difficult selection of surfactants, unpredictable particle size of nanoparticles, etc.

Active Publication Date: 2016-01-13
河南索顿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The selectivity of this method is not strong, the particle size of the extracted nanoparticles is unpredictable, and the surfactant is also difficult to choose

Method used

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  • Method for separating nano particles of different particle sizes
  • Method for separating nano particles of different particle sizes
  • Method for separating nano particles of different particle sizes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) 0.2639g (weighed by an analytical balance) of nano-tantalum powder (measured by the method of (1)) has a particle size of 61.1-306.6nm, and its particle size diagram is as follows figure 1 shown) in 50mL of ethylene glycol, fully dispersed in an ultrasonic machine for 30 minutes, and then put the dispersed mixture into a centrifuge tube;

[0063] (2) Centrifuge for 30 minutes at a speed of 1000 rpm;

[0064] (3) Remove the supernatant liquid from the separation system, wash the sediment obtained by centrifugation with absolute ethanol three times, vacuum-dry it at 40°C for 1 hour, and then ultrasonically disperse it in absolute ethanol, then use the method (1) to measure The particle size of the sediment is 240.7~303.6nm, the particle size diagram is as follows figure 2 shown;

[0065] (4) The supernatant liquid continues to be centrifuged at 1500rpm, 2000rpm and 2500rpm respectively for 30 minutes, repeating the operations of steps 2 to 3 above until the superna...

Embodiment 2

[0071] (1) Disperse 0.3998g (weighed by an analytical balance) of nano-tantalum powder (the particle diameter is 60.1 to 310.6nm as measured by method (1)) in 50mL of n-decyl alcohol, fully disperse in an ultrasonic machine for 30 minutes, Then put the dispersed mixed solution in a centrifuge tube;

[0072] (2) Centrifuge for 40 minutes under the condition of 800 rpm;

[0073] (3) Remove the supernatant from the separation system, wash the sediment obtained by centrifugation with absolute ethanol three times, vacuum-dry it at 40°C for 1 hour, and then ultrasonically disperse it in absolute ethanol, then use the method (1) to measure The particle size of the sediment is 250-310nm;

[0074] (4) The supernatant liquid continues to be centrifuged for 40 minutes under the condition of rotating speed of 1300rpm, 1800rpm and 2300rpm respectively, and the operation of steps 2 to 3 above is repeated until the supernatant liquid is clarified, that is, the minimum particle size of the p...

Embodiment 3

[0079] (1) Disperse 0.1325g (weighed by an analytical balance) of nano-tantalum powder (the particle size is 20.5-400.3nm measured by the method (1)) in 50mL ethanol-glycerol composite solvent (viscosity is 100mPa.S) , fully disperse in an ultrasonic machine for 30 minutes, and then put the dispersed mixture into a centrifuge tube;

[0080] (2) Centrifuge for 20 minutes under the condition of 1200rpm at a rotating speed;

[0081] (3) Remove the supernatant from the separation system, wash the sediment obtained by centrifugation with absolute ethanol three times, vacuum-dry it at 40°C for 1 hour, and then ultrasonically disperse it in absolute ethanol, then use the method (1) to measure The particle size of the sediment is 150-200nm;

[0082] (4) The supernatant liquid continues to be centrifuged at 1700rpm, 2200rpm and 2700rpm respectively for 20 minutes, and repeats the operations of steps 2 to 3 above until the supernatant is clarified, that is, the minimum particle size of...

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Abstract

The invention provides a method for separating nano particles of different particle sizes. According to the method, nano powder is fully dispersed into solvent of certain viscosity, and the nano particles which are of different particle sizes and are narrow in particle size distribution range can be obtained under the centrifugal effect at different rotation speeds. The method is convenient and easy to implement, the operation is easy, the nano powder which is narrow in particle size distribution range can be obtained without adjusting the density of the solvent in a mixed system, and the success rate of separation is high.

Description

technical field [0001] The invention relates to a separation method, in particular to a method for separating nanoparticles with different particle sizes. Background technique [0002] Nanoparticles are artificially produced microscopic particles with a size of no more than 100 nanometers. It may be emulsions, polymers, ceramic particles, metal particles and carbon particles, which are increasingly used in medicine, sunscreen cosmetics, etc. [0003] Nanoparticles are of great scientific value because they bridge the bulk of matter with atoms and molecules. The physical properties of bulk matter are usually size-independent, but at the nanoscale this is generally not the case. [0004] Nanoparticles have special physical effects, thermal properties, magnetic properties, optical properties, etc., such as quantum size effect, small size effect, surface effect, macroscopic quantum tunneling effect, Coulomb blockage and quantum tunneling effect, dielectric confinement effect, ...

Claims

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Application Information

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IPC IPC(8): B03B5/32
Inventor 陶栋梁
Owner 河南索顿新材料有限公司
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