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A method and device for preparing nanoparticles

A nanoparticle and erosion technology, applied in the field of nanomaterials, can solve the problem of high energy consumption, achieve the effect of improving the processing speed of ball milling and solving the effect of uneven particle size distribution

Active Publication Date: 2018-10-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when coupled with the high-energy ball milling process, the spark discharge process does not need to be as harsh as the preparation of nanoparticles. The use of high current, large pulse width, and numerical control feeding can achieve rapid erosion of bulk materials and efficient preparation of micron or Submicron particle material, the speed is more than 100 times the speed of preparing nanoparticles by a single spark discharge process. Such high-speed pretreatment can also greatly save the time-consuming shortcomings of the traditional classification ball milling process, and this pretreatment method can also be Solve the problem of high energy consumption of large particles in traditional multi-stage ball milling, and the overall energy consumption is far less than that required by a single ball milling process, and can quickly prepare workpieces of specific materials into nanoparticles

Method used

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  • A method and device for preparing nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0055] The structure of a coupling processing device for EDM and high energy ball milling provided by the present invention is as follows: figure 1 and figure 2 shown. A device for preparing micron or submicron particles by spark discharge technology, fixing the working fluid tank 3 on the displacement platform 7, fixing the workpiece electrode 6 in the working fluid tank 3, and realizing the feeding of the workpiece electrode 6 through the numerical control system 2, and the workpiece electrode 6 pass the positive pole of the pulse power supply 1, the tool electrode 4 passes the negative pole of the pulse power supply 1, and the tool electrode 4 is tubular; add the working fluid 5 into the working fluid tank 3, and dip into the gap between the workpiece electrode 6 and the tool electrode 4. A continuous pulsed spark discharge is formed between the tool electrode 4 and the workpiece electrode 6, and the surface of the material is melted and vaporized by the high temperature ...

Embodiment 2

[0069] Such as figure 1 , figure 2 As shown, the device for preparing micron or submicron particles by spark discharge process and the device for preparing micron or submicron particles into nanoparticles by high energy ball milling process are different from Example 1 in that the workpiece material is non-conductive intrinsic silicon, and the working The solution is 10% Na 2 CO 3 solution, the working fluid conducts electricity and acts as an auxiliary electrode.

[0070] The silicon nanoparticles prepared in this example have a purity of 91% as measured by X-ray fluorescence spectrometry (XRF); the particle size D50=80nm is analyzed by a laser particle size analyzer.

Embodiment 3

[0072] Such as figure 1 , figure 2 As shown, the device for preparing micron or submicron particles by spark discharge process and the device for preparing micron or submicron particles into nanoparticles by high energy ball milling process are different from Example 1 in that the grinding aid of ball milling is absolute ethanol, and the ball milling The time is 20h.

[0073] The silicon nanoparticles prepared in this example have a purity of 97% as measured by X-ray fluorescence spectrometry (XRF); the particle size D50=60nm is analyzed by a laser particle size analyzer.

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Abstract

The invention discloses a method and a device for preparing nanoparticles, belonging to the field of nanomaterial preparation. The method of this patent is to melt or gasify the material in a local extremely small area of ​​the workpiece to be processed in a condensing environment, so that the melted or gasified product is rapidly condensed to form loose micron or nano particles, forming corrosion. Remove the product (such as electric discharge machining), and then send the erosion product to the high-energy ball mill for processing. The material produced by the melting or gasification of the local extremely small area has an extremely loose structure after rapid condensation, which is especially suitable for For ball milling, on the one hand, this treatment method can quickly form micro-nano particles of the materials to be processed, on the other hand, it ensures the loose structure of the microspheres, and the speed of ball milling processing has been significantly improved. This processing method can conveniently obtain loose micro-nano particles from specific bulk materials, which greatly speeds up the ball milling speed.

Description

technical field [0001] The invention relates to a method and a device for preparing nanoparticles, which belong to the field of nanomaterials. Background technique [0002] Because nanoparticles have small size effect, surface and interface effect, quantum effect, macroscopic quantum tunnel effect and catalytic effect. Therefore, it has specific functions in terms of catalytic properties, optical properties, magnetic properties, enhanced toughening properties, hydrogen storage properties, and lubricating properties, and thus has been widely used. Mainly used in: catalysts, nanoelectronic devices, sensors, magnetic materials, optical and stealth materials, reinforced and toughened materials, and biomedical materials. In terms of reinforced and toughened materials, there are nanoparticle-reinforced and toughened materials, nano-whiskers, fiber-reinforced materials, nanoparticle-assisted sintering materials, and nano-welding technology. [0003] The preparation of nanomateria...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C17/10B02C17/16
CPCB02C17/10B02C17/16
Inventor 赵明才汪炜曹祥威孙洪凯
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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